MAX4187EEE-T中文资料

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MAX471MAX472的中文资料大全

M A X471M A X472的中文资料大全(总4页)-本页仅作为预览文档封面，使用时请删除本页-MAX471/MAX472的特点、功能美国美信公司生产的精密高端电流检测放大器是一个系列化产品，有MAX471/MA X472、 MAX4172/MAX4173等。

它们均有一个电流输出端，可以用一个电阻来简单地实现以地为参考点的电流/电压的转换，并可工作在较宽电压内。

MAX471/MAX472具有如下特点：●具有完美的高端电流检测功能；●内含精密的内部检测电阻（MAX471）；●在工作温度范围内，其精度为2%；●具有双向检测指示，可监控充电和放电状态；●内部检测电阻和检测能力为3A，并联使用时还可扩大检测电流范围；●使用外部检测电阻可任意扩展检测电流范围（MAX472）；●最大电源电流为100μA；●关闭方式时的电流仅为5μA；●电压范围为3～36V；●采用8脚DIP/SO/STO三种封装形式。

MAX471/MAX472的引脚排列如图1所示，图2所示为其内部功能框图。

表1为MAX471/MAX472的引脚功能说明。

MAX471的电流增益比已预设为500μA/A，由于2kΩ的输出电阻（ROUT）可产生1V/A的转换，因此±3A时的满度值为3V.用不同的ROUT电阻可设置不同的满度电压。

但对于MAX471，其输出电压不应大于VRS+。

对于MAX472，则不能大于。

MAX471引脚图如图１所示，MAX472引脚图如图２所示。

MAX471/MAX472的引脚功能说明引脚名称功能MAX471MAX47211SHDN关闭端。

正常运用时连接到地。

当此端接高电平时，电源电流小于5μA2，3-RS+内部电流检测电阻电池（或电源端）。

“+”仅指示与SIGN输出有关的流动方向。

封装时已将2和3连在了一起-2空脚-3RG1增益电阻端。

通过增益设置电阻连接到电流检测电阻的电池端44GND地或电池负端55SIGN集电极开路逻辑输出端。

MAX13085EESA-T中文资料

General DescriptionThe MAX13080E–MAX13089E +5.0V, ±15kV ESD-protect-ed, RS-485/RS-422 transceivers feature one driver and one receiver. These devices include fail-safe circuitry,guaranteeing a logic-high receiver output when receiver inputs are open or shorted. The receiver outputs a logic-high if all transmitters on a terminated bus are disabled (high impedance). The MAX13080E–MAX13089E include a hot-swap capability to eliminate false transitions on the bus during power-up or hot insertion.The MAX13080E/MAX13081E/MAX13082E feature reduced slew-rate drivers that minimize EMI and reduce reflections caused by improperly terminated cables, allowing error-free data transmission up to 250kbps. The MAX13083E/MAX13084E/MAX13085E also feature slew-rate-limited drivers but allow transmit speeds up to 500kbps. The MAX13086E/MAX13087E/MAX13088E driver slew rates are not limited, making transmit speeds up to 16Mbps possible. The MAX13089E slew rate is pin selectable for 250kbps,500kbps, and 16Mbps.The MAX13082E/MAX13085E/MAX13088E are intended for half-duplex communications, and the MAX13080E/MAX13081E/MAX13083E/MAX13084E/MAX13086E/MAX13087E are intended for full-duplex communica-tions. The MAX13089E is selectable for half-duplex or full-duplex operation. It also features independently programmable receiver and transmitter output phase through separate pins.The MAX13080E–MAX13089E transceivers draw 1.2mA of supply current when unloaded or when fully loaded with the drivers disabled. All devices have a 1/8-unit load receiver input impedance, allowing up to 256transceivers on the bus.The MAX13080E/MAX13083E/MAX13086E/MAX13089E are available in 14-pin PDIP and 14-pin SO packages.The MAX13081E/MAX13082E/MAX13084E/MAX13085E/MAX13087E/MAX13088E are available in 8-pin PDIP and 8-pin SO packages. The devices operate over the com-mercial, extended, and automotive temperature ranges.ApplicationsUtility Meters Lighting Systems Industrial Control Telecom Security Systems Instrumentation ProfibusFeatures♦+5.0V Operation♦Extended ESD Protection for RS-485/RS-422 I/O Pins±15kV Human Body Model ♦True Fail-Safe Receiver While Maintaining EIA/TIA-485 Compatibility ♦Hot-Swap Input Structures on DE and RE ♦Enhanced Slew-Rate Limiting Facilitates Error-Free Data Transmission(MAX13080E–MAX13085E/MAX13089E)♦Low-Current Shutdown Mode (Except MAX13081E/MAX13084E/MAX13087E)♦Pin-Selectable Full-/Half-Duplex Operation (MAX13089E)♦Phase Controls to Correct for Twisted-Pair Reversal (MAX13089E)♦Allow Up to 256 Transceivers on the Bus ♦Available in Industry-Standard 8-Pin SO PackageMAX13080E–MAX13089E+5.0V , ±15kV ESD-Protected, Fail-Safe, Hot-Swap, RS-485/RS-422 Transceivers________________________________________________________________Maxim Integrated Products 1Ordering Information19-3590; Rev 1; 4/05For pricing, delivery, and ordering information,please contact Maxim/Dallas Direct!at 1-888-629-4642, or visit Maxim’s website at .Selector Guide, Pin Configurations, and Typical Operating Circuits appear at end of data sheet.Ordering Information continued at end of data sheet.M A X 13080E –M A X 13089E+5.0V , ±15kV ESD-Protected, Fail-Safe, Hot-Swap, RS-485/RS-422 Transceivers 2_______________________________________________________________________________________ABSOLUTE MAXIMUM RATINGSDC ELECTRICAL CHARACTERISTICS(V CC = +5.0V ±10%, T A = T MIN to T MAX , unless otherwise noted. Typical values are at V CC = +5.0V and T A = +25°C.) (Note 1)Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.(All Voltages Referenced to GND)Supply Voltage (V CC ).............................................................+6V Control Input Voltage (RE , DE, SLR,H/F , TXP, RXP)......................................................-0.3V to +6V Driver Input Voltage (DI)...........................................-0.3V to +6V Driver Output Voltage (Z, Y, A, B).............................-8V to +13V Receiver Input Voltage (A, B)....................................-8V to +13V Receiver Input VoltageFull Duplex (A, B)..................................................-8V to +13V Receiver Output Voltage (RO)....................-0.3V to (V CC + 0.3V)Driver Output Current.....................................................±250mAContinuous Power Dissipation (T A = +70°C)8-Pin SO (derate 5.88mW/°C above +70°C).................471mW 8-Pin Plastic DIP (derate 9.09mW/°C above +70°C).....727mW 14-Pin SO (derate 8.33mW/°C above +70°C)...............667mW 14-Pin Plastic DIP (derate 10.0mW/°C above +70°C)...800mW Operating Temperature RangesMAX1308_EC_ _.................................................0°C to +75°C MAX1308_EE_ _..............................................-40°C to +85°C MAX1308_EA_ _............................................-40°C to +125°C Junction Temperature......................................................+150°C Storage Temperature Range.............................-65°C to +150°C Lead Temperature (soldering, 10s).................................+300°CMAX13080E–MAX13089E+5.0V , ±15kV ESD-Protected, Fail-Safe, Hot-Swap, RS-485/RS-422 Transceivers_______________________________________________________________________________________3DC ELECTRICAL CHARACTERISTICS (continued)(V CC = +5.0V ±10%, T A = T MIN to T MAX , unless otherwise noted. Typical values are at V CC = +5.0V and T A = +25°C.) (Note 1)M A X 13080E –M A X 13089E+5.0V , ±15kV ESD-Protected, Fail-Safe, Hot-Swap, RS-485/RS-422 Transceivers 4_______________________________________________________________________________________DRIVER SWITCHING CHARACTERISTICSMAX13080E/MAX13081E/MAX13082E/MAX13089E WITH SRL = UNCONNECTED (250kbps)(V CC = +5.0V ±10%, T A = T MIN to T MAX , unless otherwise noted. Typical values are at V CC = +5.0V and T A = +25°C.)RECEIVER SWITCHING CHARACTERISTICSMAX13080E/MAX13081E/MAX13082E/MAX13089E WITH SRL = UNCONNECTED (250kbps)(V CC = +5.0V ±10%, T A = T MIN to T MAX , unless otherwise noted. Typical values are at V CC = +5.0V and T A = +25°C.)MAX13080E–MAX13089E+5.0V , ±15kV ESD-Protected, Fail-Safe, Hot-Swap, RS-485/RS-422 Transceivers_______________________________________________________________________________________5DRIVER SWITCHING CHARACTERISTICSMAX13083E/MAX13084E/MAX13085E/MAX13089E WITH SRL = V CC (500kbps)(V CC = +5.0V ±10%, T A = T MIN to T MAX , unless otherwise noted. Typical values are at V CC = +5.0V and T A = +25°C.)RECEIVER SWITCHING CHARACTERISTICSMAX13083E/MAX13084E/MAX13085E/MAX13089E WITH SRL = V CC (500kbps)(V CC = +5.0V ±10%, T A = T MIN to T MAX , unless otherwise noted. Typical values are at V CC = +5.0V and T A = +25°C.)M A X 13080E –M A X 13089E+5.0V , ±15kV ESD-Protected, Fail-Safe, Hot-Swap, RS-485/RS-422 Transceivers 6_______________________________________________________________________________________DRIVER SWITCHING CHARACTERISTICSMAX13086E/MAX13087E/MAX13088E/MAX13089E WITH SRL = GND (16Mbps)(V CC = +5.0V ±10%, T A = T MIN to T MAX , unless otherwise noted. Typical values are at V CC = +5.0V and T A = +25°C.)RECEIVER SWITCHING CHARACTERISTICSMAX13086E/MAX13087E/MAX13088E/MAX13089E WITH SRL = GND (16Mbps)(V CC = +5.0V ±10%, T A = T MIN to T MAX , unless otherwise noted. Typical values are at V CC = +5.0V and T A = +25°C.)Note 2:∆V OD and ∆V OC are the changes in V OD and V OC , respectively, when the DI input changes state.Note 3:The short-circuit output current applies to peak current just prior to foldback current limiting. The short-circuit foldback outputcurrent applies during current limiting to allow a recovery from bus contention.MAX13080E–MAX13089E+5.0V , ±15kV ESD-Protected, Fail-Safe, Hot-Swap, RS-485/RS-422 Transceivers_______________________________________________________________________________________70.800.901.501.101.001.201.301.401.60-40-10520-253550958011065125SUPPLY CURRENT vs. TEMPERATURETEMPERATURE (°C)S U P P L Y C U R R E N T (m A )0201040305060021345OUTPUT CURRENTvs. RECEIVER OUTPUT-HIGH VOLTAGEM A X 13080E -89E t o c 02OUTPUT HIGH VOLTAGE (V)O U T P U T C U R R E N T (m A )20104030605070021345OUTPUT CURRENTvs. RECEIVER OUTPUT-LOW VOLTAGEM A X 13080E -89E t o c 03OUTPUT LOW VOLTAGE (V)O U T P U T C U R R E N T (m A )4.04.44.24.84.65.25.05.4RECEIVER OUTPUT-HIGH VOLTAGEvs. TEMPERATURETEMPERATURE (°C)O U T P U T H I G H V O L T A G E (V )-40-10520-2535509580110651250.10.70.30.20.40.50.60.8RECEIVER OUTPUT-LOW VOLTAGEvs. TEMPERATURETEMPERATURE (°C)O U T P U T L O W V O L T A G E (V )-40-10520-25355095801106512502040608010012014016012345DRIVER DIFFERENTIAL OUTPUT CURRENT vs. DIFFERENTIAL OUTPUT VOLTAGEDIFFERENTIAL OUTPUT VOLTAGE (V)D I F FE R E N T I A L O U T P U T C U R R E N T (m A )2.02.82.43.63.24.44.04.8DRIVER DIFFERENTIAL OUTPUT VOLTAGE vs. TEMPERATURED I F FE R E N T I A L O U T P U T V O L T A G E (V )-40-10520-253550958011065125TEMPERATURE (°C)40201008060120140180160200-7-5-4-6-3-2-1012354OUTPUT CURRENT vs. TRANSMITTEROUTPUT-HIGH VOLTAGEOUTPUT HIGH VOLTAGE (V)O U T P U T C U R R E N T (m A )60402080100120140160180200042681012OUTPUT CURRENT vs. TRANSMITTEROUTPUT-LOW VOLTAGEOUTPUT-LOW VOLTAGE (V)O U T P U T C U R R E N T (m A )Typical Operating Characteristics(V CC = +5.0V, T A = +25°C, unless otherwise noted.)M A X 13080E –M A X 13089E+5.0V , ±15kV ESD-Protected, Fail-Safe, Hot-Swap, RS-485/RS-422 Transceivers 8_______________________________________________________________________________________21543679810SHUTDOWN CURRENT vs. TEMPERATUREM A X 13080E -89E t o c 10S H U T D O W N C U R R E N T (µA )-40-10520-253550958011065125TEMPERATURE (°C)600800700100090011001200DRIVER PROPAGATION DELAY vs. TEMPERATURE (250kbps)D R I VE R P R O P A G A T I O N D E L A Y (n s )-40-10520-253550958011065125TEMPERATURE (°C)300400350500450550600DRIVER PROPAGATION DELAY vs. TEMPERATURE (500kbps)D R I VE R P R O P A G A T I O N D E L A Y (n s )-40-10520-253550958011065125TEMPERATURE (°C)1070302040506080DRIVER PROPAGATION DELAY vs. TEMPERATURE (16Mbps)D R I VE R P R O P A G A T I O N D E L A Y (n s )-40-10520-253550958011065125TEMPERATURE (°C)40201008060120140160180RECEIVER PROPAGATION DELAYvs. TEMPERATURE (250kpbs AND 500kbps)R E C E I V E R P R O P A G A T I O N D E L A Y (n s )-40-10520-253550958011065125TEMPERATURE (°C)40201008060120140160180RECEIVER PROPAGATION DELAYvs. TEMPERATURE (16Mbps)R EC E I V E R P R O P A G AT I O N D E L A Y (n s )-40-10520-253550958011065125TEMPERATURE (°C)2µs/div DRIVER PROPAGATION DELAY (250kbps)DI 2V/divV Y - V Z 5V/divR L = 100Ω200ns/divRECEIVER PROPAGATION DELAY(250kbps AND 500kbps)V A - V B 5V/divRO 2V/divTypical Operating Characteristics (continued)(V CC = +5.0V, T A = +25°C, unless otherwise noted.)MAX13080E–MAX13089E+5.0V , ±15kV ESD-Protected, Fail-Safe, Hot-Swap, RS-485/RS-422 Transceivers_______________________________________________________________________________________9Test Circuits and Waveforms400ns/divDRIVER PROPAGATION DELAY (500kbps)DI 2V/divR L = 100ΩV Y - V Z 5V/div10ns/div DRIVER PROPAGATION DELAY (16Mbps)DI 2V/divR L = 100ΩV Y 2V/divV Z 2V/div40ns/divRECEIVER PROPAGATION DELAY (16Mbps)V B 2V/divR L = 100ΩRO 2V/divV A 2V/divTypical Operating Characteristics (continued)(V CC = +5.0V, T A = +25°C, unless otherwise noted.)Figure 2. Driver Timing Test CircuitM A X 13080E –M A X 13089E+5.0V , ±15kV ESD-Protected, Fail-Safe, Hot-Swap, RS-485/RS-422 Transceivers 10______________________________________________________________________________________Test Circuits and Waveforms (continued)Figure 4. Driver Enable and Disable Times (t DHZ , t DZH , t DZH(SHDN))DZL DLZ DLZ(SHDN)MAX13080E–MAX13089E+5.0V , ±15kV ESD-Protected, Fail-Safe, Hot-Swap, RS-485/RS-422 TransceiversTest Circuits and Waveforms (continued)Figure 6. Receiver Propagation Delay Test CircuitM A X 13080E –M A X 13089E+5.0V , ±15kV ESD-Protected, Fail-Safe, Hot-Swap, RS-485/RS-422 TransceiversMAX13080E–MAX13089E+5.0V , ±15kV ESD-Protected, Fail-Safe, Hot-Swap, RS-485/RS-422 TransceiversMAX13080E/MAX13083E/MAX13086EMAX13081E/MAX13084E/MAX13086E/MAX13087EFunction TablesM A X 13080E –M A X 13089E+5.0V , ±15kV ESD-Protected, Fail-Safe, Hot-Swap, RS-485/RS-422 Transceivers MAX13082E/MAX13085E/MAX13088EFunction Tables (continued)MAX13089EDetailed Description The MAX13080E–MAX13089E high-speed transceivers for RS-485/RS-422 communication contain one driver and one receiver. These devices feature fail-safe circuit-ry, which guarantees a logic-high receiver output when the receiver inputs are open or shorted, or when they are connected to a terminated transmission line with all dri-vers disabled (see the Fail-Safe section). The MAX13080E/MAX13082E/MAX13083E/MAX13085E/ MAX13086E/MAX13088E/MAX13089E also feature a hot-swap capability allowing line insertion without erroneous data transfer (see the Hot Swap Capability section). The MAX13080E/MAX13081E/MAX13082E feature reduced slew-rate drivers that minimize EMI and reduce reflec-tions caused by improperly terminated cables, allowing error-free data transmission up to 250kbps. The MAX13083E/MAX13084E/MAX13085E also offer slew-rate limits allowing transmit speeds up to 500kbps. The MAX13086E/MAX13087E/MAX13088Es’ driver slew rates are not limited, making transmit speeds up to 16Mbps possible. The MAX13089E’s slew rate is selectable between 250kbps, 500kbps, and 16Mbps by driving a selector pin with a three-state driver.The MAX13082E/MAX13085E/MAX13088E are half-duplex transceivers, while the MAX13080E/MAX13081E/ MAX13083E/MAX13084E/MAX13086E/MAX13087E are full-duplex transceivers. The MAX13089E is selectable between half- and full-duplex communication by driving a selector pin (H/F) high or low, respectively.All devices operate from a single +5.0V supply. Drivers are output short-circuit current limited. Thermal-shutdown circuitry protects drivers against excessive power dissi-pation. When activated, the thermal-shutdown circuitry places the driver outputs into a high-impedance state.Receiver Input Filtering The receivers of the MAX13080E–MAX13085E, and the MAX13089E when operating in 250kbps or 500kbps mode, incorporate input filtering in addition to input hysteresis. This filtering enhances noise immunity with differential signals that have very slow rise and fall times. Receiver propagation delay increases by 25% due to this filtering.Fail-Safe The MAX13080E family guarantees a logic-high receiver output when the receiver inputs are shorted or open, or when they are connected to a terminated transmission line with all drivers disabled. This is done by setting the receiver input threshold between -50mV and -200mV. If the differential receiver input voltage (A - B) is greater than or equal to -50mV, RO is logic-high. If (A - B) is less than or equal to -200mV, RO is logic-low. In the case of a terminated bus with all transmitters disabled, the receiv-er’s differential input voltage is pulled to 0V by the termi-nation. With the receiver thresholds of the MAX13080E family, this results in a logic-high with a 50mV minimumnoise margin. Unlike previous fail-safe devices, the-50mV to -200mV threshold complies with the ±200mVEIA/TIA-485 standard.Hot-Swap Capability (Except MAX13081E/MAX13084E/MAX13087E)Hot-Swap InputsWhen circuit boards are inserted into a hot or powered backplane, differential disturbances to the data buscan lead to data errors. Upon initial circuit board inser-tion, the data communication processor undergoes itsown power-up sequence. During this period, the processor’s logic-output drivers are high impedanceand are unable to drive the DE and RE inputs of these devices to a defined logic level. Leakage currents up to±10µA from the high-impedance state of the proces-sor’s logic drivers could cause standard CMOS enableinputs of a transceiver to drift to an incorrect logic level. Additionally, parasitic circuit board capacitance couldcause coupling of V CC or GND to the enable inputs. Without the hot-swap capability, these factors could improperly enable the transceiver’s driver or receiver.When V CC rises, an internal pulldown circuit holds DElow and RE high. After the initial power-up sequence,the pulldown circuit becomes transparent, resetting thehot-swap tolerable input.Hot-Swap Input CircuitryThe enable inputs feature hot-swap capability. At theinput there are two NMOS devices, M1 and M2 (Figure 9). When V CC ramps from zero, an internal 7µstimer turns on M2 and sets the SR latch, which alsoturns on M1. Transistors M2, a 1.5mA current sink, andM1, a 500µA current sink, pull DE to GND through a5kΩresistor. M2 is designed to pull DE to the disabledstate against an external parasitic capacitance up to100pF that can drive DE high. After 7µs, the timer deactivates M2 while M1 remains on, holding DE low against three-state leakages that can drive DE high. M1 remains on until an external source overcomes the required input current. At this time, the SR latch resetsand M1 turns off. When M1 turns off, DE reverts to a standard, high-impedance CMOS input. Whenever V CCdrops below 1V, the hot-swap input is reset.For RE there is a complementary circuit employing two PMOS devices pulling RE to V CC. MAX13080E–MAX13089E+5.0V, ±15kV ESD-Protected, Fail-Safe, Hot-Swap, RS-485/RS-422 TransceiversM A X 13080E –M A X 13089EMAX13089E ProgrammingThe MAX13089E has several programmable operating modes. Transmitter rise and fall times are programma-ble, resulting in maximum data rates of 250kbps,500kbps, and 16Mbps. To select the desired data rate,drive SRL to one of three possible states by using a three-state driver: V CC , GND, or unconnected. F or 250kbps operation, set the three-state device in high-impedance mode or leave SRL unconnected. F or 500kbps operation, drive SRL high or connect it to V CC .F or 16Mbps operation, drive SRL low or connect it to GND. SRL can be changed during operation without interrupting data communications.Occasionally, twisted-pair lines are connected backward from normal orientation. The MAX13089E has two pins that invert the phase of the driver and the receiver to cor-rect this problem. F or normal operation, drive TXP and RXP low, connect them to ground, or leave them uncon-nected (internal pulldown). To invert the driver phase,drive TXP high or connect it to V CC . To invert the receiver phase, drive RXP high or connect it to V CC . Note that the receiver threshold is positive when RXP is high.The MAX13089E can operate in full- or half-duplex mode. Drive H/F low, leave it unconnected (internal pulldown), or connect it to GND for full-duplex opera-tion. Drive H/F high for half-duplex operation. In full-duplex mode, the pin configuration of the driver and receiver is the same as that of a MAX13080E. In half-duplex mode, the receiver inputs are internally connect-ed to the driver outputs through a resistor-divider. This effectively changes the function of the device’s outputs.Y becomes the noninverting driver output and receiver input, Z becomes the inverting driver output and receiver input. In half-duplex mode, A and B are still connected to ground through an internal resistor-divider but they are not internally connected to the receiver.±15kV ESD ProtectionAs with all Maxim devices, ESD-protection structures are incorporated on all pins to protect against electro-static discharges encountered during handling and assembly. The driver outputs and receiver inputs of the MAX13080E family of devices have extra protection against static electricity. Maxim’s engineers have devel-oped state-of-the-art structures to protect these pins against ESD of ±15kV without damage. The ESD struc-tures withstand high ESD in all states: normal operation,shutdown, and powered down. After an ESD event, the MAX13080E–MAX13089E keep working without latchup or damage.ESD protection can be tested in various ways. The transmitter outputs and receiver inputs of the MAX13080E–MAX13089E are characterized for protec-tion to the following limits:•±15kV using the Human Body Model•±6kV using the Contact Discharge method specified in IEC 61000-4-2ESD Test ConditionsESD performance depends on a variety of conditions.Contact Maxim for a reliability report that documents test setup, test methodology, and test results.Human Body ModelFigure 10a shows the Human Body Model, and Figure 10b shows the current waveform it generates when dis-charged into a low impedance. This model consists of a 100pF capacitor charged to the ESD voltage of interest,which is then discharged into the test device through a 1.5k Ωresistor.IEC 61000-4-2The IEC 61000-4-2 standard covers ESD testing and performance of finished equipment. However, it does not specifically refer to integrated circuits. The MAX13080E family of devices helps you design equip-ment to meet IEC 61000-4-2, without the need for addi-tional ESD-protection components.+5.0V , ±15kV ESD-Protected, Fail-Safe, Hot-Swap, RS-485/RS-422 TransceiversThe major difference between tests done using the Human Body Model and IEC 61000-4-2 is higher peak current in IEC 61000-4-2 because series resistance is lower in the IEC 61000-4-2 model. Hence, the ESD with-stand voltage measured to IEC 61000-4-2 is generally lower than that measured using the Human Body Model. Figure 10c shows the IEC 61000-4-2 model, and Figure 10d shows the current waveform for IEC 61000-4-2 ESD Contact Discharge test.Machine Model The machine model for ESD tests all pins using a 200pF storage capacitor and zero discharge resis-tance. The objective is to emulate the stress caused when I/O pins are contacted by handling equipment during test and assembly. Of course, all pins require this protection, not just RS-485 inputs and outputs.Applications Information256 Transceivers on the BusThe standard RS-485 receiver input impedance is 12kΩ(1-unit load), and the standard driver can drive up to 32-unit loads. The MAX13080E family of transceivers has a1/8-unit load receiver input impedance (96kΩ), allowingup to 256 transceivers to be connected in parallel on one communication line. Any combination of these devices,as well as other RS-485 transceivers with a total of 32-unit loads or fewer, can be connected to the line.Reduced EMI and ReflectionsThe MAX13080E/MAX13081E/MAX13082E feature reduced slew-rate drivers that minimize EMI and reduce reflections caused by improperly terminated cables, allowing error-free data transmission up to250kbps. The MAX13083E/MAX13084E/MAX13085Eoffer higher driver output slew-rate limits, allowing transmit speeds up to 500kbps. The MAX13089E withSRL = V CC or unconnected are slew-rate limited. WithSRL unconnected, the MAX13089E error-free data transmission is up to 250kbps. With SRL connected toV CC,the data transmit speeds up to 500kbps. MAX13080E–MAX13089E+5.0V, ±15kV ESD-Protected, Fail-Safe, Hot-Swap, RS-485/RS-422 TransceiversM A X 13080E –M A X 13089ELow-Power Shutdown Mode (Except MAX13081E/MAX13084E/MAX13087E)Low-power shutdown mode is initiated by bringing both RE high and DE low. In shutdown, the devices typically draw only 2.8µA of supply current.RE and DE can be driven simultaneously; the devices are guaranteed not to enter shutdown if RE is high and DE is low for less than 50ns. If the inputs are in this state for at least 700ns, the devices are guaranteed to enter shutdown.Enable times t ZH and t ZL (see the Switching Characteristics section) assume the devices were not in a low-power shutdown state. Enable times t ZH(SHDN)and t ZL(SHDN)assume the devices were in shutdown state. It takes drivers and receivers longer to become enabled from low-power shutdown mode (t ZH(SHDN), t ZL(SHDN))than from driver/receiver-disable mode (t ZH , t ZL ).Driver Output ProtectionTwo mechanisms prevent excessive output current and power dissipation caused by faults or by bus contention.The first, a foldback current limit on the output stage,provides immediate protection against short circuits over the whole common-mode voltage range (see the Typical Operating Characteristics ). The second, a thermal-shut-down circuit, forces the driver outputs into a high-imped-ance state if the die temperature exceeds +175°C (typ).Line LengthThe RS-485/RS-422 standard covers line lengths up to 4000ft. F or line lengths greater than 4000ft, use the repeater application shown in Figure 11.Typical ApplicationsThe MAX13082E/MAX13085E/MAX13088E/MAX13089E transceivers are designed for bidirectional data commu-nications on multipoint bus transmission lines. F igures 12 and 13 show typical network applications circuits. To minimize reflections, terminate the line at both ends in its characteristic impedance, and keep stub lengths off the main line as short as possible. The slew-rate-lim-ited MAX13082E/MAX13085E and the two modes of the MAX13089E are more tolerant of imperfect termination.Chip InformationTRANSISTOR COUNT: 1228PROCESS: BiCMOS+5.0V , ±15kV ESD-Protected, Fail-Safe, Hot-Swap, RS-485/RS-422 TransceiversFigure 11. Line Repeater for MAX13080E/MAX13081E/MAX13083E/MAX13084E/MAX13086E/MAX13087E/MAX13089E in Full-Duplex Mode+5.0V, ±15kV ESD-Protected, Fail-Safe, Hot-Swap, RS-485/RS-422 TransceiversMAX13080E–MAX13089EM A X 13080E –M A X 13089E+5.0V , ±15kV ESD-Protected, Fail-Safe, Hot-Swap, RS-485/RS-422 TransceiversPin Configurations and Typical Operating CircuitsMAX13080E–MAX13089E+5.0V , ±15kV ESD-Protected, Fail-Safe, Hot-Swap, RS-485/RS-422 Transceivers______________________________________________________________________________________21Pin Configurations and Typical Operating Circuits (continued)M A X 13080E –M A X 13089E+5.0V , ±15kV ESD-Protected, Fail-Safe, Hot-Swap, RS-485/RS-422 Transceivers 22______________________________________________________________________________________Ordering Information (continued)MAX13080E–MAX13089E+5.0V , ±15kV ESD-Protected, Fail-Safe, Hot-Swap, RS-485/RS-422 Transceivers______________________________________________________________________________________23Package Information (continued)(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information,go to /packages .)。

MAX3237EEAI+T中文资料

For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,or visit Maxim's website at .General DescriptionThe MAX3222E/MAX3232E/MAX3237E/MAX3241E/MAX3246E +3.0V-powered EIA/TIA-232 and V.28/V.24communications interface devices feature low power con-sumption, high data-rate capabilities, and enhanced electrostatic-discharge (ESD) protection. The enhanced ESD structure protects all transmitter outputs and receiver inputs to ±15kV using IEC 1000-4-2 Air-G ap Discharge, ±8kV using IEC 1000-4-2 Contact Discharge (±9kV for MAX3246E), and ±15kV using the Human Body Model. The logic and receiver I/O pins of the MAX3237E are protected to the above standards, while the transmit-ter output pins are protected to ±15kV using the Human Body Model.A proprietary low-dropout transmitter output stage delivers true RS-232 performance from a +3.0V to +5.5V power supply, using an internal dual charge pump. The charge pump requires only four small 0.1µF capacitors for opera-tion from a +3.3V supply. Each device guarantees opera-tion at data rates of 250kbps while maintaining RS-232output levels. The MAX3237E guarantees operation at 250kbps in the normal operating mode and 1Mbps in the MegaBaud™ operating mode, while maintaining RS-232-compliant output levels.The MAX3222E/MAX3232E have two receivers and two transmitters. The MAX3222E features a 1µA shutdown mode that reduces power consumption in battery-pow-ered portable systems. The MAX3222E receivers remain active in shutdown mode, allowing monitoring of external devices while consuming only 1µA of supply current. The MAX3222E and MAX3232E are pin, package, and func-tionally compatible with the industry-standard MAX242and MAX232, respectively.The MAX3241E/MAX3246E are complete serial ports (three drivers/five receivers) designed for notebook and subnotebook computers. The MAX3237E (five drivers/three receivers) is ideal for peripheral applications that require fast data transfer. These devices feature a shut-down mode in which all receivers remain active, while consuming only 1µA (MAX3241E/MAX3246E) or 10nA (MAX3237E).The MAX3222E, MAX3232E, and MAX3241E are avail-able in space-saving SO, SSOP, TQFN and TSSOP pack-ages. The MAX3237E is offered in an SSOP package.The MAX3246E is offered in the ultra-small 6 x 6 UCSP™package.ApplicationsBattery-Powered Equipment PrintersCell PhonesSmart Phones Cell-Phone Data Cables xDSL ModemsNotebook, Subnotebook,and Palmtop ComputersNext-Generation Device Features♦For Space-Constrained ApplicationsMAX3228E/MAX3229E: ±15kV ESD-Protected, +2.5V to +5.5V, RS-232 Transceivers in UCSP ♦For Low-Voltage or Data Cable ApplicationsMAX3380E/MAX3381E: +2.35V to +5.5V, 1µA, 2Tx/2Rx, RS-232 Transceivers with ±15kV ESD-Protected I/O and Logic PinsMAX3222E/MAX3232E/MAX3237E/MAX3241E †/MAX3246E±15kV ESD-Protected, Down to 10nA, 3.0V to 5.5V ,Up to 1Mbps, True RS-232 Transceivers________________________________________________________________Maxim Integrated Products 119-1298; Rev 11; 10/07Ordering Information continued at end of data sheet.*Dice are tested at T A = +25°C, DC parameters only.**EP = Exposed paddle.Pin Configurations, Selector Guide, and Typical Operating Circuits appear at end of data sheet.MegaBaud and UCSP are trademarks of Maxim Integrated Products, Inc.†Covered by U.S. Patent numbers 4,636,930; 4,679,134;4,777,577; 4,797,899; 4,809,152; 4,897,774; 4,999,761; and other patents pending.M A X 3222E /M A X 3232E /M A X 3237E /M A X 3241E †/M A X 3246EUp to 1Mbps, True RS-232 TransceiversABSOLUTE MAXIMUM RATINGSELECTRICAL CHARACTERISTICS(V CC = +3V to +5.5V, C1–C4 = 0.1µF, T A = T MIN to T MAX , unless otherwise noted. Typical values are at T A = +25°C.) (Notes 3, 4)Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.V CC to GND..............................................................-0.3V to +6V V+ to GND (Note 1)..................................................-0.3V to +7V V- to GND (Note 1)...................................................+0.3V to -7V V+ + |V-| (Note 1).................................................................+13V Input Voltages T_IN, EN , SHDN , MBAUD to GND ........................-0.3V to +6V R_IN to GND.....................................................................±25V Output Voltages T_OUT to GND...............................................................±13.2V R_OUT, R_OUTB (MAX3241E)................-0.3V to (V CC + 0.3V)Short-Circuit Duration, T_OUT to GND.......................Continuous Continuous Power Dissipation (T A = +70°C)16-Pin SSOP (derate 7.14mW/°C above +70°C)..........571mW 16-Pin TSSOP (derate 9.4mW/°C above +70°C).......754.7mW 16-Pin TQFN (derate 20.8mW/°C above +70°C).....1666.7mW 16-Pin Wide SO (derate 9.52mW/°C above +70°C).....762mW 18-Pin Wide SO (derate 9.52mW/°C above +70°C).....762mW 18-Pin PDIP (derate 11.11mW/°C above +70°C)..........889mW 20-Pin TQFN (derate 21.3mW/°C above +70°C)........1702mW 20-Pin TSSOP (derate 10.9mW/°C above +70°C)........879mW 20-Pin SSOP (derate 8.00mW/°C above +70°C)..........640mW 28-Pin SSOP (derate 9.52mW/°C above +70°C)..........762mW 28-Pin Wide SO (derate 12.50mW/°C above +70°C).............1W 28-Pin TSSOP (derate 12.8mW/°C above +70°C)......1026mW 32-Lead Thin QFN (derate 33.3mW/°C above +70°C)..2666mW 6 x 6 UCSP (derate 12.6mW/°C above +70°C).............1010mW Operating Temperature Ranges MAX32_ _EC_ _...................................................0°C to +70°C MAX32_ _EE_ _.................................................-40°C to +85°C Storage Temperature Range.............................-65°C to +150°C Lead Temperature (soldering, 10s).................................+300°C Bump Reflow Temperature (Note 2)Infrared, 15s..................................................................+200°C Vapor Phase, 20s..........................................................+215°C Note 1:V+ and V- can have maximum magnitudes of 7V, but their absolute difference cannot exceed 13V.Note 2:This device is constructed using a unique set of packaging techniques that impose a limit on the thermal profile the devicecan be exposed to during board-level solder attach and rework. This limit permits only the use of the solder profiles recom-mended in the industry-standard specification, JEDEC 020A, paragraph 7.6, Table 3 for IR/VPR and convection reflow.Preheating is required. Hand or wave soldering is not allowed.MAX3222E/MAX3232E/MAX3237E/MAX3241E †/MAX3246EUp to 1Mbps, True RS-232 Transceivers_______________________________________________________________________________________3M A X 3222E /M A X 3232E /M A X 3237E /M A X 3241E †/M A X 3246EUp to 1Mbps, True RS-232 Transceivers4_______________________________________________________________________________________TIMING CHARACTERISTICS—MAX3237E(V CC = +3V to +5.5V, C1–C4 = 0.1µF, T A = T MIN to T MAX , unless otherwise noted. Typical values are at T A = +25°C.) (Note 3)±10%. MAX3237E: C1–C4 = 0.1µF tested at +3.3V ±5%, C1–C4 = 0.22µF tested at +3.3V ±10%; C1 = 0.047µF, C2, C3, C4 =0.33µF tested at +5.0V ±10%. MAX3246E; C1-C4 = 0.22µF tested at +3.3V ±10%; C1 = 0.22µF, C2, C3, C4 = 0.54µF tested at 5.0V ±10%.Note 4:MAX3246E devices are production tested at +25°C. All limits are guaranteed by design over the operating temperature range.Note 5:The MAX3237E logic inputs have an active positive feedback resistor. The input current goes to zero when the inputs are atthe supply rails.Note 6:MAX3241EEUI is specified at T A = +25°C.Note 7:Transmitter skew is measured at the transmitter zero crosspoints.TIMING CHARACTERISTICS—MAX3222E/MAX3232E/MAX3241E/MAX3246EMAX3222E/MAX3232E/MAX3237E/MAX3241E †/MAX3246EUp to 1Mbps, True RS-232 Transceivers_______________________________________________________________________________________5-6-4-202460MAX3237ETRANSMITTER OUTPUT VOLTAGE vs. LOAD CAPACITANCE (MBAUD = GND)LOAD CAPACITANCE (pF)T R A N S M I T T E R O U T P U T V O L T A G E (V )10001500500200025003000531-1-3-5-6-2-42046-5-31-135010001500500200025003000LOAD CAPACITANCE (pF)T R A N S M I T T E R O U T P U T V O L T A G E (V )MAX3237ETRANSMITTER OUTPUT VOLTAGEvs. LOAD CAPACITANCE-7.5-5.0-2.502.55.07.5MAX3237ETRANSMITTER OUTPUT VOLTAGE vs. LOAD CAPACITANCE (MBAUD = V CC )LOAD CAPACITANCE (pF)T R A N S M I T T E R O U T P U T V O L T A G E (V )500100015002000__________________________________________Typical Operating Characteristics(V CC = +3.3V, 250kbps data rate, 0.1µF capacitors, all transmitters loaded with 3k Ωand C L , T A = +25°C, unless otherwise noted.)-6-5-4-3-2-10123456010002000300040005000MAX3241ETRANSMITTER OUTPUT VOLTAGEvs. LOAD CAPACITANCELOAD CAPACITANCE (pF)T R A N S M I T T E R O U T P U T V O L T A G E (V)302010405060020001000300040005000MAX3241EOPERATING SUPPLY CURRENT vs. LOAD CAPACITANCELOAD CAPACITANCE (pF)S U P P L Y C U R R E N T (m A )04286121014010002000300040005000MAX3241ESLEW RATE vs. LOAD CAPACITANCEM A X 3237E t o c 05LOAD CAPACITANCE (pF)S L E W R A T E (V /μs )-6-5-4-3-2-10123456010002000300040005000MAX3222E/MAX3232ETRANSMITTER OUTPUT VOLTAGEvs. LOAD CAPACITANCELOAD CAPACITANCE (pF)T R A N S M I T T E R O U T P UT V O L T A G E (V )624108141216010002000300040005000MAX3222E/MAX3232ESLEW RATE vs. LOAD CAPACITANCELOAD CAPACITANCE (pF)S L E W R A T E (V /μs)2520155103530404520001000300040005000MAX3222E/MAX3232E OPERATING SUPPLY CURRENT vs. LOAD CAPACITANCELOAD CAPACITANCE (pF)S U P P L Y C U R R E N T (m A )M A X 3222E /M A X 3232E /M A X 3237E /M A X 3241E †/M A X 3246EUp to 1Mbps, True RS-232 Transceivers6_______________________________________________________________________________________Typical Operating Characteristics (continued)(V CC = +3.3V, 250kbps data rate, 0.1µF capacitors, all transmitters loaded with 3k Ωand C L , T A = +25°C, unless otherwise noted.)20604080100MAX3237ETRANSMITTER SKEW vs. LOAD CAPACITANCE(MBAUD = V CC )LOAD CAPACITANCE (pF)100015005002000T R A N S M I T T E R S K E W (n s )-6-2-42046-3-51-1352.03.03.52.54.04.55.0SUPPLY VOLTAGE (V)T R A N S M I T T E R O U T P U T V O L T A G E (V )MAX3237ETRANSMITTER OUTPUT VOLTAGE vs. SUPPLY VOLTAGE (MBAUD = GND)10203040502.0MAX3237E SUPPLY CURRENT vs. SUPPLY VOLTAGE (MBAUD = GND)SUPPLY VOLTAGE (V)S U P P L Y C U R R E N T (m A )3.03.52.54.04.55.0MAX3246ETRANSMITTER OUTPUT VOLTAGEvs. LOAD CAPACITANCELOAD CAPACITANCE (pF)T R A N S M I T T E R O U T P U T V O L T A G E (V )4000300010002000-5-4-3-2-101234567-65000468101214160MAX3246ESLEW RATE vs. LOAD CAPACITANCELOAD CAPACITANCE (pF)S L EW R A T E (V /μs )200030001000400050001020304050600MAX3246EOPERATING SUPPLY CURRENT vs. LOAD CAPACITANCEM A X 3237E t o c 17LOAD CAPACITANCE (pF)S U P P L Y C U R R EN T (m A )1000200030004000500055453525155024681012MAX3237ESLEW RATE vs. LOAD CAPACITANCE(MBAUD = GND)LOAD CAPACITANCE (pF)S L E W R A T E (V /μs )10001500500200025003000010203050406070MAX3237ESLEW RATE vs. LOAD CAPACITANCE(MBAUD = V CC )LOAD CAPACITANCE (pF)S L E W R A T E (V /μs )5001000150020001020304050MAX3237ESUPPLY CURRENT vs. LOAD CAPACITANCE WHEN TRANSMITTING DATA (MBAUD = GND)LOAD CAPACITANCE (pF)S U P P L Y C U R R E N T (m A )10001500500200025003000MAX3222E/MAX3232E/MAX3237E/MAX3241E †/MAX3246EUp to 1Mbps, True RS-232 Transceivers_______________________________________________________________________________________7Pin DescriptionM A X 3222E /M A X 3232E /M A X 3237E /M A X 3241E †/M A X 3246EUp to 1Mbps, True RS-232 Transceivers8_______________________________________________________________________________________MAX3222E/MAX3232E/MAX3237E/MAX3241E †/MAX3246EUp to 1Mbps, True RS-232 Transceivers_______________________________________________________________________________________9Detailed DescriptionDual Charge-Pump Voltage ConverterThe MAX3222E/MAX3232E/MAX3237E/MAX3241E/MAX3246Es’ internal power supply consists of a regu-lated dual charge pump that provides output voltages of +5.5V (doubling charge pump) and -5.5V (inverting charge pump) over the +3.0V to +5.5V V CC range. The charge pump operates in discontinuous mode; if the output voltages are less than 5.5V, the charge pump is enabled, and if the output voltages exceed 5.5V, the charge pump is disabled. Each charge pump requires a flying capacitor (C1, C2) and a reservoir capacitor (C3, C4) to generate the V+ and V- supplies (Figure 1).RS-232 TransmittersThe transmitters are inverting level translators that con-vert TTL/CMOS-logic levels to ±5V EIA/TIA-232-compli-ant levels.The MAX3222E/MAX3232E/MAX3237E/MAX3241E/MAX3246E transmitters guarantee a 250kbps data rate with worst-case loads of 3k Ωin parallel with 1000pF,providing compatibility with PC-to-PC communication software (such as LapLink™). Transmitters can be par-alleled to drive multiple receivers or mice.The MAX3222E/MAX3237E/MAX3241E/MAX3246E transmitters are disabled and the outputs are forcedinto a high-impedance state when the device is in shut-down mode (SHDN = G ND). The MAX3222E/MAX3232E/MAX3237E/MAX3241E/MAX3246E permit the outputs to be driven up to ±12V in shutdown.The MAX3222E/MAX3232E/MAX3241E/MAX3246E transmitter inputs do not have pullup resistors. Connect unused inputs to GND or V CC . The MAX3237E’s trans-mitter inputs have a 400k Ωactive positive-feedback resistor, allowing unused inputs to be left unconnected.MAX3237E MegaBaud OperationFor higher-speed serial communications, the MAX3237E features MegaBaud operation. In MegaBaud operating mode (MBAUD = V CC ), the MAX3237E transmitters guarantee a 1Mbps data rate with worst-case loads of 3k Ωin parallel with 250pF for +3.0V < V CC < +4.5V. For +5V ±10% operation, the MAX3237E transmitters guarantee a 1Mbps data rate into worst-case loads of 3k Ωin parallel with 1000pF.RS-232 ReceiversThe receivers convert RS-232 signals to CMOS-logic output levels. The MAX3222E/MAX3237E/MAX3241E/MAX3246E receivers have inverting three-state outputs.Drive EN high to place the receiver(s) into a high-impedance state. Receivers can be either active or inactive in shutdown (Table 1).Figure 1. Slew-Rate Test CircuitsLapLink is a trademark of Traveling Software.M A X 3222E /M A X 3232E /M A X 3237E /M A X 3241E †/M A X 3246EUp to 1Mbps, True RS-232 Transceivers10______________________________________________________________________________________The complementary outputs on the MAX3237E/MAX3241E (R_OUTB) are always active, regardless of the state of EN or SHDN . This allows the device to be used for ring indicator applications without forward biasing other devices connected to the receiver outputs. This is ideal for systems where V CC drops to zero in shutdown to accommodate peripherals such as UARTs (Figure 2).MAX3222E/MAX3237E/MAX3241E/MAX3246E Shutdown ModeSupply current falls to less than 1µA in shutdown mode (SHDN = low). The MAX3237E’s supply current falls to10nA (typ) when all receiver inputs are in the invalid range (-0.3V < R_IN < +0.3). When shut down, the device’s charge pumps are shut off, V+ is pulled down to V CC , V- is pulled to ground, and the transmitter out-puts are disabled (high impedance). The time required to recover from shutdown is typically 100µs, as shown in Figure 3. Connect SHDN to V CC if shutdown mode is not used. SHDN has no effect on R_OUT or R_OUTB (MAX3237E/MAX3241E).±15kV ESD ProtectionAs with all Maxim devices, ESD-protection structures are incorporated to protect against electrostatic dis-charges encountered during handling and assembly.The driver outputs and receiver inputs of the MAX3222E/MAX3232E/MAX3237E/MAX3241E/MAX3246E have extra protection against static electricity. Maxim’s engineers have developed state-of-the-art structures to protect these pins against ESD of ±15kV without damage.The ESD structures withstand high ESD in all states:normal operation, shutdown, and powered down. After an ESD event, Maxim’s E versions keep working without latchup, whereas competing RS-232 products can latch and must be powered down to remove latchup.Furthermore, the MAX3237E logic I/O pins also have ±15kV ESD protection. Protecting the logic I/O pins to ±15kV makes the MAX3237E ideal for data cable applications.SHDN T2OUTT1OUT5V/div2V/divV CC = 3.3V C1–C4 = 0.1μFFigure 3. Transmitter Outputs Recovering from Shutdown or Powering UpMAX3222E/MAX3232E/MAX3237E/MAX3241E †/MAX3246EUp to 1Mbps, True RS-232 TransceiversESD protection can be tested in various ways; the transmitter outputs and receiver inputs for the MAX3222E/MAX3232E/MAX3241E/MAX3246E are characterized for protection to the following limits:•±15kV using the Human Body Model•±8kV using the Contact Discharge method specified in IEC 1000-4-2•±9kV (MAX3246E only) using the Contact Discharge method specified in IEC 1000-4-2•±15kV using the Air-G ap Discharge method speci-fied in IEC 1000-4-2Figure 4a. Human Body ESD Test ModelFigure 4b. Human Body Model Current WaveformFigure 5a. IEC 1000-4-2 ESD Test Model Figure 5b. IEC 1000-4-2 ESD Generator Current WaveformM A X 3222E /M A X 3232E /M A X 3237E /M A X 3241E †/M A X 3246EUp to 1Mbps, True RS-232 Transceiverscharacterized for protection to ±15kV per the Human Body Model.ESD Test ConditionsESD performance depends on a variety of conditions.Contact Maxim for a reliability report that documents test setup, test methodology, and test results.Human Body ModelFigure 4a shows the Human Body Model, and Figure 4b shows the current waveform it generates when dis-charged into a low impedance. This model consists of a 100pF capacitor charged to the ESD voltage of interest,which is then discharged into the test device through a 1.5k Ωresistor.IEC 1000-4-2The IEC 1000-4-2 standard covers ESD testing and performance of finished equipment; it does not specifi-cally refer to integrated circuits. The MAX3222E/MAX3232E/MAX3237E/MAX3241E/MAX3246E help you design equipment that meets level 4 (the highest level)of IEC 1000-4-2, without the need for additional ESD-protection components.The major difference between tests done using the Human Body Model and IEC 1000-4-2 is higher peak current in IEC 1000-4-2, because series resistance is lower in the IEC 1000-4-2 model. Hence, the ESD with-stand voltage measured to IEC 1000-4-2 is generally lower than that measured using the Human Body Model. Figure 5a shows the IEC 1000-4-2 model, and Figure 5b shows the current waveform for the ±8kV IEC 1000-4-2 level 4 ESD Contact Discharge test. The Air-G ap Discharge test involves approaching the device with a charged probe. The Contact Discharge method connects the probe to the device before the probe is energized.Machine ModelThe Machine Model for ESD tests all pins using a 200pF storage capacitor and zero discharge resis-tance. Its objective is to emulate the stress caused by contact that occurs with handling and assembly during manufacturing. All pins require this protection during manufacturing, not just RS-232 inputs and outputs.Therefore, after PC board assembly, the Machine Model is less relevant to I/O ports.Table 2. Required Minimum Capacitor ValuesFigure 6a. MAX3241E Transmitter Output Voltage vs. Load Current Per TransmitterTable 3. Logic-Family Compatibility with Various Supply VoltagesMAX3222E/MAX3232E/MAX3237E/MAX3241E †/MAX3246EUp to 1Mbps, True RS-232 TransceiversApplications InformationCapacitor SelectionThe capacitor type used for C1–C4 is not critical for proper operation; polarized or nonpolarized capacitors can be used. The charge pump requires 0.1µF capaci-tors for 3.3V operation. For other supply voltages, see Table 2 for required capacitor values. Do not use val-ues smaller than those listed in Table 2. Increasing the capacitor values (e.g., by a factor of 2) reduces ripple on the transmitter outputs and slightly reduces power consumption. C2, C3, and C4 can be increased without changing C1’s value. However, do not increase C1without also increasing the values of C2, C3, C4,and C BYPASS to maintain the proper ratios (C1 to the other capacitors).When using the minimum required capacitor values,make sure the capacitor value does not degradeexcessively with temperature. If in doubt, use capaci-tors with a larger nominal value. The capacitor’s equiv-alent series resistance (ESR), which usually rises at low temperatures, influences the amount of ripple on V+and V-.Power-Supply DecouplingIn most circumstances, a 0.1µF V CC bypass capacitor is adequate. In applications sensitive to power-supply noise, use a capacitor of the same value as charge-pump capacitor C1. Connect bypass capacitors as close to the IC as possible.Operation Down to 2.7VTransmitter outputs meet EIA/TIA-562 levels of ±3.7V with supply voltages as low as 2.7V.Figure 6b. Mouse Driver Test CircuitM A X 3222E /M A X 3232E /M A X 3237E /M A X 3241E †/M A X 3246EUp to 1Mbps, True RS-232 TransceiversFigure 7. Loopback Test CircuitT1IN T1OUTR1OUT5V/div5V/div5V/divV CC = 3.3V C1–C4 = 0.1μFFigure 8. MAX3241E Loopback Test Result at 120kbps T1INT1OUTR1OUT5V/div5V/div5V/divV CC = 3.3V, C1–C4 = 0.1μFFigure 9. MAX3241E Loopback Test Result at 250kbps+5V 0+5V 0-5V +5VT_INT_OUT5k Ω + 250pFR_OUTV CC = 3.3V C1–C4 = 0.1μFFigure 10. MAX3237E Loopback Test Result at 1000kbps (MBAUD = V CC )Transmitter Outputs Recoveringfrom ShutdownFigure 3 shows two transmitter outputs recovering from shutdown mode. As they become active, the two trans-mitter outputs are shown going to opposite RS-232 levels (one transmitter input is high; the other is low). Each transmitter is loaded with 3k Ωin parallel with 2500pF.The transmitter outputs display no ringing or undesir-able transients as they come out of shutdown. Note thatthe transmitters are enabled only when the magnitude of V- exceeds approximately -3.0V.Mouse DrivabilityThe MAX3241E is designed to power serial mice while operating from low-voltage power supplies. It has been tested with leading mouse brands from manu-facturers such as Microsoft and Logitech. The MAX3241E successfully drove all serial mice tested and met their current and voltage requirements.MAX3222E/MAX3232E/MAX3237E/MAX3241E †/MAX3246EUp to 1Mbps, True RS-232 TransceiversFigure 6a shows the transmitter output voltages under increasing load current at +3.0V. Figure 6b shows a typical mouse connection using the MAX3241E.High Data RatesThe MAX3222E/MAX3232E/MAX3237E/MAX3241E/MAX3246E maintain the RS-232 ±5V minimum transmit-ter output voltage even at high data rates. Figure 7shows a transmitter loopback test circuit. Figure 8shows a loopback test result at 120kbps, and Figure 9shows the same test at 250kbps. For Figure 8, all trans-mitters were driven simultaneously at 120kbps into RS-232 loads in parallel with 1000pF. For Figure 9, a single transmitter was driven at 250kbps, and all transmitters were loaded with an RS-232 receiver in parallel with 1000pF.The MAX3237E maintains the RS-232 ±5.0V minimum transmitter output voltage at data rates up to 1Mbps.Figure 10 shows a loopback test result at 1Mbps with MBAUD = V CC . For Figure 10, all transmitters were loaded with an RS-232 receiver in parallel with 250pF.Interconnection with 3V and 5V LogicThe MAX3222E/MAX3232E/MAX3237E/MAX3241E/MAX3246E can directly interface with various 5V logic families, including ACT and HCT CMOS. See Table 3for more information on possible combinations of inter-connections.UCSP ReliabilityThe UCSP represents a unique packaging form factor that may not perform equally to a packaged product through traditional mechanical reliability tests. UCSP reliability is integrally linked to the user’s assembly methods, circuit board material, and usage environ-ment. The user should closely review these areas when considering use of a UCSP package. Performance through Operating Life Test and Moisture Resistance remains uncompromised as the wafer-fabrication process primarily determines it.Mechanical stress performance is a greater considera-tion for a UCSP package. UCSPs are attached through direct solder contact to the user’s PC board, foregoing the inherent stress relief of a packaged product lead frame. Solder joint contact integrity must be consid-ered. Table 4 shows the testing done to characterize the UCSP reliability performance. In conclusion, the UCSP is capable of performing reliably through envi-ronmental stresses as indicated by the results in the table. Additional usage data and recommendations are detailed in the UCSP application note, which can be found on Maxim’s website at .Table 4. Reliability Test DataM A X 3222E /M A X 3232E /M A X 3237E /M A X 3241E †/M A X 3246EUp to 1Mbps, True RS-232 Transceivers__________________________________________________________Pin ConfigurationsMAX3222E/MAX3232E/MAX3237E/MAX3241E †/MAX3246EUp to 1Mbps, True RS-232 TransceiversPin Configurations (continued)M A X 3222E /M A X 3232E /M A X 3237E /M A X 3241E †/M A X 3246EUp to 1Mbps, True RS-232 Transceivers__________________________________________________Typical Operating CircuitsMAX3222E/MAX3232E/MAX3237E/MAX3241E †/MAX3246EUp to 1Mbps, True RS-232 Transceivers_____________________________________Typical Operating Circuits (continued)M A X 3222E /M A X 3232E /M A X 3237E /M A X 3241E †/M A X 3246EUp to 1Mbps, True RS-232 Transceivers_____________________________________Typical Operating Circuits (continued)MAX3222E/MAX3232E/MAX3237E/MAX3241E †/MAX3246EUp to 1Mbps, True RS-232 Transceivers______________________________________________________________________________________21Selector Guide___________________Chip InformationTRANSISTOR COUNT:MAX3222E/MAX3232E: 1129MAX3237E: 2110MAX3241E: 1335MAX3246E: 842PROCESS: BICMOSOrdering Information (continued)†Requires solder temperature profile described in the AbsoluteMaximum Ratings section. UCSP Reliability is integrally linked to the user’s assembly methods, circuit board material, and environment. Refer to the UCSP Reliability Notice in the UCSP Reliability section of this datasheet for more information.**EP = Exposed paddle.。

MAX31785中文资料

_________________________________________________________________Maxim Integrated Products __1本文是英文数据资料的译文，文中可能存在翻译上的不准确或错误。

如需进一步确认，请在您的设计中参考英文资料。

有关价格、供货及订购信息，请联络Maxim 亚洲销售中心：10800 852 1249 (北中国区)，10800 152 1249 (南中国区)，或访问Maxim 的中文网站：。

6通道智能风扇控制器MAX3178519-5703; Rev 0; 12/10+表示无铅(Pb)/符合RoHS 标准的封装。

T = 卷带包装。

*EP = 裸焊盘。

概述MAX31785是一款闭环多通道风扇控制器。

自动闭环风扇控制架构将风扇控制在尽可能低的转速，从而节省系统功率。

低风扇转速的其它优势包括：有效降低可闻噪声和更长的风扇寿命、更少的系统维护。

根据用户可编程查找表(LUT)，器件根据11个温度传感器中的一个或多个传感器测量值，自动调节6个独立风扇的转速。

也可以由外部主机手动控制风扇转速，器件自动调整风扇转速。

器件具有风扇状况诊断功能，帮助用户预防将要发生的风扇故障。

器件还可监测多达6路远端电压。

应用网络交换机/路由器基站服务器智能电网系统工业控制定购信息特性S 6路独立的风扇控制通道支持3线和4线风扇自动闭环风扇转速控制基于RPM 或PWM 控制可选手动控制模式快速、慢速PWM 频率选项风扇交替启动，缓解电源压力双转速计(支持12个风扇) 风扇故障检测风扇运转状态监测非易失风扇运转时间表S 支持多达11个温度传感器6个外部温度二极管，带有串联电阻自动抵消功能 1个内部温度传感器 4个I 2C 数字温度传感器对所有温度传感器进行故障检测S 6路ADC 测量远端电压S PMBus™兼容命令接口S I 2C/SMBus™兼容串行总线，带有总线超时功能S 板载非易失故障记录和默认配置设置S 无需外部时钟S +3.3V 供电PMBus 是SMIF, Inc.的商标。

MAX1722EZK-T中文资料

GND 2
MAX1722
FB 3
4
OUT
THIN SOT23-5
Pin Configurations are continued at end of data sheet.
________________________________________________________________ Maxim Integrated Products
元器件交易网
19-1735; Rev 0; 7/01
1.5µA IQ, Step-Up DC-DC Converters in Thin SOT23-5
General Description
The MAX1722/MAX1723/MAX1724 compact, high-efficiency, step-up DC-DC converters are available in tiny, 5pin thin SOT23 packages. They feature an extremely low 1.5µA quiescent supply current to ensure the highest possible light-load efficiency. Optimized for operation from one to two alkaline or nickel-metal-hydride (NiMH) cells, or a single Li+ cell, these devices are ideal for applications where extremely low quiescent current and ultra-small size are critical. Built-in synchronous rectification significantly improves efficiency and reduces size and cost by eliminating the need for an external Schottky diode. All three devices feature a 0.5Ω N-channel power switch. The MAX1722/ MAX1724 also feature proprietary noise-reduction circuitry, which suppresses electromagnetic interference (EMI) caused by the inductor in many step-up applications. The family offers different combinations of fixed or adjustable outputs, shutdown, and EMI reduction (see Selector Guide). o o o o o o o o o o o

MAX1487ECSA中文资料

Driver Input Voltage (DI).............................-0.5V to (VCC + 0.5V)
Driver Output Voltage (Y, Z; A, B) ..........................-8V to +12.5V
Receiver Input Voltage (A, B).................................-8V to +12.5V
♦ For Space-Constrained Applications: MAX3460–MAX3464: +5V, Fail-Safe, 20Mbps, Profibus, RS-485/RS-422 Transceivers MAX3362: +3.3V, High-Speed, RS-485/RS-422 Transceiver in a SOT23 Package MAX3280E–MAX3284E: ±15kV ESD-Protected, 52Mbps, +3V to +5.5V, SOT23, RS-485/RS-422 True Fail-Safe Receivers MAX3030E–MAX3033E: ±15kV ESD-Protected, +3.3V, Quad RS-422 Transmitters
元器件交易网
MAX481E/MAX483E/MAX485E/MAX487E–MAX491E/MAX1487E
19-0410; Rev 4; 10/03
±15kV ESD-Protected, Slew-Rate-Limited, Low-Power, RS-485/RS-422 Transceivers

MAX8888EZK33-T中文资料

General DescriptionThe MAX8887/MAX8888 low-dropout linear regulators operate from a 2.5V to 5.5V input and deliver up to 300mA continuous (500mA pulsed) current. The MAX8887 is optimized for low-noise operation, while the MAX8888 includes an open-drain POK ouput flag. Both regulators feature exceptionally low 100mV dropout at 200mA. These devices are available in a variety of pre-set output voltages in the 1.5V to 3.3V range.An internal PMOS pass transistor allows the low 55µA supply current to remain independent of load, making these devices ideal for portable battery-powered equip-ment such as personal digital assistants (PDAs), cellu-lar phones, cordless phones, and notebook computers.Other features include a micropower shutdown mode,short-circuit protection, thermal shutdown protection,and an active-low open-drain power-OK (POK) output that indicates when the output is out of regulation. The MAX8887/MAX8888 are available in a thin 5-pin SOT23package that is only 1mm high.________________________ApplicationsNotebook Computers Wireless HandsetsPDAs and Palmtop Computers Digital Cameras PCMCIA Cards Hand-Held InstrumentsFeatures♦Guaranteed 300mA Output Current (500mA for Pulsed Loads)♦Low 100mV Dropout at 200mA Load ♦POK Output (MAX8888)♦42µV RMS Output Noise (MAX8887)♦Preset Output Voltages (1.5V, 1.8V, 2.85V, and 3.3V)♦55µA No-Load Supply Current♦Thermal Overload and Short-Circuit Protection ♦Foldback Output Current-Limit Protection ♦60dB PSRR at 1kHz ♦0.1µA Shutdown Current♦Thin 5-Pin SOT23 Package, 1mm HighMAX8887/MAX8888Low-Dropout, 300mA Linear Regulators in SOT23________________________________________________________________Maxim Integrated Products 1Pin ConfigurationsTypical Operating Circuit19-1859; Rev 2; 6/04Ordering Information*Other versions (xy) between +1.5 and +3.3V are available in 100mV increments. Contact factory for other versions. Minimum order quantity is 25,000 units.For pricing, delivery, and ordering information,please contact Maxim/Dallas Direct!at 1-888-629-4642, or visit Maxim’s website at .M A X 8887/M A X 88882_______________________________________________________________________________________ABSOLUTE MAXIMUM RATINGSELECTRICAL CHARACTERISTICS(V IN = V OUT + 1V, SHDN = IN, T A = -40°C to +85°C, unless otherwise noted.) (Note 1)Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.IN, SHDN , POK, to GND...........................................-0.3V to +7V OUT, BP to GND............................................-0.3 to (V IN + 0.3V)Output Short-Circuit Duration.....................................Continuous Continuous Power Dissipation (T A = +70°C)5-Pin SOT23 (derate 9.1mW/°C above +70°C)............727mWOperating Temperature Ranges..........................-40°C to +85°C Junction Temperature......................................................+150°C Storage Temperature Range.............................-65°C to +150°C Lead Temperature (soldering, 10s).................................+500°CMAX8887/MAX8888_______________________________________________________________________________________3ELECTRICAL CHARACTERISTICS (continued)(V IN = V OUT + 1V, SHDN = IN, T A = -40°C to +85°C, unless otherwise noted.) (Note 1)Note 2:Typical and maximum dropout voltage for different output voltages are shown in the Typical Operating Characteristicscurve.Typical Operating Characteristics(Typical Operating Circuit , T A = +25°C, unless otherwise noted.)01.00.52.01.53.02.53.52.03.03.52.54.04.55.05.5OUTPUT VOLTAGE vs. INPUT VOLTAGEINPUT VOLTAGE (V)O U T P U T V O L T A G E (V )-1.0-0.6-0.80.0-0.2-0.40.20.40.80.61.010050150200250300OUTPUT VOLTAGE ACCURACYvs. LOAD CURRENTM A X 8887/8 t o c 02LOAD CURRENT (mA)% D E V I A T I O N (%)0-0.05-0.02-0.03-0.04-0.010.00.010.020.030.040.05-4010-15356085OUTPUT VOLTAGE ACCURACYvs. TEMPERATURETEMPERATURE (°C)% D E V I A T I O NM A X 8887/M A X 88884_______________________________________________________________________________________020406080100120140160010050150200250300DROPOUT VOLTAGE vs. LOAD CURRENTLOAD CURRENT (mA)V D R O P O U T (m V )0501001502002503002.52.72.93.13.3DROPOUT VOLTAGE vs. OUTPUT VOLTAGEV OUT (V)V D R O P O U T (m V )1.02.03.04.05.0INPUT VOLTAGE (V)0502510075125150GROUND-PIN CURRENT vs. INPUT VOLTAGEG R O U N D -P I N C U R R E N T (µA )02060408010010050150200250300GROUND-PIN CURRENT vs. LOAD CURRENTLOAD CURRENT (mA)G R O U N D -P I N C U R R E N T (µA )5056545258606264666870-4010-15356085GROUND-PIN CURRENT vs. TEMPERATURETEMPERATURE (°C)G R O U N D -P I N C U R R E N T (µA )700.010.111010010006050403020POWER-SUPPLY REJECTION RATIOvs. FREQUENCYFREQUENCY (kHz)P S R R (d B )10MAX8887OUTPUT NOISE DC TO 1MHzV OUT 50µV/div40ms/divV OUT = 1.8V, V IN = 3.8V, I LOAD = 15m ALOAD-TRANSIENT RESPONSE50mV/div AC-COUPLED 300mA10mAV OUTI OUTV OUT = 3.3V V IN = 3.8V10µs/divTypical Operating Characteristics (continued)(Typical Operating Circuit , T A = +25°C, unless otherwise noted.)MAX8887/MAX8888LINE-TRANSIENT RESPONSE20mV/div AC-COUPLED4V4.5VV OUTV INV OUT = 3.3V I LOAD = 100mA100µs/divSHUTDOWN WAVEFORMV SHDN1V/divDC-COUPLED2V/divV OUTV OUT = 3.3V, R LOAD = 10Ω20µs/divPOK WAVEFORM2V/div2V/div2V/divV OUT V POK V INV OUT = 3.3V, R LOAD = 100Ω20ms/divLOAD-TRANSIENT RESPONSENEAR DROPOUT50mV/div AC-COUPLED300mA10mAV OUTI OUT10µs/divTypical Operating Characteristics (continued)(Typical Operating Circuit , T A = +25°C, unless otherwise noted.)Detailed DescriptionThe MAX8887/MAX8888 are low-dropout, low-quies-cent-current linear regulators designed primarily for battery-powered applications. The devices supply loads up to 300mA and are available in several fixed output voltages in the 1.5V to 3.3V range. The MAX8887 is optimized for low-noise operation, while the MAX8888 includes an open-drain POK output flag.As illustrated in Figure 1, the MAX8888 consists of a 1.25V reference, error amplifier, P-channel pass tran-sistor, and internal feedback voltage divider.Internal P-Channel Pass TransistorThe MAX8887/MAX8888 feature a 0.5ΩP-channel MOSFET pass transistor. Unlike similar designs using PNP pass transistors, P-channel MOSFETs require no base drive, which reduces quiescent current. PNP-based regulators also waste considerable current in dropout when the pass transistor saturates and use high base drive currents under large loads. The MAX8887/MAX8888 do not suffer from these problems and consume only 55µA of quiescent current under heavy loads as well as in dropout.Output Voltage SelectionThe MAX8887/MAX8888 are supplied with various fac-tory-set output voltages ranging from 1.5V to 3.3V. The part number’s two-digit suffix identifies the nominal out-put voltage. For example, the MAX8887EZK33 has a preset output voltage of 3.3V (see the Ordering Infor-mation ).ShutdownDrive SHDN low to enter shutdown. During shutdown,the output is disconnected from the input and supply current drops to 0.1µA. When in shutdown, POK and OUT are driven low. SHDN can be pulled as high as 6V, regardless of the input and output voltages.Power-OK OutputThe power-OK output (POK) pulls low when OUT is less than 93% of the nominal regulation voltage. Once OUT exceeds 93% of the nominal voltage, POK goes high impedance. POK is an open-drain N-channel output.To obtain a logic level output, connect a pullup resistor from POK to OUT. A 100k Ωresistor works well for most applications. POK can be used as a power-on-reset (POR) signal to a microcontroller (µC) or to drive other logic. Adding a capacitor from POK to ground creates POK delay. When the MAX8887 is shut down, POK is held low independent of the output voltage. If unused,leave POK grounded or unconnected.Current LimitThe MAX8887/MAX8888 monitor and control the pass transistor’s gate voltage, limiting the output current to0.8A (typ). This current limit is reduced to 500mA (typ)when the output voltage is below 93% of the nominal value to provide foldback current limiting.Thermal Overload ProtectionThermal overload protection limits total power dissipa-tion in the MAX8887/MAX8888. When the junction tem-perature exceeds T J =+170°C, a thermal sensor turns off the pass transistor, allowing the device to cool. The thermal sensor turns the pass transistor on again after the junction temperature cools by 20°C, resulting in a pulsed output during continuous thermal overload con-ditions. Thermal overload protection protects the MAX8887/MAX8888 in the event of fault conditions. For continuous operation, do not exceed the absolute maxi-mum junction-temperature rating of T J =+150°C.Operating Region and Power DissipationThe MAX8887/MAX8888’s maximum power dissipation depends on the thermal resistance of the IC package and circuit board. The temperature difference between the die junction and ambient air, and the rate of air flow.The power dissipated in the device is P = I OUT ✕(V IN -V OUT ). The maximum allowed power dissipation is 727mW or:P MAX = (T J(MAX)- T A ) / (θJC + θCA )where T J(MAX)-T A is the temperature difference between the MAX8887/MAX8888 die junction and the surrounding air; θJC is the thermal resistance from the junction to the case; and θCA is the thermal resistance from the case through PC board, copper traces, and other materials to the surrounding air.Refer to Figure 2 for the MAX8887/MAX888 valid oper-ating region.Noise ReductionFor the MAX8887 only, an external 0.01µF bypass capacitor at BP creates a lowpass filter for noise reduc-tion. The MAX8887 exhibits 42µV RMS of output voltage noise with C BP = 0.01µF and C OUT = 2.2µF (see the Typical Operating Characteristics ).Applications InformationCapacitor Selection and RegulatorStabilityConnect a 2.2µF ceramic capacitor between IN and ground and a 2.2µF ceramic capacitor between OUT and ground. The input capacitor (C IN ) lowers the source impedance of the input supply. Reduce noise and improve load-transient response, stability, and power-supply rejection by using a larger ceramic out-put capacitor such as 4.7µF.The output capacitor’s (C OUT ) equivalent series resis-tance (ESR) affects stability and output noise. Use out-M A X 8887/M A X 88886_______________________________________________________________________________________put capacitors with an ESR of 0.1Ωor less to ensure sta-bility and optimum transient response. Surface-mount ceramic capacitors have very low ESR and are com-monly available in values up to 10µF. Connect C IN and C OUT as close to the MAX8887/MAX8888 as possible to minimize the impact of PC board trace inductance.Noise, PSRR, and Transient ResponseThe MAX8887/MAX8888 are designed to operate with low dropout voltages and low quiescent currents in bat-tery-powered systems while still maintaining excellent noise, transient response, and AC rejection. See the Typical Operating Characteristics for a plot of power-supply rejection ratio (PSRR) versus frequency. When operating from noisy sources, improved supply-noise rejection and transient response can be achieved by increasing the values of the input and output bypass capacitors and through passive filtering techniques.Input-Output (Dropout) VoltageA regulator’s minimum input-to-output voltage differen-tial (dropout voltage) determines the lowest usable sup-ply voltage at which the output is regulated. In battery-powered systems, this determines the useful end-of-life battery voltage. The MAX8887/MAX8888 use a P-channel MOSFET pass transistor. Its dropout volt-age is a function of drain-to-source on-resistance (R DS(ON)) multiplied by the load current (see the Typical Operating Characteristics ).V DROPOUT = V IN - V OUT = R DS(ON)✕I OUTChip InformationTRANSISTOR COUNT: 620PROCESS: BiCMOSMAX8887/MAX8888_______________________________________________________________________________________7Figure 1. Functional DiagramFigure 2. Power Operating Regions: Maximum Output Current vs. Input VoltageM A X 8887/M A X 8888Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.8_____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600©2004 Maxim Integrated ProductsPrinted USAis a registered trademark of Maxim Integrated Products.Package Information(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information go to /packages .)。

MAX1848ETA+T;中文规格书,Datasheet资料

General DescriptionThe MAX1848 drives white LEDs with a constant cur-rent to provide backlight in cell phones, PDAs, and other hand-held devices. The step-up converter topology allows series connection of the white LEDs so that the LED currents are identical for uniform brightness. This configuration eliminates the need for ballast resistors and expensive factory calibration. Other benefits include greater simplicity, lower cost, higher efficiency,and greater reliability.This step-up PWM converter includes an internal, high-voltage, low R DSON N-channel MOSFET switch for high efficiency and maximum battery life. A single analog voltage Dual Mode ™input provides a simple means of brightness adjustment and on/off control. Fast 1.2MHz current-mode PWM control allows for small input and output capacitors and a small inductor while minimizing ripple on the input supply/battery. Programmable soft-start eliminates inrush current during startup.The MAX1848 is available in space-saving 8-pin thin QFN (3mm ✕3mm) and 8-pin SOT23 packages.ApplicationsCell Phones and Smart PhonesPDAs, Palmtops, and Wireless Handhelds e-Books and Subnotebooks White LED Display BacklightingFeatures♦Constant Current Regulation for Uniform Illumination♦High 87% Efficiency♦Analog or Logic Control of LED Intensity ♦0.8W Output Power with Internal High-Voltage MOSFET Switch♦Small, Low-Profile External Components ♦2.6V to 5.5V Input Range♦13V Maximum Output with Overvoltage Protection ♦Optimized for Low Input Ripple ♦Programmable Soft-Start ♦0.3µA Shutdown Current♦Small 8-pin Thin QFN (3mm ✕3mm) and 8-Pin SOT23 PackagesMAX1848White LED Step-Up Converter in SOT23________________________________________________________________Maxim Integrated Products1Pin ConfigurationOrdering InformationTypical Application Circuit19-2028; Rev 2; 8/05Note:Hand soldering is not recommended for the MAX1848SOT23 package.Dual Mode is a trademark of Maxim Integrated Products, Inc.For pricing, delivery, and ordering information,please contact Maxim/Dallas Direct!at 1-888-629-4642, or visit Maxim’s website at .+ Denotes lead-free package.M A X 1848White LED Step-Up Converter in SOT232_______________________________________________________________________________________ABSOLUTE MAXIMUM RATINGSDC ELECTRICAL CHARACTERISTICSStresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.V+ to GND................................................................-0.3V to +6V PGND to GND .......................................................-0.3V to +0.3V LX, OUT to GND.....................................................-0.3V to +14V LX to OUT...............................................................-14V to +0.3V CTRL to GND.......................................-0.3V to +6V or (V+ + 2V)COMP, CS to GND.......................................-0.3V to (V+ + 0.3V)LX Current ....................................................................0.45A RMSContinuous Power Dissipation (T A = +70°C)8-Pin SOT23 (derate 9.7mW/°C above +70°C).............777mW 8-Pin Thin QFN 3mm ✕3mm (derate 24.4mW/°Cabove +70°C)..............................................................1951mW Operating Temperature Range ...........................-40°C to +85°C Junction Temperature......................................................+150°C Storage Temperature Range.............................-60°C to +150°C Lead Temperature (soldering, 10s).................................+300°CMAX1848White LED Step-Up Converter in SOT23_______________________________________________________________________________________3DC ELECTRICAL CHARACTERISTICS (continued)(V+ = 3V, V OUT = 11V, L = 33µH, C OUT = 1µF, C COMP = 0.15µF, R SENSE = 5Ω, V CTRL = 1V, T A = 0°C to +85°C , unless otherwise noted. Typical values are at T A = +25°C.)DC ELECTRICAL CHARACTERISTICS(V+ = 3V, V OUT = 11V, L = 33µH, C OUT = 1µF, C COMP = 0.15µF, R SENSE = 5Ω, V CTRL = 1V, T A = -40°C to +85°C , unless otherwise noted. (Note 1)relation using statistical quality control (SQC) methods.M A X 1848White LED Step-Up Converter in SOT234_______________________________________________________________________________________Typical Operating Characteristics(See Typical Application Circuit , V+ = 3V, I LED = 15mA, L = 33µH, C OUT = 1µF, C COMP = 0.15µF, R SENSE = 5Ω, CTRL = 1V, 2 LEDs,T A = +25°C, unless otherwise noted.)8082868488902.53.53.04.04.55.05.5EFFICIENCY vs. SUPPLY VOLTAGESUPPLY VOLTAGE (V)E F F I C I E N C Y (%)9085807570301020405060EFFICIENCY vs. LOAD CURRENTLOAD CURRENT (mA)E F F I C I E N C Y (%)SWITCHING FREQUENCY vs. SUPPLY VOLTAGESUPPLY VOLTAGE (V)S W I T C H I N G F R E Q U E N C Y (M H z )1.11.21.31.42.53.53.04.0 4.55.05.550ms/divPOWER-UP WAVEFORMSV CTRLI INI LED01V38mA015mAt RISE = 15msC COMP = 0.15μF50ms/divPOWER-UP WAVEFORMSV CTRL I INI LED01V 38mA 015mAt RISE = 110msC COMP = 1μF20μs/divSHUTDOWN WAVEFORMSV CTRLI IN I LED01V 38mA 0MAX1848 toc0615mA 02μs/divSHUTDOWN WAVEFORMSV CTRLV OUTV COMP01V6.3V 4.9V1.5VV OUT EVENTUALLY DECAYS TO V+ = 3V5ms/divLINE-TRANSIENT RESPONSEV IN V OUTI LED3.00V 3.50V6.25V 500mV/div15mA 10mA/divC COMP = 0.15μF20ms/divV CTRL TRANSIENT RESPONSEV CTRLV OUTI LED1.0V2.0V 6.7V 6.3V30mA15mAC COMP = 0.15μFMAX1848White LED Step-Up Converter in SOT23_______________________________________________________________________________________520ms/divV CTRL TRANSIENT RESPONSEV CTRLV OUTI LED1.0V2.0V 6.7V 6.3V 30mA15mAC COMP = 1μF Typical Operating Characteristics (continued)(See Typical Application Circuit , V+ = 3V, I LED = 15mA, L = 33µH, C OUT = 1µF, C COMP = 0.15µF, R SENSE = 5Ω, CTRL = 1V, 2 LEDs,T A = +25°C, unless otherwise noted.)200ns/divSWITCHING WAVEFORMSV LXI LV IN_RIPPLE6.5V 61mA17mAMAX1848 toc11V OUT_RIPPLE 10mV/div10mV/divM A X 1848Detailed DescriptionThe MAX1848’s high efficiency and small size make it ideally suited to drive series-connected LEDs. It oper-ates as a boost DC-DC converter that controls output current rather than voltage. The MAX1848 provides even illumination by sending the same output current through each LED, eliminating the need for expensive factory calibration. The fast 1.2MHz internal oscillator allows for a small inductor and small input and output capacitors while minimizing input and output ripple.The single analog control input allows easy adjustment of LED brightness and on/off control. This allows either simple logic-level on/off control or a DAC to control both brightness and on/off. In shutdown, supply current is reduced to a low 0.3µA. A programmable soft-start gradually illuminates the LEDs, reducing the inrush cur-rent during startup.Soft-StartThe MAX1848 attains soft-start by charging C COMP gradually with a constant 12µA current. When V COMP rises above 1.25V, the internal MOSFET begins switch-ing, but at a reduced duty cycle. When V COMP rises above 2.25V, the duty cycle will be at its maximum.The maximum startup time is determined by the value of C COMP . For every 0.01µF connected to COMP, thestartup time will increase by 0.833ms. The start time can be calculated by:ShutdownThe MAX1848 is put into shutdown when V CTRL is less than 100mV. In shutdown, supply current is reduced to 0.3µA by powering down the entire IC except for the CTRL voltage detection circuitry. C COMP is passively discharged during shutdown, allowing the device to re-initiate a soft-start whenever the device is enabled.When in shutdown, the internal N-channel FET does not switch, which leaves a current path between the input and the LEDs through the boost inductor and Schottky diode. The minimum forward voltage of the LED array must exceed the maximum V+ to ensure that the LEDs remain off in shutdown. Typical shutdown timing characteristics are shown in the Typical Operating Characteristics .Overvoltage ProtectionOvervoltage protection occurs when V OUT is above 13.25V. The protection circuitry stops the internal MOS-FET from switching and causes V COMP to decay to GND. The device comes out of overvoltage lockout and into soft-start when V OUT falls below 12.25V.Design ProcedureAdjusting LED CurrentAdjusting the MAX1848’s output current will change the brightness of the LEDs. An analog input (CTRL) and the sense resistor value set the output current. Output cur-rent is given by:The V CTRL voltage range for adjusting output current is 250mV to (V+ + 2V) or 5.5V, whichever is less. To set the maximum current, calculate R SENSE when V CTRL is at its maximum. Power dissipation in R SENSE is typically less than 5mW; therefore, a standard chip resistor is sufficient.Capacitor SelectionThe exact values of input and output capacitors are not critical. The typical value for the input capacitor is 3.3µF, and the typical value for the output capacitor is 1.0µF. Larger value capacitors can be used to reduce input and output ripple, but at the expense of size andhigher cost.White LED Step-Up Converter in SOT236_______________________________________________________________________________________The output current and the number of LEDs in each leg affect the capacitance of C COMP . Table 1 shows the minimum C COMP values needed to stabilize the con-verter in worst-case conditions. If further stability analy-sis is required, note that the error amplifier has 50µA/V transconductance.Inductor SelectionThe value of the inductor depends on the maximum output current to the LEDs. See Table 1 for inductance values and peak current ratings for the inductor.Schottky Diode SelectionThe MAX1848’s high-switching frequency demands a high-speed rectification diode. A Schottky diode is required due to their fast recovery time and low for-ward-voltage drop. Ensure that the diode’s average and peak current rating exceed the average output cur-rent and peak inductor current, respectively. In addi-tion, the diode’s reverse breakdown voltage mustApplications InformationConnecting Four or Six LEDsThe MAX1848 can drive one, two, or three legs of LEDs(Figure 2) as long as the total number of LEDs does not exceed six. Each leg must contain the same number of LEDs and the same sense-resistor value. Adding the second or third leg does not affect the sense-resistor value (see the Adjusting LED Current section).Three legs of two LEDs is more efficient than two legs of three LEDs (see Efficiency G raphs in the Typical Operating Characteristics ); however, a third sense resistor is needed. Multiple legs can have slight current mismatches due to component tolerances.PC Board LayoutDue to fast-switching waveforms and high-current paths, careful PC board layout is required. Protoboards and wire-wrap boards should not be used for evalua-tion. An evaluation kit (MAX1848EV kit) is available to aid design.When laying out a board, minimize trace lengths between the IC and R SENSE , the inductor, the diode,the input capacitor, and the output capacitor. Keep traces short, direct, and wide. Keep noisy traces, such as the inductor's traces, away from CS. V+’s bypass capacitor (C IN ) should be placed as close to the IC as possible. PGND and GND should be connected in only one place as close to the IC as possible. The ground connections of C IN and C OUT should be as close together as possible. The traces from V+ to the induc-tor and from the Schottky diode to the LEDs may be longer.Refer to the MAX1848 EV kit for an example of proper layout.Chip InformationTRANSISTOR COUNT: 1290MAX1848White LED Step-Up Converter in SOT237Figure 2. Six LEDs in 3 x 2 ConfigurationS O T 23, 8L .E P SM A X 1848White LED Step-Up Converter in SOT238_______________________________________________________________________________________Package Information(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information,go to /packages .)MAX1848White LED Step-Up Converter in SOT23implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 _____________________9©2005 Maxim Integrated ProductsPrinted USAis a registered trademark of Maxim Integrated Products, Inc.Package Information (continued)(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information,go to /packages .)分销商库存信息: MAXIMMAX1848ETA+T。

MAX4798ETT中文资料

General DescriptionThe MAX4795–MAX4798 family of switches feature inter-nal current limiting to prevent damage to host devices due to faulty load conditions. These analog switches have a low 0.2Ωon-resistance and operate from a 2.0V to 4.5V input voltage range. They are available with guar-anteed 450mA and 500mA current limits, making them ideal for SDIO and other load-switching applications.When the switch is on and a load is connected to the port, a guaranteed blanking time of 14ms ensures the transient voltages settle down. If after this blanking time,the load current is greater than the current limit, the MAX4795 and MAX4797 switches are turned off and FLAG is issued to the microprocessor. The switch can be turned on again by cycling the power or the ON input. The MAX4796 and MAX4798 have an autoretry feature where the switch turns off and issues a FLAG to the microprocessor after the blanking time and then contin-uously checks to see if the overload condition is pre-sent. The switch remains on after the overload condition disappears and FLAG deasserts.The MAX4795–MAX4798 are available in tiny, space-saving, 5-pin SOT23 and 6-pin TDFN (3mm x 3mm)packages.ApplicationsSDIOPDAs and Palmtop Devices Cell Phones GPS Systems Hand-Held DevicesFeatureso Guaranteed Current Limit: 450mA and 500mA o Thermal-Shutdown Protection o Reverse-Current Protection o 0.2ΩOn-Resistanceo 14ms Guaranteed Blanking Time o FLAG Functiono Autoretry (MAX4796/MAX4798)o 80µA Supply Current o 6µA Latchoff Current (MAX4795/MAX4797)o 0.01µA Shutdown Current o +2V to +4.5V Supply Rangeo Fast Current-Limit Response Time o Tiny SOT23 and TDFN Packages oUL Certification PendingMAX4795–MAX4798450mA/500mA Current-Limit Switches________________________________________________________________Maxim Integrated Products 1Ordering InformationTypical Operating Circuit19-2944; Rev 0; 8/03For pricing, delivery, and ordering information,please contact Maxim/Dallas Direct!at 1-888-629-4642, or visit Maxim’s website at .Pin Configurations*Future product—contact factory for availability.**EP = Exposed pad.Selector Guide appears at end of data sheet.M A X 4795–M A X 4798450mA/500mA Current-Limit Switches 2_______________________________________________________________________________________ABSOLUTE MAXIMUM RATINGSELECTRICAL CHARACTERISTICSStresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.Note 2:Latch-off current does not include the current flowing into FLAG .Note 3:TDFN packages are guaranteed by design.Note 4:The on-time is defined as the time taken for the current through the switch to go from 0mA to full load. The off-time is defined as the time taken for the current through the switch to go from full load to 0mA.Note 5:Retry time is typically 15 times the blanking time.IN, ON, FLAG , OUT to GND.....................................-0.3V to +6V OUT Short Circuit to GND.................................Internally Limited Continuous Power Dissipation (T A = +70°C)5-Pin SOT23 (derate 7.1mW/°C above +70°C)............571mW 6-Pin TDFN (derate 24.4mW/°C above +70°C).........1951mWOperating Temperature Range ...........................-40°C to +85°C Junction Temperature......................................................+150°C Storage Temperature Range.............................-65°C to +150°C Lead Temperature (soldering, 10s).................................+300°CMAX4795–MAX4798450mA/500mA Current-Limit Switches_______________________________________________________________________________________3204060801001201401602.0 2.5 3.0 3.5 4.0 4.5QUIESCENT SUPPLY CURRENTvs. SUPPLY VOLTAGESUPPLY VOLTAGE (V)S U P P L Y C U R R E N T (µA )5060807090100-4010-15356085SUPPLY CURRENT vs. TEMPERATURETEMPERATURE (°C)S U P P L Y C U R R E N T (µA )032145678910LATCH-OFF CURRENT vs. TEMPERATURETEMPERATURE (°C)L A T C H -O F FC U R R E N T (µA )-4010-15356085100-40-15103560851010.10.010.001SHUTDOWN SUPPLY CURRENTvs. TEMPERATUREM A X 4795 t o c 04TEMPERATURE (°C)S H U T D O W N S U P P L Y C U R R E N T (n A )SHUTDOWN LEAKAGE CURRENTvs. TEMPERATURE-40-15103560851010.10.010.001TEMPERATURE (°C)S H U T D O W N S U P P L Y C U R R E N T (n A )LATCH-OFF LEAKAGE CURRENTvs. TEMPERATUREM A X 4795 t o c 06-40-15103560851010010.10.010.0010.0001TEMPERATURE (°C)L A T C H -O F F L E A K A G E C U R R E N T (n A )10-40-151035608510.10.010.0010.0001SHUTDOWN REVERSE LEAKAGE CURRENTvs. TEMPERATURETEMPERATURE (°C)S H U T D O W N L E A K A G E C U R R E N T (n A )0.40.20.80.61.21.01.4-4010-15356085NORMALIZED ON-RESISTANCEvs. TEMPERATUREM A X 4795 t o c 08TEMPERATURE (°C)N O R M A L I Z E D R O N (Ω)200100500400300600700900800100000.60.90.3 1.2 1.5 1.8 2.1 2.4 2.7 3.0 3.3OUTPUT CURRENT vs. OUTPUT VOLTAGEV IN - V OUT (V)O U T P U T C U R R E N T (m A )Typical Operating Characteristics(V IN = 3.3V, T A = +25°C, unless otherwise noted.)M A X 4795–M A X 4798450mA/500mA Current-Limit Switches 4_______________________________________________________________________________________FORWARD CURRENT LIMIT vs. SUPPLY VOLTAGESUPPLY VOLTAGE (V)F O R W A R D C U R R E N T L I M I T (m A )4.03.53.02.55255505756006256505002.04.5SWITCH TURN-ON/OFF TIMESvs. TEMPERATURE-40-151035608510001001010.10.010.001TEMPERATURE (°C)T U R N -O N /O F F T I M E S (µs )20253530404550-4010-15356085FLAG-BLANKING TIMEOUT vs. TEMPERATUREM A X 4795 t o c 12TEMPERATURE (°C)F L AG -B L A N K I N G T I M E O U T (m s )0V 0V3.3V0V 3.3V V IN = 3.3V C OUT = 1µF C IN = 1µF V SEL = 3.3V 40µs/divV IN 2V/div V ON 2V/div I OUT200mA/divMAX4797/MAX4798CURRENT-LIMIT RESPONSE0V3V0VV IN = V ON C OUT = 1µF C IN = 1µF 40µs/divV IN = V ON 1V/divI OUT200mA/divMAX4797/MAX4798CURRENT-LIMIT RESPONSE0V3.3V3.3V0V0V 4µs/divV IN 2V/divV OUT 2V/divI OUT 5A/divCURRENT-LIMIT RESPONSE (OUT SHORTED TO GND)C IN = 1µF C OUT = 1µF0V0V 3V 3V 0V 200µs/divV IN 2V/div V OUT 2V/divI OUT 1A/divMAX4797/MAX4798REVERSE CURRENT LIMITMAX4795 toc16C IN = 1µF C OUT = 1µF0V3V0V20µs/divV ON 1V/divI OUT10mA/divSWITCH TURN-ON TIME RESPONSEMAX4795 toc17V IN = 3.3VTypical Operating Characteristics (continued)(V IN = 3.3V, T A = +25°C, unless otherwise noted.)MAX4795–MAX4798450mA/500mA Current-Limit Switches_______________________________________________________________________________________5Pin DescriptionFigure 1. Functional Diagram0V0V3.3V40ns/divV ON 1V/divI OUT10mA/divSWITCH TURN-OFF TIME RESPONSEMAX4795 toc18Typical Operating Characteristics (continued)(V IN = 3.3V, T A = +25°C, unless otherwise noted.)0V0V 0V0V 3.3V3.3V3.3V 10ms/divV IN 2V/divV OUT 2V/divV FLAG 2V/div I OUT500mA/divMAX4797/MAX4798FLAG-BLANKING RESPONSE (OVERLOAD CONDITION)MAX4795 toc19V IN = 3.3V C IN = 1µF C OUT = 1µFM A X 4795–M A X 4798450mA/500mA Current-Limit Switches 6_______________________________________________________________________________________Detailed DescriptionThe MAX4795–MAX4798 are forward/reverse current-limited switches that operate from a 2V to 4.5V input voltage range and guarantee a 450mA and 500mA minimum current-limit threshold for different options.The voltage drop across an internal sense resistor is compared to two reference voltages to indicate a for-ward or reverse current-limit fault. When the load cur-rent exceeds the preset current limit for greater than the fault-blanking time, the switch opens.The MAX4796 and MAX4798 have an autoretry function that turns on the switch again after an internal retry time expires. If the faulty load condition is still present after the blanking time, the switch turns off again and the cycle is repeated. If the faulty load condition is not pre-sent, the switch remains on.The MAX4795 and MAX4797 do not have the autoretry option and the switch remains in latch-off mode until the ON pin or the input power is cycled from high to low and then high again.Reverse-Current ProtectionThe MAX4795–MAX4798limit the reverse current (V OUT to V IN ) from exceeding the maximum I REV value. The switch is shut off and FLAG is asserted if the reverse current-limit condition persists for more than the blanking time. This feature prevents excessive reverse currents from flowing through the device.Switch-On/Off ControlToggle ON high to enable the current-limited switches.The switches are continuously on if there is no fault.When a forward/reverse current fault is present or the die exceeds the thermal-shutdown temperature of +150°C,OUT is internally disconnected from IN and the supply current decreases to 8µA (latch off). The switch is now operating in one of its off states. The switch-off state also occurs when driving ON low, thus reducing the supply current (shutdown) to 0.01µA. Table 1 illustrates the ON/OFF state of the MAX4795–MAX4798 current-limit switches.FLAG IndicatorThe MAX4795–MAX4798 feature a latched output (FLAG).Whenever an overcurrent condition is encountered, the MAX4795/MAX4797 latch FLAG low and turn the switch off. The MAX4796/MAX4798 latch FLAG low and keep it low until the overcurrent condition is removed.During this time, the switch cycles on and off in the autoretry mode. When the overcurrent condition is removed, FLAG deasserts and the switch turns on (Figure 2). FLAG is an open-drain output transistor and requires an external pullup resistor from FLAG to IN.During shutdown (ON is low), the pulldown on FLAG output is released to limit power dissipation. FLAG goes low when any of the following conditions occur:•The die temperature exceeds the thermal-shutdown temperature limit of +150°C.•The device is in current limit for more than the fault-blanking period.•The switch is in autoretry.Figure 2. MAX4796/MAX4798 Autoretry Fault-Blanking DiagramTable 1. MAX4795–MAX4798 Switch Truth TableMAX4795–MAX4798450mA/500mA Current-Limit Switches_______________________________________________________________________________________7Autoretry (MAX4796/MAX4798)When the forward or reverse current-limit threshold is exceeded, t BLANK timer begins counting (Figure 2).The timer resets if the overcurrent condition disappears before t BLANK has elapsed. A retry time delay, t RETRY ,is started immediately after t BLANK has elapsed and during that time, the switch is latched off and FLAG asserts. At the end of t RETRY , the switch is turned on again. If the fault still exists, the cycle is repeated. If the fault has been removed, the switch stays on and FLAG deasserts.The autoretry feature saves system power in the case of an overcurrent or short-circuit condition. During t BLANK , when the switch is on, the supply current is at the current limit. During t RETRY , when the switch is off,the current through the switch is zero. Instead of observing the full load current, the switch sees the equivalent load current times duty cycle or I SUPPLY =I LOAD ✕t BLANK /(t BLANK + t RETRY ). With a typical t BLANK = 37ms and typical t RETRY = 555ms, the duty cycle is 6%, which results in a 94% power savings over the switch being on the entire time. The duty cycle is consistent across the process and devices.Latchoff (MAX4795/MAX4797)When the forward or reverse current-limit threshold is exceeded, t BLANK timer begins counting. The timer resets if the overcurrent condition disappears before t BLANK has elapsed. The switch is shut off and FLAG asserts if the overcurrent condition continues up to the end of the blanking time. Reset the switch by either tog-gling ON (Figure 3) or cycling the input voltage.Fault BlankingThe MAX4795–MAX4798feature 14ms (min) fault blank-ing. Fault blanking allows current-limit faults, including momentary short-circuit faults that occur when hot swapping a capacitive load, and also ensures that no fault is issued during power-up. When a load transient causes the device to enter current limit, an internal counter starts. If the load-transient fault persists beyond the fault-blanking timeout, FLAG asserts low. Load-tran-sient faults less than t BLANK do not cause a FLAG out-put assertion. Only current-limit faults are blanked.A thermal fault causes FLAG to assert immediately and does not wait for the blanking time.Thermal ShutdownThe MAX4795–MAX4798 have a thermal-shutdown fea-ture to protect the devices from overheating. The switchturns off and FLAG goes low immediately (no fault blanking) when the junction temperature exceeds +150°C. The switches with autoretry turn back on when the device temperature drops approximately 15°C. The switches with latchoff require ON cycling.Applications InformationInput CapacitorTo limit the input voltage drop during momentary output short-circuit conditions, connect a capacitor from IN to GND. A 0.1µF ceramic capacitor is adequate for most applications; however, higher capacitor values further reduce the voltage drop at the input and are recom-mended for lower voltage applications.Figure 3. MAX4795/MAX4797 Latch-Off Fault BlankingM A X 4795–M A X 4798Output CapacitanceConnect a 0.1µF capacitor from OUT to GND. This capacitor helps prevent inductive parasitics from pulling OUT negative during turn off, thus preventing the MAX4795–MAX4798 from tripping erroneously. If the load capacitance is too large, then current may not have enough time to charge the capacitor and the device assumes that there is a faulty load condition.The maximum capacitive load value that can be driven from OUT is obtained by the following formula:Layout and Thermal DissipationTo optimize the switch response time to output short-circuit conditions, it is very important to keep all traces as short as possible to reduce the effect of undesirable parasitic inductance. Place input and output capacitors as close as possible to the device (no more than 5mm).IN and OUT pins must be connected with short traces to the power bus.During normal operation, the power dissipation is small and the package temperature change is minimal. If the output is continuously shorted to ground at the maxi-mum supply voltage, the operation of the switches with the autoretry option does not cause problems because the total power dissipated during the short is scaled by the duty cycle:where V IN = 4.5V, I OUT = 750mA, t BLANK = 14ms, and t RETRY = 210ms.Attention must be given to the MAX4795 and MAX4797where the latchoff condition must be manually reset by toggling ON from high to low. If the latchoff time dura-tion is not sufficiently high, it is possible for the device to reach the thermal-shutdown threshold and never beable to turn the device on until it cools down.450mA/500mA Current-Limit Switches 8_______________________________________________________________________________________Chip InformationTRANSISTOR COUNT: 2539PROCESS: BiCMOSMAX4795–MAX4798450mA/500mA Current-Limit SwitchesMa xim ca nnot a ssume responsibility for use of a ny circuitry other tha n circuitry entirely embodied in a Ma xim product. No circuit pa tent licenses a re implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 _____________________9©2003 Maxim Integrated ProductsPrinted USAis a registered trademark of Maxim Integrated Products.Package Information(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information,go to /packages .)。

MAX6387XS18D7中文资料

MAX6387XS18D7中⽂资料General Description The MAX6381–MAX6390 microprocessor (µP) supervisory circuits monitor power-supply voltages from +1.8V to +5.0V while consuming only 3µA of supply current at +1.8V. Whenever V CC falls below the factory-set reset thresholds, the reset output asserts and remains assert-ed for a minimum reset timeout period after V CC rises above the reset threshold. Reset thresholds are available from +1.58V to +4.63V, in approximately 100mV incre-ments. Seven minimum reset timeout delays ranging from 1ms to 1200ms are available.The MAX6381/MAX6384/MAX6387 have a push-pull active-low reset output. The MAX6382/MAX6385/ MAX6388 have a push-pull active-high reset output, and the MAX6383/MAX6386/MAX6389/MAX6390 have an open-drain active-low reset output. The MAX6384/MAX6385/MAX6386 also feature a debounced manual reset input (with internal pullup resistor). The MAX6387/MAX6388/MAX6389 have an auxiliary input for monitoring a second voltage. The MAX6390 offers a manual reset input with a longer V CC reset timeout period (1120ms or 1200ms) and a shorter manual reset timeout (140ms or 150ms). The MAX6381/MAX6382/MAX6383 are available in 3-pin SC70 and6-pinµDFN packages and the MAX6384–MAX6390 are available in 4-pin SC70 andFeaturesFactory-Set Reset Threshold Voltages Rangingfrom +1.58V to +4.63V in Approximately 100mVIncrements±2.5% Reset Threshold Accuracy OverTemperature (-40°C to +125°C)Seven Reset Timeout Periods Available: 1ms,20ms, 140ms, 280ms, 560ms, 1120ms,1200ms (min)3 Reset Output OptionsActive-Low Push-PullActive-High Push-PullActive-Low Open-DrainReset Output State Guaranteed ValidDown to V CC= 1VManual Reset Input (MAX6384/MAX6385/MAX6386)Auxiliary RESET IN(MAX6387/MAX6388/MAX6389)V CC Reset Timeout (1120ms or 1200ms)/ManualReset Timeout (140ms or 150ms) (MAX6390)Negative-Going V CC Transient ImmunityLow Power Consumption of 6µA at +3.6Vand 3µA at +1.8VPin Compatible withMAX809/MAX810/MAX803/MAX6326/MAX6327/MAX6328/MAX6346/MAX6347/MAX6348,and MAX6711/MAX6712/MAX6713Tiny 3-Pin/4-Pin SC70 and 6-Pin µDFN PackagesMAX6381–MAX6390 SC70/µDFN, Single/Dual Low-Voltage,Low-Power µP Reset Circuits ________________________________________________________________Maxim Integrated Products1Pin Configurations19-1839; Rev 4; 4/07Ordering InformationOrdering Information continued at end of data sheet.Typi cal Operati ng Ci rcui t appears at end of data sheet.Selector Guide appears at end of data sheet.after "XR", "XS", or "LT." Insert reset timeout delay (see ResetTimeout Delay table) after "D" to complete the part number.Sample stock is generally held on standard versions only (seeStandard Versions table). Standard versions have an orderincrement requirement of 2500 pieces. Nonstandard versionshave an order increment requirement of 10,000 pieces.Contact factory for availability of nonstandard versions.+Denotes a lead-free package.For pricing, delivery, and ordering information,please contact Maxim Direct at 1-888-629-4642,or visit Maxim’s website at /doc/5700977901f69e3143329415.html .ComputersControllersIntelligent InstrumentsCritical µP and µCPower MonitoringPortable/Battery-Powered EquipmentDual Voltage SystemsM A X 6381–M A X 6390SC70/µDFN, Single/Dual Low-Voltage, Low-Power µP Reset CircuitsABSOLUTE MAXIMUM RATINGSELECTRICAL CHARACTERISTICS(V CC = full range, T A = -40°C to +125°C, unless otherwise specified. Typical values are at T A = +25°C.) (Note 1)Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.V CC to GND..........................................................-0.3V to +6.0V RESET Open-Drain Output....................................-0.3V to +6.0V RESET , RESET (push-pull output)..............-0.3V to (V CC + 0.3V)MR , RESET IN.............................................-0.3V to (V CC + 0.3V)Input Current (V CC ).............................................................20mA Output Current (all pins).....................................................20mAContinuous Power Dissipation (T A = +70°C)3-Pin SC70 (derate 2.9mW/°C above +70°C)..............235mW 4-Pin SC70 (derate 3.1mW/°C above +70°C)..............245mW 6-Pin µDFN (derate 2.1mW/°C above +70°C)..........167.7mW Operating Temperature Range .........................-40°C to+125°C Storage Temperature Range.............................-65°C to +150°C Lead Temperature (soldering,10s).................................+300°CMAX6381–MAX6390SC70/µDFN, Single/Dual Low-Voltage,Low-Power µP Reset Circuits_______________________________________________________________________________________3M A X 6381–M A X 6390SC70/µDFN, Single/Dual Low-Voltage, Low-Power µP Reset Circuits4______________________________________________________________________________________Typical Operating Characteristics(T A = +25°C, unless otherwise noted.)215436789-40-105-25203550658095110125SUPPLY CURRENT vs. TEMPERATURE(NO LOAD)TEMPERATURE (°C)S U P P L Y C U R R E N T (µA )25292735333137394143-40-105-25203550658095110125POWER-DOWN RESET DELAYvs. TEMPERATURETEMPERATURE (°C)P O W E R -D O W N R E S E T D E L A Y (µs )0.940.980.961.021.001.061.041.08-40-10520-253550658095110125 NORMALIZED POWER-UP RESET TIMEOUTvs. TEMPERATUREM A X 6381/90 t o c 03TEMPERATURE (°C)N O R M A L I Z E D R E S E T T I M E O U T P E R I O D0.9900.9851.0150.9950.9901.0001.0051.0101.020-40-10520-253550958011065125 M A X 6381/90 t o c 04TEMPERATURE (°C)N O R M A L I Z E D R E S E T TH R E S H O L D NORMALIZED RESET THRESHOLDvs. TEMPERATURE00.40.20.80.61.01.2063912OUTPUT-VOLTAGE LOW vs. SINK CURRENTI SINK (mA)V O L (V )01.00.52.01.52.53.00500750250100012501500OUTPUT-VOLTAGE HIGH vs. SOURCE CURRENTI SOURCE (µA)V O H (V )45001100010010MAXIMUM TRANSIENT DURATION vs. RESET COMPARATOR OVERDRIVE15050350250500200100400300RESET COMPARATOR OVERDRIVE, V TH - V CC (mV)M A X I M U M T R A N S I E N T D U R A T I O N (µs )3.53.93.74.54.34.14.74.95.35.15.5-40-105-25203550658095110125RESET IN TO RESET DELAYvs. TEMPERATUREM A X 6381/90 t o c 08TEMPERATURE (°C)R E S E T I N D E L A Y (µs )MAX6381–MAX6390SC70/µDFN, Single/Dual Low-Voltage,Low-Power µP Reset CircuitsPin DescriptionM A X 6381–M A X 6390SC70/µDFN, Single/Dual Low-Voltage, Low-Power µP Reset Circuits6_______________________________________________________________________________________ Detailed DescriptionRESET OutputA µP reset input starts the µP in a known state. These µP supervisory circuits assert reset to prevent code execution errors during power-up, power-down, or brownout conditions.Reset asserts when V CC is below the reset threshold;once V CC exceeds the reset threshold, an internal timer keeps the reset output asserted for the reset timeout period. After this interval, reset output deasserts. Reset output is guaranteed to bein the correct logic state for V CC ≥1V.Manual Reset Input (MAX6384/MAX6385/MAX6386/MAX6390)Many µP-based products require manual reset capabil-ity, allowing the operator, a test technician, or external logic circuitry to initiate a reset. A logic low on MR asserts reset. Reset remains asserted while MR is low,and for the reset active timeout period (t RP ) after MR returns high. This input has an internal 63k ?pullup resistor (1.56k ?for MAX6390), so it can be left uncon-nected if it is not used. MR can be driven with TTL or CMOS logic levels, or with open-drain/collector outputs.Connect a normally open momentary switch from MR to G ND to create a manual-reset function; external debounce circuitry is not required. If MR is driven from long cables or if the device is used in a noisy environ-ment, connecting a 0.1µF capacitor from MR to G ND provides additional noise immunity.RESET IN Comparator(MAX6387/MAX6388/MAX6389)RESET IN is compared to an internal +1.27V reference.If the voltage at RESET IN is less than 1.27V, reset asserts. Use the RESET IN comparator as a user-adjustable reset detector or as a secondary power-sup-ply monitor by implementing a resistor-divider at RESET IN (shown in Figure 1). Reset asserts when either V CC or RESET IN falls below its respective threshold volt-age. Use the following equation to set the threshold:V INTH = V THRST (R1/R2 + 1)where V THRST = +1.27V. To simplify the resistor selec-tion, choose a value of R2 and calculate R1:R1 = R2 [(V INTH /V THRST ) - 1]Since the input current at RESET IN is 50nA (max),large values can be used for R2 with no significant loss in accuracy.___________Applications InformationNegative-Going V CC TransientsIn addition to issuing a reset to the µP during power-up,power-down, and brownout conditions, the MAX6381–MAX6390 are relatively immune to short dura-tion negative-going V CC transients (glitches).The Typical Operating Characteristics section shows the Maximum Transient Durations vs. Reset Comparator Overdrive, for which the MAX6381–MAX6390 do not generate a reset pulse. This graph was generated usinga negative-going pulse applied to V CC , starting above the actual reset threshold and ending below it by the magnitude indicated (reset comparator overdrive). The graph indicates the typical maximum pulse width a neg-ative-going V CC transient may have without causing a reset pulse to be issued. As the magnitude of the tran-sient increases (goes farther below the reset threshold),the maximum allowable pulse width decreases. A 0.1µF capacitor mounted as close as possible to V CC provides additional transient immunity.Ensuring a Valid RESET Output Down to V CC = 0VThe MAX6381–MAX6390 are guaranteed to operate properly down to V CC = 1V. In applications that require valid reset levels down to V CC = 0V, a pulldown resistor to active-low outputs (push/pull only, Figure 2) and a pullup resistor to active-high outputs (push/pull only)will ensure that the reset line is valid while the reset out-put can no longer sink or source current. This schemedoes not work with the open-drain outputs of the MAX6383/MAX6386/MAX6389/MAX6390. The resistor value used is not critical, but it must be small enough not to load the reset output when V CC is above the reset threshold. For most applications, 100k ?is ade-quate.MAX6381–MAX6390SC70/µDFN, Single/Dual Low-Voltage,Low-Power µP Reset Circuits_______________________________________________________________________________________7M A X 6381–M A X 6390SC70/µDFN, Single/Dual Low-Voltage, Low-Power µP Reset Circuits 8_______________________________________________________________________________________ Selector GuideOrdering Information (continued)Note:Insert reset threshold suffix (see Reset Threshold table)after "XR", "XS", or "LT." Insert reset timeout delay (see Reset Timeout Delay table) after "D" to complete the part number.Sample stock is generally held on standard versions only (see Standard Versions table). Standard versions have an order increment requirement of 2500 pieces. Nonstandard versions have an order increment requirement of 10,000 pieces.Contact factory for availability of nonstandard versions.*MAX6390 is available with D4 or D7 timing only.+Denotes a lead-free package.MAX6381–MAX6390SC70/µDFN, Single/Dual Low-Voltage,Low-Power µP Reset Circuits_______________________________________________________________________________________9Chip InformationTRANSISTOR COUNT: 647PROCESS: BiCMOSPin Configurations (continued)M A X 6381–M A X 6390SC70/µDFN, Single/Dual Low-Voltage, Low-Power µP Reset Circuits10______________________________________________________________________________________ Package Information(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information,go to /doc/5700977901f69e3143329415.html /packages .)MAX6381–MAX6390SC70/µDFN, Single/Dual Low-Voltage,Low-Power µP Reset Circuits______________________________________________________________________________________11Package Information (continued)(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information,go to /doc/5700977901f69e3143329415.html /packages .)M A X 6381–M A X 6390SC70/µDFN, Single/Dual Low-Voltage, Low-Power µP Reset Circuits12______________________________________________________________________________________ Package Information (continued)(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information,go to /doc/5700977901f69e3143329415.html /packages .)SC70/µDFN, Single/Dual Low-Voltage,Low-Power µP Reset CircuitsMaxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600____________________13?2007 Maxim Integrated Productsis a registered trademark of Maxim Integrated Products, Inc.MAX6381–MAX6390Package Information (continued)(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information,go to /doc/5700977901f69e3143329415.html /packages .)Revision HistoryPages changed at Rev 4: Title on all pages, 1, 2, 5,7–13。

MAX5489ETE-T中文资料

MAX5489ETE-T中⽂资料General DescriptionThe MAX5487/MAX5488/MAX5489 dual, linear-taper,digital potentiometers function as mechanical poten-tiometers with a simple 3-wire SPI?-compatible digital interface that programs the wipers to any one of 256tap positions. These digital potentiometers feature a nonvolatile memory (EEPROM) to return the wipers to their previously stored positions upon power-up.The MAX5487 has an end-to-end resistance of 10k Ω,while the MAX5488 and MAX5489 have resistances of 50k Ωand 100k Ω, respectively. These devices have a low 35ppm/°C end-to-end temperature coefficient, and operate from a single+2.7V to +5.25V supply.The MAX5487/MAX5488/MAX5489 are available in 16-pin 3mm x 3mm x 0.8mm thin QFN or 14-pin TSSOP packages. Each device is guaranteed over the extend-ed -40°C to +85°C temperature range.ApplicationsLCD Screen Adjustment Audio Volume ControlMechanical Potentiometer Replacement Low-Drift Programmable FiltersLow-Drift Programmable-Gain AmplifiersFeaturesWiper Position Stored in Nonvolatile Memory (EEPROM) and Recalled Upon Power-Up or Recalled by an Interface Command ?3mm x 3mm x 0.8mm, 16-Pin Thin QFN or 14-Pin TSSOP Packages ?±1 LSB INL, ±0.5 LSB DNL (Voltage-Divider Mode)?256 Tap Positions35ppm/°C End-to-End Resistance Temperature Coefficient 5ppm/°C Ratiometric Temperature Coefficient 10k Ω, 50k Ω, and 100k ΩEnd-to-End Resistance Values ?SPI-Compatible Serial Interface ?Reliability200,000 Wiper Store Cycles 50-Year Wiper Data Retention+2.7V to +5.25V Single-Supply OperationMAX5487/MAX5488/MAX5489Linear-Taper Digital Potentiometers________________________________________________________________Maxim Integrated Products119-3478; Rev 3; 1/07For pricing, delivery, and ordering information,please contact Maxim/Dallas Direct!at 1-888-629-4642, or visit Maxim’s website at /doc/010aa430376baf1ffc4fadca.html .SPI is a trademark of Motorola, Inc.Ordering Information/Selector Guide**Future product—contact factory for availabilty .Functional DiagramM A X 5487/M A X 5488/M A X 5489Dual, 256-Tap, Nonvolatile, SPI-Interface,Linear-Taper Digital Potentiometers2_______________________________________________________________________________________ ABSOLUTE MAXIMUM RATINGSStresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.V DD to GND...........................................................-0.3V to +6.0V All Other Pinsto GND......................-0.3V to the lower of (V DD + 0.3V) and +6.0V Maximum Continuous Current into H_, W_, and L_ MAX5487......................................................................±5.0mA MAX5488......................................................................±1.3mA MAX5489......................................................................±0.6mAContinuous Power Dissipation (T A = +70°C)16-Pin Thin QFN (derate 17.5mW/°C above +70°C).....1398mW 14-Pin TSSOP (derate 9.1mW/°C above+70°C).............727mW Operating Temperature Range ...........................-40°C to +85°C Junction Temperature......................................................+150°C Storage Temperature Range.............................-60°C to +150°C Lead Temperature (soldering, 10s).................................+300°CDC ELECTRICAL CHARACTERISTICSMAX5487/MAX5488/MAX5489Dual, 256-Tap, Nonvolatile, SPI-Interface,Linear-Taper Digital Potentiometers_______________________________________________________________________________________3DC ELECTRICAL CHARACTERISTICS (continued)(V DD = +2.7V to +5.25V, V H = V DD , V L = GND, T A = -40°C to +85°C, unless otherwise noted. Typical values are at V DD = +5.0V, T A = +25°C, unless otherwise noted.) (Note 1)M A X 5487/M A X 5488/M A X 5489Dual, 256-Tap, Nonvolatile, SPI-Interface,Linear-Taper Digital Potentiometers4_______________________________________________________________________________________Note 2:DNL and INL are measured with the potentiometer configured as a voltage-divider with H_ = V DD and L_ = 0. The wiper terminalis unloaded and measured with an ideal voltmeter.Note 3:DNL and INL are measured with the potentiometer configured as a variable resistor. H_ is unconnected and L_ = 0. For V DD =+5V, the wiper terminal is driven with a source current of 400µA for the 10k Ωconfiguration, 80µA for the 50kΩconfiguration,and 40µA for the 100k Ωconfiguration. For VNote 4:The wiper resistance is the worst value measured by injecting the currents given in Note 3 into W_ with L_ = GND. R W =(V W - V H ) / I W .Note 5:The device draws higher supply current when the digital inputs are driven with voltages between (V DD - 0.5V) and (GND +0.5V). See Supply Current vs. Digital Input Voltage in the Typical Operating Characteristics section.Note 6:Wiper at midscale with a 10pF load.Note 7:Wiper-settling time is the worst-case 0-to-50% rise time, measured between tap 0 and tap 127. H_ = V DD , L_ = GND, andthe wiper terminal is unloaded and measured with a 10pF oscilloscope probe (see Tap-to-Tap Switching Transient in the Typical Operating Characteristics section).Note 8:Digital timing is guaranteed by design and characterization, and is not production tested.DC ELECTRICAL CHARACTERISTICS (continued)(V DD = +2.7V to +5.25V, V H = V DD , V L = GND, T A = -40°C to +85°C, unless otherwise noted. Typical values are at V DD = +5.0V, T A = +25°C, unless otherwise noted.) (Note 1)Figure 1. Voltage-Divider/Variable-Resistor ConfigurationsMAX5487/MAX5488/MAX5489Dual, 256-Tap, Nonvolatile, SPI-Interface,Linear-Taper Digital Potentiometers_______________________________________________________________________________________50.10-40-20204060800.50.40.30.20.6TEMPERATURE (°C)S U P P L Y C U R R E N T (µA )SUPPLY CURRENT vs. TEMPERATURESUPPLY CURRENTvs. DIGITAL INPUT VOLTAGEDIGITAL INPUT VOLTAGE (V)S U P P L Y C U R R E N T (µA )21110100100010,000005050150100200250649632128160192224256WIPER RESISTANCE vs. TAP POSITION M A X5487-89 t o c 03TAP POSITIONW I P E R R E S I S T A N C E (Ω)1µs/div TAP-TO-TAP SWITCHING TRANSIENT(MAX5487)CS 2.0V/divWIPER 20mV/divTAP-TO-TAP SWITCHING TRANSIENT(MAX5488)1.0µs/divWIPER 20mV/divWIPER TRANSIENT AT POWER-ON2.0µs/divWIPER2.0V/divV H_ = V DDV DD 2.0V/divFREQUENCY (kHz)G A I N (d B )MIDSCALE FREQUENCY RESPONSE(MAX5487)0TAP-TO-TAP SWITCHING TRANSIENT(MAX5489)1.0µs/divWIPER 20mV/divCS 2.0V/divTypical Operating Characteristics(V DD = +5.0V, T A = +25°C, unless otherwise noted.)M A X 5487/M A X 5488/M A X 5489Dual, 256-Tap, Nonvolatile, SPI-Interface,Linear-Taper Digital Potentiometers6_______________________________________________________________________________________ VARIABLE-RESISTOR INL vs. TAP POSITION (MAX5488)M A x 5487-89 t o c 12TAP POSITIONI N L (L S B )224192326496128160-0.6-0.8-0.4-0.200.20.4-0.10-0.150-0.050.050.100.150.200649632128160192224256VOLTAGE-DIVIDER DNL vs. TAP POSITION (MAX5487) TAP POSITION D N L (L S B )VOLTAGE-DIVIDER DNL vs. TAP POSITION (MAX5488) M A x 5487-89 t o c 15TAP POSITION D N L (L S B )224192326496128160-0.15-0.10-0.0500.050.100.150.20-0.20256VOLTAGE-DIVIDER INL vs. TAP POSITION (MAX5488)M A x 5487-89 t o c 16TAP POSITIONI N L (L S B )224192326496128160-0.6-0.8-0.4-0.200.20.40.60.81.0-1.02560.60.20.40.200.60.40.81.21.01.40649632128160192224256VOLTAGE-DIVIDER INL vs. TAP POSITION (MAX5487)TAP POSITIONI N L (L S B)Typical Operating Characteristics (continued)(V DD = +5.0V, T A = +25°C, unless otherwise noted.)MIDSCALE FREQUENCY RESPONSE(MAX5488)FREQUENCY (kHz)G A I N (d B )100101-45-40-35-30-25-20-15-10-50-50MIDSCALE FREQUENCY RESPONSE(MAX5489)FREQUENCY (kHz)G A I N (d B )100101-45-40-35-30-25-20-15-10-50-500.11000VARIABLE-RESISTOR DNL vs. TAP POSITION (MAX5488)M A x 5487-89 t o c 11TAP POSITIOND N L (L S B )224192326496128160-0.15-0.10-0.0500.050.100.150.20-0.200256MAX5487/MAX5488/MAX5489Dual, 256-Tap, Nonvolatile, SPI-Interface,Linear-Taper Digital Potentiometers_______________________________________________________________________________________7 VARIABLE-RESISTOR DNL vs. TAP POSITION (MAX5489)M A x 5487-89 t o c 17TAP POSITION D N L (L S B )224192326496128160-0.15-0.10-0.0500.050.100.150.20-0.20256VOLTAGE-DIVIDER INL vs. TAP POSITION (MAX5489)M A x 5487-89 t o c 20TAP POSITIONI N L (L S B )22419232128160-0.6-0.8-0.4-0.200.20.40.60.81.0-1.0256VARIABLE-RESISTOR INL vs. TAP POSITION (MAX5489)M A x 5487-89 t o c 18TAP POSITION I N L (L S B )224192326496128160-0.6-0.8-0.4-0.200.20.40.60.81.0-1.00256VOLTAGE-DIVIDER DNL vs. TAP POSITION (MAX5489)M A x 5487-89 t o c 19TAP POSITIOND N L (L S B )224192326496128160-0.15-0.10-0.0500.050.100.150.20-0.200256-0.010-0.004-0.006-0.008-0.00200.0020.0040.0060.0080.010-4010-15356085END-TO-END RESISTANCE CHANGE vs. TEMPERATURE (MAX5487) M A X 5487-89 t o c 22TEMPERATURE (°C)R E S I S T A N C EC H A N G E (%)-100-80-90-60-70-40-50-30CROSSTALK vs. FREQUENCYFREQUENCY (kHz)C R O S S T A L K (d B )0.11101001000-0.010-0.004-0.006-0.008-0.00200.0020.0040.0060.0080.010-4010-1585END-TO-END RESISTANCE CHANGE vs. TEMPERATURE (MAX5488)M A X 5487-89 t o c 23TEMPERATURE (°C)R E S I S T A N C E C H A N G E (%)-0.010-0.004-0.006-0.008-0.00200.0020.0040.0060.0080.010-4010-15356085END-TO-END RESISTANCE CHANGE vs. TEMPERATURE (MAX5489)M A X 5487-89 t o c 24TEMPERATURE (°C)R E S I S T A N C E C H A N G E (%)Typical Operating Characteristics (continued)(V DD = +5.0V, T A = +25°C, unless otherwise noted.)M A X 5487/M A X 5488/M A X 5489Dual, 256-Tap, Nonvolatile, SPI-Interface,Linear-Taper Digital Potentiometers 8_______________________________________________________________________________________Detailed DescriptionThe MAX5487/MAX5488/MAX5489 contain two resistor arrays, with 255 resistive elements each. The MAX5487has an end-to-end resistance of 10k Ω, while the MAX5488 and MAX5489 have resistances of 50k Ωand 100k Ω, respectively. The MAX5487/MAX5488/MAX5489allow access to the high, low, and wiper terminals on both potentiometers for a standard voltage-divider con-figuration. Connect the wiper to the high terminal, and connect the low terminal to ground, to make the device a variable resistor (see Figure 1).A simple 3-wire serial interface programs either wiper directly to any of the 256 tap points. The nonvolatile memory stores the wiper position prior to power-down and recalls the wiper to the same point upon power-up or by using an interface command (see Table 1). The nonvolatile memory is guaranteed for 200,000 wiper store cycles and 50 years for wiper data retention.SPI Digital InterfaceThe MAX5487/MAX5488/MAX5489 use a 3-wire SPI-compatible serial data interface (Figures 2 and 3). This write-only interface contains three inputs: chip-select(CS ), data clock (SCLK), and data in (DIN). Drive CS low to enable the serial interface and clock data synchro-nously into the shift register on each SCLK rising edge.The WRITE commands (C1, C0 = 00 or 01) require 16clock cycles to clock in the command, address, and data (Figure 3a). The COPY commands (C1, C0 = 10, 11) can use either eight clock cycles to transfer only command and address bits (Figure 3b) or 16 clock cycles, with the device disregarding 8 data bits (Figure 3a). After loading data into the shift register, drive CS high to latch the data into the appropriate potentiometer control register and disable the serial interface. Keep CS low during the entire serial data stream to avoid cor-ruption of the data.Digital-Interface FormatThe data format consists of three elements: command bits, address bits, and data bits (see Table 1 and Figure 3). The command bits (C1 and C0) indicate the action to be taken such as changing or storing the wiper position. The address bits (A1 and A0) specify which potentiometer the command affects and the 8data bits (D7 to D0) specify the wiper position.Linear-Taper Digital Potentiometers_______________________________________________________________________________________9Write-Wiper Register (Command 00)Data written to the write-wiper registers (C1, C0 = 00)controls the wiper positions. The 8 data bits (D7 to D0)indicate the position of the wiper. For example, if DIN =0000 0000, the wiper moves to the position closest to L_. If DIN = 1111 1111, the wiper moves closest to H_.This command writes data to the volatile RAM, leaving the NV registers unchanged. When the device powers up,the data stored in the NV registers transfers to the volatile wiper register, moving the wiper to the stored position.Write-NV Register (Command 01)This command (C1, C0 = 01) stores the position of the wipers to the NV registers for use at power-up.Alternatively, the “copy wiper register to NV register”command can be used to store the position of the wipers to the NV registers. Writing to the NV registers does not affect the position of the wipers.Copy Wiper Register to NV Register (Command 10)This command (C1, C0 = 10) stores the current position of the wiper to the NV register, for use at power-up.Figure 2. Timing DiagramM A X 5487/M A X 5488/M A X 5489Dual, 256-Tap, Nonvolatile, SPI-Interface,Linear-Taper Digital Potentiometers 10______________________________________________________________________________________This command may affect one potentiometer at a time,or both simultaneously, depending on the state of A1and A0. Alternatively, the “write NV register” command can be used to store the current position of the wiper to the NV register.Copy NV Register to Wiper Register (Command 11)This command (C1, C0 = 11) restores the wiper position to the previously stored position in the NV register. This command may affect one potentiometer at a time, or both simultaneously, depending on the state of A1 and A0.Nonvolatile MemoryThe internal EEPROM consists of a nonvolatile register that retains the last stored value prior to power-down.The nonvolatile register is programmed to midscale at the factory. The nonvolatile memory is guaranteed for 200,000 wiper write cycles and 50 years for wiper data retention.Power-UpUpon power-up, the MAX5487/MAX5488/MAX5489load the data stored in the nonvolatile wiper register into the volatile memory register, updating the wiper position with the data stored in the nonvolatile wiper register. This initialization period takes 5µs.StandbyThe MAX5487/MAX5488/MAX5489 feature a low-power standby mode. When the device is not being pro-grammed, it enters into standby mode and supply cur-rent drops to 0.5µA (typ).Applications InformationThe MAX5487/MAX5488/MAX5489 are ideal for circuits requiring digitally controlled adjustable resistance,such as LCDFigures 4 and 5 show an application where the MAX5487/MAX5488/MAX5489 provide an adjustable,positive LCD-bias voltage. The op amp provides buffer-ing and gain to the resistor-divider network made by the potentiometer (Figure 4) or by a fixed resistor and a variable resistor (Figure 5).Programmable FilterFigure 6 shows the MAX5487/MAX5488/MAX5489 in a 1st-order programmable-filter application. Adjust the gain of the filter with R 2, and set the cutoff frequency with R 3.Figure 3. Digital-Interface FormatMAX5487/MAX5488/MAX5489Dual, 256-Tap, Nonvolatile, SPI-Interface,Linear-Taper Digital Potentiometers______________________________________________________________________________________11Use the following equations to calculate the gain (A)and the -3dB cutoff frequency (f C ):Adjustable Voltage ReferenceFigure 7 shows the MAX5487/MAX5488/MAX5489 usedas the feedback resistors in multiple adjustable volt-age-reference applications. Independently adjust the output voltages of the MAX6160s from 1.23V to V IN -0.2V by changing the wiper positions of the MAX5487/MAX5488/MAX5489.Offset Voltage and Gain AdjustmentConnect the high and low terminals of one potentiome-ter of a MAX5487/MAX5488/MAX5489 to the NULL inputs of aMAX410, and connect the wiper to the op amp’s positive supply to nullify the offset voltage over the operating temperature range. Install the other potentiometer in the feedback path to adjust the gain of the MAX410 (see Figure 8).Chip InformationTRANSISTOR COUNT: 12,177PROCESS: BiCMOSFigure 4. Positive LCD-Bias Control Using a Voltage-DividerFigure 5. Positive LCD-Bias Control Using a Variable ResistorFigure 6. Programmable FilterPin Configurations (continued)M A X 5487/M A X 5488/M A X 5489Dual, 256-Tap, Nonvolatile, SPI-Interface,Linear-Taper Digital Potentiometers12______________________________________________________________________________________Figure 7. Adjustable Voltage ReferenceFigure 8. Offset Voltage and Gain AdjustmentOrdering Information/Selector Guide (continued)*EP = Exposed pad**Future product—contact factory for availabilty .Revision HistoryPages changed at Rev3: 1, 8, 12, 15MAX5487/MAX5488/MAX5489Dual, 256-Tap, Nonvolatile, SPI-Interface,Linear-Taper Digital Potentiometers______________________________________________________________________________________13Package Information(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information,go to /doc/010aa430376baf1ffc4fadca.html /packages .)M A X 5487/M A X 5488/M A X 5489Dual, 256-Tap, Nonvolatile, SPI-Interface,Linear-Taper Digital PotentiometersPackage Information(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information,go to /doc/010aa430376baf1ffc4fadca.html /packages .)Dual, 256-Tap, Nonvolatile, SPI-Interface,Linear-Taper Digital PotentiometersMaxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________15 2007 Maxim Integrated Productsis a registered trademark of Maxim Integrated Products, Inc. Package Information (continued)(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information,go to /doc/010aa430376baf1ffc4fadca.html /packages.)MAX5487/MAX5488/MAX5489。

MAX5037ETH-T中文资料

ering Information
PART MAX5037EMH MAX5037ETH TEMP RANGE -40°C to +85°C -40°C to +85°C PIN-PACKAGE 44 MQFP 44 Thin QFN
Pin Configuration appears at end of data sheet.
元器件交易网
VRM 9.0, Dual-Phase, Parallelable, Average Current-Mode Controller MAX5037
ABSOLUTE MAXIMUM RATINGS
IN to SGND.............................................................-0.3V to +30V BST_ to SGND…………………………………….… .-0.3V to +35V DH_ to LX_ .................................-0.3V to [(VBST_ - VLX_) + 0.3V] DL_ to PGND ..............................................-0.3V to (VDD + 0.3V) BST_ to LX_ ..............................................................-0.3V to +6V VCC to SGND............................................................-0.3V to +6V VDD to PGND............................................................-0.3V to +6V SGND to PGND .....................................................-0.3V to +0.3V All Other Pins to SGND...............................-0.3V to (VCC + 0.3V) Continuous Power Dissipation (TA = +70°C) 44-Pin MQFP (derate 12.7mW/°C above +70°C)........1013mW 44-Pin QFN (derate 27.0mW/°C above +70°C) .......2162.2mW Package Thermal Resistance, θJC (QFN only) ..................2°C/W Operating Temperature Range ...........................-40°C to +85°C Maximum Junction Temperature .....................................+150°C Storage Temperature Range .............................-60°C to +150°C Lead Temperature (soldering, 10s) .................................+300°C

MAX5957AETN+T中文资料

General DescriptionThe MAX5957/MAX5958 triple hot-plug controllers are designed for PCI Express (PCIe)®applications. These devices provide hot-plug control for 12V, 3.3V, and 3.3V auxiliary supplies of three PCIe slots. The MAX5957/MAX5958s’ logic inputs/outputs allow interfacing directly with the system hot-plug management controller or through an SMBus™ with an external I/O expander such as the MAX7313. An integrated debounced attention switch and present-detect signals simplify system design.The MAX5957/MAX5958 drive six external n-channel MOSFETs to control the 12V and 3.3V main outputs. The 3.3V auxiliary outputs are controlled through 0.2Ωn-chan-nel MOSF ETs. Internal charge pumps provide the gate drive for the 12V outputs while the gate drive of the 3.3V output is driven by the 12V input supply clamped to 5.5V above the respective 3.3V main supply rail. The 3.3V aux-iliary outputs are completely independent from the main outputs with their own charge pumps.At power-up, the MAX5957/MAX5958 keep all the MOSFETs (internal and external) off until the supplies rise above their respective undervoltage lockout (UVLO)thresholds. Upon a turn-on command, the MAX5957/MAX5958 enhance the external and internal MOSF ETs slowly with a constant gate current to limit the power-sup-ply inrush current.The MAX5957/MAX5958 actively limit the current to pro-tect all outputs at all times and shut down if an overcur-rent condition occurs. After an overcurrent fault condition,the MAX5957L/MAX5958L latch off while the MAX5957A/MAX5958A automatically restart after a restart time delay.The MAX5957/MAX5958 are offered in latch-off or auto-restart versions (see the Selector Guide ).The MAX5957/MAX5958 are available in a 56-pin TQFN package and operate over the -40°C to +85°C temper-ature range.ApplicationsServersDesktop Mobile Server Platforms WorkstationsEmbedded DevicesFeatureso PCIe Complianto Hot Swap 12V, 3.3V, and 3.3V Auxiliary for 3 PCIe Slots o Integrated Power MOSFETs for Auxiliary Supply Rails o Controls di/dt and dV/dto Active Current Limiting Protects Against Overcurrent/Short-Circuit Conditions o Programmable Current-Limit Timeout o PWRGD Signal Outputs with Programmable Power-On Reset (POR) (160ms Default)o Latched FAULT Signal Output After Overcurrent or Overtemperature Fault o Attention Switch Inputs/Outputs with 4ms Debounce o Present-Detect Inputso Force-On Inputs Facilitate Testing/Debug o Thermal Shutdowno Allow Control Through SMBus with an I/O ExpanderMAX5957/MAX5958Triple PCI Express, Hot-Plug ControllersOrdering Information19-0884; Rev 0; 7/07For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,or visit Maxim’s website at .Pin Configuration and Typical Application Circuit appear at end of data sheet.PCI Express is a registered trademark of PCI-SIG Corp. SMBus is a trademark of Intel Corp.M A X 5957/M A X 5958Triple PCI Express, Hot-Plug Controllers 2_______________________________________________________________________________________ABSOLUTE MAXIMUM RATINGSELECTRICAL CHARACTERISTICS(V 12VIN = V 12S_+= V 12S_-= 12V, V 3.3S_+=V 3.3S_-= V 3.3AUXIN = V ON_= V AUXON_= V FON_= 3.3V, PWRGD_= FAULT_= PORADJ =TIM = OUTPUT_ = 12G_ = 3.3G_ = OPEN, INPUT_ = PRES-DET_= PGND = GND, T A = T J = -40°C to +85°C, unless otherwise noted. Typical values are at T A = T J = +25°C.) (Note 1)Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.(All voltages referenced to GND, unless otherwise noted.)12VIN......................................................................-0.3V to +14V 12G_..........................................................-0.3V to (V 12VIN + 6V)12S_+, 12S_-, 3.3G_..............................-0.3V to (V 12VIN + 0.3V)3.3VAUXIN, ON_, FAULT_, PWRGD_.......................-0.3V to +6V PGND ....................................................................-0.3V to +0.3V All Other Pins ..................................-0.3V to (V 3.3VAUXIN + 0.3V)Continuous Power Dissipation (T A = +70°C)56-Pin Thin QFN (derate 40mW/°C above +70°C).....3200mW Operating Temperature Range ...........................-40°C to +85°C Junction Temperature......................................................+150°C Storage Temperature Range.............................-65°C to +150°C Lead Temperature (soldering, 10s).................................+300°CMAX5957/MAX5958Triple PCI Express, Hot-Plug Controllers_______________________________________________________________________________________3ELECTRICAL CHARACTERISTICS (continued)(V 12VIN = V 12S_+= V 12S_-= 12V, V 3.3S_+=V 3.3S_-= V 3.3AUXIN = V ON_= V AUXON_= V FON_= 3.3V, PWRGD_= FAULT_= PORADJ =TIM = OUTPUT_ = 12G_ = 3.3G_ = OPEN, INPUT_ = PRES-DET_= PGND = GND, T A = T J = -40°C to +85°C, unless otherwiseM A X 5957/M A X 5958Triple PCI Express, Hot-Plug Controllers 4_______________________________________________________________________________________ELECTRICAL CHARACTERISTICS (continued)(V 12VIN = V 12S_+= V 12S_-= 12V, V 3.3S_+=V 3.3S_-= V 3.3AUXIN = V ON_= V AUXON_= V FON_= 3.3V, PWRGD_= FAULT_= PORADJ =TIM = OUTPUT_ = 12G_ = 3.3G_ = OPEN, INPUT_ = PRES-DET_= PGND = GND, T A = T J = -40°C to +85°C, unless otherwiseNote 2:PWRGD_asserts a time t POR_HL after V PGTH12,V PGTH3.3,and V PGTH3.3AUX conditions are met.Note 3:The UVLO for the 3.3V supply is sensed at 3.3S_+.Note 4:This is the time that ON_ or AUXON_ must stay low when resetting a fault condition.MAX5957/MAX5958Triple PCI Express, Hot-Plug Controllers_______________________________________________________________________________________512V INPUT SUPPLY CURRENTvs. TEMPERATUREM A X 5957 t o c 01TEMPERATURE (°C)S U P P L Y C U R R E N T (m A )603510-150.920.940.960.981.001.021.041.061.081.100.90-4085 3.3VAUXIN SUPPLY CURRENTvs. TEMPERATUREM A X 5957 t o c 02TEMPERATURE (°C)3.3V A U X I N S U P P L Y C U R R E N T (m A )603510-150.51.01.52.02.53.03.54.04.55.00-4085ON_ AND AUXON_ LOW-TO-HIGH THRESHOLDVOLTAGE vs. TEMPERATURETEMPERATURE (°C)T H R E S H O L D V O L T A G E (V )603510-151.251.301.351.401.451.501.551.601.20-40853.3VAUXO_ OUTPUT VOLTAGEvs. OUTPUT CURRENTOUTPUT CURRENT (A)O U T P U T V O L T A G E (V )0.80.60.40.20.90.70.50.30.10.51.01.52.02.53.03.54.0001.012G_ AND 3.3G_ GATE CHARGE CURRENT vs. TEMPERATURETEMPERATURE (°C)G A T E C H A R G E C U R R E N T (µA )603510-154.804.854.904.955.005.055.105.155.204.75-408512G_ AND 3.3G_ GATE DISCHARGE CURRENT vs. TEMPERATURETEMPERATURE (°C)G A T E D I S C H A R G E C U R R E N T (µA )603510-15160165170175180150155-40853.3VAUX INTERNAL SWITCHMAXIMUM DROPOUT vs. TEMPERATURETEMPERATURE (°C)D R O P O U T V O L T A G E (V )603510-150.020.040.060.080.100.120.140.160.180.200-408512V AND 3.3V CURRENT-LIMIT THRESHOLDVOLTAGE vs. TEMPERATURETEMPERATURE (°C)12V A N D 3.3V C U R R E N T -L I M I T T H R E S H O L D (m V )603510-151020304050600-4085AUXILIARY CURRENT LIMITvs. TEMPERATURETEMPERATURE (°C)A U X I L I A R Y C U R R E N T (m A )603510-150.100.300.200.400.500.600.700.800.901.00-4085Typical Operating Characteristics(V 12VIN = V 12S_+= 12V, V 3.3S_+= V 3.3S_-= V 3.3AUXIN = V ON_= V AUXON_= V FON_= 3.3V, PWRGD_= FAULT_= PORADJ = TIM =OUTPUT_ = OPEN, INPUT_ = PRES-DET_= PGND = GND. See the Typical Application Circuit .)M A X 5957/M A X 5958Triple PCI Express, Hot-Plug Controllers 6_______________________________________________________________________________________Typical Operating Characteristics (continued)(V 12VIN = V 12S_+= 12V, V 3.3S_+= V 3.3S_-= V 3.3AUXIN = V ON_= V AUXON_= V FON_= 3.3V, PWRGD_= FAULT_= PORADJ = TIM =OUTPUT_ = OPEN, INPUT_ = PRES-DET_= PGND = GND. See the Typical Application Circuit .)12V UNDERVOLTAGE LOCKOUT THRESHOLD vs. TEMPERATUREM A X 5957 t o c 10TEMPERATURE (°C)U V L O T H R E S H O L D (V )6035-15109.859.909.9510.0010.0510.1010.1510.209.80-4085 3.3VAUXON UNDERVOLTAGE LOCKOUT THRESHOLD vs. TEMPERATUREM A X 5957 t o c 11TEMPERATURE (°C)U V L O T H R E S H O L D (V )603510-152.542.582.622.662.702.522.562.602.642.682.50-408512V TURN-ON/TURN-OFF TIMEMAX5957 toc1240ms/div12V OUTPUT VOLTAGE 12G_ON_PWRGD_10V/div20V/div5V/div 5V/div 3.3V TURN-ON/TURN-OFF TIMEMAX5957 toc1340ms/div3.3V OUTPUT 5V/div 3.3G_10V/div ON_5V/div 5V/div3.3V AUXILIARY TURN-ON/TURN-OFF TIMEMAX5957 toc1440ms/div3.3AUXO_OUTPUT VOLTAGE 2V/divAUXON_2V/divPWRGD_2V/divTURN-ON DELAY 3.3V OUTPUT AND3.3V AUXILIARY OUTPUTMAX5957 toc154ms/div5V/div 5V/div 5V/div 5V/div 10V/div3.3VAUXO_OUTPUT VOLTAGE 3.3 OUTPUT VOLTAGE 3.3 INPUT,3.3VAUXIN3.3G_PWRGD FAULT CONDITION ON 12V MAIN OUTPUT(AUTORESTART OPTION)12G_20V/div0A0V0V0V5V/div12V OUTPUT CURRENT 5A/div 100ms/div12V OUTPUT VOLTAGE 10V/divt RESTARTR LOAD STEP TO 1.5ΩMAX5957/MAX5958Triple PCI Express, Hot-Plug Controllers(V 12VIN = V 12S_+= 12V, V 3.3S_+= V 3.3S_-= V 3.3AUXIN = V ON_= V AUXON_= V FON_= 3.3V, PWRGD_= FAULT_= PORADJ = TIM =OUTPUT_ = OPEN, INPUT_ = PRES-DET_= PGND = GND. See the Typical Application Circuit .)_______________________________________________________________________________________7FAULT CONDITION ON 3.3V MAIN OUTPUT(AUTORESTART OPTION)3.3G_10V/divFAULT_5V/div3.3V MAIN OUTPUT CURRENT 2A/div100ms/div3.3V OUTPUT VOLTAGE 5V/divt RESTARTR LOAD STEP TO 0.5Ω0A 0V0V0VFAULT CONDITION ON AUXILIARY OUTPUT(AUTORESTART OPTION)FAULT_2V/div 3.3VAUXO_ OUTPUT CURRENT 500mA/div100ms/div3.3VAUXO_ OUTPUT VOLTAGE 2V/div0A0V 0VFAULT CONDITION ON 12V OUTPUT(LATCH OPTION MAX5958)MAX5957 toc1912G_20V/divFAULT_5V/div12V OUTPUT CURRENT 5A/div100ms/div12V OUTPUT VOLTAGE 10V/divFAULT CONDITION ON 12V OUTPUT12G_20V/divFAULT_5V/div12V OUTPUT CURRENT 5A/div 4ms/div12V OUTPUT VOLTAGE 10V/divR LOAD STEP TO 1.5Ωt FAULTFAULT CONDITION ON 3.3V OUTPUT(LATCHOFF OPTION)3.3G_10V/divFAULT_5V/div3.3V OUTPUT CURRENT 2A/div40ms/div3.3V OUTPUT VOLTAGE 5V/divFAULT CONDITION ON 3.3V MAIN OUTPUT3.3G_10V/div5V/div3.3V OUTPUT CURRENT 2A/div4ms/div3.3V OUTPUT VOLTAGE 5V/divM A X 5957/M A X 5958Triple PCI Express, Hot-Plug Controllers 8_______________________________________________________________________________________Typical Operating Characteristics (continued)(V 12VIN = V 12S_+= 12V, V 3.3S_+= V 3.3S_-= V 3.3AUXIN = V ON_= V AUXON_= V FON_= 3.3V, PWRGD_= FAULT_= PORADJ = TIM =OUTPUT_ = OPEN, INPUT_ = PRES-DET_= PGND = GND. See the Typical Application Circuit .)SHORT CIRCUIT ON 12V MAIN OUTPUTMAX5957 toc2512G_20V/divFAULT_5V/div12V OUTPUT CURRENT 5A/div2ms/div12V OUTPUT VOLTAGE 10V/div SHORT CIRCUIT ON 12V MAIN OUTPUTMAX5957 toc2612G_20V/divFAULT_5V/div12V OUTPUT CURRENT 10A/div4µs/div12V OUTPUT VOLTAGE 10V/div 0V0V 0VFAULT CONDITION ON AUXILIARY OUTPUT(LATCHOFF OPTION)FAULT_2V/div3.3VAUXO_ OUTPUT CURRENT 500mA/div100ms/div3.3VAUXO_ OUTPUT VOLTAGE 2V/divR LOAD STEP TO 3.5ΩMAX5958FAULT CONDITION ON AUXILIARY OUTPUTMAX5957 toc24FAULT_2V/div3.3VAUXO_ OUTPUT CURRENT 500mA/div10ms/div3.3VAUXO_ OUTPUT VOLTAGE 2V/divR LOAD STEP TO 3Ωt FAULTMAX5958SHORT CIRCUIT ON 3.3V MAIN OUTPUTMAX5957 toc273.3G_5V/divFAULT_5V/div3.3V OUTPUT CURRENT 2A/div2ms/div3.3V OUTPUT VOLTAGE 5V/div SHORT CIRCUIT ON 3.3V MAIN OUTPUTMAX5957 toc283.3G_5V/div5V/div 3.3V OUTPUT CURRENT 10A/div2µs/div3.3V OUTPUT VOLTAGE 5V/div 0VMAX5957/MAX5958Triple PCI Express, Hot-Plug Controllers_______________________________________________________________________________________9Typical Operating Characteristics (continued)(V 12VIN = V 12S_+= 12V, V 3.3S_+= V 3.3S_-= V 3.3AUXIN = V ON_= V AUXON_= V FON_= 3.3V, PWRGD_= FAULT_= PORADJ = TIM =OUTPUT_ = OPEN, INPUT_ = PRES-DET_= PGND = GND. See the Typical Application Circuit .)SHORT CIRCUIT ON3.3AUXO_ AUXILIARY OUTPUTFAULT_5V/div3.3VAUXO_ OUTPUT CURRENT 500mA/div2ms/div3.3VAUXO_ OUTPUT VOLTAGE 2V/divMAX5958SHORT CIRCUIT ON 3.3VAUXO_AUXILIARY OUTPUTFAULT_5V/div3.3VAUXO_ OUTPUT CURRENT 5A/div 0A0A 4µs/div3.3VAUXO_ OUTPUT VOLTAGE 2V/div MAX5958POWER-UP INTO FAULT (AUXILIARY SUPPLY)3.3VAUXO_ OUTPUT VOLTAGE 2V/divFAULT_5V/div3.3VAUXO_ OUTPUT CURRENT 500mA/div4ms/divAUXON_5V/div t SUR LOAD = 3ΩMAX5958POWER-UP INTO FAULT (3.3V MAIN)MAX5957 toc324ms/div3.3V OUTPUT CURRENT FAULT_3.3G_3.3V OUTPUT VOLTAGE ON_, AUXON_5A/div5V/div5V/div 2V/div5V/div POWER-UP INTO FAULT (12V MAIN OUTPUT)MAX5957 toc3312V OUTPUT VOLTAGE 10V/div FAULT_5V/div12V OUTPUT CURRENT 5A/div 4ms/div ON_, AUXON_5V/div t SU12G_10V/divPRESENT-DETECT (ON/OFF) OPERATIONMAX5957 toc3440ms/div12V OUTPUT VOLTAGEPWRGD_3.3VAUXO_OUTPUT VOLTAGE PRES-DET_10V/div5V/div 5V/div5V/divM A X 5957/M A X 5958Triple PCI Express, Hot-Plug Controllers 10______________________________________________________________________________________Typical Operating Characteristics (continued)(V 12VIN = V 12S_+= 12V, V 3.3S_+= V 3.3S_-= V 3.3AUXIN = V ON_= V AUXON_= V FON_= 3.3V, PWRGD_= FAULT_= PORADJ = TIM =OUTPUT_ = OPEN, INPUT_ = PRES-DET_= PGND = GND. See the Typical Application Circuit .)PRESENT-DETECT (ON/OFF) OPERATIONMAX5957 toc354ms/div 12V OUTPUT VOLTAGEPWRGD_ 3.3V OUTPUT VOLTAGE PRES-DET_10V/div5V/div 5V/div5V/divFORCED-ON (ON/OFF) OPERATIONMAX5957 toc3640ms/div12V OUTPUT VOLTAGEPWRGD_3.3V AUXO_OUTPUT VOLTAGE FON_10V/div5V/div 5V/div5V/divFORCED-ON (ON/OFF) OPERATIONMAX5957 toc374ms/div 12V OUTPUT VOLTAGEPWRGD_3.3V OUTPUT VOLTAGE FON_10V/div5V/div 5V/div5V/divDEBOUNCED INPUT/OUTPUT OPERATIONMAX5957 toc38INPUT_2V/div10ms/divOUTPUT_2V/divPOWER-ON-RESET TIME vs. PORADJ RESISTORM A X 5957 t o c 39R PORADJ (k Ω)t P O R _H L (m s )90080060070020030040050010020040060080010001200140016001800200022002400001000t FAULT TIME DELAY vs. TIM RESISTORM A X 5957 t o c 40R TIM (k Ω)t F A U L T (m s )8006002004002040608010012014016018020001000MAX5957/MAX5958Triple PCI Express, Hot-Plug ControllersM A X 5957/M A X 5958Triple PCI Express, Hot-Plug ControllersMAX5957/MAX5958Triple PCI Express, Hot-Plug ControllersDetailed DescriptionThe MAX5957/MAX5958 triple hot-plug controllers are designed for PCIe applications. The devices provide hot-plug control for 12V, 3.3V, and 3.3V auxiliary sup-plies for three PCIe slots. The MAX5957/MAX5958s’logic inputs/outputs allow interfacing directly with the system hot-plug-management controller or through an SMBus with an external I/O expander. An integrated debounced attention switch and present-detect signals are included to simplify system design (Figure 1).MOSF ETs to control the 12V and 3.3V main outputs.The 3.3V auxiliary outputs are controlled through inter-nal 0.2Ωn-channel MOSF ETs. Internal charge pumps provide a gate drive for the 12V outputs while the gate drive of the 3.3V output is driven by the 12V input sup-ply. The 3.3V auxiliary outputs are completely indepen-dent from the main outputs with their own charge pumps.M A X 5957/M A X 5958Triple PCI Express, Hot-Plug ControllersMAX5957/MAX5958Triple PCI Express, Hot-Plug ControllersAt power-up, the MAX5957/MAX5958 keep all the external MOSFETs off until all supplies rise above their respective UVLO thresholds. These devices keep the internal MOSF ETs off only until the 3.3VAUXIN supply rises above its UVLO threshold. Upon a turn-on com-mand, the MAX5957/MAX5958 enhance the external and internal MOSFETs slowly with a constant gate cur-rent to limit the power-supply inrush current. The MAX5957/MAX5958 actively limit the current of all out-puts at all times and shut down the corresponding channel if an overcurrent condition persists for longer than a resistor-programmable overcurrent timeout (see the Fault Management section). Thermal protection cir-cuitry also shuts down all outputs if the die temperature exceeds +150°C. After an overcurrent or overtempera-ture fault condition, the MAX5957/MAX5958 latch off or automatically restart after a restart time delay.The power requirement for PCIe connectors is defined by the PCIe card specification and summarized in Table 1.StartupThe main supply outputs can become active only after all the following events have occurred:•V 3.3AUXIN is above its UVLO threshold.•V 12VIN and V 3.3SA+are both above their UVLO threshold.•ON_ is driven high.•PRES-DET_is low for more than 4ms.The auxiliary supply output is made available only after the following events have occurred:•V 3.3AUXIN is above its UVLO threshold.•AUXON_ is driven high.•PRES-DET_is low for more than 4ms.The FON_input overrides all other control signals and turns on the respective slot when driven low, as long as the UVLO thresholds have been reached. Table 2 sum-marizes the logic conditions required for startup. The aux-iliary supply input powers the internal control logic and analog references of the MAX5957/MAX5958, so the main supplies cannot be enabled, if V 3.3VAUXIN is not present.When an output is enabled, a programmable startup timer (t SU ) begins to count the startup time duration.The value of t SU is set to 2x the fault timeout period (t FAULT ). R TIM externally connected from TIM to GND sets the duration of t FAULT .M A X 5957/M A X 5958Triple PCI Express, Hot-Plug Controllers Table 2. Control Logic Truth TableFigure 2. Power-Up Timing, No FaultFigure 3. 12V Power-Up Timing (Turn-On into Output Overcurrent/Short Circuit)MAX5957/MAX5958Triple PCI Express, Hot-Plug Controllers12V and 3.3V Outputs Normal OperationThe MAX5957/MAX5958 monitor and actively limit the current of the 12V and 3.3V outputs after the startup period. Each output has its own overcurrent threshold.If any of the monitored output currents rise above the overcurrent threshold for a period t FAULT , FAULT_asserts and the controller disengages both the 12V and 3.3V outputs for the particular slot (see the Fault Management section).3.3V Auxiliary Output Normal OperationThe auxiliary output current is internally monitored and actively limited to the maximum current-limit value. An overcurrent fault condition occurs when the output cur-rent exceeds the overcurrent threshold for longer than t FAULT . A fault on an auxiliary channel causes all sup-plies of the affected channel to be disabled after a pro-grammable time period t FAULT .A fault condition on a main channel (V 12VIN or V 3.3VIN )causes all the channel’s main outputs to shut down after the t FAULT period and then either latch off or auto-matically restart after the t RESTART (t RESTART = 64 x t FAUALT ) period, depending on the device version. Afault on any of the channel’s main outputs does not affect the auxiliary channel (V 3.3AUXIN ).Power-Good (PWRGD_)Power-good (PWRGD_) is an open-drain output that pulls low a time (t POR_HL ) after all the outputs of the respective slot are fully on. All outputs are considered fully on when 3.3G_ has risen to V PGTH3.3, 12G_ has risen to V PGTH12, and V 3.3AUXO_is less than V PGTH3.3AUX . t POR_HL is adjustable from 2.4ms to 1.5s by connecting a resistor from PORADJ to GND. See the Setting the Power-On Reset and Timeout Period (t POR_HL )sections. Connect PORADJ to GND to com-pletely skip the POR time delay for PWRGD_assertion.Thermal ShutdownWhen the die temperature goes above (T SD ) +150°C, an overtemperature fault occurs and the MAX5957/MAX5958 shut down all outputs. The devices wait for the junction temperature to decrease below T SD - hysteresis before entering fault management (see the Fault Management section).Fault ManagementA fault occurs when an overcurrent or 12G_ or 3.3G_below the power-good threshold lasts longer than t FAULT or when the device experiences an overtemper-ature condition:• A fault on a main output (12V or 3.3V) shuts down both main outputs of the respective slot. The 3.3V auxiliary is not affected.• A fault on the 3.3V auxiliary output shuts down all three outputs of the respective slot.The MAX5957A/MAX5958A automatically restart from a fault shutdown after the t RESTART period while the MAX5957L/MAX5958L latch off. If an overcurrent fault occurred on a main output, bring ON_ low for at least t RESET (100µs) and high again to reset the fault and restart the outputs. If the overcurrent fault occurred on an auxiliary output or an overtemperature fault occurred, bring both ON_ and AUXON_ low for a mini-mum of t RESET to reset the fault. Toggle ON_ or only AUXON_ to reset the fault condition. If ON_ and AUXON are toggled before t RESTART time counting has elapsed, the MAX5957L/MAX5958L store the informa-tion and restart when the delay is finished. The MAX5957A/MAX5958A (autoretry versions) restart all channels automatically after t RESTART .Figure 4. 12 Output Overcurrent/Short Circuit During Normal OperationM A X 5957/M A X 5958Triple PCI Express, Hot-Plug Controllers Debounced Logic Gate (INPUT_ and OUTPUT_)INPUT1, INPUT2, and INPUT3 accept inputs from mechanical switches. The corresponding outputs are OUTPUT1, OUTPUT2, and OUTPUT3. OUTPUT_ is debounced for 4ms. When INPUT_ goes from high to low, OUTPUT_ goes low immediately and stays low for at least 4ms. After the debounce time, OUTPUT_ fol-lows INPUT_. If INPUT_ goes from low to high, OUT-PUT_ goes high immediately and stays high for at least 4ms. After the debounce time, OUTPUT_ follows INPUT_. Figure 5 shows the timing diagram describing the INPUT_/OUTPUT_ debounced feature.Present-Detect and Forced-On Inputs(PRES-DET_, FON_)PRES-DET_input detects the PRSNT#2 pin on a PCIe connector. When the card is plugged in, PRES-DET_goes low and allows the turn-on of the outputs of the respective slot after a 4ms debounced time. When the card is removed, an internal 50k Ωpullup resistor forces PRES-DET_high and the respective slot is shut down with no delay. PRES-DET_works in conjunction with ON_ and AUXON_ and only enables the device when ON_ and AUXON_ are high.A logic-low on FON_forces the respective slot (main supplies and auxiliary) to turn on regardless of the sta-tus of the other logic inputs, provided the UVLO thresh-olds are exceeded on all the inputs.Active Current LimitsActive current limits are provided for all three outputs of the three slots (slot A, slot B, and slot C). Connect a current-sense resistor between 12S_+ and 12S_- to set the current limit for the 12V outputs. The current limit is set to 54mV / R SENSE12. Connect a current-sense resis-tor between 3.3S_+ and 3.3S_- to set the current limit for the 3.3V main outputs to 20mV / R SENSE3.3. For the auxiliary output (3.3VAUXO_) the current limit is fixed at 450mA in the MAX5957 and 700mA in the case of the MAX5958.When the voltage across R SENSE12 or R SENSE3.3reaches the current-limit threshold voltage, the MAX5957/MAX5958 regulate the gate voltage to main-tain the current-limit threshold voltage across the sense resistor. If the current limit lasts for t FAULT , then an overcurrent fault occurs. The MAX5957/MAX5958 shut down both the 12V and 3.3V outputs and assert the FAULT_output of the respective slot.When the auxiliary output reaches the current limit for longer than t FAULT , a fault occurs and the device shuts down all outputs and asserts FAULT of the respective slot.UVLO ThresholdThe UVLO thresholds prevent the internal auxiliary MOSF ETs and the external main channel MOSF ETs from turning on if V 12VIN , V 3.3VIN , and V 3.3VAUXIN are not present. Internal comparators monitor the main supplies and the auxiliary supply and keep the gate-drive outputs (12GA, 12GB, 12GC, 3.3GA, 3.3GB, and 3.3GC) low until the supplies rise above their UVLO threshold. The 12V main supply is monitored at 12VIN and has a UVLO threshold of 10V. The 3.3V main sup-ply is monitored at 3.3SA+ and has a UVLO threshold of 2.65V. The auxiliary supply is monitored at 3.3AUXIN and has a 2.65V UVLO threshold. For either main channels to operate, V3.3AUXIN must be above its UVLO threshold.Figure 5. INPUT_ and OUTPUT_ Debounced FeatureMAX5957/MAX5958Triple PCI Express, Hot-Plug ControllersFigure 6. Fault Management FlowchartM A X 5957/M A X 5958Triple PCI Express, Hot-Plug Controllers External MOSFET Gate Drivers(12G_ and 3.3G_)The gate drive for the external MOSFETs is provided at 12GA, 12GB, 12GC, 3.3GA, 3.3GB, and 3.3GC. 12G_is the gate drive for the 12V main supply and is boost-ed to 5.3V above V 12VIN by its internal charge pump.During turn-on, 12G_ sources 5µA into the external gate capacitance to control the turn-on time of the external MOSF ET. During turn-off, 12G_ sinks 150µA from the external gate capacitance to quickly turn off the external MOSF ET. During short-circuit events, an internal 120mA current sink activates to rapidly bring the load current into the regulation limits.3.3G_ is the gate drive for the 3.3V main supply’s MOS-FET and is driven to 5.5V above the 3.3V main supply.The power for 3.3G_ is supplied from 12VIN and has no internal charge pump. During turn-on, 3.3G_ sources 5µA into the external gate capacitance to control the turn-on time of the external MOSF ET. During turn-off,3.3G_ sinks 150mA to quickly turn off the external MOSF ET. During short-circuit events, an internal 120mA current sink activates to rapidly turn off the appropriate external MOSFET.Auxiliary Supply (3.3VAUXIN)3.3VAUXIN provides power to the auxiliary outputs as well as the internal logic and references. The drains of the internal auxiliary MOSF ETs connect to 3.3AUXIN through internal sense resistors and the sources con-nect to the auxiliary outputs (3.3VAUXO_). Both MOSF ETs have typical on-resistance of 0.2Ω. Each channel’s internal charge pump boosts the gate-drive voltage to fully turn on the internal n-channel MOSFETs.The auxiliary supplies have an internal current limit set to 450mA (MAX5957), 700mA (MAX5958).Applications InformationSetting the Power-On Resett FAULT is the time an overcurrent or overtemperature fault must remain for the MAX5957/MAX5958 to disable the main or auxiliary channels of a particular slot.Program the fault timeout period (t FAULT ) by connect-ing a resistor (R TIM ) from TIM to GND. t FAULT can be calculated by the following equation:t FAULT = (166ns / Ω) x R TIMThe t FAULT programmed time duration must be chosen according to the total capacitance load connected to the 12G_ and 3.3G_ pins. To properly power up the main supply outputs, the following constraints need to be taken:t SU ≥(V GATE x C LOAD ) / I CHG where t SU = 2 x t FAULT and where:•I CHG = 5µA.•V GATE = 4.8V + V 12VIN for 12G_ and V GATE = 6.8V + V 3.3VIN for 3.3G_.•C LOAD is the total capacitance load at the gate.Maximum and minimum values for R TIM are 500Ωand 500k Ω, respectively. Leave TIM floating for a default t FAULT of 10ms.Timeout Period (t POR_HL )t POR_HL is the time from when the gate voltages of all outputs of a slot reach their power-good threshold to when PWRGD_pulls low. Program the POR timeout period (t POR ) by connecting a resistor (R PORADJ ) from PORADJ to GND. t POR_HL can be calculated by the fol-lowing equation:t POR_HL = (2.5µs / Ω) x R PORADJMaximum and minimum values for R PORADJ are 500Ωand 500k Ω, respectively. Leave PORADJ floating for a default t POR of 150ms. Connect PORADJ to GND in order to completely skip the power-on delay time prior to the PWRGD_assertion.Component SelectionSelect the external n-channel MOSFET according to the applications current requirement. Limit the switch power dissipation by choosing a MOSF ET with an R DS_ON low enough to have a minimum voltage drop at full load. High R DS_ON causes larger output ripple if there are pulsed loads. High R DS_ON can also trigger an external undervoltage fault at full load. Determine the MOSF ET’s power-rating requirement to accommo-date a short-circuit condition on the board during start-up. Table 3 lists the MOSF ETs and sense resistor manufacturers.。

MAX4617EUE中文资料

________________General DescriptionThe MAX4617/MAX4618/MAX4619 are high-speed, low-voltage, CMOS analog ICs configured as an 8-channel multiplexer (MAX4617), two 4-channel multiplexers (MAX4618), and three single-pole/double-throw (SPDT)switches (MAX4619).These CMOS devices can operate continuously with a +2V to +5.5V single supply. Each switch can handle Rail-to-Rail ®analog signals. The off-leakage current is only 1nA at T A = +25°C and 10nA at T A = +85°C.All digital inputs have 0.8V to 2.4V logic thresholds,ensuring TTL/CMOS-logic compatibility when using a single +5V supply.________________________ApplicationsBattery-Operated Equipment Audio/Video Signal RoutingLow-Voltage Data-Acquisition Systems Communications Circuits____________________________Featureso Fast Switching Times15ns t ON 10ns t OFFo Pin Compatible with Industry-Standard 74HC4051/74HC4052/74HC4053 and MAX4581/MAX4582/MAX4583o Guaranteed On-Resistance10Ωmax (+5V Supply)20Ωmax (+3V Supply)o Guaranteed 1Ω On-Resistance Match Between Channels (single +5V supply)o Guaranteed Low Off-Leakage Current:1nA at +25°Co Guaranteed Low On-Leakage Current:1nA at +25°Co +2V to +5.5V Single-Supply Operation o TTL/CMOS-Logic Compatible o Low Crosstalk: <-96dB o High Off-Isolation: <-93dBo Low Distortion: <0.017% (600Ω)MAX4617/MAX4618/MAX4619High-Speed, Low-Voltage, CMOS AnalogMultiplexers/Switches________________________________________________________________Maxim Integrated Products 1____________________________________Pin Configurations/Functional Diagrams19-1502; Rev 2; 3/02_______________Ordering InformationOrdering Information continued at end of data sheet.Rail-to-Rail is a registered trademark of Nippon Motorola, Ltd.For pricing, delivery, and ordering information,please contact Maxim/Dallas Direct!at 1-888-629-4642, or visit Maxim’s website at .16 Plastic DIP16 Narrow SO 16 TSSOP PIN-PACKAGE TEMP. RANGE 0°C to +70°C 0°C to +70°C 0°C to +70°CMAX4617CPEMAX4617CSE MAX4617CUE PARTM A X 4617/M A X 4618/M A X 4619High-Speed, Low-Voltage, CMOS Analog Multiplexers/Switches 2_______________________________________________________________________________________ABSOLUTE MAXIMUM RATINGSELECTRICAL CHARACTERISTICS —Single +5V Supply(V CC = +4.5V to +5.5V, V _H = 2.4V, V _L = 0.8V, T A = T MIN to T MAX , unless otherwise noted. Typical values are at T A = +25°C.) (Note 2)Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.Voltages Referenced to GNDV CC, A, B, C, or Enable...........................................-0.3V to +6V Voltage into Any Analog Terminal(Note 1).........................................................-0.3V to (V CC + 0.3V)Continuous Current into Any Terminal..............................±75mA Peak Current, X_, Y_, Z_(pulsed at 1ms, 10% duty cycle).................................±200mA Continuous Power Dissipation (T A = +70°C)TSSOP (derate 6.7mW/°C above +70°C)......................533mW16-Pin QFN (derate 18.5mW/°C above +70°C)...........1481mW Narrow SO (derate 8.70mW/°C above +70°C)..............696mW Plastic DIP (derate 10.53mW/°C above +70°C)..............842mW Operating Temperature RangesMAX461_C_ _ ......................................................0°C to +70°C MAX461_E_ _....................................................-40°C to +85°C Storage Temperature Range.............................-65°C to +150°C Lead Temperature (soldering, 10sec).............................+300°CNote 1:Voltages exceeding V CC or GND on any analog signal terminal are clamped by internal diodes. Limit forward-diode currentto maximum current rating.MAX4617/MAX4618/MAX4619High-Speed, Low-Voltage, CMOS AnalogMultiplexers/Switches_______________________________________________________________________________________3ELECTRICAL CHARACTERISTICS —Single +5V Supply (continued)(V CC = +4.5V to +5.5V, V _H = 2.4V, V _L = 0.8V, T A = T MIN to T MAX , unless otherwise noted. Typical values are at T A = +25°C.) (Note 2)M A X 4617/M A X 4618/M A X 4619High-Speed, Low-Voltage, CMOS Analog Multiplexers/Switches 4_______________________________________________________________________________________ELECTRICAL CHARACTERISTICS —Single +3.3V Supply(V CC = +3V to +3.6V, V _H = 2.0V, V _L = 0.5V, T A = T MIN to T MAX , unless otherwise noted. Typical values are at T A = +25°C.) (Note 2)MAX4617/MAX4618/MAX4619High-Speed, Low-Voltage, CMOS AnalogMultiplexers/Switches_______________________________________________________________________________________5Note 2:The algebraic convention is used in this data sheet; the most negative value is shown in the minimum column.Note 3:∆R ON = R ON(MAX)- R ON(MIN).Note 4:Flatness is defined as the difference between the maximum and minimum value of on-resistance as measured over the specifiedanalog signal ranges; i.e., V X_, V Y_, V Z_= 3V to 0 and 0 to -3V.Note 5:Leakage parameters are 100% tested at maximum-rated hot operating temperature, and guaranteed by correlation at T A = +25°C.Note 6:Guaranteed by design, not production tested.Note 7:∆R ON matching specifications for QFN-packaged parts are guaranteed by design.ELECTRICAL CHARACTERISTICS —Single +2.5V Supply(V CC = +2.5V, T A = T MIN to T MAX , unless otherwise noted. Typical values are at T A = +25°C.) (Note 2)M A X 4617/M A X 4618/M A X 4619High-Speed, Low-Voltage, CMOS Analog Multiplexers/Switches 6_______________________________________________________________________________________252015105002.53.0 3.54.0 4.50.5 1.0 1.5 2.05.0ON-RESISTANCE vs. V X , V Y , V ZV X , V Y , V Z (V)O N -R E S I S T A N C E (Ω)02.53.01.52.00.51.03.54.04.55.002.01.50.5 1.0 2.53.0 3.54.0 4.55.0ON-RESISTANCE vs.V X , V Y , V Z AND TEMPERATUREV X , V Y , V Z (V)R O N (Ω)10000.01-4010020406080-20OFF-LEAKAGE vs. TEMPERATURE1010.1100TEMPERATURE (°C)O F F -L E A K A G E (p A )0.1110100-40-2020406080100ON-LEAKAGE vs. TEMPERATUREM A X 4617 t o c 04TEMPERATURE (°C)O N -L E A K A G E (p A )042681416181210201.0 1.52.0 2.50.53.0 3.54.0 4.55.0CHARGE INJECTION vs. V X , V Y , V ZM A X 4617 t o c 05V X , V Y , V Z (V)C H A R G E I N J E C T I O N (p C )SUPPLY CURRENT vs. TEMPERATURE10,0001-40206040-201008010TEMPERATURE (°C)I C C (p A )10010000SUPPLY CURRENT vs.LOGIC VOLTAGE2.5V A , V B , V C , V ENABLE (V)I C C (m A )2.01.50.51.05.02.01.00.5 1.53.53.02.54.54.0Typical Operating Characteristics(V CC = +5V, GND = 0, T A = +25°C, unless otherwise noted.)MAX4617/MAX4618/MAX4619High-Speed, Low-Voltage, CMOS AnalogMultiplexers/Switches_______________________________________________________________________________________700.0050.0100.0150.0200.02508104621214161820TOTAL HARMONIC DISTORTIONvs. FREQUENCYFREQUENCY (kHz)T H D (%)42861210142.0 3.0 3.52.5 4.0 4.5 5.0 5.5SWITCHING TIME vs. VOLTAGEM A X 4617 t o c 11V+ (V)S W I T C H I N G T I M E S (n s )1.01.41.21.61.82.02.53.04.03.54.55.0INPUT HIGH LOGIC THRESHOLDvs. SUPPLY VOLTAGEM A X 4617 t o c 08V CC (V)V A , V B , V C , V E N A B L E (V)10k100k1M10M100M500MFREQUENCY RESPONSEFREQUENCY (Hz)G A I N (d B )P H A S E (°)-100-70-80-90-60-50-40-30-20-100-180-72-108-144-3603672108144180Typical Operating Characteristics (continued)(V CC = +5V, GND = 0, T A = +25°C, unless otherwise noted.)M A X 4617/M A X 4618/M A X 4619High-Speed, Low-Voltage, CMOS Analog Multiplexers/Switches 8_________________________________________________________________________________________________Applications InformationPower-Supply ConsiderationsOverviewThe MAX4617/MAX4618/MAX4619 construction is typi-cal of most CMOS analog switches. They have two sup-ply pins: V CC and GND. V CC and GND are used to drive the internal CMOS switches and set the limits of the ana-log voltage on any switch. Reverse ESD-protection diodes are internally connected between each analog-signal pin and both V CC and GND. If any analog signal exceeds V CC or GND, one of these diodes conducts.During normal operation, these and other reverse-biased ESD diodes leak, forming the only current drawn from V CC or GND.Virtually all the analog leakage current comes from the ESD diodes. Although the ESD diodes on a given signal pin are identical and therefore fairly well balanced, they are reverse biased differently. Each is biased by either V CC or GND and the analog signal. This means their leakages will vary as the signal varies. The difference in the two diode leakages to the V CC and GND pins con-stitutes the analog-signal-path leakage current. All ana-log leakage current flows between each pin and one of the supply terminals, not to the other switch terminal.This is why both sides of a given switch can show leak-age currents of either the same or opposite polarity.V CC and GND power the internal logic and set the input logic limits. Logic inputs have ESD-protection diodes to ground.Note:Input and output pins are identical and interchangeable. Any may be considered an input or output; signals pass equally wellin both directions.Pin DescriptionMAX4617/MAX4618/MAX4619High-Speed, Low-Voltage, CMOS AnalogMultiplexers/Switches_______________________________________________________________________________________9The logic-level thresholds are TTL/CMOS compatible when V CC is +5V. As V CC rises, the threshold increas-es; as V CC falls, the threshold decreases. For example,when V CC = +3V the guaranteed minimum logic-high threshold decreases to 2.0VPower SupplyThese devices operate from a single supply between +2.5V and +5.5V. All of the bipolar precautions must be observed. At room temperature, they actually “work”with a single supply near or below +2V, although as supply voltage decreases, switch on-resistance becomes very high.Overvoltage ProtectionProper power-supply sequencing is recommended for all CMOS devices. Do not exceed the absolute maxi-mum ratings because stresses beyond the listed rat-ings can cause permanent damage to the devices.Always sequence V CC on first, followed by the logic inputs and analog signals. If power-supply sequencing is not possible, add two small signal diodes (D1, D2) in series with the supply pins for overvoltage protection (Figure 1).Adding diodes reduces the analog-signal range to one diode drop below V CC and one diode drop above GND, but does not affect the devices’ low switch resis-tance and low leakage characteristics. Device opera-tion is unchanged, and the difference between V CC and GND should not exceed 6V. These protection diodes are not recommended if signal levels must extend to ground.High-Frequency PerformanceIn 50Ωsystems, signal response is reasonably flat up to 50MH z (see Typical Operating Characteristics ).Above 20MH z, the on-response has several minor peaks that are highly layout dependent. The problem is not turning the switch on, but turning it off. The off-state switch acts like a capacitor and passes higher frequen-cies with less attenuation. At 10MH z, off-isolation is about -50dB in 50Ωsystems, becoming worse (approx-imately 20dB per decade) as frequency increases.H igher circuit impedances also degrade off-isolation.Adjacent channel attenuation is about 3dB above that of a bare IC socket and is entirely due to capacitive coupling.Pin NomenclatureThe MAX4617/MAX4618/MAX4619 are pin compatible with the industry-standard 74H C4051/74H C4052/74H C4053 and the MAX4581/MAX4582/MAX4583. In single-supply applications, they function identically and have identical logic diagrams, although these parts dif-fer electrically.The pin designations and logic diagrams in this data sheet conform to the original 1972 specifications pub-lished by RCA for the CD4051/CD4052/CD4053. These designations differ from the standard Maxim switch and mux designations found on other Maxim data sheets (including the MAX4051/MAX4052/MAX4053) and may cause confusion. Designers who feel more comfortable with Maxim’s standard designations are advised that the pin designations and logic diagrams on the MAX4051/MAX4052/MAX4053 data sheet may be freely applied to the MAX4617/MAX4618/MAX4619.Figure 1. Overvoltage Protection Using External Blocking DiodesM A X 4617/M A X 4618/M A X 4619High-Speed, Low-Voltage, CMOS Analog Multiplexers/Switches 10______________________________________________________________________________________X = Don’t care*C not present on MAX4618.Note:Input and output pins are identical and interchangeable. Either may be considered an input or output; signals pass equallywell in either direction.MAX4617/MAX4618/MAX4619High-Speed, Low-Voltage, CMOS AnalogMultiplexers/Switches______________________________________________________________________________________11Figure 2. Address Transition Times______________________________________________Test Circuits/Timing DiagramsM A X 4617/M A X 4618/M A X 4619High-Speed, Low-Voltage, CMOS Analog Multiplexers/Switches 12______________________________________________________________________________________Figure 3. Enable Switching Times_________________________________Test Circuits/Timing Diagrams (continued)MAX4617/MAX4618/MAX4619High-Speed, Low-Voltage, CMOS AnalogMultiplexers/Switches______________________________________________________________________________________13Figure 4. Break-Before-Make IntervalFigure 5. Charge Injection_________________________________Test Circuits/Timing Diagrams (continued)M A X 4617/M A X 4618/M A X 4619High-Speed, Low-Voltage, CMOS Analog Multiplexers/Switches14______________________________________________________________________________________Figure 6. Off-Isolation, On-Loss, and CrosstalkFigure 7. Capacitance _________________________________Test Circuits/Timing Diagrams (continued)MAX4617/MAX4618/MAX4619High-Speed, Low-Voltage, CMOS AnalogMultiplexers/Switches______________________________________________________________________________________15___________________Chip InformationTRANSISTOR COUNT: 244M A X 4617/M A X 4618/M A X 4619High-Speed, Low-Voltage, CMOS Analog Multiplexers/Switches Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.16____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600©2002 Maxim Integrated ProductsPrinted USAis a registered trademark of Maxim Integrated Products.________________________________________________________Package Information(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information,。

MAX1737EEI中文资料

Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
Ordering Information
PART MAX1737EEI TEMP. RANGE -40°C to +85°C PIN-PACKAGE 28 QSOP
Applications
Notebook Computers Hand-Held Instruments Li+ Battery Packs Desktop Cradle Chargers
INPUT SUPPLY
Typical Operating Circuit
DCIN VL
CSSP CSSN DHI
Pin Configuration
TOP VIEW
VL 1 ISETIN 2 ISETOUT 3 THM 4 REF 5 GND 6 BATT 7 VADJ 8 CCV 9 CCS 10 CCI 11 CELL 12 TIMER1 13 TIMER2 14 28 DCIN 27 CSSP 26 CSSN 25 DHI 24 LX

MAX218EWP-T中文资料

_______________General DescriptionThe MAX218 RS-232 transceiver is intended for battery-powered EIA/TIA-232E and V.28/V.24 communications interfaces that need two drivers and two receivers with minimum power consumption. It provides a wide +1.8V to +4.25V operating voltage range while maintaining true RS-232 and EIA/TIA-562 voltage levels. The MAX218 runs from two alkaline, NiCd, or NiMH cells without any form of voltage regulator.A shutdown mode reduces current consumption to 1µA, extending battery life in portable systems. While shut down, all receivers can remain active or can be disabled under logic control, permitting a system incor-porating the CMOS MAX218 to monitor external devices while in low-power shutdown mode.A guaranteed 120kbps data rate provides compatibility with popular software for communicating with personal computers. Three-state drivers are provided on all receiver outputs so that multiple receivers, generally of different interface standards, can be wire-ORed at the UART. The MAX218 is available in 20-pin DIP, SO, and SSOP packages.________________________ApplicationsBattery-Powered Equipment Computers Printers Peripherals Instruments Modems____________________________FeaturesBETTER THAN BIPOLAR!o Operates Directly from Two Alkaline, NiCd, or NiMH Cells o +1.8V to +4.25V Supply Voltage Range o 120kbps Data Rateo Low-Cost Surface-Mount Components o Meets EIA/TIA-232E Specifications o 1µA Low-Power Shutdown Modeo Both Receivers Active During Low-Power Shutdown o Three-State Receiver Outputs o Flow-Through Pinout o On-Board DC-DC Converterso 20-Pin SSOP, Wide SO, or DIP Packages______________Ordering Information*Contact factory for dice specifications.MAX2181.8V to 4.25V-Powered,True RS-232 Dual Transceiver________________________________________________________________Maxim Integrated Products1__________________Pin Configuration__________Typical Operating CircuitCall toll free 1-800-998-8800 for free samples or literature.19-0246; Rev 1; 7/95M A X 2181.8V to 4.25V-Powered,True RS-232 Dual Transceiver 2_______________________________________________________________________________________ABSOLUTE MAXIMUM RATINGSELECTRICAL CHARACTERISTICS(Circuit of Figure 1, V CC = 1.8V to 4.25V, C1 = 0.47µF, C2 = C3 = C4 = 1µF, L1 = 15µH, T A = T MIN to T MAX , unless otherwise noted.Typical values are at V= 3.0V, T = +25°C.)Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.Supply VoltagesV CC ....................................................................-0.3V to +4.6V V+..........................................................(V CC - 0.3V) to +7.5V V-.......................................................................+0.3V to -7.4V V CC to V-..........................................................................+12V LX ................................................................-0.3V to (1V + V+)Input VoltagesT_IN, EN, S —H —D —N –.................................................-0.3V to +7V R_IN.................................................................................±25V Output VoltagesT_OUT.............................................................................±15V)R_OUT....................................................-0.3V to (V CC + 0.3V)Short-Circuit Duration, R_OUT, T_OUT to GND .......Continuous Continuous Power Dissipation (T A = +70°C)Plastic DIP (derate 11.11mW/°C above +70°C)..........889mW Wide SO (derate 10.00mW/°C above +70°C)..............800mW SSOP (derate 8.00mW/°C above +70°C)...................640mW Operating Temperature RangesMAX218C_ P.....................................................0°C to +70°C MAX218E_ P...................................................-40°C to +85°C Storage Temperature Range ...........................-65°C to +150°C Lead Temperature (soldering, 10sec) ...........................+300°CNote 1:Entire supply current for the circuit of Figure 1.MAX2181.8V to 4.25V-Powered,True RS-232 Dual Transceiver_______________________________________________________________________________________3TIMING CHARACTERISTICS(Circuit of Figure 1, V CC = 1.8V to 4.25V, C1 = 0.47µF, C2 = C3 = C4 = 1µF, L1 = 15µH, T A = T MIN to T MAX , unless otherwise noted.Typical values are at V CC = 3.0V, T A = +25°C.)______________________________________________________________Pin DescriptionReceiver InputsR2IN, R1IN 11, 12Transmitter Outputs; swing between V+ and V-.T2OUT, T1OUT13, 14Negative Supply generated on-boardV-15Terminals for Negative Charge-Pump Capacitor C1-, C1+16, 18Positive Supply generated on-boardV+19Ground. Connect all GND pins to ground.GND 5, 17, 20Supply Voltage Input; 1.8V to 4.25V. Bypass to GND with at least 1µF. See Capacitor Selection section.V CC 6Transmitter InputsT1IN, T2IN 7, 8Receiver Outputs; swing between GND and V CC.R1OUT, R2OUT 9, 10Receiver Output Enable Control. Connect to V CC for normal operation. Connect to GND to force the receiver outputs into high-Z state.EN 4Shutdown Control. Connect to V CC for normal operation. Connect to GND to shut down the power supply and to disable the drivers. Receiver status is not changed by this control.S —H —D —N–3PIN Not internally connectedN.C.2Inductor/Diode Connection Point LX 1FUNCTIONNAMEM A X 2181.8V to 4.25V-Powered,True RS-232 Dual Transceiver 4_______________________________________________________________________________________8-8TRANSMITTER OUTPUT VOLTAGE vs. LOAD CAPACITANCE AT 120kbpsLOAD CAPACITANCE (pF)T R A N S M I T T E R O U T P U T V O L T A G E (V )30000-2-6-41000200050006424000120SLEW RATE vs.TRANSMITTER CAPACITANCELOAD CAPACITANCE (pF)S L E W R A T E (V /µs )300042010002000500010864000__________________________________________Typical Operating Characteristics(Circuit of Figure 1, V CC = 1.8V, all transmitter outputs loaded with 3k Ω, T A = +25°C, unless otherwise noted.)12014001.8SUPPLY CURRENT vs. SUPPLY VOLTAGESUPPLY VOLTAGE (V)S U P P L Y C U R R E N T (m A )3.6604020 2.43.0801004.210020TRANSMITTING SUPPLY CURRENTvs. LOAD CAPACITANCELOAD CAPACITANCE (pF)S U P P L Y C U R R EN T (m A )30006050304010002000500090807040002V/divTIME TO EXIT SHUTDOWN (ONE TRANSMITTER HIGH, ONE TRANSMITTER LOW)100µs/divMAX2181.8V to 4.25V-Powered,True RS-232 Dual Transceiver_______________________________________________________________________________________5_______________Detailed DescriptionThe MAX218 line driver/receiver is intended for battery-powered EIA/TIA-232 and V.28/V.24 communications interfaces that require two drivers and two receivers.The operating voltage extends from 1.8V to 4.25V, yet the device maintains true RS-232 and EIA/TIA-562transmitter output voltage levels. This wide supply volt-age range permits direct operation from a variety of batteries without the need for a voltage regulator. For example, the MAX218 can be run directly from a single lithium cell or a pair of alkaline cells. It can also be run directly from two NiCd or NiMH cells from full-charge voltage down to the normal 0.9V/cell end-of-life point.The 4.25V maximum supply voltage allows the two rechargeable cells to be trickle- or fast-charged while driving the MAX218.The circuit comprises three sections: power supply,transmitters, and receivers. The power-supply section converts the supplied input voltage to 6.5V, providing the voltages necessary for the drivers to meet true RS-232levels. External components are small and inexpensive.The transmitters and receivers are guaranteed to oper-ate at 120kbps data rates, providing compatibility with LapLink™ and other high-speed communications soft-ware. A shutdown mode extends battery life by reduc-ing supply current to 0.04µA. While shut down, all receivers can either remain active or be disabled under logic control. With this feature, the MAX218 can be in low-power shutdown mode and still monitor activity on external devices. Three-state drivers are provided on both receiver outputs.Switch-Mode Power SupplyThe switch-mode power supply uses a single inductor with one diode and three small capacitors to generate ±6.5V from an input voltage in the 1.8V to 4.25V range.Inductor SelectionUse a 15µH inductor with a saturation current rating of at least 350mA and less than 1Ωresistance. Table 1 lists suppliers of inductors that meet the 15µH/350mA/1Ωspecifications.Diode SelectionKey diode specifications are fast recovery time (<10ns),average current rating (>100mA), and peak current rat-ing (>350mA). Inexpensive fast silicon diodes, such as the 1N6050, are generally recommended. More expen-sive Schottky diodes improve efficiency and give slightly better performance at very low V CC voltages. Table 1lists suppliers of both surface-mount and through-hole diodes. 1N914s are usually satisfactory, but specifica-tions and performance vary widely with different manu-facturers.Capacitor SelectionUse capacitors with values at least as indicated in Figure 1. Capacitor C2 determines the ripple on V+,but not the absolute voltage. Capacitors C1 and C3determine both the ripple and the absolute voltage of V-. Bypass V CC to GND with at least 1µF (C4) placed close to pins 5 and 6. If the V CC line is not bypassed elsewhere (e.g., at the power supply), increase C4 to 4.7µF.You may use ceramic or polarized capacitors in all locations. If you use polarized capacitors, tantalum types are preferred because of the high operating fre-quency of the power supplies (about 250kHz). If alu-minum electrolytics are used, higher capacitance val-ues may be required.™ LapLink is a trademark of Traveling Software, Inc.Figure 1.Single-Supply OperationM A X 2181.8V to 4.25V-Powered,True RS-232 Dual Transceiver 6_______________________________________________________________________________________RS-232 DriversThe two drivers are identical, and deliver EIA/TIA-232E and EIA/TIA-562 output voltage levels when V DD is between 1.8V and 4.25V. The transmitters drive up to 3k Ωin parallel with 1000pF at up to 120kbps. Connect unused driver inputs to either GND or V CC . Disable the drivers by taking S —H —D —N –low. The transmitter outputs areforced into a high-impedance state when S —H —D —N –is low.RS-232 ReceiversThe two receivers are identical, and accept both EIA/TIA-232E and EIA/TIA-562 input signals. The CMOS receiver outputs swing rail-to-rail. When EN is high, the receivers are active regardless of the state of S —H —D —N –. When EN is low, the receiver outputs are put into a high-impedance state. This allows two RS-232ports (or two ports of different types) to be wired-ORed at the UART.Operating ModesS —H —D —N –and EN determine the MAX218’s mode of opera-tion, as shown in Table 2.Table 2. Operating ModesShutdown When S —H —D —N –is low, the power supplies are disabled and the transmitters are put into a high-impedance state.Receiver operation is not affected by taking S —H —D —N –low.Power consumption is dramatically reduced in shutdown mode. Supply current is minimized when the receiver inputs are static in any of three states: floating (ground),GND, or V CC .__________Applications InformationOperation from Regulated/UnregulatedDual System Power Supplies The MAX218 is intended for use with three different power-supply sources: it can be powered directly from a battery, from a 3.0V or 3.3V power supply, or simulta-neously from both. Figure 1 shows the single-supply configuration. Figure 2 shows the circuit for operation from both a 3V supply and a raw battery supply—an ideal configuration where a regulated 3V supply is being derived from two cells. In this application, the MAX218’s logic levels remain appropriate for interface with 3V logic, yet most of the power for the MAX218 is drawn directly from the battery, without suffering the efficiency losses of the DC-DC converter. This pro-longs battery life.Bypass the input supplies with 0.1µF at V CC (C4) and at least 1µF at the inductor (C5). Increase C5 to 4.7µF if the power supply has no other bypass capacitor con-nected to it.Table 1. Suggested Component SuppliersMAX2181.8V to 4.25V-Powered,True RS-232 Dual Transceiver_______________________________________________________________________________________7Low-Power OperationThe following suggestions will help you get maximum life out of your batteries.Shut the MAX218 down when it is not being used for transmission. The receivers can remain active when the MAX218 is shut down, to alert your system to exter-nal activity.Transmit at the highest practical data rate. Although this raises the supply current while transmission is in progress, the transmission will be over sooner. As long as the MAX218 is shut down as soon as each transmis-sion ends, this practice will save energy.Operate your whole system from the raw battery volt-age rather than suffer the losses of a regulator or DC-DC converter. If this is not possible, but your system is powered from two cells and employs a 3V DC-DC con-verter to generate the main logic supply, use the circuit of Figure 2. This circuit draws most of the MAX218’spower straight from the battery, but still provides logic-level compatibility with the 3V logic.Keep communications cables short to minimize capaci-tive loading. Lowering the capacitive loading on the transmitter outputs reduces the MAX218’s power con-sumption. Using short, low-capacitance cable also helps transmission at the highest data rates.Keep the S —H —D —N –pin low while power is being applied tothe MAX218, and take S —H —D —N –high only after V CC has risen above about 1.5V. This avoids active operation at very low voltages, where currents of up to 150mA can be drawn. This is especially important with systems pow-ered from rechargeable cells;if S —H —D —N –is high while the cells are being trickle charged from a deep discharge,the MAX218 could draw a significant amount of the charging current until the battery voltage rises above 1.5V.Pin Configuration ChangeThe Pin Configuration shows pin 2 as N.C. (no con-nect). Early samples had a bypass capacitor for the internal reference connected to pin 2, which was labeled REF. This bypass capacitor proved to be unnecessary and the connection has been omitted. Pin 2 may now be connected to ground, left open, or bypassed to GND with a capacitor.EIA/TIA-232E and_____________EIA/TIA-562 StandardsRS-232 circuits consume much of their power because the EIA/TIA-232E standard demands that the transmit-ters deliver at least 5V to receivers with impedances that can be as low as 3k Ω. For applications where power consumption is critical, the EIA/TIA-562 standard provides an alternative.EIA/TIA-562 transmitter output voltage levels need only reach ±3.7V, and because they have to drive the same 3k Ωreceiver loads, the total power consumption is con-siderably reduced. Since the EIA/TIA-232E and EIA/TIA-562 receiver input voltage thresholds are the same, interoperability between EIA/TIA-232E and EIA/TIA-562 devices is guaranteed. Maxim’s MAX560and MAX561 are EIA/TIA-562 transceivers that operate on a single supply from 3.0V to 3.6V, and the MAX562transceiver operates from 2.7V to 5.25V while produc-ing EIA/TIA-562 levels.Figure 2.Operating from Unregulated and Regulated SuppliesMaxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.8___________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 (408) 737-7600©1995 Maxim Integrated ProductsPrinted USAis a registered trademark of Maxim Integrated Products.M A X 2181.8V to 4.25V-Powered,True RS-232 Dual Transceiver ___________________Chip TopographyTRANSISTOR COUNT: 571SUBSTRATE CONNECTED TO GNDC1+GND T1OUT SHDN ENT2OUTGND T1INLXV+R2IN R1OUTT2IN R2OUT0.101" (2.565mm)0.122" (3.099mm)R1IN C1-V-GNDVCC______3V-Powered EIA/TIA-232 and EIA/TIA-562 Transceivers from Maxim。

MAX4851ETE-T中文资料

General DescriptionThe MAX4851/MAX4851H /MAX4853/MAX4853H family of quad single-pole/single-throw (SPST) switches oper-ates from a single +2V to +5.5V supply and can handle signals greater than the supply rail. These switches fea-ture low 3.5Ωon-resistance with 40pF on-capacitance or 7Ωon-resistance with 30pF on-capacitance, making them ideal for switching audio and data signals.The MAX4851/MAX4851H are configured with four SPST switches and feature a comparator for head-phone detection or mute/send key functions. The MAX4853/MAX4853H have four SPST switches but do not include a comparator.For over-rail applications, these devices offer either the pass-through or high-impedance option. For the MAX4851/ MAX4853, signals greater than the positive supply (up to 5.5V) pass through the switch without dis-tortion. For the MAX4851H/MAX4853H, the switch input becomes high impedance when the input signal exceeds the supply rail.The MAX4851/MAX4851H /MAX4853/MAX4853H are available in the space-saving, 16-pin, 3mm x 3mm thin QFN package and operate over the -40°C to +85°C extended temperature range.ApplicationsUSB Switching Audio Signal Routing Cellular Phones Notebook ComputersPDAs and Other Handheld DevicesFeatures♦USB 2.0 Full Speed (12Mbps) and USB 1.1 Signal Switching ♦Switch Signals Greater than V CC ♦+2V to +5.5V Supply Range ♦3.5Ω/7ΩOn-Resistance♦30pF On-Capacitance (7ΩSwitch)♦150MHz -3dB Bandwidth ♦1.8V Logic Compatibility ♦Low Supply Current0.01µA (MAX4853)5µA (MAX4851)10µA (MAX4851H/MAX4853H)♦Low 0.01nA Leakage Current♦Available in a Space-Saving 3mm x 3mm, 16-Pin TQFN PackageMAX4851/MAX4851H/MAX4853/MAX4853H3.5Ω/7ΩQuad SPST Switches with Over-RailSignal Handling________________________________________________________________Maxim Integrated Products 1Ordering InformationBlock Diagram/Truth Table19-3471; Rev 0; 10/04For pricing, delivery, and ordering information,please contact Maxim/Dallas Direct!at 1-888-629-4642, or visit Maxim’s website at .*EP = Exposed paddle.Pin Configurations and Typical Operating Circuit appear at end of data sheetM A X 4851/M A X 4851H /M A X 4853/M A X 4853H3.5Ω/7ΩQuad SPST Switches with Over-Rail Signal Handling 2_______________________________________________________________________________________ABSOLUTE MAXIMUM RATINGSStresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.V CC , IN_, CIN, COM_, NO_ to GND (Note 1)........-0.3V to +6.0V COUT..........................................................-0.3V to (V CC + 0.3V)COUT Continuous Current................................................±20mA Closed-Switch Continuous Current COM_, NO_, NC_3.5ΩSwitch ................................................................±100mA 7ΩSwitch .....................................................................±50mA Peak Current COM_, NO_ (pulsed at 1ms, 50% duty cycle)3.5ΩSwitch ................................................................±200mA 7ΩSwitch ...................................................................±100mAPeak Current COM_, NO_ (pulsed at 1ms, 10% duty cycle)3.5ΩSwitch ................................................................±240mA 7ΩSwitch ...................................................................±120mA Continuous Power Dissipation (T A = +70°C)16-Pin Thin QFN (derate 20.8mW/°C above +70°C)...1667mW Operating Temperature Range ...........................-40°C to +85°C Junction Temperature......................................................+150°C Storage Temperature Range.............................-65°C to +150°C Lead Temperature (soldering, 10s).................................+300°CELECTRICAL CHARACTERISTICS(V= +2.7V to +5.5V, T = -40°C to +85°C, unless otherwise noted. Typical values are at V = +3.0V, T = +25°C, unless other-Note 1:Signals on IN_, NO_, or COM_ below GND are clamped by internal diodes. Limit forward-diode current to maximum currentrating.MAX4851/MAX4851H/MAX4853/MAX4853H3.5Ω/7Ω Quad SPST Switches with Over-RailSignal Handling_______________________________________________________________________________________3ELECTRICAL CHARACTERISTICS (continued)M A X 4851/M A X 4851H /M A X 4853/M A X 4853H3.5Ω/7ΩQuad SPST Switches with Over-Rail Signal Handling 4_______________________________________________________________________________________ELECTRICAL CHARACTERISTICS (continued)perature range.Note 3:Guaranteed by design and characterization; not production tested.Note 4:∆R ON = R ON(MAX)- R ON(MIN).Note 5:Flatness is defined as the difference between the maximum and minimum value of on-resistance as measured over thespecified analog signal ranges.Note 6:Off-isolation = 20log 10(V COM_/ V NO_), V COM_= output, V NO_= input to off switch.MAX4851/MAX4851H/MAX4853/MAX4853H3.5Ω/7Ω Quad SPST Switches with Over-RailSignal Handling_______________________________________________________________________________________5MAX4851/MAX4853ON-RESISTANCE vs. COM VOLTAGECOM VOLTAGE (V)O N -R E S I S T A N C E (Ω)4212345678910006MAX4851/MAX4853ON-RESISTANCE vs. COM VOLTAGECOM VOLTAGE (V)O N -R E S I S T A N C E (Ω)421.01.52.02.53.03.54.04.50.506MAX4851/MAX4853ON-RESISTANCE vs. COM VOLTAGECOM VOLTAGE (V)O N -R E S I S T A N C E (Ω)421.01.52.02.53.03.50.506MAX4851H/MAX4853HON-RESISTANCE vs. COM VOLTAGECOM VOLTAGE (V)O N -R E S I S T A N C E (Ω)4212345678910006MAX4851H/MAX4853HON-RESISTANCE vs. COM VOLTAGECOM VOLTAGE (V)O N -R E S I S T A N C E (Ω)2.52.00.51.01.51.52.02.53.03.54.04.55.01.03.0MAX4851H/MAX4853HON-RESISTANCE vs. COM VOLTAGECOM VOLTAGE (V)O N -R E S I S T A N C E (Ω)43211.01.52.02.53.03.50.505MAX4853ON-RESISTANCE vs. COM VOLTAGECOM VOLTAGE (V)O N -R E S I S T A N C E (Ω)4251015202530354045006MAX4853ON-RESISTANCE vs. COM VOLTAGECOM VOLTAGE (V)O N -R E S I S T A N C E (Ω)42345678206MAX4853ON-RESISTANCE vs. COM VOLTAGECOM VOLTAGE (V)O N -R E S I S T A N C E (Ω)541232.02.53.03.54.04.55.05.51.56Typical Operating Characteristics(V CC = 3.0V, T A = +25°C, unless otherwise noted.)M A X 4851/M A X 4851H /M A X 4853/M A X 4853H3.5Ω/7ΩQuad SPST Switches with Over-Rail Signal Handling 6_______________________________________________________________________________________MAX4853HON-RESISTANCE vs. COM VOLTAGECOM VOLTAGE (V)O N -R E S I S T A N C E (Ω)4251015202530354045006MAX4853HON-RESISTANCE vs. COM VOLTAGECOM VOLTAGE (V)O N -R E S I S T A N C E (Ω)2.52.01.51.00.5345678203.0MAX4853HON-RESISTANCE vs. COM VOLTAGECOM VOLTAGE (V)O N -R E S I S T A N C E (Ω)43122.02.53.03.54.04.55.05.51.55MAX4851SUPPLY CURRENT vs. SUPPLY VOLTAGESUPPLY VOLTAGE (V)S U P P L Y C U R R E N T (µA )5.04.54.03.53.02.52.02.53.03.54.04.55.05.52.01.55.5MAX4851HSUPPLY CURRENT vs. SUPPLY VOLTAGE3456782SUPPLY VOLTAGE (V)S U P P L Y C U R R E N T(µA )5.04.54.03.53.02.52.01.55.50.20.40.60.81.0MAX4853SUPPLY CURRENT vs. SUPPLY VOLTAGESUPPLY VOLTAGE (V)S U P P L Y C U R R E N T (n A)5.04.54.03.53.02.52.01.55.55.05.56.06.57.07.58.04.5MAX4853HSUPPLY CURRENT vs. SUPPLY VOLTAGESUPPLY VOLTAGE (V)S U P P L YC U R R E N T (µA )5.04.54.03.53.02.52.01.55.5TURN-ON/TURN-OFF TIME vs. SUPPLY VOLTAGESUPPLY VOLTAGE (V)T U R N -O N /T U R N -O F F T I M E (n s)4.53.52.510203040506001.5 5.5TURN-ON/TURN-OFF TIME vs. TEMPERATURETEMPERATURE (°C)T U R N -O N /T U R N -O F F T I M E (n s )603510-152224262830323420-4085Typical Operating Characteristics (continued)(V CC = 3.0V, T A = +25°C, unless otherwise noted.)MAX4851/MAX4851H/MAX4853/MAX4853H3.5Ω/7Ω Quad SPST Switches with Over-RailSignal Handling_______________________________________________________________________________________7TURN-ON/TURN-OFF TIME vs. SUPPLY VOLTAGESUPPLY VOLTAGE (V)T U R N -O N /T U R N -O F F T I M E (n s )4.53.52.510203040506001.55.5TURN-ON/TURN-OFF TIME vs. TEMPERATURETEMPERATURE (°C)T U R N -O N /T U R N -O F F T I M E (n s )603510-152224262830323420-4085LOGIC THRESHOLD vs. SUPPLY VOLTAGESUPPLY VOLTAGE (V)L O G I C T H R E S H O L D (V )4.53.52.50.81.01.21.41.60.61.55.5CHARGE INJECTION vs. COM VOLTAGECOM VOLTAGE (V)C H A R G E I N J E C T I O N (p C )4321102030005CHARGE INJECTION vs. COM VOLTAGECOM VOLTAGE (V)C H A R G E I N J E C T I O N (p C )43211020305LEAKAGE CURRENT vs. TEMPERATURETEMPERATURE (°C)L E A K A G E C U R R E N T (n A )603510-150.20.40.60.81.01.21.40-4085LEAKAGE CURRENT vs. TEMPERATURETEMPERATURE (°C)L E A K A G E C U R R E N T (n A )6035-15100.20.40.60.81.01.21.41.60-4085FREQUENCY RESPONSEFREQUENCY (MHz)F R E Q U E N C Y R E S P O N S E (d B )100101-80-60-40-20020-1000.11000FREQUENCY RESPONSEFREQUENCY (MHz)F R E Q U E N C Y R E S P O N S E (d B )100101-80-60-40-20020-1000.11000Typical Operating Characteristics (continued)(V CC = 3.0V, T A = +25°C, unless otherwise noted.)M A X 4851/M A X 4851H /M A X 4853/M A X 4853H3.5Ω/7ΩQuad SPST Switches with Over-Rail Signal Handling 8_______________________________________________________________________________________TOTAL HARMONIC DISTORTIONvs. FREQUENCYFREQUENCY (Hz)T H D (%)10k1k 1000.110100k10.01TOTAL HARMONIC DISTORTIONvs. FREQUENCYFREQUENCY (Hz)T H D (%)10k1k 1000.110100k10.01(MAX4851/MAX4851H) COMPARATOR THRESHOLD vs. TEMPERATURETEMPERATURE (°C)C O M P A R A T O R T H R E S H O LD (V )603510-151.021.041.061.081.101.00-4085COMPARATOR THRESHOLDvs. TEMPERATURETEMPERATURE (°C)C O M P A R A T O R T H R E S H O L D (V )603510-151.6251.6501.6751.7001.7251.7501.600-4085MAX4851/MAX4853SWITCH PASSING SIGNALS ABOVE SUPPLY VOLTAGEV NC 2V/div 0VV COM 0V200µs/divV CC = 3.0VMAX4851H/MAX4853H SWITCH ENTERING HIGH-IMPEDANCE STATE200µs/divV NC 2V/div 0VV COM 0VV CC = 3.0VHI-Z STATE HI-Z STATETypical Operating Characteristics (continued)(V CC = 3.0V, T A = +25°C, unless otherwise noted.)Detailed Description The MAX4851/MAX4851H/MAX4853/MAX4853H are low on-resistance, low-voltage, analog switches that operate from a +2V to +5.5V single supply and are fully specified for nominal 3.0V applications. The MAX4851/MAX4853 devices feature over-rail signal capability that allows sig-nals up to 5.5V with supply voltages down to 2.0V to pass through without distortion. The MAX4851H/ MAX4853H enter high-impedance mode when the signal voltage exceeds V CC and return to normal operation when the signal voltage drops below V CC.tance, which allows switching of the data signals for USB 2.0/1.1 applications (12Mbps). They are designed to switch D+ and D- USB signals with a guaranteed skew of less than 1ns (see Figure 2), as measured from 50% of the input signal to 50% of the output signal.The MAX4851_ features a comparator that can be used for headphone or mute detection. The comparator threshold is internally generated to be approximately 1/3 of V CC.3.5Ω/7ΩQuad SPST Switches with Over-RailSignal Handling_______________________________________________________________________________________9MAX4851/MAX4851H/MAX4853/MAX4853H Pin DescriptionM A X 4851/M A X 4851H /M A X 4853/M A X 4853H3.5Ω/7ΩQuad SPST Switches with Over-Rail Signal Handling 10______________________________________________________________________________________Test Circuits/Timing DiagramsFigure 1. Switching TimeFigure 2. Input/Output Skew Timing DiagramMAX4851/MAX4851H/MAX4853/MAX4853H3.5Ω/7Ω Quad SPST Switches with Over-RailSignal Handling______________________________________________________________________________________11Figure 3. Charge InjectionTest Circuits/Timing Diagrams (continued)M A X 4851/M A X 4851H /M A X 4853/M A X 4853HApplications InformationDigital Control InputsThe logic inputs (IN_) accept up to +5.5V even if the supply voltages are below this level. For example, with a +3.3V V CC supply, IN_ can be driven low to GND and high to +5.5V, allowing for mixing of logic levels in a sys-tem. Driving IN_ rail-to-rail minimizes power consump-tion. For a +2V supply voltage, the logic thresholds are 0.5V (low) and 1.4V (high). For a +5V supply voltage, the logic thresholds are 0.8V (low) and 1.8V (high).Analog Signal LevelsThe on-resistance of these switches changes very little for analog input signals across the entire supply volt-age range (see Typical Operating Characteristics ). The switches are bidirectional; therefore, NO_ and COM_can be either inputs or outputs.ComparatorThe positive terminal of the comparator is internally set to V CC / 3. When the negative comparator terminal (CIN) is below the threshold (V CC / 3), the comparator output (COUT) goes high. When CIN rises above V CC / 3, COUT goes low.The comparator threshold allows for detection of head-phones since headphone audio signals are typically biased to V CC / 2.Power-Supply SequencingCaution: Do not exceed the absolute maximum rat-ings because stresses beyond the listed ratings may cause permanent damage to the device.Proper power-supply sequencing is recommended for all CMOS devices. Always apply V CC before applying analog signals, especially if the analog signal is not current limited.3.5Ω/7ΩQuad SPST Switches with Over-Rail Signal HandlingFigure 5. Channel Off-/On-CapacitanceFigure 6. Comparator Switching TimeSelector GuideMAX4851/MAX4851H/MAX4853/MAX4853H3.5Ω/7Ω Quad SPST Switches with Over-RailSignal Handling______________________________________________________________________________________13Pin ConfigurationsTypical Operating CircuitChip InformationTRANSISTOR COUNT: 735PROCESS: CMOSM A X 4851/M A X 4851H /M A X 4853/M A X 4853H3.5Ω/7ΩQuad SPST Switches with Over-Rail Signal Handling Maxim cannot assume responsib ility for use of any circuitry other than circuitry entirely emb odied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.14____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600©2004 Maxim Integrated ProductsPrinted USAis a registered trademark of Maxim Integrated Products.Package Information(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information,go to /packages .)。

MAX5944ESE+;MAX5944ESE+T;中文规格书,Datasheet资料

PARAMETER SUPPLIES Supply Voltage Range Supply Current Shutdown Current IN_ Default Undervoltage Lockout IN_ Default UndervoltageLockout Hysteresis
ON_ Undervoltage-Lockout Threshold
Continuous Power Dissipation (TA = +70°C) 16-Pin SO (derate 9.1mW/°C above +70°C)................728mW
Operating Temperature Range ...........................-40°C to +85°C Maximum Junction Temperature .....................................+150°C Storage Temperature Range .............................-60°C to +150°C ESD Rating (Human Body Model)......................................2000V Lead Temperature (soldering, 10s) .................................+300°C
Undervoltage Lockout Programming ♦ Fast Load Disconnect Control Through
ON/OFF Inputs ♦ Bidirectional Load Disconnect ♦ Power Routing from One Port to Another

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SHUTDOWN MODE Yes Yes No Yes No Yes No No
OPTIMIZED FOR AV ≥ 2 AV ≥ 1 AV ≥ 2 AV ≥ 2 AV ≥ 1 AV ≥ 1 AV ≥ 2 AV ≥ 1
VEE 2
MAX4180#43; 3
4
IN-
SOT23-6 Pin Configurations continued at end of data sheet.
PART MAX4180EUT-T MAX4180ESA
Ordering Information
TEMP RANGE -40°C to +85°C -40°C to +85°C PINPACKAGE 6 SOT23-6 8 SO TOP MARK AAAB —
Ordering Information continued at end of data sheet.
________________________________________________________________ Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim’s website at .
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
DC ELECTRICAL CHARACTERISTICS—Dual Supplies
(VCC = +5V, VEE = -5V, VIN+ = 0, SHDN ≥ 3V; TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1) PARAMETER Input Voltage Range Input Offset Voltage Input Offset-Voltage Drift Input Offset-Voltage Matching Input Bias Current (Positive Input) Input Bias Current (Negative Input) Input Resistance (Positive Input) Input Resistance (Negative Input) Common-Mode Rejection Ratio Open-Loop Transresistance IB+ IBRIN+ RINCMRR TR -3.6V ≤ VCM ≤ 3.6V RL = 1kΩ, VOUT = ±3.6V RL = 150Ω, VOUT = ±2.5V RL = 1kΩ Output Voltage Swing Output Current Output Short-Circuit Current Output Resistance Disabled Output Leakage Current SHDN Logic Low Threshold SHDN Logic High Threshold VSW IOUT ISC ROUT IOUT(OFF) VIL VIH SHDN ≤ VIL, VOUT ≤ ±3V (Notes 2, 4) (Notes 3, 4) (Notes 3, 4) VCC - 2.0 RL = 150Ω RL = 100Ω RL = 30Ω ±32 -50 0.8 0.3 ±3.75 ±3.0 -3.6V ≤ VIN+ ≤ 3.6V, -1V ≤ (VIN+ - VIN-) ≤ 1V 250 SYMBOL VCM VOS TCVOS MAX4182–MAX4187 VCM = 0 CONDITIONS Guaranteed by CMRR test MIN ±3.6 TYP ±3.9 ±1.5 ±12 ±1 ±1 ±1 800 160 -58 3.0 0.9 ±4.0 ±3.3 ±3.0 ±60 ±80 0.2 ±0.1 ±6.0 VCC - 3.0 mA mA Ω µA V V V ±7 ±12 ±7 MAX UNITS V mV µV/°C mV µA µA kΩ Ω dB MΩ
元器件交易网
Single/Dual/Quad, 270MHz, 1mA, SOT23, Current-Feedback Amplifiers with Shutdown MAX4180–MAX4187
ABSOLUTE MAXIMUM RATINGS
Supply Voltage (VCC to VEE) .................................................12V Analog Input Voltage.......................(VEE - 0.3V) to (VCC + 0.3V) Differential Input Voltage.......................................................±2V SHDN Input Voltage ........................(VEE - 0.3V) to (VCC + 0.3V) Short-Circuit Duration (OUT to GND, VCC or VEE).....Continuous Continuous Power Dissipation (TA = +70°C) 6-Pin SOT23 (derate 7.10mW/°C above +70°C)...........571mW 8-Pin SO (derate 5.88mW/°C above +70°C).................471mW 10-Pin µMAX (derate 5.60mW/°C above +70°C) ..........444mW 14-Pin SO (derate 8.33mW/°C above +70°C)...............667mW 16-Pin QSOP (derate 8.30mW/°C above +70°C)..........667mW Operating Temperature Range ...........................-40°C to +85°C Storage Temperature Range .............................-65°C to +150°C Lead Temperature (soldering, 10s) .................................+300°C
Features
o Ultra-Low Supply Current: 1mA per Amplifier o Shutdown Mode Outputs Placed in High-Z Supply Current Reduced to 135µA o Operate from a Single +5V Supply or Dual ±5V Supplies o Wide Bandwidth 270MHz -3dB Small-Signal Bandwidth (MAX4181/MAX4184/MAX4185/MAX4187) o 450V/µs Slew Rate o Fast, 20ns Settling Time to 0.1% o Excellent Video Specifications Gain Flatness to 70MHz (MAX4180/MAX4182/MAX4183/MAX4186) 0.08%/0.03° Differential Gain/Phase o Low Distortion: -73dBc SFDR (fC = 5MHz, VOUT = 2Vp-p) o Available in Tiny Surface-Mount Packages 6-Pin SOT23 (MAX4180/MAX4181) 10-Pin µMAX (MAX4183/MAX4185) 16-Pin QSOP (MAX4186/MAX4187)
Pin Configurations Selector Guide
TOP VIEW SINGLE
OUT 1 6 VCC
PART MAX4180 MAX4181 MAX4182 MAX4183 MAX4184 MAX4185 MAX4186 MAX4187
NO. OF AMPS 1 1 2 2 2 2 4 4
元器件交易网
19-1221; Rev 3; 8/01
Single/Dual/Quad, 270MHz, 1mA, SOT23, Current-Feedback Amplifiers with Shutdown
General Description