MAX6389XS22D1-T中文资料

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MAX832中文资料

NUAL KIT MA ATION U EET L H A S V A E T WS DA FOLLO
___________________________Features
o Input Range: Up to 30V o 1A On-Chip Power Switch o Adjustable Output (MAX830) Fixed Outputs: 5V (MAX831) 3.3V (MAX832) 3V (MAX833) o 100kHz Switching Frequency o Excellent Dynamic Characteristics o Few External Components o 8mA Quiescent Current o 16-Pin SO Package o Evaluation Kit Available
__________Typical Operating Circuit
__________________Pin Configuration
TOP VIEW
INPUT 8V TO 30V 100µF VIN VSW
100µH*
OUTPUT 5V AT 1A
V IN 1 V IN 2 V IN 3
16 V SW 15 V SW 14 V SW
_______________________Applications
Distributed Power from High-Voltage Buses High-Current, High-Voltage Step-Down Applications Multiple-Output Buck Converter
MAX831
VC 10k 0.047µF SENSE

MAX809中文资料_数据手册_参数

MAX809R/S/T/Z VCC < 3.6 V; MAX810R/S/T/Z Tamb = –40 °C to +85 °C
MAX809J/L/M MAX810J/L/M
VCC < 5.5 V; Tamb = +85 °C to +105 °C
MAX809R/S/T/Z VCC < 3.6 V; MAX810R/S/T/Z Tamb = +85 °C to +105 °C
2003 Aug 08
4
Philips Semiconductors
3-pin microprocessor resets
Product data
MAX809/MAX810
ELECTRICAL CHARACTERISTICS
VCC = full range (Tamb = –40 °C to +105 °C) unless otherwise noted; typical values are at Tamb = +25 °C, and VCC = 5 V (J/L/M versions), VCC = 3.3 V (T/S versions), VCC = 3 V (R version), and VCC = 2.5 V (Z version) (Note 1).
TEMPERATURE RANGE
–40 to +105 °C –40 to +105 °C –40 to +105 °C –40 to +105 °C
Part number
MAX809
MAX809ZD, MAX809ZW
MAX809RD, MAX809RW

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 .)。

MAX9939中文资料

General DescriptionThe MAX9939 is a general-purpose, differential-input programmable-gain amplifier (PGA) that is ideal for con-ditioning a variety of wide dynamic range signals such as those found in motor current-sense, medical instru-mentation, and sonar data acquisition applications. I t features SPI ™-programmable differential gains from 0.2V/V to 157V/V, input offset-voltage compensation, and an output amplifier that can be configured either as a high-order active filter or to provide a differential output.The PGA is optimized for high-signal bandwidth and its gain can be programmed to be 0.2V/V, 1V/V, 10V/V,20V/V, 30V/V, 40V/V, 60V/V, 80V/V, 119V/V, and 157V/V.Precision resistor matching provides extremely low gain tempco and high CMRR. Although the MAX9939 oper-ates from a single supply V CC between 2.9V to 5.5V, it can process signals both above and below ground due to the use of an input level-shifting amplifier stage.Furthermore, its inputs are protected to ±16V, allowing it to withstand fault conditions and signal overranges.The output amplifier is designed for high bandwidth and low-bias currents, making it ideal for use in multi-ple-feedback active filter topologies that offer much higher Qs and stopband attenuation than Sallen-Key architectures.The MAX9939 draws 3.4mA of quiescent supply current at 5V, and includes a software-programmable shut-down mode that reduces its supply current to only 13µA. The MAX9939 is available in a 10-pin µMAX ®package and operates over the -40°C to +125°C auto-motive temperature range.ApplicationsSensorless Motor Control Medical Signal ConditioningSonar and General Purpose Data Acquisition Differential to Single-Ended Conversion Differential-Input, Differential-Output Signal AmplificationSensor Interface and Signal ProcessingFeatures♦SPI-Programmable Gains: 0.2V/V to 157V/V♦Extremely Low Gain Tempco♦Integrated Amplifier for R/C Programmable Active Filter ♦Input Offset-Voltage Compensation ♦Input Protection to ±16V ♦13µA Software Shutdown Mode♦-40°C to +125°C Operating Temperature Range ♦10-Pin µMAX PackageMAX9939SPI Programmable-Gain Amplifierwith Input Vos Trim and Output Op Amp________________________________________________________________Maxim Integrated Products119-4329; Rev 0; 11/08Ordering InformationFor pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,or visit Maxim's website at .+Denotes a lead-free/RoHS-compliant package.Functional Diagram appears at end of data sheet.SPI is a trademark of Motorola, Inc.µMAX is a registered trademark of Maxim Integrated Products, Inc.Pin ConfigurationM A X 9939SPI Programmable-Gain Amplifierwith Input Vos Trim and Output Op Amp 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 to GND..............................................................-0.3V to +6V INB, OUTA, OUTB, SCLK, DIN, CS ............-0.3V to (V CC + 0.3V)INA+, INA- to GND..................................................-16V to +16V Output Short-Circuit Current Duration........................Continuous Continuous Input Current into Any Terminal.....................±20mA Continuous Power Dissipation (T A = +70°C)10-Pin µMAX (derate 5.6mW/°C above +70°C)...........707mWOperating Temperature Range .........................-40°C to +125°C Junction Temperature......................................................+150°C Storage Temperature Range.............................-65°C to +150°C Lead Temperature (soldering, 10s).................................+300°CELECTRICAL CHARACTERISTICSMAX9939SPI Programmable-Gain Amplifierwith Input Vos Trim and Output Op Amp_______________________________________________________________________________________3CC Note 3:For gain of 0.25V/V, the input common-mode range is -1V to V CC - 2V.Note 4:The input current of a CMOS device is too low to be accurately measured on an ATE and is typically on the order of 1pA.Note 5:Parts are functional with f SCLK = 10MHz.ELECTRICAL CHARACTERISTICS (continued)(V CC = 5V, V GND = 0, V INA+= V INA-, Gain = 10V/V, R OUTA = R OUTB = 1k Ωto V CC /2, T A = T MIN to T MAX , unless otherwise noted.Typical values are at T = +25°C.) (Note 1)M A X 9939SPI Programmable-Gain Amplifierwith Input Vos Trim and Output Op Amp 4_______________________________________________________________________________________Figure 1. SPI Interface Timing DiagramTypical Operating Characteristics(V CC = 5V, V GND = 0, V IN+= V IN-= 0, Gain = 10V/V, R OUTA = R OUTB = 1k Ωto V CC /2, T A = +25°C, unless otherwise noted.)PGA GAIN vs. FREQUENCYFREQUENCY (MHz)G A I N (d B )10.110-60-40-200204060-800.01100PGA GAIN vs. FREQUENCYFREQUENCY (MHz)G A I N (d B )10.1-3-2-10123-40.0110AMPLIFIER B GAIN vs. FREQUENCYFREQUENCY (MHz)G A I N (d B )10.110-60-40-200204060-800.01100AMPLIFIER B GAIN vs. FREQUENCYFREQUENCY (MHz)G A I N (d B )10.1-3-2-10123-40.0110COMMON-MODE REJECTION RATIOvs. FREQUENCYFREQUENCY (MHz)C M R R (d B )1010.010.1-70-60-50-40-30-20-100-800.001100GAIN ERROR vs. TEMPERATUREM A X 9939 t o c 06TEMPERATURE (°C)G A I N E R R O R (%)1109580655035205-10-250.050.100.150.20-40125MAX9939SPI Programmable-Gain Amplifierwith Input Vos Trim and Output Op Amp_______________________________________________________________________________________5Typical Operating Characteristics (continued)(V CC = 5V, V GND = 0, V IN+= V IN-= 0, Gain = 10V/V, R OUTA = R OUTB = 1k Ωto V CC /2, T A = +25°C, unless otherwise noted.)INPUT V OS vs. TEMPERATUREM A X 9939 t o c 07TEMPERATURE (°C)O F F S E T (m V )1109580655035205-10-250.51.01.52.02.53.00-401251ms/divINPUT V OS TRIM RESPONSEOUTA 10mV/divGAIN = 1V/VDIFFERENTIAL PSRR vs. FREQUENCYFREQUENCY (kHz)P S R R (d B )1001-80-60-40-20-1000.0110,000100.11000TOTAL HARMONIC DISTORTIONvs. FREQUENCYFREQUENCY (kHz)D I S T O R T I O N (d B )0.110-100-80-60-40-200-1200.011001NOISE VOLTAGE DENSITYFREQUENCY (Hz)N O I S E D E N S I T Y (n V /√H z )10010,000100010010,0001010100,0001000NOISE VOLTAGE DENSITYFREQUENCY (Hz)N O I S E D E N S I T Y (n V /√H z )10010,00010010001010100,0001000M A X 9939SPI Programmable-Gain Amplifierwith Input Vos Trim and Output Op Amp 6_______________________________________________________________________________________1μs/div RECOVERY FROM INPUT OVERLOAD(PGA, GAIN = 1V/V)INA+ - INA-2V/divMAX9939 toc15OUTA1V/div 400ns/divRECOVERY FROM INPUT OVERLOAD(PGA, GAIN = 157V/V)INA+ - INA-2mV/divMAX9939 toc16OUTA1V/div1μs/divRECOVERY FROM INPUT OVERLOAD(OUTPUT AMPLIFIER)IN 2V/divMAX9939 toc17OUTB 2V/div200μs/divGAIN ADJUST RESPONSEINA+ - INA-2mV/divOUTA 1V/divGAIN = 157V/VGAIN = 40V/VGAIN = 10V/V GAIN = 1V/VTypical Operating Characteristics (continued)(V CC = 5V, V GND = 0, V IN+= V IN-= 0, Gain = 10V/V, R OUTA = R OUTB = 1k Ωto V CC /2, T A = +25°C, unless otherwise noted.)2001004003006005007009008001000406020801001201401601% SETTLING TIME vs. GAIN (PGA)GAIN (V/V)S E T T L I N G T I M E (n s )OUTPUT IMPEDANCE vs. FREQUENCYFREQUENCY (MHz)I M P E D A N C E (Ω)10.10.010.11101000.010.00110MAX9939SPI Programmable-Gain Amplifierwith Input Vos Trim and Output Op Amp_______________________________________________________________________________________7Detailed DescriptionThe MAX9939 is a general-purpose PGA with input off-set trim capability. I ts gain and input offset voltage(V OS ) are SPI programmable. The device also includes an uncommitted output operational amplifier that can be used as either a high-order active filter or to provide a differential output. The device can be put into shut-down through SPI.The gain of the amplifier is programmable between 0.2V/V and 157V/V. The input offset is programmable between ±17mV and can be used to regain output dynamic range in high gain settings. An input offset-volt-age measurement mode enables input offset voltage tobe calibrated out in firmware to obtain excellent DC accuracy.The main amplifier accepts a differential input and pro-vides a single-ended output. The relationship between the differential input and singled-ended output is given by the representative equation:V OUTA = V CC /2 + Gain x (V INA+- V INA-) + Gain x V OSArchitectureThe MAX9939 features three internal amplifiers as shown in the Functional Diagram . The first amplifier (amplifier LVL) is configured as a differential amplifier for differential to single-ended conversion with an input offset-voltage trim network. I t has extremely highTypical Operating Characteristics (continued)(V CC = 5V, V GND = 0, V IN+= V IN-= 0, Gain = 10V/V, R OUTA = R OUTB = 1k Ωto V CC /2, T A = +25°C, unless otherwise noted.)200μs/divCOMMON-MODE REJECTION RESPONSEINA+1V/div INA-1V/divOUTA 2V/divSHUTDOWN CURRENT vs. SUPPLY VOLTAGEM A X 9939 t o c 20VOLTAGE (V)S H U T D O W N C U R R E N T (μA )3.64.0162084122.83.24.85.24.4M A X 9939SPI Programmable-Gain Amplifierwith Input Vos Trim and Output Op Amp 8_______________________________________________________________________________________CMRR, gain accuracy, and very low temperature drift due to precise resistor matching. The output of this amplifier is level shifted to V CC /2.This amplifier is followed by a programmable-gain inverting amplifier (amplifier A) with programmable R F and R I resistors whose gain varies between 0.2V/V and 157V/V. The output of this amplifier is biased at V CC /2 and has extremely high gain accuracy and low temperature drift.The MAX9939 has an uncommitted op amp (amplifier B) whose noninverting input is referenced to V CC /2. Its inverting input and output are externally accessible,allowing it to be configured either as an active filter or as a differential output.A robust input ESD protection scheme allows input volt-ages at INA+ and INA- to reach ±16V without damag-ing the MAX9939, thus making the part extremely attractive for use in front-ends that can be exposed to high voltages during fault conditions. I n addition, its input-voltage range extends down to -V CC /2 (e.g., -2.5V when powered from a 5V single supply) allowing the MAX9939 to translate below ground signals to a 0V to 5V output signal. This feature simplifies interfacing ground-referenced signals with unipolar-input ADCs.SPI-Compatible Serial InterfaceThe MAX9939 has a write-only interface, consisting of three inputs: the clock signal (SCLK), data input (DIN),and chip-select input (CS ). The serial interface works with the clock polarity (CPOL) and clock phase (CPHA)both set to 0 (see Figure 1). I nitiating a write to the MAX9939 is accomplished by pulling CS low. Data is clocked in on the rising edge of each clock pulse, and is written LSB first. Each write to the MAX9939 consistsof 8 bits (1 byte). Pull CS high after the 8th bit has been clocked in to latch the data and before sending the next byte of instruction. Note that the internal register is not updated if CS is pulled high before the falling edge of the 8th clock pulse.Register DescriptionThe MAX9939 consists of three registers: a shift register and two internal registers. The shift register accepts data and transfers it to either of the two internal regis-ters. The two internal registers store data that is used to determine the gain, input offset voltage, and operating modes of the amplifier. The two internal registers are the Input V OS Trim register and Gain register. The format of the 8-bit write to these registers is shown in Tables 1and 2. Data is sent to the shift register LSB first.SEL: The SEL bit selects which internal register is writ-ten to. Set SEL to 0 to write bits D5:D1 to the input V OS trim register. Set SEL to 1 to write D4:D1 to the Gain register (D5 is don’t care when SEL = 1).Figure 2. SPI Interface Timing Diagram (CPOL = CPHA = 0)MAX9939SPI Programmable-Gain Amplifierwith Input Vos Trim and Output Op Amp_______________________________________________________________________________________9SHDN:Set SHDN to 0 for normal operation. Set SHDN to 1 to place the device in a low-power 13µA shutdown mode. In shutdown mode, the outputs OUTA and OUTB are high impedance, however, the SPI decode circuitry is still active. Each instruction requires a write to the SHDN bit.MEAS:The MAX9939 provides a means for measuring its own input offset voltage. When MEAS is set to 1, the I NA- input is disconnected from the input signal path and internally shorted to I NA+. This architecture thus allows the input common-mode voltage to be compen-sated at the application-specific input common-mode voltage of interest. The input offset voltage of the PGA is the output offset voltage divided by the programmed gain without any V OS trim (i.e., V3:V0 set to 0):V OS-INHERENT = (V OUTA - V CC /2)/Gain Program V OS to offset V OS-INHERENT . The input V OS also includes the effect of mismatches in the resistor-dividers. Setting MEAS to 0 switches the inputs back to the signals on INA+ and INA-. Each instruction requires a write to the MEAS bit.Programming GainThe PGA’s gain is set by the bits G3:G0 in the Gain reg-ister. Table 3 shows the relationship between the bits G3:G0 and the amplifier’s gain. The slew rate and small-signal bandwidth (SSBW) of the PGA depend on its gain setting as shown in Table 3.Programming Input Offset Voltage (V OS )The input offset voltage is set by the bits V4:V0 in the Input Offset Voltage Trim register. Bit V4 determines the polarity of the offset. Setting V4 to 0 makes the offset positive, while setting V4 to 1 makes the offset negative.Table 4 shows the relationship between V3:V0 and V OS .To determine the effect of V OS at the output of the ampli-fier for gains other than 1, use the following formula:V OUTA = V CC /2 + Gain x (V OS-INHERENT + V OS )where V OS-INHERENT is the inherent input offset voltage of the amplifier, which can be measured by setting MEAS to 1.Applications InformationUse of Output Amplifier as Active FilterThe output amplifier can be configured as a multiple-feedback active filter as shown in Figure 3, which tradi-tionally has better stopband attenuation characteristics than Sallen-Key filters. These filters also possess inher-ently better distortion performance since there are no common-mode induced effects (i.e., the common-mode voltage of the operational amplifier is always fixed at V CC /2 instead of it being signal dependent such as in Sallen-Key filters). Choose external resistors and capacitors to create lowpass, bandpass, or high-pass filters.M A X 9939SPI Programmable-Gain Amplifierwith Input Vos Trim and Output Op Amp 10______________________________________________________________________________________Differential-Input, Differential-Output PGAThe output amplifier can be configured so that the MAX9939 operates as a differential-input, differential-output programmable gain amplifier. As shown in Figure 4, use a 10k Ωresistor between OUTA and INB,and between INB and OUTB. Such a differential-output configuration is ideal for use in low-voltage applications that can benefit from the 2X output voltage dynamic range when compared to single-ended output format.Use of Output Operational Amplifier as TIACMOS inputs on the output op amp makes it ideal for use as an input transimpedance amplifier (TIA) in cer-tain current-output sensor applications. In such a situ-ation, keep in mind that the inverting input operates at fixed voltage of V CC /2. Use a high-value resistor as a feedback gain element, and use a feedback capacitor in parallel with this resistor if necessary to aid amplifi-er stability in the presence of high photodiode or cable capacitance. The output of this TIA can be rout-ed to I NA+ or I NA- for further processing and signal amplification.Power-Supply BypassingBypass V CC to GND with a 0.1µF capacitor in parallel with a 1µF low-ESR capacitor placed as close as possi-ble to the MAX9939.Table 4. Input Offset-Voltage TrimMAX9939SPI Programmable-Gain Amplifierwith Input Vos Trim and Output Op Amp______________________________________________________________________________________11Figure 3. Using the MAX9939 Output Amplifier as an Anti-Aliasing Filter (Corner Frequency = 1.3kHz) to Maximize Nyquist BandwidthM A X 9939SPI Programmable-Gain Amplifierwith Input Vos Trim and Output Op Amp 12______________________________________________________________________________________Figure 4. Using the MAX9939 as a Differential-Input, Differential-Output PGAChip InformationPROCESS: BiCMOSMAX9939SPI Programmable-Gain Amplifierwith Input Vos Trim and Output Op Amp______________________________________________________________________________________13Functional DiagramM A X 9939SPI Programmable-Gain Amplifierwith Input Vos Trim and Output Op Amp 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.14____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600©2008 Maxim Integrated Productsis a registered trademark of Maxim Integrated Products, Inc.Package InformationFor the latest package outline information and land patterns, go to /packages .。

绿色Max数字开关说明书

Leviton Manufacturing Co., Inc. Lighting & Controls20497 SW Teton Avenue, Tualatin, OR 97062 tech line 800-959-6004 fax 503-404-5594© 2020 Leviton Manufacturing Co., Inc. All rights reserved. Subject to change without notice.G r e e n M A X ®D i g i t a l S w i t c h e sGreenMAX® Digital Switches Offers Programming FlexibilityLeviton GreenMAX® Digital Switches are 100% digital. Specifically designed for use with GreenMAX Relay Control Panels, GreenMAX Digital Switches utilize LumaCAN protocolsfor unparalleled programming flexibility. All communication and monitoring functionscan be performed from any GreenMAX Digital Switch location. Simply connect the GreenMAX Handheld Display Unit (HDU) to any GreenMAX Digital Switch for easy programming and system control of all devices on the GreenMAX network. Available in 1-, 2-, 4-, 8-button and keyswitch configurations, these switches connect using RJ45 connectors and CAT6 cabling. For dimming applications, use 4-button switch with dimming module for control of0-10V dimming circuits.APPLICATIONS• Heavy retrofit applications• New construction projects• Government facilities• Office buildings• Hospitals/medical offices• Universities• Restaurants• Large campuses• Any other location where centralized lighting control, programming and monitoring are requiredFEATURES• Models include 1-, 2-, 4-, 8-button and keyswitch configurations• RJ45 connectors to provide IN and OUT connections to the LumaCAN network• Complies with energy code requirements for Title 24 2013 when used with GreenMAX Relay Systems • Any button can be configured to control0-10VDC dimming circuits• Easy-to-access port on top of switch provides connectivity for the GreenMAX HDU• Custom engraved labeling available on switch buttons and screwless wall plates- 1, 2, 4 button: up to 8 characters per two lines of text*- 8 button: up to 4 characters per one line of text*• Install a mix of GreenMAX Relay Panels, Remote Input Cabinets and Digital Switches on a single LumaCAN• Buttons can be programmed for ON, OFF, ON/OFF, dimmed raise/lower or single zone preset ON level• Status LED for each button provides true relay status• Matching screwless single-gang wall plate is supplied and digital switches are compatible with all available Decora® wall plates*• Mounts in a standard depth wall box. All switches can be installed in a multi-gang application. The multi-gang wall plate is sold separately.• Use with GreenMAX Relay Systems• Available in White, Ivory, Light Almond and Gray. Color change kit available for Black and Red buttons (key switch stainless only).• Draws its power from the LumaCAN• Keyswitch includes a set of 2 keys, stainless steel wall plate, tamper resistant screws and installation tool*• Keyswitch is spring return to the center position. Quarter turn of the key functionsas a momentary switch input. Key can be removed in the center position only.*Excluding keyswitchGreenMAX Key SwitchGreenMAX Digital SwitchesPRODUCT DATASPECIFICATIONSElectrical• Input Power: 24VDC (LumaCAN integral)• Consumption: 1 Unit Load = 25mA (max)• Connectors: RJ45• Class 2• Cables: Cat6Environmental• Ambient Temperature Range: 32 - 122°F (0 - 50°C)• Relative Humidity: <90% non-condensingListings• Complies with energy code requirements for ASHRAE Standard 90.1 2010 and Title 24 2013 Warranty• Limited 2-Year WarrantyDIMENSIONS1,2,4,8 Button SwitchesKeyswitch A 1.65” (42.06mm) 1.70” (43.18mm)B4.60” (117.07mm) 4.50” (114.30mm)C 2.75” (69.85mm) 2.75” (69.85mm)D 0.37” (9.55mm)0.28” (7.21mm)E1.16” (29.51mm) 1.88” (47.88mm)F2.68” (68.25mm)2.70” (68.58mm)WIRING DIAGRAM * Replace x to indicate color: (W) = White, (I) = Ivory, (T) = Light Almond, (G) = GrayReplace y to indicate color: (W) = White, (I) = Ivory, (T) = Light Almond, (G) = Gray (R) = Red, (E) = Black ** Stainless steel wallplate cannot be engraved. Multi-gang keyswitch order requires a custom wallplateG-8320F/L19-AJAREV DEC 2019Leviton Manufacturing Co., Inc. Lighting & Controls20497 SW Teton Avenue, Tualatin, OR 97062 tel 800-736-6682 fax 503-404-5594 tech line (6:00AM-4:00PM PT Mon-Fri) 800-959-6004Leviton Manufacturing Co., Inc. Global Headquarters201 North Service Road, Melville, NY 11747-3138 tel 800-323-8920 fax 800-832-9538 tech line (8:30AM-7:00PM ET Mon-Fri) 800-824-3005Visit our Website at: /greenmax©2020 Leviton Manufacturing Co., Inc. All rights reserved. Subject to change without notice.。

MAX809SN160T1资料

MAX809 Series,MAX810 SeriesVery Low Supply Current 3-Pin Microprocessor Reset MonitorsThe MAX809 and MAX810 are cost–effective system supervisor circuits designed to monitor V CC in digital systems and provide a reset signal to the host processor when necessary. No external components are required.The reset output is driven active within 10 µsec of V CC falling through the reset voltage threshold. Reset is maintained active for a minimum of 140 msec after V CC rises above the reset threshold. The MAX810 has an active–high RESET output while the MAX809 has an active–low RESET output. The output of the MAX809 is guaranteed valid down to V CC = 1.0 V. Both devices are available in a SOT–23 package.The MAX809/810 are optimized to reject fast transient glitches on the V CC line. Low supply current of 1.0 µA (V CC= 3.2 V) makes these devices suitable for battery powered applications.Features•Precision V CC Monitor for 2.5 V, 3.0 V, 3.3 V, and 5.0 V Supplies •Precision Monitoring V oltages from 1.6 V to 4.9 V Availablein 100 mV Steps•140 msec Guaranteed Minimum RESET Output Duration •RESET Output Guaranteed to V CC = 1.0 V•Low Supply Current•V CC Transient Immunity•Small SOT–23 Package•No External Components•Wide Operating Temperature: –40°C to 105°CTypical Applications•Computers•Embedded Systems•Battery Powered Equipment•Critical µP Power Supply MonitoringV CCFigure 1. Typical Application DiagramDevice Package ShippingORDERING INFORMATIONMAX809xTR SOT–233000 Tape/Reel MAX809SNxxxT1SOT–233000 Tape/Reel NOTE:*SOT–23 is equivalent to JEDEC (TO–236) **RESET is for MAX809***RESET is for MAX810SOT–23(TO–236)CASE 318PIN CONFIGURATION312V CCGNDRESET**SOT–23*(Top View)xx, xxx= Specific Device Codem= Date Codey= Yearw= Work WeekMARKINGDIAGRAMS32xxxm1(RESET)***MAX810xTR SOT–233000 Tape/ReelSee general marking information in the device marking section on page 8 of this data sheet.DEVICE MARKING INFORMATION NOTE: The “x” and “xxx” denotes a suffix for V cc voltage threshold options – see page 8 for more details.32xxyw1See specific device markinginformation on page 8.PIN DESCRIPTIONABSOLUTE MAXIMUM RATINGS* (Note 1)1.This device series contains ESD protection and exceeds the following tests:Human Body Model 2000 V per MIL–STD–883, Method 3015. Machine Model Method 350 V.2.The maximum package power dissipation limit must not be exceeded.P D +T J(max)*T Aq JAwith T J(max) = 150°C ELECTRICAL CHARACTERISTICS T A = –40°C to +105°C unless otherwise noted. Typical values are at T A = +25°C. (Note 3)The following data is given for MAX809 threshold levels: 1.60 V, 2.32 V, 2.93 V, 4.63 V and 4.90 V.AELECTRICAL CHARACTERISTICS(continued) T A = –40°C to +105°C unless otherwise noted. Typical values are at T A = +25°C. (Note 4) The following data is given for MAX809 threshold levels: 1.60 V, 2.32 V, 2.93 V, 4.63 V and 4.90 V.A5.Contact your ON Semiconductor sales representative for other threshold voltage options.ELECTRICAL CHARACTERISTICS (V CC = Full Range, T A = –40°C to +85°C unless otherwise noted. Typical values are at T A = +25°C, V CC = 5.0 V for L/M/J, 3.3 V for T/S, 3.0 V for R) (Note 6) The following data is given for MAX809 threshold levels: 2.63 V, 3.08 V, 4.00 V and 4.38 V; MAX810 threshold levels: 2.63 V, 2.93 V, 3.08 V, 4.38 V and 4.63 V.AAPPLICATIONS INFORMATIONV CC Transient RejectionThe MAX809 provides accurate V CC monitoring and reset timing during power–up, power–down, and brownout/sag conditions, and rejects negative–going transients (glitches)on the power supply line. Figure 2 shows the maximum transient duration vs. maximum negative excursion (overdrive) for glitch rejection. Any combination of duration and overdrive which lies under the curve will not generate a reset signal. Combinations above the curve are detected as a brownout or power–down. Typically, transient that goes 100 mV below the reset threshold and lasts 5 µs or less will not cause a reset pulse. Transient immunity can be improved by adding a capacitor in close proximity to the V CC pin of the MAX809.Figure 2. Maximum Transient Duration vs. Overdrivefor Glitch Rejection at 25°CV CC10.010080110.060.0M A X I M U M T R A N S I E N T D U R A T I O N (µs e c )20120RESET COMPARATOR OVERDRIVE (mV)160.06040RESET Signal Integrity During Power–DownThe MAX809 RESET output is valid to V CC = 1.0 V .Below this voltage the output becomes an “open circuit” and does not sink current. This means CMOS logic inputs to the µP will be floating at an undetermined voltage. Most digital systems are completely shutdown well above this voltage.However, in situations where RESET must be maintainedvalid to V CC = 0 V , a pull–down resistor must be connected from RESET to ground to discharge stray capacitances and hold the output low (Figure 3). This resistor value, though not critical, should be chosen such that it does not appreciably load RESET under normal operation (100 k W will be suitable for most applications).Figure 3. Ensuring RESET Valid to V CC = 0 VProcessors With Bidirectional I/O PinsSome µP’s (such as Motorola 68HC11) have bi–directional reset pins. Depending on the current drive capability of the processor pin, an indeterminate logic level may result if there is a logic conflict. This can be avoided by adding a 4.7 k W resistor in series with the output of the MAX809 (Figure 4). If there are other components in the system which require a reset signal, they should be buffered so as not to load the reset line. If the other components are required to follow the reset I/O of the µP, the buffer should be connected as shown with the solid line.Figure 4. Interfacing to Bidirectional Reset I/OBUFFERED RESETThe following data is given for MAX809 threshold levels: 1.60 V, 2.32 V, 2.93 V, 4.63 V and 4.90 V.1.10S U P P L Y C U R R E N T I N M I C R O A M PTEMPERATURE (°C)N O R M A L I Z E D P O W E R –U P R E S E T T I M E O U T–404020–206080Figure 7. Normalized Power–Up Reset vs.Temperature Figure 8. Normalized Reset Threshold Voltagevs. TemperatureTEMPERATURE (°C)–404020–206080The following data is given for MAX809 threshold levels: 2.63 V, 3.08 V, 4.00 V and 4.38 V;MAX810 threshold levels: 2.63 V, 2.93 V, 3.08 V, 4.38 V and 4.63 V.S U P P L Y C U R R E N T ( A )m 040206080100P O W E R -D O W N R E S E T D E L A Y ( s e c )m TEMPERATURE (C °)-40-200204085Figure 13. Power–Up Reset Timeout vs.Temperature TEMPERATURE (C °)-40-20020406085225235230240245250P O W E R -U P R E S E T T I M E O U T (m s e c )60Figure 14. Normalized Reset Threshold vs.TemperatureTAPING FORMComponent Taping Orientation for 3L SOT–23 (JEDEC–236) Devices(Mark Right Side Up)SOT–23Package Carrier Width (W)Pitch (P)Part Per Full ReelReel Size 8 mm4 mm30007 inchesTape & Reel Specifications TableMARKING AND THRESHOLD INFORMATIONm = Date Codey = Yearw = Work WeekPACKAGE DIMENSIONSSOT–23PLASTIC PACKAGE (TO–236)CASE 318–08ISSUE AHNOTES:1.DIMENSIONING AND TOLERANCING PER ANSI Y14.5M, 1982.2.CONTROLLING DIMENSION: INCH.3.MAXIMUM LEAD THICKNESS INCLUDES LEADNotesNotes11ON Semiconductor and are trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC reserves the right to make changes without further notice to any products herein. SCILLC makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does SCILLC assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequential or incidental damages. “Typical” parameters which may be provided in SCILLC data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including “Typicals” must be validated for each customer application by customer’s technical experts. SCILLC does not convey any license under its patent rights nor the rights of others.SCILLC products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications intended to support or sustain life, or for any other application in which the failure of the SCILLC product could create a situation where personal injury or death may occur. Should Buyer purchase or use SCILLC products for any such unintended or unauthorized application, Buyer shall indemnify and hold SCILLC and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that SCILLC was negligent regarding the design or manufacture of the part. SCILLC is an Equal Opportunity/Affirmative Action Employer. PUBLICATION ORDERING INFORMATIONJAPAN: ON Semiconductor, Japan Customer Focus Center4–32–1 Nishi–Gotanda, Shinagawa–ku, Tokyo, Japan 141–0031Phone: 81–3–5740–2700Email: r14525@。

MAX479中文资料

元器件交易网
19-0127; Rev. 1; 11/98
17µA Max, Dual/Quad, Single-Supply, Precision Op Amps
_______________General Description
The MAX478 and MAX479 are dual and quad micropower, precision op amps available in 8-pin and 14-pin DIP and small-outline packages, respectively. Both devices feature an extremely low, 17µA max supply current per op amp, 70µV max offset voltage, 2.2µV/°C max offset voltage drift (0.5µV/°C typ), and 250pA max input offset current. The MAX478 and MAX479 operate from a single supply. The input voltage range includes ground, and the output swings to within a few millivolts of ground, which eliminates pull-down resistors and saves power. Both devices are optimized for single 3V and 5V supply operation, with guaranteed specifications at each supply voltage. Specifications for ±15V operation are also provided.

MAX6342SUT-T中文资料

MAX6342–MAX6345
6-Pin µP Reset Circuit with Power-Fail Comparator
ABSOLUTE MAXIMUM RATINGS
VCC to GND ..............................................................-0.3V to +6V RESET, RESET
元器件交易网
19-1568; Rev 2; 12/05
MAX6342–MAX6345
6-Pin µP Reset Circuit with Power-Fail Comparator
General Description
The MAX6342–MAX6345 family of microprocessor (µP) supervisory circuits monitors power supplies in digital systems. These devices significantly improve system reliability and accuracy compared to separate ICs or discrete components.
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim’s website at .
元器件交易网
Selector Guide 1
SUFFIX
L
M T S R Z
RESET THRESHOLD (V) 4.63 4.38 3.08 2.93 2.63 2.33

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。

SWDC-Max技术参数手册说明书

塞斯纳 208B
435
63% 85% 92% 96%
国王
500
57% 83% 91% 95%
PC-12
系统参数
体积 ( 长 * 宽 * 高）
SWDC-Max6C：663*560*635mm SWDC-Max6A：490*480*800mm
工作温度
0 ～ 40℃
工作电压
28V
工作电流
15A
最大功率
442W
如何选择快门速度
物方像移量（CM）
快门速度（s）
1/2500 1/2000 1/1600 1/1250 1/1000 1/800
R44
150km/h 2
2
3
3
4
5
贝尔 206
运 -5
小松鼠 B3 180km/h 2
3
3
4
5
6
贝尔 407
PC-6
230km/h 3
3
4
5
6
8
P-750

240km/h 3
SWDC-Max 技术参数手册
SWDC-Max C 型
SWDC-Max A 型
Max7
Max6
Max3
基础参数
镜头数
6个
幅面大小像元大小焦距组合
SWDC-Max3：三拼幅面 34000*14000 像元 SWDC-Max6：下视幅面 20000*13000 像元
倾斜幅面 14204*10652 像元
如何选择焦距
GSD(cm) 2 5 10 15
航高（单位：m）
70mm
90mm
372
479
931
1197

MAX6398ATT-T中文资料

General DescriptionThe MAX6397/MAX6398 are small, high-voltage overvolt-age protection circuits. These devices disconnect the output load or limit the output voltage during an input overvoltage condition. These devices are ideal for appli-cations that must survive high-voltage transients such as those found in automotive and industrial applications.The MAX6397/MAX6398 monitor the input or output voltages and control an external n-channel MOSFET to isolate or limit the load from overvoltage transient energy.When the monitored input voltage is below the user-adjustable overvoltage threshold, the external n-channel MOSFET is turned on by the GATE output. In this mode,the internal charge pump fully enhances the n-channel MOSFET with a 10V gate-to-source voltage.When the input voltage exceeds the overvoltage thresh-old, the protection can disconnect the load from the input by quickly forcing the GATE output low. In some applications, disconnecting the output from the load is not desirable. In these cases, the protection circuit can be configured to act as a voltage limiter where the GATE output sawtooths to limit the voltage to the load.The MAX6397 also offers an always-on linear regulator that is capable of delivering up to 100mA of output current. This high-voltage linear regulator consumes only 37µA of quiescent current.The regulator is offered with output options of 5V, 3.3V,2.5V, or 1.8V. An open-drain, power-good output (POK)asserts when the regulator output falls below 92.5% or 87.5% of its nominal voltage.The MAX6397/MAX6398 include internal thermal-shut-down protection, disabling the external MOSF ET and linear regulator if the chip reaches overtemperature conditions. The devices operate over a wide 5.5V to 72V supply voltage range, are available in small TDFN packages, and are fully specified from -40°C to +125°C.ApplicationsAutomotive Industrial FireWire ®Notebook Computers Wall Cube Power DevicesFeatures♦5.5V to 72V Wide Supply Voltage Range♦Overvoltage Protection Controllers Allow User to Size External n-Channel MOSFETs ♦Internal Charge-Pump Circuit Ensures MOSFET Gate-to-Source Enhancement for Low R DS(ON)Performance ♦Disconnect or Limit Output from Input During Overvoltage Conditions ♦Adjustable Overvoltage Threshold ♦Thermal-Shutdown Protection♦Always-On, Low-Current (37µA) Linear Regulator Sources Up to 100mA (MAX6397)♦Fully Specified from -40°C to +125°C (T J )♦Small, Thermally Enhanced 3mm x 3mm TDFN PackageMAX6397/MAX6398Overvoltage Protection Switch/LimiterControllers Operate Up to 72V________________________________________________________________Maxim Integrated Products1Pin ConfigurationsOrdering Information19-3668; 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 .Selector Guide and Typical Operating Circuit appear at end of data sheet.FireWire is a registered trademark of Apple Computer, Inc.M A X 6397/M A X 6398Overvoltage Protection Switch/Limiter Controllers Operate Up to 72V 2_______________________________________________________________________________________ABSOLUTE MAXIMUM RATINGSELECTRICAL CHARACTERISTICS(V= 14V; C = 6000pF, C = 4.7µF, T = T = -40°C to +125°C, unless otherwise noted. Typical values are at T = T = +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 oper-ation 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 pins referenced to GND, unless otherwise noted.)IN, GATE, OUT............................................................-0.3V to +80V SHDN ..................................................................-0.3V to (IN + 0.3V)GATE to OUT.................................................................-0.3 to +20V SET, REG, POK...........................................................-0.3V to +12V Maximum Current:IN, REG...............................................................................350mA All Remaining Pins...................................................................50mAContinuous Power Dissipation (T A = +70°C)6-Pin TDFN (derate 18.2mW/°C above +70°C).............1455mW 8-Pin TDFN (derate 18.2mW/°C above +70°C).............1455mW Operating Temperature Range (T A )......................-40°C to +125°C Junction Temperature...........................................................+150°C Storage Temperature Range.................................-65°C to +150°C Lead Temperature................................................................+300°CMAX6397/MAX6398Overvoltage Protection Switch/LimiterControllers Operate Up to 72V_______________________________________________________________________________________3ELECTRICAL CHARACTERISTICS (continued)(V IN = 14V; C GATE = 6000pF, C REG = 4.7µF, T A = T J = -40°C to +125°C, unless otherwise noted. Typical values are at T A = T J = +25°C.)(Note 1)Note 1:Specifications to -40°C are guaranteed by design and not production tested.Note 2:The MAX6397/MAX6398 power up with the external FET in off mode (V GATE = GND). The external FET turns on t START after thedevice is powered up and all input conditions are valid.Note 3:For accurate overtemperature shutdown performance, place the device in close thermal contact with the external MOSFET.Note 4:Dropout voltage is defined as V IN - V REG when V REG is 2% below the value of V REG for V IN = V REG (nominal) + 2V.Note 5:Operations beyond the thermal dissipation limit may permanently damage the device.M A X 6397/M A X 6398Overvoltage Protection Switch/Limiter Controllers Operate Up to 72V 4_______________________________________________________________________________________Typical Operating Characteristics(V IN = 14V, C REG = 4.7µF, I REG = 0, unless otherwise noted.)40608010012014016002010304050607080SUPPLY CURRENT vs. INPUT VOLTAGEINPUT VOLTAGE (V)S U P P L Y C U R R E N T (µA )SUPPLY CURRENT vs. TEMPERATURETEMPERATURE (°C)S U P P L Y C U R R E N T (µA )1007525500-259010011012013014015016017018080-50125405060708090100110120020406080SUPPLY CURRENT vs. INPUT VOLTAGEINPUT VOLTAGE (V)S U P P L Y CU R R E N T (µA )8010090120110130140-502550-25075100125SUPPLY CURRENT vs. TEMPERATURETEMPERATURE (°C)S U P P L YC U R R E N T (µA )20302540354550040206080SHUTDOWN SUPPLY CURRENT vs. INPUT VOLTAGE (MAX6397)INPUT VOLTAGE (V)S U P P L YC U R R E N T (µA )103050700642810121416182020406080SHUTDOWN SUPPLY CURRENTvs. INPUT VOLTAGEINPUT VOLTAGE (V)S U P PL Y C U R R E N T (µA )0642810124121068141618202224GATE-DRIVE VOLTAGE vs. INPUT VOLTAGEINPUT VOLTAGE (V)V G A T E - V O U T (V )4.04.64.44.25.04.85.85.65.45.26.0-50-250255075100125UVLO THRESHOLD vs. TEMPERATUREM A X 6397-98 t o c 08TEMPERATURE (°C)V U V L O (V )SET THRESHOLD vs. TEMPERATUREM A X 6397-98 t o c 09TEMPERATURE (°C)S E T T H R E S H O L D (V )1007525500-251.2041.2081.2121.2161.2201.2241.2281.2321.2361.2401.200-50125MAX6397/MAX6398Overvoltage Protection Switch/LimiterControllers Operate Up to 72V_______________________________________________________________________________________516.016.316.216.116.516.416.916.816.716.617.0-50-25255075100125GATE-TO-OUT CLAMP VOLTAGEvs. TEMPERATUREM A X 6397-98 t o c 10TEMPERATURE (°C)G A T E -T O -O U T C L A M P V O L T A G E (V )00.40.20.80.61.21.01.41.81.62.0040608020100120140160180DROPOUT VOLTAGE vs. REG LOAD CURRENTREG LOAD CURRENT (mA)D R O P O U T V O L T A GE (V )4.905.004.955.105.055.155.20-40-10520-253550658095110125REG OUTPUT VOLTAGEvs. LOAD CURRENT AND TEMPERATURETEMPERATURE (°C)R E G O U T P U T V O L T A G E (V )4.04.64.44.24.85.05.21601204080200240280320360400MAXIMUM REG OUTPUT VOLTAGE vs. LOAD CURRENT AND TEMPERATURELOAD CURRENT (mA)R E G O U T P U T V O L T A G E (V )POWER-SUPPLY REJECTION RATIOvs. FREQUENCYFREQUENCY (Hz)P S R R (d B )1M 100k 10k 1k 100-60-50-40-30-20-100-701010M4ms/divSTARTUP WAVEFORM(R LOAD = 100Ω, C IN = 10µF, C OUT = 10µF)V IN 10V/divMAX6397-98 toc16V GATE 10V/div V OUT 10V/div I OUT200mA/div400µs/divSTARTUP WAVEFORM FROM SHUTDOWN(C IN = 10µF, C OUT = 10µF)V 2V/divV GATE 10V/divV OUT 10V/div I OUT200mA/divR LOAD = 100ΩTypical Operating Characteristics (continued)(V IN = 14V, C REG = 4.7µF, I REG = 0, unless otherwise noted.)GATE-DRIVE VOLTAGE vs. TEMPERATUREM A X 6397-98 t o c 14TEMPERATURE (°C)G A T E -D R I V E V O L T A G E (V )1007525500-2510.45510.46010.46510.47010.47510.48010.48510.49010.49510.50010.450-50125M A X 6397/M A X 6398Overvoltage Protection Switch/Limiter Controllers Operate Up to 72V 6_______________________________________________________________________________________Typical Operating Characteristics (continued)(V IN = 14V, C REG = 4.7µF, I REG = 0, unless otherwise noted.)200µs/divOVERVOLTAGE SWITCH FAULTV IN 20V/divV GATE 20V/div V OUT 20V/div V REG 5V/divV OV = 30V1ms/divVOLTAGE LIMIT FAULTV IN 20V/divV GATE 20V/divV OUT 20V/div V REG 5V/divV OV = 30V400µs/divTRANSIENT RESPONSEV IN 10V/divV REG100mV/divC REG = 10µF I REG = 10mA1ms/divREG LOAD-TRANSIENT RESPONSEV REGAC-COUPLED 500mV/divI REG100mA/divC REG = 10µF1ms/divREGULATOR STARTUP WAVEFORMV IN 10V/divV POK 2V/divV REG 2V/divI REG = 10mA100µs/divREGULATOR POK ASSERTIONV REG 2V/divI REG200mA/div V POK 2V/divI REG = 00V0V0ADetailed Description The MAX6397/MAX6398 are ultra-small, low-current, high-voltage protection circuits for automotive applica-tions that must survive load dump and high-voltage transient conditions. These devices monitor the input/ output voltages and control an external n-channel MOSF ET to isolate the load or to regulate the output voltage from overvoltage transient energy. The con-troller allows system designers to size the external MOSFET to their load current and board size.The MAX6397/MAX6398 drive the MOSF ET’s gate high when the monitored input voltage is below the adjustable overvoltage threshold. An internal charge-pump circuit provides a 5V to 10V gate-to-source drive (see the Typical Operating Characteristics) to ensure low input-to-load voltage drops in normal operating modes. When the input voltage rises above the user-adjusted overvoltage threshold, GATE pulls to OUT, turning off the MOSFET.The MAX6397/MAX6398 are configurable to operate as overvoltage protection switches or as closed-looped volt-age limiters. In overvoltage protection switch mode, theinput voltage is monitored. When an overvoltage condi-tion occurs at IN, GATE pulls low, disconnecting the loadfrom the power source, and then slowly enhances upon removal of the overvoltage condition. In overvoltagelimit mode, the output voltage is monitored and theMAX6397/MAX6398 regulate the source of the external MOSFET at the adjusted overvoltage threshold, allowing devices within the system to continue operating during an overvoltage condition.The MAX6397/MAX6398 undervoltage lockout (UVLO) function disables the devices as long as the input remains below the 5V (typ) UVLO turn-on threshold. TheMAX6397/MAX6398 have an active-low SHDN input toturn off the external MOSFET, disconnecting the load and reducing power consumption. After power is applied and SHDN is driven above its logic-high voltage, there is a100µs delay before GATE enhancement commences.MAX6397/MAX6398Overvoltage Protection Switch/LimiterControllers Operate Up to 72V _______________________________________________________________________________________7M A X 6397/M A X 6398The MAX6397 integrates a high-input-voltage, low-qui-escent-current linear regulator in addition to an over-voltage protector circuit. The linear regulator remains enabled at all times to power low-current “always-on”applications (independent of the state of the external MOSF ET). The regulator is offered with several stan-dard output voltage options (5V, 3.3V, 2.5V, or 1.8V).An open-drain power-good output notifies the system if the regulator output falls to 92.5% or 87.5% of its nomi-nal voltage. The MAX6397’s REG output operates inde-pendently of the SHDN logic input.The MAX6397/MAX6398 include internal thermal-shut-down protection, disabling the external MOSF ET and linear regulator if the chip reaches overtemperature conditions.Linear Regulator (MAX6397 Only)The MAX6397 is available with 5.0V, 3.3V, 2.5V, and 1.8V factory-set output voltages. Each regulator sources up to 100mA and includes a current limit of 230mA. The linear regulator operates in an always-on condition regardless of the SHDN logic. For fully specified operation, V IN must be greater than 6.5V for the MAX6397L/M (5V regulator output). The actual output current may be limited by the operating condition and package power dissipation.Power-OK OutputPOK is an open-drain output that goes low when REG falls to 92.5% or 87.5% (see the Selector Guide ) of its nominal output voltage. To obtain a logic-level output,connect a pullup resistor from POK to REG or another system voltage. Use a resistor in the 100k Ωrange to minimize current consumption. POK provides a valid logic-output level down to V IN = 1.5V.GATE VoltageThe MAX6397/MAX6398 use a high-efficiency charge pump to generate the GATE voltage. Upon V IN exceed-ing the 5V (typ) UVLO threshold, GATE enhances 10V above IN (for V IN ≥14V) with a 75µA pullup current. An overvoltage condition occurs when the voltage at SET pulls above its 1.215V threshold. When the threshold is crossed, GATE falls to OUT within 100ns with a 100mA (typ) pulldown current. The MAX6397/MAX6398 include an internal clamp to OUT that ensures GATE is limited to 18V (max) above OUT to prevent gate-to-source damage to the external FET.The GATE cycle during overvoltage limit and overvolt-age switch modes are quite similar but have distinct characteristics. In overvoltage switch mode (Figure 2a),GATE is enhanced to V IN + 10V while the monitored IN voltage remains below the overvoltage fault threshold (SET < 1.215V). When an overvoltage fault occurs (SET ≥1.215V), GATE is pulled one diode below OUT, turn-ing off the external F ET and disconnecting the load from the input. GATE remains low (FET off) as long as V IN is above the overvoltage fault threshold. As V IN falls back below the overvoltage fault threshold (-5% hys-teresis) GATE is again enhanced to V IN + 10V.In overvoltage limit mode (Figure 2b), GATE is enhanced to V IN + 10V. While the monitored OUT voltage remains below the overvoltage fault threshold (SET < 1.215V).When an overvoltage fault occurs (SET ≥1.215V),GATE is pulled low one diode drop below OUT until OUT drops 5% below the overvoltage fault threshold.GATE is then turned back on until OUT again reaches the overvoltage fault threshold and GATE is again turned off.Overvoltage Protection Switch/Limiter Controllers Operate Up to 72V 8_______________________________________________________________________________________GATE cycles on-off-on-off-on in a sawtooth waveform until OUT remains below the overvoltage fault threshold and GATE remains constantly on (V IN + 10V). The over-voltage limiter’s sawtooth GATE output operates the MOSFET in a switched-linear mode while the input volt-age remains above the overvoltage fault threshold. The sawtooth frequency depends on the load capacitance,load current, and MOSFET turn-on time (GATE charge current and GATE capacitance).GATE goes high when the following startup conditions are met: V IN is above the UVLO threshold, SHDN is high, an overvoltage fault is not present and the device is not in thermal shutdown.Overvoltage MonitoringWhen operating in overvoltage mode, the MAX6397/MAX6398 feedback path (F igure 3) consists of IN,SET’s internal comparator, the internal gate charge pump, and the external n-channel MOSFET resulting in a switch-on/off function. When the programmed over-voltage threshold is tripped, the internal fast compara-tor turns off the external MOSFET, pulling GATE to OUT within t OV and disconnecting the power source from the load. When IN decreases below the adjusted over-voltage threshold, the MAX6397/MAX6398 slowly enhance GATE above OUT, reconnecting the load to the power source.Overvoltage LimiterWhen operating in overvoltage limiter mode, the MAX6397/MAX6398 feedback path (F igure 4) consists of OUT, SET’s internal comparator, the internal gate charge pump and the external n-channel MOSF ET,which results in the external MOSF ET operating as a voltage regulator.During normal operation, GATE is enhanced 10V above OUT. The external MOSFET source voltage is monitored through a resistor-divider between OUT and SET. When OUT rises above the adjusted overvoltage threshold, an internal comparator sinks the charge-pump current, dis-charging the external GATE, regulating OUT at the set overvoltage threshold. OUT remains active during the overvoltage transients and the MOSFET continues to con-duct during the overvoltage event, operating in switched-linear mode.MAX6397/MAX6398Overvoltage Protection Switch/LimiterControllers Operate Up to 72V_______________________________________________________________________________________9V GATE 10V/divV OUT 10V/divV IN 10V/div10ms/divV GATE 10V/divV OUT 10V/divV IN 10V/div4ms/divM A X 6397/M A X 6398As the transient begins decreasing, OUT fall time will depend on the MOSF ET’s GATE charge, the internal charge-pump current, the output load, and the tank capacitor at OUT.For fast-rising transients and very large-sized MOSFETs,add an additional external bypass capacitor from GATE to GND to reduce the effect of the fast-rising voltages at IN. The external capacitor acts as a voltage-divider working against the MOSF ETs’ drain-to-gate capaci-tance. For a 6000pF C gd , a 0.1µF capacitor at GATE will reduce the impact of the fast-rising V IN input.Caution must be exercised when operating the MAX6397/MAX6398 in voltage-limiting mode for long durations. If the V IN is a DC voltage greater than the MOSFET’s maximum gate voltage, the FET will dissipate power continuously. To prevent damage to the external MOSFET, proper heatsinking should be implemented.Applications InformationLoad DumpMost automotive applications run off a multicell, 12V lead-acid battery with a nominal voltage that swings between 9V and 16V (depending on load current,charging status, temperature, battery age, etc.). The battery voltage is distributed throughout the automobile and is locally regulated down to voltages required by the different system modules. Load dump occurs when the alternator is charging the battery and the battery becomes disconnected. Power in the alternator (essen-tially an inductor) flows into the distributed power sys-tem and elevates the voltage seen at each module. The voltage spikes have rise times typically greater than 5ms and decays within several hundred milliseconds but can extend out to 1s or more depending on thecharacteristics of the charging system (F igure 5).These transients are capable of destroying semicon-ductors on the first ‘fault event.’Setting Overvoltage ThresholdsSET provides an accurate means to set the overvoltage level for the MAX6397/MAX6398. Use a resistor-divider to set the desired overvoltage condition (Figure 6). SET has a rising 1.215V threshold with a 5% falling hysteresis.Begin by selecting the total end-to-end resistance,R TOTAL = R1 + R2. Choose R TOTAL to yield a total cur-rent equivalent to a minimum 100 x I SET (SET’s input bias current) at the desired overvoltage threshold.For example:With an overvoltage threshold set to 20V:R TOTAL < 20V/(100 x I SET )where I SET is SET’s 50nA input bias current.R TOTAL < 4M ΩUse the following formula to calculate R2:where V TH is the 1.215V SET rising threshold and V OV is the overvoltage threshold.R2 = 243k Ω, use a 240k Ωstandard resistor.R TOTAL = R2 + R1, where R1 = 3.76M Ω.Use a 3.79M Ωstandard resistor.A lower value for total resistance dissipates morepower but provides slightly better accuracy.Overvoltage Protection Switch/Limiter Controllers Operate Up to 72V 10______________________________________________________________________________________Reverse-Battery ProtectionUse a diode or p-channel MOSF ET to protect the MAX6397/MAX6398 during a reverse-battery insertion (Figures 7a, 7b). Low p-channel MOSFET on-resistance of 30m Ωor less yields a forward-voltage drop of only a few millivolts (versus hundreds of millivolts for a diode,Figure 7a) thus improving efficiency.Connecting a positive battery voltage to the drain of Q1(F igure 7b) produces forward bias in its body diode,which clamps the source voltage one diode drop below the drain voltage. When the source voltage exceeds Q1’s threshold voltage, Q1 turns on. Once the F ET is on, the battery is fully connected to the system and can deliver power to the device and the load.An incorrectly inserted battery reverse-biases the F ET’s body diode. The gate remains at the ground potential.The FET remains off and disconnects the reversed bat-tery from the system. The zener diode and resistor com-bination prevent damage to the p-channel MOSF ET during an overvoltage condition.MAX6397/MAX6398Overvoltage Protection Switch/LimiterControllers Operate Up to 72V______________________________________________________________________________________11M A X 6397/M A X 6398REG Capacitor Selection for StabilityFor stable operation over the full temperature range and with load currents up to 100mA, use ceramic capacitor values greater than 4.7µF. Large output capacitors help reduce noise, improve load-transient response, and power-supply rejection at REG. Note that some ceramic dielectrics exhibit large capacitance and ESR variation with temperature. At lower temperatures, it may be nec-essary to increase capacitance.Under normal conditions, use a 10µF capacitor at rger input capacitor values and lower ESR provide bet-ter supply-noise rejection and line-transient response.Inrush/Slew-Rate ControlInrush current control can be implemented by placing a capacitor at GATE (F igure 8) to slowly ramp up the GATE, thus limiting the inrush current and controlling GATE’s slew rate during initial turn-on. The inrush cur-rent can be approximated using the following formula:where I GATE is GATE’s 75µA sourcing current, I LOAD is the load current at startup, and C OUT is the output capacitor.Input Transients ClampingWhen the external MOSFET is turned off during an over-voltage occurrence, stray inductance in the power path may cause voltage ringing exceeding the MAX6397/MAX6398 absolute maximum input (IN) supply rating.The following techniques are recommended to reduce the effect of transients:•Minimize stray inductance in the power path usingwide traces, and minimize loop area including the power traces and the return ground path.•Add a zener diode or transient voltage suppressor(TVS) rated below the IN absolute maximum rating (Figure 9).Add a resistor in series with IN to limit transient currentgoing into the input for the MAX6398 only.Overvoltage Protection Switch/Limiter Controllers Operate Up to 72V 12______________________________________________________________________________________Figure 8. MAX6397/MAX6398 Controlling GATE Inrush CurrentFigure 9. Protecting the MAX6397/MAX6398 Input from High-Voltage TransientsMOSFET SelectionSelect external MOSF ETs according to the application current level. The MOSF ET’s on-resistance (R DS(ON))should be chosen low enough to have minimum voltage drop at full load to limit the MOSFET power dissipation.Determine the device power rating to accommodate an overvoltage fault when operating the MAX6397/MAX6398 in overvoltage limit mode.During normal operation, the external MOSFETs dissipate little power. The power dissipated in normal operation is:P Q1 = I LOAD 2x R DS(ON).The most power dissipation will occur during a pro-longed overvoltage event when operating the MAX6397/MAX6398 in voltage limiter mode, resulting in high power dissipated in Q1 (F igure 10) where the power dissipated across Q1 is:P Q1= V Q1x I LOADwhere V Q1is the voltage across the MOSF ET’s drain and source.Thermal ShutdownThe MAX6397/MAX6398 thermal-shutdown feature shuts off the linear regulator output, REG, and GATE if it exceeds the maximum allowable thermal dissipation.Thermal shutdown also monitors the PC board tempera-ture of the external nF ET when the devices sit on thesame thermal island. Good thermal contact between the MAX6397/MAX6398 and the external nF ET is essential for the thermal-shutdown feature to operate effectively.Place the nFET as close as possible to OUT.When the junction temperature exceeds T J = +150°C,the thermal sensor signals the shutdown logic, turning off REG’s internal pass transistor and the GATE output,allowing the device to cool. The thermal sensor turns the pass transistor and GATE on again after the IC’s junction temperature cools by 20°C. Thermal-overload protection is designed to protect the MAX6397/MAX6398 and the external MOSFET in the event of cur-rent-limit fault conditions. For continuous operation, do not exceed the absolute maximum junction-tempera-ture rating of T J = +150°C.Thermal ShutdownOvervoltage Limiter ModeWhen operating the MAX6397/MAX6398 in overvoltage limit mode for a prolonged period of time, a thermal shutdown is possible due to device self-heating. The thermal shutdown is dependent on a number of differ-ent factors:•The device’s ambient temperature (T A )•The output capacitor (C OUT )•The output load current (I OUT )•The overvoltage threshold limit (V OV )•The overvoltage waveform period (t OVP )•The power dissipated across the package (P DISS )MAX6397/MAX6398Overvoltage Protection Switch/LimiterControllers Operate Up to 72V______________________________________________________________________________________13M A X 6397/M A X 6398When OUT exceeds the adjusted overvoltage threshold,an internal GATE pulldown current is enabled until OUT drops by 5%. The capacitance at OUT is discharged by the internal current sink and the external OUT load cur-rent. The discharge time (∆t1) is approximately:where V OV is the adjusted overvoltage threshold, I OUT is the external load current and I GATEPD is the GATE’s internal 100mA (typ) pulldown current.When OUT falls 5% below the overvoltage threshold point, the internal current sink is disabled and the MAX6397/MAX6398’s internal charge pump begins recharging the external GATE voltage. The OUT volt-age continues to drop due to the external OUT load current until the MOSF ET gate is recharged. The time needed to recharge GATE and re-enhance the external nFET is approximately:where C ISS is the MOSFET’s input capacitance, V GS(TH)is the MOSFET’s gate-to-source threshold voltage, V F is the internal clamp diode forward voltage (V F = 1.5V typ),and I GATE is the MAX6397/MAX6398 charge-pump cur-rent (75µA typ).During ∆t2, C OUT loses charge through the output load.The voltage across C OUT (∆V2) decreases until the MOSF ET reaches its V GS(TH) threshold and can be approximated using the following formula:Once the MOSFET V GS (TH ) is obtained, the slope of the output voltage rise is determined by the MOSF ET Q G charge through the internal charge pump with respect to the drain potential. The time for the OUT voltage to rise again to the overvoltage threshold can be approxi-mated using the following formula:where ∆V OUT = ( V OV x 0.05) + ∆V2.The total period of the overvoltage waveform can be summed up as follows:t OVP = ∆t1 + ∆t2 + ∆t3The MAX6397/MAX6398 dissipate the most power dur-ing an overvoltage event when I OUT = 0 (C OUT is dis-charged only by the internal current sink). The maximum power dissipation can be approximated using the follow-ing equation:The die temperature (T J ) increase is related to θJC (8.3°C/W and 8.5°C/W for the MAX6397 and MAX6398,respectively) of the package when mounted correctly with a strong thermal contact to the circuit board. The MAX6397/MAX6398 thermal shutdown is governed by the equation:T J = T A + P DISS x (θJC + θCA) < 170°C (typical thermal-shutdown temperature)For the MAX6397, the power dissipation of the internal linear regulator must be added to the overvoltage pro-tection circuit power dissipation to calculate the die temperature. The linear regulator power dissipation is calculated using the following equation:P REG = (V IN – V REG ) (I REG )F or example, using an IRF R3410 100V n-channel MOSF ET, F igure 12 illustrates the junction temperature vs. output capacitor with I OUT = 0, T A = +125°C, V OV < 16V,V F = 1.5V, I GATE = 75mA, and I GATEPD =100mA. Figure 12 shows the relationship between output capacitance versus die temperature for the conditionslisted above.Overvoltage Protection Switch/Limiter Controllers Operate Up to 72V 14______________________________________________________________________________________。

MAX1978中文数据手册

用于Peltier模块的集成温度控制器概论MAX1978 / MAX1979是用于Peltier热电冷却器（TEC）模块的最小, 最安全, 最精确完整的单芯片温度控制器。

片上功率FET和热控制环路电路可最大限度地减少外部元件, 同时保持高效率。

可选择的500kHz / 1MHz开关频率和独特的纹波消除方案可优化元件尺寸和效率, 同时降低噪声。

内部MOSFET的开关速度经过优化, 可降低噪声和EMI。

超低漂移斩波放大器可保持±0.001°C的温度稳定性。

直接控制输出电流而不是电压, 以消除电流浪涌。

独立的加热和冷却电流和电压限制提供最高水平的TEC保护。

MAX1978采用单电源供电, 通过在两个同步降压调节器的输出之间偏置TEC, 提供双极性±3A输出。

真正的双极性操作控制温度, 在低负载电流下没有“死区”或其他非线性。

当设定点非常接近自然操作点时, 控制系统不会捕获, 其中仅需要少量的加热或冷却。

模拟控制信号精确设置TEC 电流。

MAX1979提供高达6A的单极性输出。

提供斩波稳定的仪表放大器和高精度积分放大器, 以创建比例积分（PI）或比例积分微分（PID）控制器。

仪表放大器可以连接外部NTC或PTC热敏电阻, 热电偶或半导体温度传感器。

提供模拟输出以监控TEC温度和电流。

此外, 单独的过热和欠温输出表明当TEC温度超出范围时。

片上电压基准为热敏电阻桥提供偏置。

MAX1978 / MAX1979采用薄型48引脚薄型QFN-EP 封装, 工作在-40°C至+ 85°C温度范围。

采用外露金属焊盘的耐热增强型QFN-EP封装可最大限度地降低工作结温。

评估套件可用于加速设计。

应用光纤激光模块典型工作电路出现在数据手册的最后。

WDM, DWDM激光二极管温度控制光纤网络设备EDFA光放大器电信光纤接口ATE特征♦尺寸最小, 最安全, 最精确完整的单芯片控制器♦片上功率MOSFET-无外部FET♦电路占用面积<0.93in2♦回路高度<3mm♦温度稳定性为0.001°C♦集成精密积分器和斩波稳定运算放大器♦精确, 独立的加热和冷却电流限制♦通过直接控制TEC电流消除浪涌♦可调节差分TEC电压限制♦低纹波和低噪声设计♦TEC电流监视器♦温度监控器♦过温和欠温警报♦双极性±3A输出电流（MAX1978）♦单极性+ 6A输出电流（MAX1979）订购信息* EP =裸焊盘。

MAX6359MSUT-T中文资料

__________Voltage Threshold Levels
PART NO. SUFFIX (_ _) LT LS LR MT MS MR TY SY VCC5 NOMINAL VOLTAGE THRESHOLD (V) 4.63 4.63 4.63 4.38 4.38 4.38 3.08 2.93 VCC3 NOMINAL VOLTAGE THRESHOLD (V) 3.08 2.93 2.63 3.08 2.93 2.63 2.19 2.19
Pin Configurations appear at end of data sheet. Selector Guide appears at end of data sheet.
1
________________________________________________________________ Maxim Integrated Products
MAX6351–MAX6360
Applications
Computers Controllers Portable/Battery-Powered Equipment Intelligent Instruments Multivoltage Systems
PART* MAX6351_ _UT-T MAX6352_ _UK-T MAX6353_ _UK-T MAX6354_ _UK-T MAX6355_ _UT-T MAX6356_ _UT-T MAX6357_ _UT-T MAX6358_ _UT-T MAX6359_ _UT-T MAX6360_ _UT-T
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MAX6369KA+T中文资料

General DescriptionThe MAX6369–MAX6374 are pin-selectable watchdog timers that supervise microprocessor (µP) activity and signal when a system is operating improperly. During normal operation, the microprocessor should repeated-ly toggle the watchdog input (WDI) before the selected watchdog timeout period elapses to demonstrate that the system is processing code properly. If the µP does not provide a valid watchdog input transition before the timeout period expires, the supervisor asserts a watch-dog (WDO ) output to signal that the system is not exe-cuting the desired instructions within the expected time frame. The watchdog output pulse can be used to reset the µP or interrupt the system to warn of processing errors.The MAX6369–MAX6374 are flexible watchdog timer supervisors that can increase system reliability through notification of code execution errors. The family offers several pin-selectable watchdog timing options to match a wide range of system timing applications:•Watchdog startup delay: provides an initial delay before the watchdog timer is started.•Watchdog timeout period: normal operating watch-dog timeout period after the initial startup delay.•Watchdog output/timing options: open drain (100ms)or push-pull (1ms).The MAX6369–MAX6374 operate over a +2.5V to +5.5V supply range and are available in miniature 8-pin SOT23 packages.________________________ApplicationsEmbedded Control Systems Industrial ControllersCritical µP and Microcontroller (µC) Monitoring AutomotiveTelecommunications NetworkingFeatures♦Precision Watchdog Timer for Critical µP Applications ♦Pin-Selectable Watchdog Timeout Periods ♦Pin-Selectable Watchdog Startup Delay Periods ♦Ability to Change Watchdog Timing Characteristics Without Power Cycling ♦Open-Drain or Push-Pull Pulsed Active-Low Watchdog Output ♦Watchdog Timer Disable Feature ♦+2.5V to +5.5V Operating Voltage ♦8µA Low Supply Current♦No External Components Required ♦Miniature 8-Pin SOT23 PackageMAX6369–MAX6374Pin-Selectable Watchdog Timers19-1676; Rev 3; 11/05Ordering InformationPin Configuration appears at end of data sheet.Note:All devices are available in tape-and-reel only. Required order increment is 2,500 pieces.Devices are available in both leaded and lead-free packaging.Specify lead-free by replacing “-T” with “+T” when ordering.Selector GuideFor pricing, delivery, and ordering information,please contact Maxim/Dallas Direct!at1-888-629-4642, or visit Maxim’s website at .M A X 6369–M A X 6374Pin-Selectable Watchdog Timers 2_______________________________________________________________________________________ABSOLUTE MAXIMUM RATINGSELECTRICAL CHARACTERISTICS(V CC = +2.5V to +5.5V, SET_ = V CC or GND, T A = -40°C to +85°C, unless otherwise noted. Typical values are at T A = +25°C andStresses 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.Terminal Voltage (with respect to GND)V CC .....................................................................-0.3V to +6V WDI.....................................................................-0.3V to +6V WDO (Open Drain: MAX6369/71/73).................-0.3V to +6V WDO (Push-Pull: MAX6370/72/74 .......-0.3V to (V CC + 0.3V)SET0, SET1, SET2................................-0.3V to (V CC + 0.3V)Maximum Current, Any Pin (input/output)...........................20mAContinuous Power Dissipation (T A = +70°C)SOT23-8 (derate 8.75mW/°C above +70°C)...............700mW Operating Temperature Range ...........................-40°C to +85°C Storage Temperature Range.............................-65°C to +150°C Junction Temperature......................................................+150°C Lead Temperature (soldering, 10s).................................+300°C V CC Rise or Fall Rate......................................................0.05V/µsMAX6369–MAX6374Pin-Selectable Watchdog Timers_______________________________________________________________________________________3ELECTRICAL CHARACTERISTICS (continued)M A X 6369–M A X 6374Pin-Selectable Watchdog Timers 4_______________________________________________________________________________________461081214-4010-15356085SUPPLY CURRENT vs. TEMPERATURETEMPERATURE (°C)S U P P L Y C U R R E N T (µA )Typical Operating Characteristics(Circuit of Figure 1, T A = +25°C, unless otherwise noted .)0.9970.9990.9981.0011.0001.0021.003-4010-15356085WATCHDOG TIMEOUT PERIODvs. TEMPERATUREM A X 6369/74-02TEMPERATURE (°C)N O R M A L I Z E D W A T C H D O G T I M E O U T P E R I O DELECTRICAL CHARACTERISTICS (continued)Note 2:Guaranteed by design.Note 3:In this setting the watchdog timer is inactive and startup delay ends when WDI sees its first level transition. See SelectingDevice Timing for more information.Note 4:After power-up, or a setting change, there is an internal setup time during which WDI is ignored.MAX6369–MAX6374Pin-Selectable Watchdog Timers_______________________________________________________________________________________5Pin DescriptionDetailed DescriptionThe MAX6369–MAX6374 are flexible watchdog circuits for monitoring µP activity. During normal operation, the internal timer is cleared each time the µP toggles the WDI with a valid logic transition (low to high or high to low) within the selected timeout period (t WD ). The WDO remains high as long as the input is strobed within the selected timeout period. If the input is not strobed before the timeout period expires, the watchdog output is asserted low for the watchdog output pulse width (t WDO ). The device type and the state of the three logic control pins (SET0, SET1, and SET2) determine watch-dog timing characteristics. The three basic timing varia-tions for the watchdog startup delay and the normalTable 1 for the timeout characteristics for all devices in the family):•Watchdog Startup Delay:Provides an initial delay before the watchdog timer is started.Allows time for the µP system to power up and initial-ize before assuming responsibility for normal watch-dog timer updates.Includes several fixed or pin-selectable startup delay options from 200µs to 60s, and an option to wait for the first watchdog input transition before starting the watchdog timer.M A X 6369–M A X 6374Pin-Selectable Watchdog Timers 6_______________________________________________________________________________________•Watchdog Timeout Period:Normal operating watchdog timeout period after the initial startup delay.A watchdog output pulse is asserted if a valid watch-dog input transition is not received before the timeout period elapses.Eight pin-selectable timeout period options for each device, from 30µs to 60s.Pin-selectable watchdog timer disable feature.•Watchdog Output/Timing Options:Open drain, active low with 100ms minimum watch-dog output pulse (MAX6369/MAX6371/MAX6373).Push-pull, active low with 1ms minimum watchdog output pulse (MAX6370/MAX6372/MAX6374).Each device has a watchdog startup delay that is initi-ated when the supervisor is first powered or after the user modifies any of the logic control set inputs. The watchdog timer does not begin to count down until theFigure 1. Functional Diagramcompletion of the startup delay period, and no watch-dog output pulses are asserted during the startup delay. When the startup delay expires, the watchdog begins counting its normal watchdog timeout period and waiting for WDI transitions. The startup delay allows time for the µP system to power up and fully ini-tialize before assuming responsibility for the normal watchdog timer updates. Startup delay periods vary between the different devices and may be altered by the logic control set pins. To ensure that the system generates no undesired watchdog outputs, the routine watchdog input transitions should begin before the selected minimum startup delay period has expired. The normal watchdog timeout period countdown is initi-ated when the startup delay is complete. If a valid logic transition is not recognized at WDI before the watchdog timeout period has expired, the supervisor asserts a watchdog output. Watchdog timeout periods vary between the different devices and may be altered by the logic control set pins. To ensure that the system generates no undesired watchdog outputs, the watch-dog input transitions should occur before the selected minimum watchdog timeout period has expired.The startup delay and the watchdog timeout period are determined by the states of the SET0, SET1, and SET2 pins, and by the particular device within the family. For the MAX6369 and MAX6370, the startup delay is equal to the watchdog timeout period. The startup and watchdog timeout periods are pin selectable from 1ms to 60s (minimum).For the MAX6371 and MAX6372, the startup delay is fixed at 60s and the watchdog timeout period is pin selectable from 1ms to 60s (minimum).The MAX6373/MAX6374 provide two timing variations for the startup delay and normal watchdog timeout. Five of the pin-selectable modes provide startup delays from 200µs to 60s minimum, and watchdog timeout delays from 3ms to 10s minimum. Two of the selectable modes do not initiate the watchdog timer until the device receives its first valid watchdog input transition (there is no fixed period by which the first input must be received). These two extended startup delay modesare useful for applications requiring more than 60s for system initialization.All the MAX6369–MAX6374 devices may be disabledwith the proper logic control pin setting (Table 1).Applications InformationInput Signal Considerations Watchdog timing is measured from the last WDI risingor falling edge associated with a pulse of at least 100nsin width. WDI transitions are ignored when WDO is asserted, and during the startup delay period (Figure2). Watchdog input transitions are also ignored for asetup period, t SETUP, of up to 300µs after power-up ora setting change (Figure 3).Selecting Device TimingSET2, SET1, and SET0 program the startup delay and watchdog timeout periods (Table 1). Timeout settingscan be hard wired, or they can be controlled with logicgates and modified during operation. To ensure smooth transitions, the system should strobe WDI immediately before the timing settings are changed. This minimizesthe risk of initializing a setting change too late in thetimer countdown period and generating undesired watchdog outputs. After changing the timing settings,two outcomes are possible based on WDO. If the change is made while WDO is asserted, the previous setting is allowed to finish, the characteristics of thenew setting are assumed, and the new startup phase is entered after a 300µs setup time (t SETUP) elapses. Ifthe change is made while WDO is not asserted, thenew setting is initiated immediately, and the new start-up phase is entered after the 300µs setup time elapses.MAX6369–MAX6374Pin-Selectable Watchdog Timers_______________________________________________________________________________________7 Figure 3. Setting Change TimingM A X 6369–M A X 6374Pin-Selectable Watchdog TimersSelecting 011 (SET2 = 0, SET1 = 1, SET0 = 1) disables the watchdog timer function on all devices in the family.Operation can be reenabled without powering down by changing the set inputs to the new desired setting. The device assumes the new selected timing characteris-tics and enter the startup phase after the 300µs setup time elapses (Figure 3).The MAX6373/MAX6374 offer a first-edge feature. In first-edge mode (settings 101 or 110, Table 1), the internal timer does not control the startup delay period.Instead, startup terminates when WDI sees a transition.If changing to first-edge mode while the device is oper-ating, disable mode must be entered first. It is then safe to select first-edge mode. Entering disable mode first ensures the output is unasserted when selecting first-edge mode and removes the danger of WDI being masked out.OutputThe MAX6369/MAX6371/MAX6373 have an active-low,open-drain output that provides a watchdog output pulse of 100ms. This output structure sinks current when WDO is asserted. Connect a pullup resistor from WDO to any supply voltage up to +5.5V.Select a resistor value large enough to register a logic low (see Ele ctrical Characte ristics ), and small enoughto register a logic high while supplying all input current and leakage paths connected to the WDO line. A 10k Ωpullup is sufficient in most applications. The MAX6370/MAX6372/MAX6374 have push-pull outputs that pro-vide an active-low watchdog output pulse of 1ms.When WDO deasserts, timing begins again at the beginning of the watchdog timeout period (Figure 2).Usage in Noisy EnvironmentsIf using the watchdog timer in an electrically noisy envi-ronment, a bypass capacitor of 0.1µF should be con-nected between V CC and GND as close to the device as possible, and no further away than 0.2 inches.________________Watchdog SoftwareConsiderationsTo help the watchdog timer monitor software execution more closely, set and reset the watchdog input at differ-ent points in the program, rather than pulsing the watch-dog input high-low-high or low-high-low. This technique avoids a stuck loop, in which the watchdog timer would continue to be reset inside the loop, keeping the watch-dog from timing out. Figure 4 shows an example of a flow diagram where the I/O driving the watchdog input is set high at the beginning of the program, set low at the end of every subroutine or loop, then set high again when the program returns to the beginning. If the pro-gram should hang in any subroutine, the problem would be quickly corrected, since the I/O is continually set low and the watchdog timer is allowed to time out, causing WDO to pulse.Figure 4. Watchdog Flow DiagramChip InformationTRANSISTOR COUNT: 1500PROCESS: BiCMOSPin ConfigurationMaxim cannot assume re sponsibility for use of any circuitry othe r than circuitry e ntire ly e mbodie d in a Maxim product. No circuit pate nt lice nse s 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©2005 Maxim Integrated ProductsPrinted USAis a registered trademark of Maxim Integrated Products, Inc.。

MCC半导体电源模块说明书

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F 0.018 0.024 0.46 0.60
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MAX222CWN中文资料

General DescriptionThe MAX220–MAX249 family of line drivers/receivers is intended for all EIA/TIA-232E and V.28/V.24 communica-tions interfaces, particularly applications where ±12V is not available.These parts are especially useful in battery-powered sys-tems, since their low-power shutdown mode reduces power dissipation to less than 5µW. The MAX225,MAX233, MAX235, and MAX245/MAX246/MAX247 use no external components and are recommended for appli-cations where printed circuit board space is critical.________________________ApplicationsPortable Computers Low-Power Modems Interface TranslationBattery-Powered RS-232 Systems Multidrop RS-232 NetworksNext-Generation Device Features♦For Low-Voltage, Integrated ESD ApplicationsMAX3222E/MAX3232E/MAX3237E/MAX3241E/MAX3246E: +3.0V to +5.5V, Low-Power, Up to 1Mbps, True RS-232 Transceivers Using Four 0.1µF External Capacitors (MAX3246E Available in a UCSP™Package)♦For Low-Cost ApplicationsMAX221E: ±15kV ESD-Protected, +5V, 1µA,Single RS-232 Transceiver with AutoShutdown™MAX220–MAX249+5V-Powered, Multichannel RS-232Drivers/Receivers________________________________________________________________Maxim Integrated Products 1Selection Table19-4323; Rev 15; 1/06Power No. of NominalSHDN RxPart Supply RS-232No. of Cap. Value & Three-Active in Data Rate Number (V)Drivers/Rx Ext. Caps (µF)State SHDN (kbps)FeaturesMAX220+52/240.047/0.33No —120Ultra-low-power, industry-standard pinout MAX222+52/2 4 0.1Yes —200Low-power shutdownMAX223 (MAX213)+54/54 1.0 (0.1)Yes ✔120MAX241 and receivers active in shutdown MAX225+55/50—Yes ✔120Available in SOMAX230 (MAX200)+55/04 1.0 (0.1)Yes —120 5 drivers with shutdownMAX231 (MAX201)+5 and2/2 2 1.0 (0.1)No —120Standard +5/+12V or battery supplies; +7.5 to +13.2same functions as MAX232MAX232 (MAX202)+52/24 1.0 (0.1)No —120 (64)Industry standardMAX232A+52/240.1No —200Higher slew rate, small caps MAX233 (MAX203)+52/20— No —120No external capsMAX233A+52/20—No —200No external caps, high slew rate MAX234 (MAX204)+54/04 1.0 (0.1)No —120Replaces 1488MAX235 (MAX205)+55/50—Yes —120No external capsMAX236 (MAX206)+54/34 1.0 (0.1)Yes —120Shutdown, three stateMAX237 (MAX207)+55/34 1.0 (0.1)No —120Complements IBM PC serial port MAX238 (MAX208)+54/44 1.0 (0.1)No —120Replaces 1488 and 1489MAX239 (MAX209)+5 and3/52 1.0 (0.1)No —120Standard +5/+12V or battery supplies;+7.5 to +13.2single-package solution for IBM PC serial port MAX240+55/54 1.0Yes —120DIP or flatpack package MAX241 (MAX211)+54/54 1.0 (0.1)Yes —120Complete IBM PC serial port MAX242+52/240.1Yes ✔200Separate shutdown and enableMAX243+52/240.1No —200Open-line detection simplifies cabling MAX244+58/104 1.0No —120High slew rateMAX245+58/100—Yes ✔120High slew rate, int. caps, two shutdown modes MAX246+58/100—Yes ✔120High slew rate, int. caps, three shutdown modes MAX247+58/90—Yes ✔120High slew rate, int. caps, nine operating modes MAX248+58/84 1.0Yes ✔120High slew rate, selective half-chip enables MAX249+56/1041.0Yes✔120Available in quad flatpack packageFor pricing, delivery, and ordering information,please contact Maxim/Dallas Direct!at 1-888-629-4642, or visit Maxim’s website at .Ordering InformationOrdering Information continued at end of data sheet.*Contact factory for dice specifications.AutoShutdown and UCSP are trademarks of Maxim Integrated Products, Inc.M A X 220–M A X 249+5V-Powered, Multichannel RS-232Drivers/Receivers 2_______________________________________________________________________________________ABSOLUTE MAXIMUM RATINGS—MAX220/222/232A/233A/242/243ELECTRICAL CHARACTERISTICS—MAX220/222/232A/233A/242/243Note 1:For the MAX220, V+ and V- can have a maximum magnitude of 7V, but their absolute difference cannot exceed 13V.Note 2:Input voltage measured with T OUT in high-impedance state, SHDN or V CC = 0V.Note 3:Maximum reflow temperature for the MAX233A is +225°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 Voltage (V CC )...............................................-0.3V to +6V V+ (Note 1)..................................................(V CC - 0.3V) to +14V V- (Note 1).............................................................+0.3V to +14V Input VoltagesT IN ..............................................................-0.3V to (V CC - 0.3V)R IN (Except MAX220)........................................................±30V R IN (MAX220).....................................................................±25V T OUT (Except MAX220) (Note 2).......................................±15V T OUT (MAX220)...............................................................±13.2V Output VoltagesT OUT ...................................................................................±15V R OUT .........................................................-0.3V to (V CC + 0.3V)Driver/Receiver Output Short Circuited to GND.........Continuous Continuous Power Dissipation (T A = +70°C)16-Pin Plastic DIP (derate 10.53mW/°C above +70°C)..842mW18-Pin Plastic DIP (derate 11.11mW/°C above +70°C)..889mW 20-Pin Plastic DIP (derate 8.00mW/°C above +70°C)..440mW 16-Pin Narrow SO (derate 8.70mW/°C above +70°C)...696mW 16-Pin Wide SO (derate 9.52mW/°C above +70°C)......762mW 18-Pin Wide SO (derate 9.52mW/°C above +70°C)......762mW 20-Pin Wide SO (derate 10.00mW/°C above +70°C)....800mW 20-Pin SSOP (derate 8.00mW/°C above +70°C)..........640mW 16-Pin CERDIP (derate 10.00mW/°C above +70°C).....800mW 18-Pin CERDIP (derate 10.53mW/°C above +70°C).....842mW Operating Temperature RangesMAX2_ _AC_ _, MAX2_ _C_ _.............................0°C to +70°C MAX2_ _AE_ _, MAX2_ _E_ _..........................-40°C to +85°C MAX2_ _AM_ _, MAX2_ _M_ _.......................-55°C to +125°C Storage Temperature Range.............................-65°C to +160°C Lead Temperature (soldering, 10s) (Note 3)...................+300°CMAX220–MAX249+5V-Powered, Multichannel RS-232Drivers/Receivers_______________________________________________________________________________________3Note 4:MAX243 R2OUT IN ELECTRICAL CHARACTERISTICS—MAX220/222/232A/233A/242/243 (continued)M A X 220–M A X 249+5V-Powered, Multichannel RS-232Drivers/Receivers 4_________________________________________________________________________________________________________________________________Typical Operating CharacteristicsMAX220/MAX222/MAX232A/MAX233A/MAX242/MAX243108-1051525OUTPUT VOLTAGE vs. LOAD CURRENT-4-6-8-2642LOAD CURRENT (mA)O U T P U T V O L T A G E (V )1002011104104060AVAILABLE OUTPUT CURRENTvs. DATA RATE65798DATA RATE (kb/s)O U T P U T C U R R E N T (m A )203050+10V-10VMAX222/MAX242ON-TIME EXITING SHUTDOWN+5V +5V 0V0V 500μs/div V +, V - V O L T A G E (V )ELECTRICAL CHARACTERISTICS—MAX220/222/232A/233A/242/243 (continued)(V CC = +5V ±10%, C1–C4 = 0.1µF‚ MAX220, C1 = 0.047µF, C2–C4 = 0.33µF, T A = T MIN to T MAX ‚ unless otherwise noted.)MAX220–MAX249+5V-Powered, Multichannel RS-232Drivers/Receivers_______________________________________________________________________________________5V CC ...........................................................................-0.3V to +6V V+................................................................(V CC - 0.3V) to +14V V-............................................................................+0.3V to -14V Input VoltagesT IN ............................................................-0.3V to (V CC + 0.3V)R IN ......................................................................................±30V Output VoltagesT OUT ...................................................(V+ + 0.3V) to (V- - 0.3V)R OUT .........................................................-0.3V to (V CC + 0.3V)Short-Circuit Duration, T OUT ......................................Continuous Continuous Power Dissipation (T A = +70°C)14-Pin Plastic DIP (derate 10.00mW/°C above +70°C)....800mW 16-Pin Plastic DIP (derate 10.53mW/°C above +70°C)....842mW 20-Pin Plastic DIP (derate 11.11mW/°C above +70°C)....889mW 24-Pin Narrow Plastic DIP(derate 13.33mW/°C above +70°C)..........1.07W24-Pin Plastic DIP (derate 9.09mW/°C above +70°C)......500mW 16-Pin Wide SO (derate 9.52mW/°C above +70°C).........762mW20-Pin Wide SO (derate 10.00mW/°C above +70°C).......800mW 24-Pin Wide SO (derate 11.76mW/°C above +70°C).......941mW 28-Pin Wide SO (derate 12.50mW/°C above +70°C) .............1W 44-Pin Plastic FP (derate 11.11mW/°C above +70°C).....889mW 14-Pin CERDIP (derate 9.09mW/°C above +70°C)..........727mW 16-Pin CERDIP (derate 10.00mW/°C above +70°C)........800mW 20-Pin CERDIP (derate 11.11mW/°C above +70°C)........889mW 24-Pin Narrow CERDIP(derate 12.50mW/°C above +70°C)..............1W24-Pin Sidebraze (derate 20.0mW/°C above +70°C)..........1.6W 28-Pin SSOP (derate 9.52mW/°C above +70°C).............762mW Operating Temperature RangesMAX2 _ _ C _ _......................................................0°C to +70°C MAX2 _ _ E _ _...................................................-40°C to +85°C MAX2 _ _ M _ _......................................................-55°C to +125°C Storage Temperature Range.............................-65°C to +160°C Lead Temperature (soldering, 10s) (Note 4)...................+300°CABSOLUTE MAXIMUM RATINGS—MAX223/MAX230–MAX241ELECTRICAL CHARACTERISTICS—MAX223/MAX230–MAX241(MAX223/230/232/234/236/237/238/240/241, V CC = +5V ±10; MAX233/MAX235, V CC = 5V ±5%‚ C1–C4 = 1.0µF; MAX231/MAX239,V CC = 5V ±10%; V+ = 7.5V to 13.2V; T A = T MIN to T MAX ; unless otherwise noted.)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.Note 4:Maximum reflow temperature for the MAX233/MAX235 is +225°C.M A X 220–M A X 249+5V-Powered, Multichannel RS-232Drivers/Receivers 6_______________________________________________________________________________________ELECTRICAL CHARACTERISTICS—MAX223/MAX230–MAX241 (continued)(MAX223/230/232/234/236/237/238/240/241, V CC = +5V ±10; MAX233/MAX235, V CC = 5V ±5%‚ C1–C4 = 1.0µF; MAX231/MAX239,V CC = 5V ±10%; V+ = 7.5V to 13.2V; T A = T MIN to T MAX ; unless otherwise noted.)MAX220–MAX249+5V-Powered, Multichannel RS-232Drivers/Receivers_______________________________________________________________________________________78.56.54.55.5TRANSMITTER OUTPUT VOLTAGE (V OH ) vs. V CC7.08.0V CC (V)V O H (V )5.07.57.46.02500TRANSMITTER OUTPUT VOLTAGE (V OH )vs. LOAD CAPACITANCE AT DIFFERENT DATA RATES6.46.27.27.0LOAD CAPACITANCE (pF)V O H (V )1500100050020006.86.612.04.02500TRANSMITTER SLEW RATE vs. LOAD CAPACITANCE6.05.011.09.010.0LOAD CAPACITANCE (pF)S L E W R A T E (V /μs )1500100050020008.07.0-6.0-9.04.55.5TRANSMITTER OUTPUT VOLTAGE (V OL ) vs. V CC-8.0-8.5-6.5-7.0V CC (V)V O L (V )5.0-7.5-6.0-7.62500TRANSMITTER OUTPUT VOLTAGE (V OL )vs. LOAD CAPACITANCE AT DIFFERENT DATA RATES-7.0-7.2-7.4-6.2-6.4LOAD CAPACITANCE (pF)V O L (V )150010005002000-6.6-6.810-105101520253035404550TRANSMITTER OUTPUT VOLTAGE (V+, V-)vs. LOAD CURRENT-2-6-4-886CURRENT (mA)V +, V - (V )420__________________________________________Typical Operating CharacteristicsMAX223/MAX230–MAX241*SHUTDOWN POLARITY IS REVERSED FOR NON MAX241 PARTSV+, V- WHEN EXITING SHUTDOWN(1μF CAPACITORS)MAX220-13SHDN*V-O V+500ms/divM A X 220–M A X 249+5V-Powered, Multichannel RS-232Drivers/Receivers 8_______________________________________________________________________________________ABSOLUTE MAXIMUM RATINGS—MAX225/MAX244–MAX249ELECTRICAL CHARACTERISTICS—MAX225/MAX244–MAX249(MAX225, V CC = 5.0V ±5%; MAX244–MAX249, V CC = +5.0V ±10%, external capacitors C1–C4 = 1µF; T A = T MIN to T MAX ; unless oth-erwise noted.)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 Voltage (V CC )...............................................-0.3V to +6V Input VoltagesT IN ‚ ENA , ENB , ENR , ENT , ENRA ,ENRB , ENTA , ENTB ..................................-0.3V to (V CC + 0.3V)R IN .....................................................................................±25V T OUT (Note 5).....................................................................±15V R OUT ........................................................-0.3V to (V CC + 0.3V)Short Circuit (one output at a time)T OUT to GND............................................................Continuous R OUT to GND............................................................ContinuousContinuous Power Dissipation (T A = +70°C)28-Pin Wide SO (derate 12.50mW/°C above +70°C).............1W 40-Pin Plastic DIP (derate 11.11mW/°C above +70°C)...611mW 44-Pin PLCC (derate 13.33mW/°C above +70°C)...........1.07W Operating Temperature RangesMAX225C_ _, MAX24_C_ _ ..................................0°C to +70°C MAX225E_ _, MAX24_E_ _ ...............................-40°C to +85°C Storage Temperature Range.............................-65°C to +160°C Lead Temperature (soldering,10s) (Note 6)....................+300°CNote 5:Input voltage measured with transmitter output in a high-impedance state, shutdown, or V CC = 0V.Note 6:Maximum reflow temperature for the MAX225/MAX245/MAX246/MAX247 is +225°C.MAX220–MAX249+5V-Powered, Multichannel RS-232Drivers/Receivers_______________________________________________________________________________________9Note 7:The 300Ωminimum specification complies with EIA/TIA-232E, but the actual resistance when in shutdown mode or V CC =0V is 10M Ωas is implied by the leakage specification.ELECTRICAL CHARACTERISTICS—MAX225/MAX244–MAX249 (continued)(MAX225, V CC = 5.0V ±5%; MAX244–MAX249, V CC = +5.0V ±10%, external capacitors C1–C4 = 1µF; T A = T MIN to T MAX ; unless oth-erwise noted.)M A X 220–M A X 249+5V-Powered, Multichannel RS-232Drivers/Receivers 10________________________________________________________________________________________________________________________________Typical Operating CharacteristicsMAX225/MAX244–MAX24918212345TRANSMITTER SLEW RATE vs. LOAD CAPACITANCE86416LOAD CAPACITANCE (nF)T R A N S M I T T E R S L E W R A T E (V /μs )14121010-105101520253035OUTPUT VOLTAGEvs. LOAD CURRENT FOR V+ AND V--2-4-6-88LOAD CURRENT (mA)O U T P U T V O L T A G E (V )64209.05.012345TRANSMITTER OUTPUT VOLTAGE (V+, V-)vs. LOAD CAPACITANCE AT DIFFERENT DATA RATES6.05.58.5LOAD CAPACITANCE (nF)V +, V (V )8.07.57.06.5MAX220–MAX249Drivers/ReceiversFigure 1. Transmitter Propagation-Delay Timing Figure 2. Receiver Propagation-Delay TimingFigure 3. Receiver-Output Enable and Disable Timing Figure 4. Transmitter-Output Disable TimingM A X 220–M A X 249Drivers/Receivers ENT ENR OPERATION STATUS TRANSMITTERSRECEIVERS00Normal Operation All Active All Active 01Normal Operation All Active All 3-State10Shutdown All 3-State All Low-Power Receive Mode 11ShutdownAll 3-StateAll 3-StateTable 1a. MAX245 Control Pin ConfigurationsENT ENR OPERATION STATUS TRANSMITTERS RECEIVERSTA1–TA4TB1–TB4RA1–RA5RB1–RB500Normal Operation All Active All Active All Active All Active 01Normal Operation All Active All Active RA1–RA4 3-State,RA5 Active RB1–RB4 3-State,RB5 Active 1ShutdownAll 3-StateAll 3-StateAll Low-Power Receive Mode All Low-Power Receive Mode 11Shutdown All 3-State All 3-StateRA1–RA4 3-State,RA5 Low-Power Receive ModeRB1–RB4 3-State,RB5 Low-Power Receive ModeTable 1b. MAX245 Control Pin ConfigurationsTable 1c. MAX246 Control Pin ConfigurationsENA ENB OPERATION STATUS TRANSMITTERS RECEIVERSTA1–TA4TB1–TB4RA1–RA5RB1–RB500Normal Operation All Active All Active All Active All Active 01Normal Operation All Active All 3-State All Active RB1–RB4 3-State,RB5 Active 1ShutdownAll 3-StateAll ActiveRA1–RA4 3-State,RA5 Active All Active 11Shutdown All 3-State All 3-StateRA1–RA4 3-State,RA5 Low-Power Receive ModeRB1–RB4 3-State,RA5 Low-Power Receive ModeMAX220–MAX249Drivers/ReceiversM A X 220–M A X 249_______________Detailed DescriptionThe MAX220–MAX249 contain four sections: dual charge-pump DC-DC voltage converters, RS-232 dri-vers, RS-232 receivers, and receiver and transmitter enable control inputs.Dual Charge-Pump Voltage ConverterThe MAX220–MAX249 have two internal charge-pumps that convert +5V to ±10V (unloaded) for RS-232 driver operation. The first converter uses capacitor C1 to dou-ble the +5V input to +10V on C3 at the V+ output. The second converter uses capacitor C2 to invert +10V to -10V on C4 at the V- output.A small amount of power may be drawn from the +10V (V+) and -10V (V-) outputs to power external circuitry (see the Typical Operating Characteristics section),except on the MAX225 and MAX245–MAX247, where these pins are not available. V+ and V- are not regulated,so the output voltage drops with increasing load current.Do not load V+ and V- to a point that violates the mini-mum ±5V EIA/TIA-232E driver output voltage when sourcing current from V+ and V- to external circuitry. When using the shutdown feature in the MAX222,MAX225, MAX230, MAX235, MAX236, MAX240,MAX241, and MAX245–MAX249, avoid using V+ and V-to power external circuitry. When these parts are shut down, V- falls to 0V, and V+ falls to +5V. For applica-tions where a +10V external supply is applied to the V+pin (instead of using the internal charge pump to gen-erate +10V), the C1 capacitor must not be installed and the SHDN pin must be tied to V CC . This is because V+is internally connected to V CC in shutdown mode.RS-232 DriversThe typical driver output voltage swing is ±8V when loaded with a nominal 5k ΩRS-232 receiver and V CC =+5V. Output swing is guaranteed to meet the EIA/TIA-232E and V.28 specification, which calls for ±5V mini-mum driver output levels under worst-case conditions.These include a minimum 3k Ωload, V CC = +4.5V, and maximum operating temperature. Unloaded driver out-put voltage ranges from (V+ -1.3V) to (V- +0.5V).Input thresholds are both TTL and CMOS compatible.The inputs of unused drivers can be left unconnected since 400k Ωinput pullup resistors to V CC are built in (except for the MAX220). The pullup resistors force the outputs of unused drivers low because all drivers invert.The internal input pullup resistors typically source 12µA,except in shutdown mode where the pullups are dis-abled. Driver outputs turn off and enter a high-imped-ance state—where leakage current is typically microamperes (maximum 25µA)—when in shutdownmode, in three-state mode, or when device power is removed. Outputs can be driven to ±15V. The power-supply current typically drops to 8µA in shutdown mode.The MAX220 does not have pullup resistors to force the outputs of the unused drivers low. Connect unused inputs to GND or V CC .The MAX239 has a receiver three-state control line, and the MAX223, MAX225, MAX235, MAX236, MAX240,and MAX241 have both a receiver three-state control line and a low-power shutdown control. Table 2 shows the effects of the shutdown control and receiver three-state control on the receiver outputs.The receiver TTL/CMOS outputs are in a high-imped-ance, three-state mode whenever the three-state enable line is high (for the MAX225/MAX235/MAX236/MAX239–MAX241), and are also high-impedance whenever the shutdown control line is high.When in low-power shutdown mode, the driver outputs are turned off and their leakage current is less than 1µA with the driver output pulled to ground. The driver output leakage remains less than 1µA, even if the transmitter output is backdriven between 0V and (V CC + 6V). Below -0.5V, the transmitter is diode clamped to ground with 1k Ωseries impedance. The transmitter is also zener clamped to approximately V CC + 6V, with a series impedance of 1k Ω.The driver output slew rate is limited to less than 30V/µs as required by the EIA/TIA-232E and V.28 specifica-tions. Typical slew rates are 24V/µs unloaded and 10V/µs loaded with 3Ωand 2500pF.RS-232 ReceiversEIA/TIA-232E and V.28 specifications define a voltage level greater than 3V as a logic 0, so all receivers invert.Input thresholds are set at 0.8V and 2.4V, so receivers respond to TTL level inputs as well as EIA/TIA-232E and V.28 levels.The receiver inputs withstand an input overvoltage up to ±25V and provide input terminating resistors withDrivers/ReceiversTable 2. Three-State Control of ReceiversMAX220–MAX249Drivers/Receiversnominal 5k Ωvalues. The receivers implement Type 1interpretation of the fault conditions of V.28 and EIA/TIA-232E.The receiver input hysteresis is typically 0.5V with a guaranteed minimum of 0.2V. This produces clear out-put transitions with slow-moving input signals, even with moderate amounts of noise and ringing. The receiver propagation delay is typically 600ns and is independent of input swing direction.Low-Power Receive ModeThe low-power receive mode feature of the MAX223,MAX242, and MAX245–MAX249 puts the IC into shut-down mode but still allows it to receive information. This is important for applications where systems are periodi-cally awakened to look for activity. Using low-power receive mode, the system can still receive a signal that will activate it on command and prepare it for communi-cation at faster data rates. This operation conserves system power.Negative Threshold—MAX243The MAX243 is pin compatible with the MAX232A, differ-ing only in that RS-232 cable fault protection is removed on one of the two receiver inputs. This means that control lines such as CTS and RTS can either be driven or left floating without interrupting communication. Different cables are not needed to interface with different pieces of equipment.The input threshold of the receiver without cable fault protection is -0.8V rather than +1.4V. Its output goes positive only if the input is connected to a control line that is actively driven negative. If not driven, it defaults to the 0 or “OK to send” state. Normally‚ the MAX243’s other receiver (+1.4V threshold) is used for the data line (TD or RD)‚ while the negative threshold receiver is con-nected to the control line (DTR‚ DTS‚ CTS‚ RTS, etc.). Other members of the RS-232 family implement the optional cable fault protection as specified by EIA/TIA-232E specifications. This means a receiver output goes high whenever its input is driven negative‚ left floating‚or shorted to ground. The high output tells the serial communications IC to stop sending data. To avoid this‚the control lines must either be driven or connected with jumpers to an appropriate positive voltage level.Shutdown—MAX222–MAX242On the MAX222‚ MAX235‚ MAX236‚ MAX240‚ and MAX241‚ all receivers are disabled during shutdown.On the MAX223 and MAX242‚ two receivers continue to operate in a reduced power mode when the chip is in shutdown. Under these conditions‚ the propagation delay increases to about 2.5µs for a high-to-low input transition. When in shutdown, the receiver acts as a CMOS inverter with no hysteresis. The MAX223 and MAX242 also have a receiver output enable input (EN for the MAX242 and EN for the MAX223) that allows receiver output control independent of SHDN (SHDN for MAX241). With all other devices‚ SHDN (SH DN for MAX241) also disables the receiver outputs.The MAX225 provides five transmitters and five receivers‚ while the MAX245 provides ten receivers and eight transmitters. Both devices have separate receiver and transmitter-enable controls. The charge pumps turn off and the devices shut down when a logic high is applied to the ENT input. In this state, the supply cur-rent drops to less than 25µA and the receivers continue to operate in a low-power receive mode. Driver outputs enter a high-impedance state (three-state mode). On the MAX225‚ all five receivers are controlled by the ENR input. On the MAX245‚ eight of the receiver out-puts are controlled by the ENR input‚ while the remain-ing two receivers (RA5 and RB5) are always active.RA1–RA4 and RB1–RB4 are put in a three-state mode when ENR is a logic high.Receiver and Transmitter EnableControl InputsThe MAX225 and MAX245–MAX249 feature transmitter and receiver enable controls.The receivers have three modes of operation: full-speed receive (normal active)‚ three-state (disabled)‚ and low-power receive (enabled receivers continue to function at lower data rates). The receiver enable inputs control the full-speed receive and three-state modes. The transmitters have two modes of operation: full-speed transmit (normal active) and three-state (disabled). The transmitter enable inputs also control the shutdown mode. The device enters shutdown mode when all transmitters are disabled. Enabled receivers function in the low-power receive mode when in shutdown.M A X 220–M A X 249Tables 1a–1d define the control states. The MAX244has no control pins and is not included in these tables. The MAX246 has ten receivers and eight drivers with two control pins, each controlling one side of the device. A logic high at the A-side control input (ENA )causes the four A-side receivers and drivers to go into a three-state mode. Similarly, the B-side control input (ENB ) causes the four B-side drivers and receivers to go into a three-state mode. As in the MAX245, one A-side and one B-side receiver (RA5 and RB5) remain active at all times. The entire device is put into shut-down mode when both the A and B sides are disabled (ENA = ENB = +5V).The MAX247 provides nine receivers and eight drivers with four control pins. The ENRA and ENRB receiver enable inputs each control four receiver outputs. The ENTA and ENTB transmitter enable inputs each control four drivers. The ninth receiver (RB5) is always active.The device enters shutdown mode with a logic high on both ENTA and ENTB .The MAX248 provides eight receivers and eight drivers with four control pins. The ENRA and ENRB receiver enable inputs each control four receiver outputs. The ENTA and ENTB transmitter enable inputs control four drivers each. This part does not have an always-active receiver. The device enters shutdown mode and trans-mitters go into a three-state mode with a logic high on both ENTA and ENTB .The MAX249 provides ten receivers and six drivers with four control pins. The ENRA and ENRB receiver enable inputs each control five receiver outputs. The ENTA and ENTB transmitter enable inputs control three dri-vers each. There is no always-active receiver. The device enters shutdown mode and transmitters go into a three-state mode with a logic high on both ENTA and ENTB . In shutdown mode, active receivers operate in a low-power receive mode at data rates up to 20kb/s.__________Applications InformationFigures 5 through 25 show pin configurations and typi-cal operating circuits. In applications that are sensitive to power-supply noise, V CC should be decoupled to ground with a capacitor of the same value as C1 and C2 connected as close as possible to the device.Drivers/Receivers。

MAX479CSD+T中文资料

___________________________Features
o 17µA Max Supply Current (MAX478A/MAX479A) o 70µV Max Offset Voltage (MAX478A) o Single-Supply Operation: Input Voltage Range Includes Ground Output Swings to Ground While Sinking Current No Pull-Down Resistors Required o Dual Op Amp in 8-Pin DIP/SO Package (MAX478) Quad Op Amp in 14-Pin DIP/SO Package (MAX479) o 250pA Max Input Offset Current (MAX478A/MAX479A) o 0.5µV/°C Offset-Voltage Drift o Output Sources and Sinks 5mA Load Current
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.

MCCSEMI 电路保护设备说明书

Maximum DC Reverse Current At Rated DC Blocking Voltage
IR
5μA 500μA
TJ = 25°C TJ = 125°C
Rating for fusing
I2t 106.24A2s t<8.3ms 51.2 A2s t<1.0ms
Typical Junction Capacitance
4
3
2
1
Single Phase Half Wave 60Hz Resistive or Inductive Load
0
0
25
50
75
100
125
150
Case Temperature (°C)
Fig. 3 - Typical Instantaneous Forward Characteristics
*%8$ THRU *%80
(
Features
• +DORJHQ)UHH$YDLODEOH8SRQ5HTXHVW%\$GGLQJ6XIIL[+)
• Lead Free Finish/RoHS Compliant (Note1) ("P"Suffix Designates Compliant. See Ordering Information)
A 0.860 0.880 21.80 22.30
B 0.720 0.740 18.30 18.80
C 0.130 0.142 3.30 3.60
D 0.690 0.717 17.50 18.20
E 0.030 0.039 0.76 1.00
F 0.018 0.024 0.46 0.60

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General DescriptionThe 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 packages and the MAX6384–MAX6390 are avail-able in 4-pin SC70 packages.________________________ApplicationsComputers ControllersIntelligent InstrumentsCritical µP and µC Power Monitoring Portable/Battery-Powered Equipment Dual Voltage SystemsFeatureso Factory-Set Reset Threshold Voltages Ranging from +1.58V to +4.63V in Approximately 100mV Increments o ±2.5% Reset Threshold Accuracy Over Temperature (-40°C to +125°C)o Seven Reset Timeout Periods Available: 1ms,20ms, 140ms, 280ms, 560ms, 1120ms, 1200ms (min)o 3 Reset Output OptionsActive-Low Push-Pull Active-High Push-Pull Active-Low Open-Draino Reset Output State Guaranteed Valid Down to V CC = 1Vo Manual Reset Input (MAX6384/MAX6385/MAX6386)o Auxiliary RESET IN(MAX6387/MAX6388/MAX6389)o V CC Reset Timeout (1120ms or 1200ms)/Manual Reset Timeout (140ms or 150ms) (MAX6390)o Negative-Going V CC Transient Immunity o Low Power Consumption of 6µA at +3.6V and 3µA at +1.8V o Pin Compatible withMAX809/MAX810/MAX803/MAX6326/MAX6327/MAX6328/MAX6346/MAX6347/MAX6348, and MAX6711/MAX6712/MAX6713o Tiny 3-Pin SC70 and 4-Pin SC70 PackagesMAX6381–MAX6390SC70, Single/Dual Low-Voltage, Low-Power µP Reset Circuits________________________________________________________________Maxim Integrated Products1Pin Configurations19-1839; Rev 1; 04/01Ordering InformationOrdering Information continued at end of data sheet.Typical Operating Circuit appears at end of data sheet.Selector Guide appears at end of data sheet.Note:Insert reset threshold suffix (see Reset Threshold table)after "XR" or "XS". 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 (seeStandard 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.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 6381–M A X 6390SC70, Single/Dual Low-Voltage, Low-Power µP Reset CircuitsABSOLUTE 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.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 Operating Temperature Range .........................-40°C to +125°C Storage Temperature Range.............................-65°C to +150°C Lead Temperature (soldering, 10s).................................+300°CMAX6381–MAX6390SC70, Single/Dual Low-Voltage, Low-Power µP Reset Circuits_______________________________________________________________________________________3M A X 6381–M A X 6390SC70, Single/Dual Low-Voltage, Low-Power µP Reset Circuits 4______________________________________________________________________________________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 )0.940.980.961.021.001.061.041.08-40-10520-253550658095110125NORMALIZED 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 D0.9900.9851.0150.9950.9901.0001.0051.0101.020-40-10520-253550958011065125M A X 6381/90 t o c 04TEMPERATURE (°C)N O R M A L I Z E D R E S E TT H 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, Single/Dual Low-Voltage, Low-Power µP Reset Circuits_______________________________________________________________________________________5M A X 6381–M A X 6390SC70, Single/Dual Low-Voltage, Low-Power µP Reset Circuits 6_______________________________________________________________________________________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 be in 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 Ωpullup resistor (1.35k Ωfor 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 magni-tude indicated (reset comparator overdrive). The graph indicates the typical maximum pulse width a negative-going V CC transient may have without causing a reset pulse to be issued. As the magnitude of the transient 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 = 0The MAX6381–MAX6390 are guaranteed to operate properly down to V CC = 1V. In applications that require valid reset levels down to V CC = 0, 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 output can no longer sink or source current. This scheme doesnot 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 Ωis adequate.MAX6381–MAX6390SC70, Single/Dual Low-Voltage, Low-Power µP Reset Circuits_______________________________________________________________________________________7M A X 6381–M A X 6390SC70, Single/Dual Low-Voltage, Low-Power µP Reset Circuits 8Selector GuideChip InformationTRANSISTOR COUNT: 647PROCESS: BiCMOS*MR is for MAX6384/MAX6385/MAX6386/MAX6390**RESET IN is for MAX6387/MAX6388/MAX6389( ) are for MAX6382/MAX6385/MAX6388Pin Configurations (continued)MAX6381–MAX6390SC70, Single/Dual Low-Voltage, Low-Power µP Reset Circuits_______________________________________________________________________________________9Ordering Information(continued)Note:Insert reset threshold suffix (see Reset Threshold table)after "XR" or "XS". 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 (seeStandard 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.M A X 6381–M A X 6390SC70, Single/Dual Low-Voltage, Low-Power µP Reset Circuits 10______________________________________________________________________________________Package InformationSC70, 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____________________11©2001 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.MAX6381–MAX6390Package Information (continued)元器件交易网。