MAX6314US39D3中文资料
MAX3243概述
MAX3243概述概述MAX3243由三个线性驱动器，五个接收器和⼀个双通道电荷泵电路组成，在串⾏端⼝上带有±15KV ESD（HBM，ICE61000-4-2，空⽓放电），±8KV ESD（ICE61000-4-2，接触放电）保护。
该芯⽚迎合TIA/EIA-232-F的需求并提供异步串⾏通信的接⼝，可以应⽤于IBM PC/AT等兼容性设备上。
外部使⽤极⼩的电容⽽产⽣的电荷泵电路，使到芯⽚⼯作电压从3~5.5V即可，另外，该芯⽚包含⼀个常激活态的放⼤输出（ROUT2B），当系统处于休眠中⽤于指⽰传送数据的到来。
该芯⽚可运⾏于⾼达250Kbit/S的传送速率和最⼤30V/uS的切换速率。
当串⾏端⼝处于⾮活动状态时有着灵活的能耗管理⽅式。
当FORCEON为低电平⽽FORCEOFF 为⾼电平时，⾃动关闭特性被激活，在该模式中，若芯⽚不感应RS232上合法的信号，则⽆驱动输出。
当FORCEOFF设置成低电平，驱动器和接收器关闭，⼯作电流减⼩到1uA。
串⾏端⼝不连接或关闭外设可导致⾃动关闭特性的发⽣。
当FORCEON和FORCEOFF同时为⾼电平的时候，⾃动关闭特性是关闭的。
当⾃动关闭特性使能时，对于任何的合法输⼊，芯⽚⾃动激活，并使⽤INVALID引脚对该RS232信号进⾏通报。
当输⼊电压⼤于2.7V或者⼩于-2.7V或在-0.3V~+0.3V之间持续⼩于30uS时INVALID为⾼电平表明数据有效。
如果所有的接收器输⼊电压在-0.3V~+0.3V之内持续⼤于30uS，INVALID为低电平表明数据有误。
MAX3243EC可以在0~70℃之间⼯作，⽽MAX3243EI可以运⾏在-40~85℃的环境下。
特性单芯⽚和单供电接⼝，⽤于IBM PC/AT串⾏端⼝对RS232总线引脚ESD保护（±15KV HBM，⽓隙放电，±8KV ESD接触放电）合适或者超过TIA/EIA-232-F和ITU v.28标准的需求⼯作电压3.0~5.5V常在线放⼤接收输出数据传输速率达500Kbit/s低静态电流，典型值1uA外部电容4*0.1uF3.3V供电时接受5V的逻辑输⼊可与MAX3243E直接替换串⾏搜索驱动能⼒感应不到有效的RS-232信号时⾃动关闭功能DW，DB，PW封装典型电路管脚图。
MAX3490摘出资料(部分中文)
MAX3488, MAX3490，MAX3491 功能，全双工通信，而 MAX3483, MAX3485, MAX3486是专为半双工通信。
单一的电源供应，没有电荷注入；具有+ 5V 逻辑电源互操作；最大偏斜为 8ns ； 2ns 低电流掉电模式；共模输入电压范围：—7〜+ 12V ,总线上允许多达 32个收发器；全双工和半双工版本；具有电流限制和热 关机驱动器过载保护驱动器具有短路电流限制和对功耗过大的保护，热关断电路，驱动器输岀置于高阻抗状态。
接收器输入具 有故障安全功能，保证逻辑高输岀，如果两个输入端开路。
选择MAX3490做RS-422,下图为 MAX3490引脚图1 ——VCC2―― RO 接收器输出 3―― DI 驱动器输入 4 ——GND 5 ---- Y 同相驱动器输出 6 ---- Z 反相驱动器输出 7 ---- B反相接收器输入8——A 同相接收器输入保证数据传输速率（Mbps ） 10电源电压（V ） to 半/全双工 全双工摆率限制 无 驱动器/接收器使 无 关断电流（NA ）关断时无引脚数8频率大，高频谐波明显MAX3490没有接收器发送器使能，控制逻辑如下图Dences 宙Rhouf Receiver/Driver Enable（MAX3488/MAX349a}T^ble 3. Transmitting T^able 4. ReceivingMAX3490 （无RE 、DE 引脚）绝对最大额定值如下图:IN^UTOUTPUTSDI zY 1 D 1 □1INPUTSOUTPUTA. 6 RO *D.2V1 <-a.2v0 Inputs Open1□IP/SOE L叵叵DABSOLUTE MAXIMUM RATINGSS U P P 卜F \ 01 ^3 9 e l\/ kill ■ ■ ■ ■ ■■!■■■■■■ iri ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■■ ■ ■ ■ ■ ■ i ■ ■ ■ r ■ ■ ■ ■ ■ ■ ■Control IrpiJ ValLage (RE, D£) ............... .......... ............... -0.3V ta 7V□rtvsr Inpul Voltage (6l).............. .......... .......... ............... -0.3Vtn 7VOnvar Output VcItaQ* (A,気V, ZX - ......................... -7J5V to12.SVftccer^CF Input VaKagc |A, B) . -7.5V to )2 5VReceiver Ojtput Voltage (RO) . . -O.3Vto (Vcc * 0 3V)Gontinucus Power g$ipmTk?n (T R= +70芒|各Pin Pi/Mc DIP 忖申rate 9 09mWU above +70© 72?mW8-Pin SO (<1HW 5 aarrrtVy «bove +7C P C), 471mW14-Rn Plastic DlP(de<m© 10mW fl C above +70忙》... HOOtrMf14-Rn SO (deia1^ fl.SSmW.^C abaw +70*C> __________ UUJllMfOperating Temperalur?MAXU C .............. ......... *........ ... ..................... -.Ot：to +7[TCMAX3d_ _E__”…lh.. “一,. ,.H.…““-“,-H.⑷乜B +85\：Storage Temperafur? Range lo +16[yCbead Tempeiature [wldering lOlMC)..................................... +XD*CMAX3490驱动器的开关特性如下图:DRIVER SWITCHING CHARACTERISTICS-MAX3465h MAX14$0, and MAX3491ri^E：» 3.3M a T*w *25*CJPARAMtFER CONCilTICNS m TVP MA 9(UNITSDrrwf OHtreftfiii OdljMjt Del叩g■ Sdll, Figure 7 122M mDrvcr Wfe-oEiii Ckrlp ui T M7»C r Time hno良L * fiOtl, Flpm 71&25mEtr p临他n M■丫LCfflMCHHiah Lrvtl IpiLM R L * 37(1. F4l/*a T2235m轉、ion Delay Hl0hi&-Lew Leveli IpML R. - ZTflFiflWWE■Jr22 35tp L n - iPHitl □越g*曲m Dtt&Ff吕的却iH^ie S- IPDS R.fc• 27n, FipL<eS E mDRIVER OUTPUT ENABLEJOIS^BLE TIMES {IWS-iflS'IMLW3-431 聞切Dmw CXJtput tnable r me I Q L OW LE^el tfZL Ri= 110SL f^FLFa 10 45 M OEDiwci" OulpiJl EiwN? Trne tg High Len el S FZH Ri ■ 110(1 钿ure $ 45raDrw CMp讥04»^le Time tom Migih Level fi t* 11(X1. F»flL*t940 to POriw D・*l・ Tim from LwLwi tpLE R L* 11IMI. i&40 BO mDTM< dip Lit Errtb^A Tiffii Au墟电叭旳Lx L#v4l tm Rl ■匚如i 10<8W gm 他Qrta&r ErrtBifi Titre frw 电靜©询|a H(；h 4PCH R; - 1inni FigiLiraS®o r»MAX3490CPA(TCto +70'Q8 Ptasttc DIPMAX349OCSA(TCt口+7D B C\8 SOMAX3490C/D crcto+70e c \Dice'MAX349OEPA-4(rc to +85X8 Plastic DIPMAX349OESA■40X10+9598 SOMAX3490引脚配置与典型工作电路，如下图|l巒4e 2 MAA J4ML JWAJC3啲Pin 8 两#挪询事呵Typ"C^ uftMOTE AEANODE O 8LXF砂*师悶ZKSQW诂沖盟F训卜皿咻斥$钵自Ncrv^OfU MAX3490封装尺寸L -15^ Plastic DIPPLASTIC DU AL-IN-LINE PACKAGE(0.300 in.)DIM [HOMES MLLlWETESS MIN MAA MIN MAXA a 200A1ocn&-■"20 12& C 175 3104-iS *3 0D5& Q0» 1.402W0.01S a 022 041 OKoo^ 1 MC DQOB0 0120200 30 &1D0Q&0 09001328E0.300 0 925 A2A E10咖0 310dia7VT e OJOO■■eA D.3H)■*tB Q4P0 10 16 L 0 IU a iso 2923J1 PINSMCHES MJJME1TER3-MN NUM MNI MAXa 0 3430 w BM 891 0140^3513-6719-43 ET lir o.-«Q -B51: 911&.43 010MBS 0i1522 4B 23.24 020 101S104535742454□24 1 14H2B52S DE37 13。
MAX6314US42D3+中文资料
General DescriptionThe MAX6314 low-power CMOS microprocessor (µP)supervisory circuit is designed to monitor power supplies in µP and digital systems. The MAX6314’s RESET output is bidirectional, allowing it to be directly connected to µPs with bidirectional reset inputs, such as the 68HC11. It provides excellent circuit reliability and low cost by eliminating external components and adjustments. The MAX6314 also provides a debounced manual reset input.This device performs a single function: it asserts a reset signal whenever the V CC supply voltage falls below a preset threshold or whenever manual reset is asserted.Reset remains asserted for an internally programmed interval (reset timeout period) after V CC has risen above the reset threshold or manual reset is deasserted.The MAX6314 comes with factory-trimmed reset threshold voltages in 100mV increments from 2.5V to 5V. Preset timeout periods of 1ms, 20ms, 140ms,and 1120ms (minimum) are also available. The device comes in a SOT143 package.F or a µP supervisor with an open-drain reset pin, see the MAX6315 data sheet.________________________ApplicationsComputers ControllersIntelligent InstrumentsCritical µP and µC Power Monitoring Portable/Battery-Powered EquipmentFeatures♦Small SOT143 Package♦RESET Output Simplifies Interface to Bidirectional Reset I/Os♦Precision Factory-Set V CC Reset Thresholds:100mV Increments from 2.5V to 5V♦±1.8% Reset Threshold Accuracy at T A = +25°C ♦±2.5% Reset Threshold Accuracy Over Temp.♦Four Reset Timeout Periods Available: 1ms, 20ms, 140ms, or 1120ms (minimum) ♦Immune to Short V CC Transients ♦5µA Supply Current♦Pin-Compatible with MAX811MAX6314*68HC11/Bidirectional-CompatibleµP Reset Circuit________________________________________________________________Maxim Integrated Products1Pin ConfigurationTypical Operating Circuit19-1090; Rev 2; 12/05Ordering Information continued at end of data sheet.*Patents PendingFor pricing, delivery, and ordering information,please contact Maxim/Dallas Direct!at 1-888-629-4642, or visit Maxim’s website at .Ordering Information†The MAX6314 is available in a SOT143 package, -40°C to+85°C temperature range.††The first two letters in the package top mark identify the part,while the remaining two letters are the lot tracking code.Devices are available in both leaded and lead-free packaging.Specify lead-free by replacing “-T” with “+T” when ordering.M A X 631468HC11/Bidirectional-Compatible µP Reset Circuit 2_______________________________________________________________________________________ABSOLUTE MAXIMUM RATINGSELECTRICAL CHARACTERISTICS(V CC = +2.5V to +5.5V, T A = -40°C to +85°C, unless otherwise noted. Typical values are at T A = +25°C.)Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.Note 1:The MAX6314 monitors V CC through an internal, factory-trimmed voltage divider that programs the nominal reset threshold.Factory-trimmed reset thresholds are available in 100mV increments from 2.5V to 5V (see Ordering and Marking Information ).Note 2:This is the minimum time RESET must be held low by an external pull-down source to set the active pull-up flip-flop.Note 3:Measured from RESET V OL to (0.8 x V CC ), R LOAD = ∞.V CC ........................................................................-0.3V to +6.0V All Other Pins..............................................-0.3V to (V CC + 0.3V)Input Current (V CC ).............................................................20mA Output Current (RESET )......................................................20mA Rate of Rise (V CC )...........................................................100V/µsContinuous Power Dissipation (T A = +70°C)SOT143 (derate 4mW/°C above +70°C).......................320mW Operating Temperature Range ...........................-40°C to +85°C Storage Temperature Range.............................-65°C to +160°C Lead Temperature (soldering, 10sec).............................+300°CMAX631468HC11/Bidirectional-CompatibleµP Reset Circuit_______________________________________________________________________________________3__________________________________________Typical Operating Characteristics(T A = +25°C, unless otherwise noted.)4.7k Ω PULL-UP 2V/divMAX6314 PULL-UP 2V/divINPUT 5V/div200ns/divPULLUP CHARACTERISTICS100pF4.7k Ω+5V74HC0574HC05V CCGNDMR 100pF+5VRESETMAX63146-50-303090SUPPLY CURRENT vs. TEMPERATURE215TEMPERATURE (°C)S U P P L Y C U R R E N T (µA )-101050347060135SUPPLY CURRENT vs. SUPPLY VOLTAGE215SUPPLY VOLTAGE (V)S U P P L Y C U R R E N T (µA )2344500-50-301090POWER-DOWN RESET DELAYvs. TEMPERATURE1040TEMPERATURE (°C)P O W E R -D O W N R E S E T D E L A Y (µs )-1020303050701.040.96-50-301090NORMALIZED RESET TIMEOUT PERIOD vs. TEMPERATURE (V CC RISING)0.970.981.021.001.03M A X 6314-05TEMPERATURE (°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 D -100.991.013050701.0060.994-50-301090NORMALIZED RESET THRESHOLD vs. TEMPERATURE (V CC FALLING)0.9960.9981.0041.000M A X 6314-06TEMPERATURE (°C)N O R M A L I Z E D R E S E T T H R E S H O L D-101.0023050701000101001000MAXIMUM TRANSIENT DURATION vs. RESET COMPARATOR OVERDRIVE20RESET COMP. 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 )4060806000-50-301090RESET PULLUP TIME vs. TEMPERATURE100200500300TEMPERATURE (°C)R E S E T P U L L -U P -T I M E (n s )-10400305070Figure 1. Functional Diagram M A X 631468HC11/Bidirectional-Compatible µP Reset Circuit 4_____________________________________________________________________________________________________________________________________________________Pin DescriptionSupply Voltage and Reset Threshold Monitor InputV CC4Manual Reset Input. A logic low on MR asserts reset. Reset remains asserted as long as MR is low, and for the reset timeout period (t RP ) after the reset conditions are terminated. Connect to V CC if not used.MR 3PIN Active-Low Complementary Output. In addition to the normal n-channel pulldown, RESET has a p-channel pullup transistor in parallel with a 4.7k Ωresistor to facilitate connection to µPs with bidirectional resets. See the Reset Output section.RESET2GroundGND 1FUNCTIONNAMEMAX631468HC11/Bidirectional-CompatibleµP Reset Circuit_______________________________________________________________________________________5Detailed DescriptionThe MAX6314 has a reset output consisting of a 4.7k Ωpull-up resistor in parallel with a P-channel transistor and an N-channel pull down (Figure 1), allowing this IC to directly interface with microprocessors (µPs) that have bidirectional reset pins (see the Reset Output section).Reset OutputA µP’s reset input starts the µP in a known state. The MAX6314 asserts reset to prevent code-execution errors during power-up, power-down, or brownout conditions. RESET is guaranteed to be a logic low for V CC > 1V (see the Electrical Characteristics table).Once V CC exceeds the reset threshold, the internal timer keeps reset asserted for the reset timeout period (t RP ); after this interval RESET goes high. If a brownout condition occurs (monitored voltage dips below its pro-grammed reset threshold), RESET goes low. Any time V CC dips below the reset threshold, the internal timer resets to zero and RESET goes low. The internal timer starts when V CC returns above the reset threshold, and RESET remains low for the reset timeout period.The MAX6314’s RESET output is designed to interface with µPs that have bidirectional reset pins, such as the Motorola 68HC11. Like an open-drain output, the MAX6314 allows the µP or other devices to pull RESET low and assert a reset condition. However, unlike a standard open-drain output, it includes the commonly specified 4.7k Ωpullup resistor with a P-channel active pullup in parallel.This configuration allows the MAX6314 to solve a prob-lem associated with µPs that have bidirectional reset pins in systems where several devices connect to RESET . These µPs can often determine if a reset was asserted by an external device (i.e., the supervisor IC)or by the µP itself (due to a watchdog fault, clock error,or other source), and then jump to a vector appropriate for the source of the reset. However, if the µP does assert reset, it does not retain the information, but must determine the cause after the reset has occurred.The following procedure describes how this is done with the Motorola 68HC11. In all cases of reset, the µP pulls RESET low for about four E-clock cycles. It then releases RESET , waits for two E-clock cycles, then checks RESET ’s state. If RESET is still low, the µP con-cludes that the source of the reset was external and,when RESET eventually reaches the high state, jumps to the normal reset vector. In this case, stored state information is erased and processing begins fromscratch. If, on the other hand, RESET is high after the two E-clock cycle delay, the processor knows that it caused the reset itself and can jump to a different vec-tor and use stored state information to determine what caused the reset.The problem occurs with faster µPs; two E-clock cycles is only 500ns at 4MHz. When there are several devices on the reset line, the input capacitance and stray capacitance can prevent RESET from reaching the logic-high state (0.8 x V CC ) in the allowed time if only a passive pullup resistor is used. In this case, all resets will be interpreted as external. The µP is guaranteed to sink only 1.6mA, so the rise time cannot be much reduced by decreasing the recommended 4.7k Ωpullup resistance.The MAX6314 solves this problem by including a pullup transistor in parallel with the recommended 4.7k Ωresis-tor (Figure 1). The pullup resistor holds the output high until RESET is forced low by the µP reset I/O, or by the MAX6314 itself. Once RESET goes below 0.5V, a com-parator sets the transition edge flip-flop, indicating that the next transition for RESET will be low to high. As soon as RESET is released, the 4.7k Ωresistor pulls RESET up toward V CC . When RESET rises above 0.5V,the active p-channel pullup turns on for the 2µs duration of the one-shot. The parallel combination of the 4.7k Ωpullup and the p-channel transistor on-resistance quickly charges stray capacitance on the reset line, allowing RESET to transition low to high with-in the required two E-clock period, even with several devices on the reset line (Figure 2). Once the one-shot times out, the p-channel transistor turns off. This process occurs regardless of whether the reset was caused by V CC dipping below the reset threshold, MR being asserted, or the µP or other device asserting RESET . Because the MAX6314 includes the standard 4.7k Ωpullup resistor, no external pullup resistor is required. To minimize current consumption, the internal pullup resistor is disconnected whenever the MAX6314asserts RESET .Manual Reset InputMany 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 after MR returns high. To minimize current consumption, the internal 4.7k Ωpullup resistor on RESET is disconnected whenever RESET is asserted.M A X 631468HC11/Bidirectional-Compatible µP Reset Circuit 6_______________________________________________________________________________________MR has an internal 63k Ωpullup resistor, so it can be left open if not used. Connect a normally open momen-tary switch from MR to GND 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 environment, connecting a 0.1µF capacitor from MR to ground provides additional noise immunity.__________Applications InformationNegative-Going V CC TransientsIn addition to issuing a reset to the µP during power-up,power-down, and brownout conditions, these devices are relatively immune to short-duration negative-going transients (glitches). The T ypical Operating Character-istics show the Maximum Transient Duration vs. Reset Threshold Overdrive, for which reset pulses are not generated. The graph was produced using negative-going pulses, starting at V RST max and ending below the programmed reset threshold by the magnitude indicated (reset threshold overdrive). The graph shows the maximum pulse width that a negative-going V CC transient may typically have without causing a reset pulse to be issued. As the amplitude of the transient increases (i.e., goes farther below the reset threshold),the maximum allowable pulse width decreases. A 0.1µF bypass capacitor mounted close to V CC provides addi-tional transient immunity.Ensuring a Valid RESET OutputDown to V CC = 0VWhen V CC falls below 1V, RESET no longer sinks current—it becomes an open circuit. Therefore, high-impedance CMOS-logic inputs connected to RESET can drift to undetermined voltages. This presents no problem in most applications, since most µP and other circuitry is inoperative with V CC below 1V. However, in applications where RESET must be valid down to V CC = 0V, adding a pull-down resistor to RESET will cause any stray leakage currents to flow to ground,holding RESET low (Figure 3). R1’s value is not critical;100k Ωis large enough not to load RESET and small enough to pull RESET to ground.Figure 2. MAX6314 Supports Additional Devices on the Reset BusFigure 3. RESET Valid to V CC = Ground CircuitMAX631468HC11/Bidirectional-CompatibleµP Reset Circuit_______________________________________________________________________________________7Figure 4. RESET Timing Diagram†The MAX6314 is available in a SOT143 package, -40°C to +85°C temperature range.††The first two letters in the package top mark identify the part, while the remaining two letters are the lot tracking code.†††Sample stocks generally held on the bolded products; also, the bolded products have 2,500 piece minimum-order quantities.Non-bolded products have 10,000 piece minimum-order quantities. Contact factory for details.Devices are available in both leaded and lead-free packaging. Specify lead-free by replacing “-T” with “+T” when ordering.Note:All devices available in tape-and-reel only. Contact factory for availability.___________________________________________Ordering Information (continued)M A X 631468HC11/Bidirectional-Compatible µP Reset Circuit 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.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._____________________________Ordering and Marking Information (continued)†The MAX6314 is available in a SOT143 package, -40°C to +85°C temperature range.††The first two letters in the package top mark identify the part, while the remaining two letters are the lot tracking code.†††Sample stocks generally held on the bolded products; also, the bolded products have 2,500 piece minimum-order quantities.Non-bolded products have 10,000 piece minimum-order quantities. Contact factory for details.Devices are available in both leaded and lead-free packaging. Specify lead-free by replacing “-T” with “+T” when ordering.Note:All devices available in tape-and-reel only. Contact factory for availability.Chip InformationTRANSISTOR COUNT: 519Package InformationFor the latest package outline information, go to /packages .。
MAX4373FESA中文资料
MAX4373/MAX4374/MAX4375
Ordering Information
PART MAX4373TEUA MAX4373TESA MAX4373FEUA MAX4373FESA MAX4373HEUA MAX4373HESA TEMP RANGE -40°C to +85°C -40°C to +85°C -40°C to +85°C -40°C to +85°C -40°C to +85°C -40°C to +85°C PINPACKAGE 8 µMAX 8 SO 8 µMAX 8 SO 8 µMAX 8 SO GAIN (V/V) +20 +20 +50 +50 +100 +100
Features
♦ Current-Sense Amplifier plus Internal Comparator and Bandgap Reference with Improved Accuracy ♦ 50µA Supply Current ♦ Single +2.7V to +28V Operating Supply ♦ 1mV (max) Input Offset Voltage ♦ 2% (max) Full-Scale Accuracy ♦ Internal Bandgap Reference (±1.6% Accuracy) ♦ Latching Comparator Output ♦ Three Gain Versions Available (+20V/V, +50V/V, +100V/V) ♦ Wide 0 to +28V Common-Mode Range, Independent of Supply Voltage
PT6314中文资料
100
90
Vin
80
9.0V
12.0V
70
15.0V
20.0V
26.0V
60
50
40
0
0.5
1
1.5
2
2.5
3
Iout-(Amps)
Efficiency - %
Efficiency vs Output Current
100
90
80
70
60
50
40
0
0.5
1
1.5
2
2.5
3
Iout-(Amps)
Vin
2
2.5
3
Iout-(Amps)
Iout-(Amps)
Thermal Derating (Ta)
3
2.5
(See Note B)
60°C 70°C
2
85°C
1.5
1
0.5
0
9
11 13 15 17 19 21 23 25 27
Vin-(Volts)
Iout-(Amps)
Thermal Derating (Ta)
元器件交易网
PT6300 Series
3 Amp Adjustable Positive Step-down Integrated Sw itching Regulators
SLTS031B
(Revised 9/30/2000)
• 90% Efficiency • Adjustable Output Voltage • Internal Short Circuit Protection • Over-Temperature Protection • On/Off Control (Ground Off) • Small SIP Footprint • Wide Input Range
MAX6314US29D2+T 微处理器监控电源供应电路说明书
RELIABILITY REPORTFORMAX6314US29D2+TPLASTIC ENCAPSULATED DEVICESOctober 11, 2010MAXIM INTEGRATED PRODUCTS120 SAN GABRIEL DR.SUNNYVALE, CA 94086Approved byDon LippsQuality AssuranceManager, Reliability EngineeringConclusionThe MAX6314US29D2+T successfully meets the quality and reliability standards required of all Maxim products. In addition, Maxim"s continuous reliability monitoring program ensures that all outgoing product will continue to meet Maxim"s quality and reliability standards.Table of ContentsI. ........Device Description V. ........Quality Assurance InformationII. ........Manufacturing Information VI. .......Reliability EvaluationIII. .......Packaging Information IV. .......Die Information.....AttachmentsI. Device DescriptionA. GeneralThe MAX6314 low-power CMOS microprocessor (µP) supervisory circuit is designed to monitor power supplies in µP and digital systems. TheMAX6314's active-low RESET output is bidirectional, allowing it to be directly connected to µPs with bidirectional reset inputs, such as the 68HC11. It provides excellent circuit reliability and low cost by eliminating external components and adjustments. The MAX6314 also provides a debounced manual reset input. This device performs a single function: it asserts a reset signal whenever the VCC supply voltage falls below a preset threshold or whenever manual reset is asserted. Reset remains asserted for an internally programmed interval (reset timeout period) after VCC has risen above the reset threshold or manual reset is deasserted. The MAX6314 comes with factory-trimmed reset threshold voltages in 100mV increments from2.5V to 5V. Preset timeout periods of 1ms, 20ms, 140ms, and 1120ms (minimum) are also available. The device comes in a SOT143 package. For a µP supervisor with an open-drain reset pin, see the MAX6315 data sheet.A. Description/Function: 68HC11/Bidirectional-Compatible µP Reset CircuitB. Process: B12C. Number of Device Transistors:D. Fabrication Location: Oregon or TexasE. Assembly Location: Malaysia, ThailandF. Date of Initial Production: Pre 1997III. Packaging InformationA. Package Type: 4-pin SOTB. Lead Frame: Alloy42C. Lead Finish: 100% matte TinD. Die Attach: ConductiveE. Bondwire: Au (1 mil dia.)F. Mold Material: Epoxy with silica fillerG. Assembly Diagram: #05-1601-0015H. Flammability Rating: Class UL94-V0Level 1I. Classification of Moisture Sensitivity perJEDEC standard J-STD-020-CJ. Single Layer Theta Jb: 250*°C/WK. Single Layer Theta Jc: 130°C/WL. Multi Layer Theta Ja: N/AM. Multi Layer Theta Jc: N/AIV. Die InformationA. Dimensions: 40 X 31 milsB. Passivation: Si3N4/SiO2 (Silicon nitride/ Silicon dioxide)C. Interconnect: Al/0.5%Cu with Ti/TiN BarrierD. Backside Metallization: NoneE. Minimum Metal Width: 1.2 microns (as drawn)F. Minimum Metal Spacing: 1.2 microns (as drawn)G. Bondpad Dimensions: 5 mil. Sq.H. Isolation Dielectric: SiO2I. Die Separation Method: Wafer Saw= 1= 1.83 (Chi square value for MTTF upper limit) MTTF 192 x 4340 x 443 x 2 (where 4340 = Temperature Acceleration factor assuming an activation energy of 0.8eV) A. Quality Assurance Contacts:Don Lipps (Manager, Reliability Engineering) Bryan Preeshl (Vice President of QA)B. Outgoing Inspection Level: 0.1% for all electrical parameters guaranteed by the Datasheet.0.1% For all Visual Defects.C. Observed Outgoing Defect Rate: < 50 ppmD. Sampling Plan:Mil-Std-105DVI. Reliability EvaluationA. Accelerated Life Test The results of the 135°C biased (static) life test are shown in Table 1. Using these results, the Failure Rate ( ) is calculated as follows:= 2.5 x 10-9= 2.5 F.I.T. (60% confidence level @ 25°C)The following failure rate represents data collected from Maxim"s reliability monitor program. Maxim performs quarterly life test monitors on its processes. This data is published in the Reliability Report found at /qa/reliability/monitor. ***********************************************************************@55C(0.8eV,60%UCL)B. E.S.D. and Latch-Up Testing (lot BNMAAA004GZ, D/C 9801)The MS11 die type has been found to have all pins able to withstand a HBM transient pulse of +/-2000V per Mil-Std 883 Method 3015.7. Latch-Up testing has shown that this device withstands a current of +/-250mA and overvoltage per JEDEC JESD78.Table 1Reliability Evaluation Test Results MAX6314US29D2+TTEST ITEM TEST CONDITION FAILUREIDENTIFICATION SAMPLE SIZE NUMBER OF COMMENTSFAILURESStatic Life Test (Note 1)Ta = 135°C BiasedTime = 192 hrs. DC Parameters& functionality49 0SNMBGQ001D,DC034580 0 INMBEQ001CQ, DC 991480 0NNMBDX001F,DC974177 0BNMBAB007K,DC970480 0BNMBAO001B,DC962377 0BNMAAB006L,DC9704Note 1: Life Test Data may represent plastic DIP qualification lots.。
max3485中文资料
MAX3483, MAX3485, MAX3486, MAX3488, MAX3490以及MAX3491是用于RS-485与RS-422通信的3.3V，低功耗收发器，每个器件中都具有一个驱动器和一个接收器。
MAX3483和MAX3488具有限摆率驱动器，可以减小EMI，并降低由不恰当的终端匹配电缆引起的反射，实现最高250kbps的无差错数据传输。
MAX3486的驱动器摆率部分受限，可以实现最高2.5Mbps的传输速率。
MAX3485,MAX3490和MAX3491则可以实现最高10Mbps 的传输速率。
驱动器具有短路电流限制，并可以通过热关断电路将驱动器输出置为高阻状态，防止过度的功率损耗。
接收器输入具有失效保护特性，当输入开路时，可以确保逻辑高电平输出。
使用MAX3488, MAX3490和MAX3491可以实现全双工通信，而MAX3483，MAX3485与MAX3486则为半双工应用设计。
这篇文章介绍的就是MAX34852 芯片介绍2.1 主要特点半双工速率：10Mbps限摆率：NO接收允许控制：YES 关断电流：2 nA引脚数：82.2 引脚配置根据上图、上表可知：DE和RO为使能管脚。
DE为低电平、RE为低电平时为接收；DE 为高电平、RE为高电平时为发送；RO和DI为数据管脚。
RO为接收，DI为发送；因此我们经常将DE和RE直接连接，用一个IO口控制（见3.2 电路实现）。
3.1 应用场景工业控制局域网集成服务数字网络低功耗RS-485/RS-422收发器（我做的几个项目都是该功能）分组交换技术电信用于EMI敏感应用的收发器3.2 电路实现485是2线式，两个485接口的设备相连通过A、B两根线即可（也就是至少2个485芯片），连接方式如下图所示：我们使用MAX3485一般是用下图电路：从上图中我们可以看到：RO直接和TTL电平的UART_RX（或模拟串口的RX）相连，DI直接和TTL电平的UART_TX（或模拟串口的TX）相连，R34为1K。
MAX6309UK41D4-T中文资料
General DescriptionThe MAX6305–MAX6313 CMOS microprocessor (µP)supervisory circuits are designed to monitor more than one power supply. Ideal for monitoring both 5V and 3.3V in personal computer systems, these devices assert a system reset if any of the monitored supplies falls outside the programmed threshold. Low supply current (15µA) and a small package suit them for portable applications. The MAX6305–MAX6313 are specifically designed to ignore fast transients on any monitored supply.These devices are available in a SOT23-5 package,have factory-programmed reset thresholds from 2.5V to 5.0V (in 100mV increments), and feature four power-on reset timeout periods. Ten standard versions are avail-able. Contact the factory for availability of non standard versions.ApplicationsPortable Computers Computers ControllersIntelligent InstrumentsPortable/Battery-Powered Equipment Multivoltage Systems: 3V/5V, 5V/12V, 5V/24V Embedded Control SystemsFeatureso Small 5-Pin SOT23 Packageo Precision Factory-Set V CC Reset Thresholds;Available in 0.1V Increments from 2.5V to 5V o Immune to Short V CC Transientso Guaranteed RESET Valid to V CC = 1V o Guaranteed Over Temperature o 8µA Supply Currento Factory-Set Reset Timeout Delay from 1ms (min) to 1120ms (min)o No External Components o Manual Reset Inputo Under/Overvoltage Supply MonitoringMAX6305–MAX63135-Pin, Multiple-Input,Programmable Reset ICs________________________________________________________________Maxim Integrated Products119-1145; Rev 5; 4/08†The MAX6306/MAX6307/MAX6309/MAX6310/MAX6312/MAX6313 are available with factory-set V CC reset thresholds from 2.5V to 5V, in 0.1V increments. Insert the desired nominal reset threshold (from Table 1) into the blanks following the letters UK.All parts also offer factory-programmed reset timeout periods.Insert the number corresponding to the desired nominal timeout period index following the “D” in the part number (D1 = 1ms min,D2 = 20ms min, D3 = 140ms min, and D4 = 1120ms min). There are 10 standard versions with a required order increment of 2,500pieces. Sample stock is generally held on the standard versions only (see Standard Versions table). Required order increment is 10,000 pieces for non-standard versions. Contact factory for availability of non-standard versions. All devices available in tape-and-reel only.Devices are available in both leaded and lead-free packaging.Specify lead-free by replacing “-T” with “+T” when ordering.Pin Configurations and Typical Operating Circuit appear atend of data sheet.Ordering Information continued at end of data sheet.Standard Versions Table appears at end of data sheet._______________________________________________________________Selector TableFor pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,or visit Maxim’s website at .M A X 6305–M A X 63135-Pin, Multiple-Input, Programmable Reset ICsABSOLUTE MAXIMUM RATINGSELECTRICAL CHARACTERISTICSV CC = +2.5V to +5.5V for the MAX6305/MAX6308/MAX6311, V CC = (V TH + 2.5%) to +5.5V for the MAX6306/MAX6307/MAX6309/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 ...........................................................................-0.3V to +6V All Other Pins..............................................-0.3V to (V CC + 0.3V)Input/Output Current, All Pins.............................................20mA Rate of Rise, V CC ............................................................100V/µs Continuous Power Dissipation (T A = +70°C)SOT23-5 (derate 7.1mW/°C above +70°C).................571mWOperating Temperature RangeMAX63_ _UK _ _D_-T.........................................0°C to +70°C MAX63_ _EUK _ _D_-T...................................-40°C to +85°C Storage Temperature Range.............................-65°C to +160°C Lead Temperature (soldering, 10sec).............................+300°CMAX6305–MAX63135-Pin, Multiple-Input, Programmable Reset ICs_______________________________________________________________________________________3ELECTRICAL CHARACTERISTICS (continued)V CC = +2.5V to +5.5V for the MAX6305/MAX6308/MAX6311, V CC = (V TH + 2.5%) to +5.5V for the MAX6306/MAX6307/MAX6309/Note 2: The MAX6305/MAX6308/MAX6311 switch from undervoltage reset to normal operation between 1.5V < V CC < 2.5V.Note 3: The MAX6306/MAX6307/MAX6309/MAX6310/MAX6312/MAX6313 monitor V CC through an internal factory-trimmed voltagedivider, which programs the nominal reset threshold. Factory-trimmed reset thresholds are available in approximately 100mV increments from 2.5V to 5V (Table 1).Note 4:Guaranteed by design.M A X 6305–M A X 63135-Pin, Multiple-Input, Programmable Reset ICs 4_________________________________________________________________________________________________________________________________Typical Operating Characteristics(V CC = +5V, T A = +25°C, unless otherwise noted.)5.05.56.06.57.07.58.08.59.09.5-60-40-2020406080100SUPPLY CURRENT vs. TEMPERATURETEMPERATURE (°C)S U P P L Y C U R R E N T (μA )01020304050607080-60-40-2020406080100V CC FALLING PROPAGATION DELAYvs. TEMPERATURETEMPERATURE (°C)P R O P A G A T I O N D E L A Y (n s )010203040506070-60-40-20020406080100OVRST IN RISING PROPAGATION DELAY vs. TEMPERATURE (OVERVOLTAGE RESET INPUT)TEMPERATURE (°C)P R O P A G A T I O N D E L A Y (n s )020406080100120-60-40-2020406080100RST IN_ FALLING PROPAGATION DELAY vs. TEMPERATURETEMPERATURE (°C)R S T I N _ P R O P A G A T I O N D E L A Y (n s )104001200800MAXIMUM TRANSIENT DURATION vs.VCC RESET THRESHOLD OVERDRIVE10OVERDRIVE, V TH - V CC (mV)T R A N S I E N T D U R A T I O N (μs )100100010,0000.900.920.940.960.981.001.021.041.061.081.10-60-40-20020406080100RESET TIMEOUT vs. TEMPERATURE6305 T O C 05TEMPERATURE (°C)N O R M A L I Z E D R E S E T T I M E O U T0.9900.9920.9940.9960.9981.0001.0021.0041.0061.0081.010-60-40-2020406080100RESET THRESHOLD vs. TEMPERATURE6305 T O C 06TEMPERATURE (°C)N O R M A L I Z E D R E S E T T H R E S H O L D (V /V )104001200800MAXIMUM TRANSIENT DURATION vs.OVRST IN THRESHOLD OVERDRIVE10OVERDRIVE, V OVRST IN - V REF (mV)T R A N S I E N T D U R A T I O N (μs )100100010,000104001200800MAXIMUM TRANSIENT DURATION vs.RST IN_ THRESHOLD OVERDRIVE10OVERDRIVE, V REF - V RST IN (mV)T R A N S I E N T D U R A T I O N (μs )100100010,000_______________Detailed DescriptionThe MAX6305–MAX6313 CMOS microprocessor (µP)supervisory circuits are designed to monitor more than one power supply and issue a system reset when any monitored supply falls out of regulation. The MAX6305/MAX6308/MAX6311 have two adjustable undervoltage reset inputs (RST IN1 and RST IN2). The MAX6306/MAX6307/MAX6309/MAX6310/MAX6312/MAX6313 mon-itor V CC through an internal, factory-trimmed voltage divider. The MAX6306/MAX6309/MAX6312 have, in addition, an adjustable undervoltage reset input and a manual-reset input. The internal voltage divider sets the reset threshold as specified in the device part number (Table 1). The MAX6307/MAX6310/ MAX6313 feature an adjustable undervoltage reset input (RST IN) and an adjustable overvoltage reset input (OVRST IN) in addition to the factory-trimmed reset threshold on the V CC moni-tor. Program the adjustable reset inputs with an external resistor divider (see Adjustable Reset Inputs section).Reset OutputsA µP’s 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 (MAX6305–MAX6310) and RESET (MAX6311/MAX6312/MAX6313) are guaranteed to be asserted at a valid logic level for V CC > 1V (see Electrical Characteristics ). Once all monitored voltages exceed their programmed reset thresholds, an internal timer keeps reset asserted for the reset timeout period (t RP );after this interval, reset deasserts.If a brownout condition occurs (any or all monitored volt-ages dip outside their programmed reset threshold),reset asserts (RESET goes high; RESET goes low). Any time any of the monitored voltages dip below their reset threshold, the internal timer resets to zero and reset asserts. The internal timer starts when all of the moni-tored voltages return above their reset thresholds, and reset remains asserted for a reset timeout period. The MAX6305/MAX6306/MAX6307 feature an active-low,MAX6305–MAX63135-Pin, Multiple-Input, Programmable Reset ICs_______________________________________________________________________________________5______________________________________________________________Pin DescriptionM A X 6305–M A X 6313open-drain, N-channel output. The MAX6308/MAX6309/MAX6310 feature an active-low, complementary output structure that both sinks and sources current, and the MAX6311/MAX6312/MAX6313 have an active-high com-plementary reset output.The MAX6305/MAX6308/MAX6311 switch from under-voltage lockout operation to normal operation between 1.5V < V CC < 2.5V. Below 1.5V, V CC undervoltage-lockout mode asserts RESET . Above 2.5V, V CC normal-operation mode asserts reset if RST IN_ falls below the RST IN_ threshold.Manual-Reset Input(MAX6306/MAX6309/MAX6312)Many µP-based products require manual-reset capability,allowing an operator or external logic circuitry to initiate a reset. A logic low on MR asserts reset. Reset remains asserted while MR is low, and for a reset active timeout period (t RP ) after MR returns high. This input has an inter-nal 63.5k Ωpull-up resistor, so it can be left open if it is not used. MR can be driven with TTL-logic levels in 5V sys-tems, with CMOS-logic levels in 3V systems, or with open-drain/collector output devices. Connect a normally open momentary switch from MR to GND 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 environment, connecting a 0.1µF capacitor from MR to ground provides additional noise immunity.The MR pin has internal ESD-protection circuitry that may be forward biased under certain conditions, drawing excessive current. For example, assume the circuitry driv-ing MR uses a +5V supply other than V CC . If V CC drops or browns out lower than +4.7V, MR ’s absolute maximum rat-ing is violated (-0.3V to (V CC + 0.3V)), and undesirable current flows through the ESD structure from MR to V CC .To avoid this, it is recommended that the supply for the MR pin be the same as the supply monitored by V CC . In this way, the voltage at MR will not exceed V CC .Adjustable Reset InputsThe MAX6305–MAX6313 each have one or more reset inputs (RST IN_ /OVRST IN). These inputs are com-pared to the internal reference voltage (F igure 1).Connect a resistor voltage divider to RST IN_ such that V RST IN_falls below V RSTH (1.23V) when the monitored voltage (V IN ) falls below the desired reset threshold (V TH ) (F igure 2). Calculate the desired reset voltage with the following formula:R1 + R2V TH = ________x VRSTHR25-Pin, Multiple-Input, Programmable Reset ICs 6_______________________________________________________________________________________Figure 1. Functional DiagramMAX6305–MAX63135-Pin, Multiple-Input, Programmable Reset ICs_______________________________________________________________________________________7The ±25nA max input leakage current allows resistors on the order of megohms. Choose the pull-up resistor in the divider to minimize the error due to the input leakage cur-rent. The error term in the calculated threshold is simply:±25nA x R1If you choose R1 to be 1M Ω, the resulting error is ±25 x 10-9x 1 x 106= ±25mV.Like the V CC voltage monitors on the MAX6306/MAX6307/MAX6309/MAX6310/MAX6312/MAX6313, the RST IN_inputs (when used with a voltage divider) are designed to ignore fast voltage transients. Increase the noise immunity by connecting a capacitor on the order of 0.1µF between RST IN and GND (Figure 2). This creates a single-pole lowpass filter with a corner frequency given by:f = (1/2π) / (R1 + R2)(R1 x R2 x C)For example, if R1 = 1M Ωand R2 = 1.6M Ω, adding a 0.1µF capacitor from RST IN_ to ground results in a lowpass corner frequency of f = 2.59Hz. Note that adding capacitance to RST IN slows the circuit’s overall response time.__________Applications InformationInterfacing to µPs with Bidirectional Reset PinsSince the RESET output on the MAX6305/MAX6306/MAX6307 is open drain, these devices interface easily with µPs that have bidirectional reset pins, such as the Motorola 68HC11. Connecting the µP supervisor’s RESET output directly to the microcontroller’s RESET pin with a single pull-up resistor allows either device to assert reset (Figure 3).Negative-Going V CC TransientsIn addition to issuing a reset to the µP during power-up,power-down, and brownout conditions, these devices are relatively immune to short-duration, negative-going V CC transients (glitches).The Typical Operating Characteristics show the Maximum Transient Duration vs. V CC Reset Threshold Overdrive, for which reset pulses are not generated.The graph was produced using negative-going pulses,starting at V TH max, and ending below the pro-grammed reset threshold by the magnitude indicated (reset threshold overdrive). The graph shows the maxi-mum pulse width that a negative-going V CC transient may typically have without causing a reset pulse to be issued. As the amplitude of the transient increases (i.e.,goes farther below the reset threshold), the maximum allowable pulse width decreases.RST IN_/OVRST IN are also immune to negative/positive-going transients (see Typical Operating Characteristics ).A 0.1µF bypass capacitor mounted close to the RST IN_,OVRST IN, and/or the V CC pin provides additional tran-sient immunity.Ensuring a Valid RESET /RESETOutput Down to V CC = 0VWhen V CC falls below 1V, push/pull structured RESET /RESET current sinking (or sourcing) capabilities decrease drastically. High-impedance CMOS-logic inputs connected to RESET can drift to undetermined voltages. This presents no problem in most applica-tions, since most µPs and other circuitry do not operate with V CC below 1V. In those applications where RESET must be valid down to 0V, adding a pull-down resistor between RESET and ground sinks any stray leakageFigure 2. Increasing Noise ImmunityFigure 3. Interfacing to µPs with Bidirectional Reset I/Ocurrents, holding RESET low (Figure 4). The pull-down resistor’s value is not critical; 100k Ωis large enough not to load RESET and small enough to pull RESET to ground. For applications where RESET must be valid to V CC , a 100k Ωpull-up resistor between RESET and V CC will hold RESET high when V CC falls below 1V (Figure 5).Since the MAX6305/MAX6306/MAX6307 have open-drain, active-low outputs, they typically use a pull-up resistor. With these devices and under these conditions (V CC < 1V), RESET will most likely not maintain an active condition, but will drift toward a nonactive level due to the pull-up resistor and the RESET output’s reduction in sinking capability. These devices are not recommended for applications that require a valid RESET output below 1V.* Factory-trimmed reset thresholds are available in approximately 100mV increments with a ±1.5% room-temperature variance.M A X 6305–M A X 63135-Pin, Multiple-Input, Programmable Reset ICs 8_______________________________________________________________________________________Figure 4. Ensuring RESET Valid to V CC = 0VFigure 5. Ensuring RESET Valid to V CC = 0VTable 1. Factory-Trimmed Reset Thresholds*MAX6305–MAX63135-Pin, Multiple-Input, Programmable Reset ICs_______________________________________________________________________________________9Chip InformationTRANSISTOR COUNT: 800Typical Operating Circuit†The MAX6306/MAX6307/MAX6309/MAX6310/MAX6312/MAX6313 are available with factory-set V CC reset thresholds from 2.5V to 5V, in 0.1V increments. Insert the desired nominal reset threshold (from Table 1) into the blanks following the letters UK.All parts also offer factory-programmed reset timeout periods.Insert the number corresponding to the desired nominal timeout period index following the “D” in the part number (D1 = 1ms min,D2 = 20ms min, D3 = 140ms min, and D4 = 1120ms min). There are 10 standard versions with a required order increment of 2,500pieces. Sample stock is generally held on the standard versions only (see Standard Versions table). Required order increment is 10,000 pieces for non-standard versions. Contact factory for avail-ability of non-standard versions. All devices available in tape-and-reel only.Devices are available in both leaded and lead-free packaging.Specify lead-free by replacing “-T” with “+T” when ordering.M A X 6305–M A X 63135-Pin, Multiple-Input, Programmable Reset ICs 10______________________________________________________________________________________Pin ConfigurationsPackage InformationFor the latest package outline information, go to /packages .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.Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________11©2008 Maxim Integrated Productsis a registered trademark of Maxim Integrated Products, Inc.MAX6305–MAX6313 5-Pin, Multiple-Input, Programmable Reset ICs元器件交易网。
MAX4310中文资料
General Description
The MAX4310–MAX4315 single-supply mux-amps combine high-speed operation, low-glitch switching, and excellent video specifications. The six products in this family are differentiated by the number of multiplexer inputs and the gain configuration. The MAX4310/MAX4311/MAX4312 integrate 2-/4-/8-channel multiplexers, respectively, with an adjustable gain amplifier optimized for unity-gain stability. The MAX4313/MAX4314/MAX4315 integrate 2-/4-/8-channel multiplexers, respectively, with a +2V/V fixed-gain amplifier. All devices have 40ns channel switching time and low 10mVp-p switching transients, making them ideal for video-switching applications. They operate from a single +4V to +10.5V supply, or from dual supplies of ±2V to ±5.25V, and they feature Rail-to-Rail® outputs and an input common-mode voltage range that extends to the negative supply rail.
MAX6336US16D3-T中文资料
For free samples & the latest literature: , or phone 1-800-998-8800.For small orders, phone 1-800-835-8769.General DescriptionThe MAX6335/MAX6336/MAX6337 microprocessor (µP)supervisory circuits monitor the power supplies in 1.8V to 3.3V µP and digital systems. They increase circuit reli-ability and reduce cost by eliminating external compo-nents and adjustments. They also feature a debounced manual-reset input.These devices perform a single function: they assert a reset signal whenever the V CC supply voltage declines below a preset threshold or whenever manual reset is asserted. Reset remains asserted for a preset timeout period after V CC has risen above the reset threshold or after manual reset is deasserted. The only difference among the three devices is their output. The MAX6336(push/pull) and MAX6337 (open-drain) have an active-low RESET output, while the MAX6335 (push/pull) has an active-high RESET output. The MAX6335/MAX6336are guaranteed to be in the correct state for V CC down to 0.7V. The MAX6337 is guaranteed to be in the cor-rect state for V CC down to 1.0V.The reset comparator in these ICs is designed to ignore fast transients on V CC . Reset thresholds are factory-trimmable between 1.6V and 2.5V, in approximately 100mV increments. There are 15 standard versions available (2500 piece minimum-order quantity); contact the factory for availability of nonstandard versions (10,000 piece minimum-order quantity). For space-criti-cal applications, the MAX6335/MAX6336/MAX6337come packaged in a 4-pin SOT143.ApplicationsPentium II™ Computers Computers ControllersIntelligent InstrumentsCritical µP/µC Power Monitoring Portable/Battery-Powered Equipment AutomotiveFeatureso Ultra-Low 0.7V Operating Supply Voltageo Low 3.3µA Supply Currento Precision Monitoring of 1.8V and 2.5V Power-Supply Voltages o Reset Thresholds Available from 1.6V to 2.5V,in Approximately 100mV Increments o Debounced Manual Reset o Fully Specified over Temperatureo Three Power-On Reset Pulse Widths Available (1ms min, 20ms min, 100ms min)o Low Costo Three Available Output Structures: Push/Pull RESET , Push/Pull RESET, Open-Drain RESET o Guaranteed RESET/RESET Valid to V CC = 0.7V (MAX6335/MAX6336)o Power-Supply Transient Immunity o No External Components o 4-Pin SOT143 Packageo Pin-Compatible with MAX811/MAX812 and MAX6314/MAX6315MAX6335/MAX6336/MAX63374-Pin, Ultra-Low-Voltage, Low-Power µP Reset Circuits with Manual Reset________________________________________________________________Maxim Integrated Products 119-1412; Rev 0; 12/98Ordering Information* These devices are available in factory-set V CC reset thresh-olds from 1.6V to 2.5V, in approximately 0.1V increments.Choose the desired reset threshold suffix from Table 1 and insert it in the blanks following “US” in the part number.Factory-programmed reset timeout periods are also available.Insert the number corresponding to the desired nominal reset timeout period (1 = 1ms min, 2 = 20ms min, 3 = 100ms min) in the blank following “D” in the part number. There are 15 stan-dard versions with a required order increment of 2500 pieces.Sample stock is generally held on the standard versions only (see Selector Guide). Contact the factory for availability of non-standard versions (required order increment is 10,000 pieces).All devices available in tape-and-reel only.Typical Operating Circuit and Pin Configuration appear at end of data sheet.Selector Guide appears at end of data sheet.Pentium II is a trademark of Intel Corp.M A X 6335/M A X 6336/M A X 63374-Pin, Ultra-Low-Voltage, Low-Power µP Reset Circuits with Manual Reset 2_______________________________________________________________________________________ABSOLUTE MAXIMUM RATINGSELECTRICAL CHARACTERISTICS(V CC = full range, MR = V CC or unconnected, T A = -40°C to +85°C, unless otherwise noted. Typical values are at T A = +25°C and V CC = 3V, reset not asserted.)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.Terminal Voltage (with respect to GND)V CC ......................................................................-0.3V to +6V Push/Pull RESET or RESET , MR ............-0.3V to (V CC + 0.3V)Open-Drain RESET ..............................................-0.3V to +6V Input Current (V CC ).............................................................20mA Output Current (RESET, RESET ).........................................20mA Rate of Rise, V CC ............................................................100V/µsContinuous Power Dissipation (T A = +70°C)SOT143 (derate 4mW/°C above +70°C).....................320mW Operating Temperature Range ...........................-40°C to +85°C Storage Temperature Range.............................-65°C to +160°C Lead Temperature (soldering, 10sec).............................+300°C4-Pin, Ultra-Low-Voltage, Low-Power µP Reset Circuits with Manual Reset_______________________________________________________________________________________32.02.62.23.03.63.83.43.24.0-602.4-40-202.820406080100SUPPLY CURRENT vs. TEMPERATURETEMPERATURE (°C)I C C (µA )0.9500.9900.9701.0001.0301.0401.0201.0101.050-60-400.980-200.96020406080100NORMALIZED RESET TIMEOUT PERIODvs. TEMPERATURETEMPERATURE (°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 D 020103060705040800.501.001.502.002.503.00OUTPUT VOLTAGE LOW vs. SUPPLY VOLTAGEV CC (V)O U T P U T V O L T A G E L O W (m V )402080601001201401600.5 1.0 1.250.75 1.5 1.75 2.0 2.25 2.5OUTPUT VOLTAGE HIGH vs. SUPPLY VOLTAGEV CC (V)O U T P U T V O L T A G E H I G H (V C C - V O H ) (m V )100100001002004003005006000.1110MAXIMUM TRANSIENT DURATION vs. RESET COMPARATOR OVERDRIVERESET COMPARATOR OVERDRIVE (mV)M A X I M U M T R A N S I E N T D U RA T I O N (µs )1020-20403070605080-600-4020406080100V CC FALLING PROPAGATION DELAYvs. TEMPERATURETEMPERATURE (°C)P R O P A G A T I O N D E L A Y (µs )__________________________________________Typical Operating Characteristics(Reset not asserted, T A = +25°C, unless otherwise noted.)MAX6335/MAX6336/MAX6337M A X 6335/M A X 6336/M A X 63374-Pin, Ultra-Low-Voltage, Low-Power µP Reset Circuits with Manual Reset 4_______________________________________________________________________________________Pin DescriptionApplications InformationManual-Reset InputsMany 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 after MR returns high. MR has an internal 20k Ωpull-up resistor, so it can be left unconnected if not used. Connect a normally open momentary switch from MR to GND to create a manual-reset function; external debounce circuitry is not required.Interfacing to µPs with Bidirectional Reset PinsSince the RESET output on the MAX6337 is open-drain,this device interfaces easily with µPs that have bidirec-tional reset pins, such as the Motorola 68HC11.Connecting the µP supervisor’s RESET output directly to the microcontroller’s (µC’s) RESET pin with a single pull-up resistor allows either device to assert reset (Figure 1).Negative-Going V CC TransientsIn addition to issuing a reset to the µP during power-up,power-down, and brownout conditions, these devices are relatively immune to short-duration, negative-going V CC transients (glitches). The Typical Operating Characteristics show the Maximum Transient Duration vs. Reset Comparator Overdrive graph. The graph shows the maximum pulse width that a negative-going V CC transient may typically have without issuing a resetsignal. As the amplitude of the transient increases, the maximum allowable pulse width decreases.Ensuring a Valid Reset Outputdown to V CC = 0When V CC falls below 1V and approaches the minimum operating voltage of 0.7V, push/pull-structured reset sinking (or sourcing) capabilities decrease drastically.High-impedance CMOS-logic inputs connected to the RESET pin can drift to indeterminate voltages. This does not present a problem in most cases, since most µPs and circuitry do not operate at V CC below 1V. For the MAX6336, where RESET must be valid down to 0,adding a pull-down resistor between RESET and GND removes stray leakage currents, holding RESET lowFigure 1. Interfacing to µPs with Bidirectional Reset Pins4-Pin, Ultra-Low-Voltage, Low-Power µP Reset Circuits with Manual Reset_______________________________________________________________________________________5MAX6335/MAX6336/MAX6337*100mV increments, with a ±1.8% room-temperature variance.Table 1. Factory-Trimmed Reset Thresholds*Figure 2. Ensuring Reset Valid down to V CC = 0(Figure 2a). The pull-down resistor value is not critical;100k Ωis large enough not to load RESET , and small enough to pull it low. For the MAX6335, where RESET must be valid to V CC = 0, a 100k Ωpull-up resistor between RESET and V CC will hold RESET high when V CC falls below 0.7V (Figure 2b).Since the MAX6337 has an open-drain, active-low out-put, it typically uses a pull-up resistor. With this device,RESET will most likely not maintain an active condition,but will drift to a non-active level due to the pull-up resistor and the reduced sinking capability of the open-drain device. Therefore, this device is not recommend-ed for applications where the RESET pin is required to be valid down to V CC = 0.M A X 6335/M A X 6336/M A X 63374-Pin, Ultra-Low-Voltage, Low-Power µP Reset Circuits with Manual Reset 6_______________________________________________________________________________________PARTOUTPUT STAGE NOMINAL V TH (V)MINIMUM RESET TIMEOUT (ms)SOT TOP MARKMAX6335US23D3-T Push/Pull RESET 2.30100KABQ MAX6335US22D3-T Push/Pull RESET 2.20100KAAR MAX6335US20D3-T Push/Pull RESET 2.00100KABP MAX6335US18D3-T Push/Pull RESET 1.80100KAAQ MAX6335US16D3-T Push/Pull RESET 1.60100KAAP MAX6336US23D3-T Push/PullRESET 2.30100KAAW MAX6336US22D3-T Push/Pull RESET 2.20100KAAV MAX6336US20D3-T Push/Pull RESET 2.00100KAAU MAX6336US18D3-T Push/Pull RESET 1.80100KAAT MAX6336US16D3-T Push/Pull RESET 1.60100KAAS MAX6337US23D3-T Open-Drain RESET 2.30100KABS MAX6337US22D3-T Open-Drain RESET 2.20100KAAZ MAX6337US20D3-T Open-Drain RESET 2.00100KABRMAX6337US18D3-T Open-Drain RESET 1.80100KAAY MAX6337US16D3-TOpen-Drain RESET1.60100KAAXSelector Guide (standard versions *)Pin ConfigurationTypical Operating Circuit* Sample stock is generally held on all standard versions.MAX6335/MAX6336/MAX63374-Pin, Ultra-Low-Voltage, Low-Power µP Reset Circuits with Manual Reset_______________________________________________________________________________________7TRANSISTOR COUNT:505Chip InformationPackage InformationM A X 6335/M A X 6336/M A X 63374-Pin, Ultra-Low-Voltage, Low-Power µP Reset Circuits with Manual Reset 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.8_____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600©1998 Maxim Integrated ProductsPrinted USAis a registered trademark of Maxim Integrated Products.NOTES。
MAX31855热电偶芯片的中文翻译
MAX3855冷端补偿热电偶至数字输出转换器概述MAX31855具有冷端补偿，将K、J、N、T或E型热电偶信号转换成数字量(如果使用S和R 型热电偶，请联系工厂)。
器件输出14位带符号数据，通过SPI TM 兼容接口、以只读格式输出。
转换器的温度分辨率为℃，最高温度读数为+1800℃，最低温度读数为-270℃，对于K型热电偶，温度范围为-200℃至+700℃，保持±2℃精度。
对于整个量程范围的精度及其它类型的热电偶，请参考ThermalCharacteristics 规格。
应用工业电器设备HVAC 汽车特性S 冷端补偿S 14位、℃分辨率S 提供K、J、N、T和E型热电偶器件版本(如果使用S和R型热电偶，请联系工厂) (见表1) S 简单的SPI兼容接口(只读)S 检测热电偶对GND或V CC 短路S 检测热电偶开路典型应用电路SPI是Motorola，Inc.的商标。
对于价格，供货及订购信息，请联络Maxim在2，或访问Maxim的网站。
绝对最大额定值范围电源电压范围（VCC和GND）.................. to +所有其他引脚............................................到（V CC+ ）连续功率耗散（T A =+70℃）SO（减免℃以上+70℃）.......................ESD保护（所有引脚，人体模型）.............±2000kV工作温度范围........................-40℃至+125°C连接点温度................................................ .....+150°C存储温度范围..........................-65℃至+150°清除温度（焊接，10秒） (300)焊接温度（回流） (260)强调超出“绝对最大额定值”，即可能对器件造成永久性损坏。
MAX6315US30D3-T中文资料
________________General DescriptionThe MAX6315 low-power CMOS microprocessor (µP)supervisory circuit is designed to monitor power sup-plies in µP and digital systems. It provides excellent cir-cuit reliability and low cost by eliminating external components and adjustments. The MAX6315 also pro-vides a debounced manual reset input.This device performs a single function: it asserts a reset signal whenever the V CC supply voltage falls below a preset threshold or whenever manual reset is asserted.Reset remains asserted for an internally programmed interval (reset timeout period) after V CC has risen above the reset threshold or manual reset is deasserted. The MAX6315’s open-drain RESET output can be pulled up to a voltage higher than V CC .The MAX6315 comes with factory-trimmed reset thresh-old voltages in 100mV increments from 2.5V to 5V.Preset timeout periods of 1ms, 20ms, 140ms, and 1120ms (minimum) are also available. The device comes in a SOT143 package.For microcontrollers (µCs) and µPs with bidirectional reset pins, see the MAX6314 data sheet.________________________ApplicationsComputers ControllersIntelligent InstrumentsCritical µP and µC Power Monitoring Portable/Battery-Powered Equipment____________________________Featureso Small SOT143 Packageo Open-Drain RESET Output Can Exceed V CC o Precision, Factory-Set V CC Reset Thresholds:100mV Increments from 2.5V to 5V o ±1.8% Reset Threshold Accuracy at T A = +25°C o ±2.5% Reset Threshold Accuracy Over Temp.o Four Reset Timeout Periods Available: 1ms, 20ms, 140ms, or 1120ms (minimum) o Immune to Short V CC Transients o 5µA Supply Currento Pin-Compatible with MAX811MAX6315Open-Drain SOT µP Reset Circuit________________________________________________________________Maxim Integrated Products 1__________________Pin Configuration__________Typical Operating Circuit19-2000; Rev 1; 1/99Ordering and Marking Information appear at end of data sheet.For free samples & the latest literature: , or phone 1-800-998-8800.For small orders, phone 1-800-835-8769.M A X 6315Open-Drain SOT µP Reset Circuit 2_______________________________________________________________________________________ABSOLUTE MAXIMUM RATINGSELECTRICAL CHARACTERISTICS(V CC = +2.5V to +5.5V, T A = -40°C to +85°C, unless otherwise noted. Typical values are at T A = +25°C.)Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.Note 1:The MAX6315 monitors V CC through an internal factory-trimmed voltage divider that programs the nominal reset threshold.Factory-trimmed reset thresholds are available in 100mV increments from 2.5V to 5V (see Ordering and Marking Information ).V CC ........................................................................-0.3V to +6.0V RESET ....................................................................-0.3V to +6.0V All Other Pins..............................................-0.3V to (V CC + 0.3V)Input Current (V CC ).............................................................20mA Output Current (RESET )......................................................20mA Rate of Rise (V CC )...........................................................100V/µsContinuous Power Dissipation (T A = +70°C)SOT143 (derate 4mW/°C above +70°C)........................320mW Operating Temperature Range ...........................-40°C to +85°C Storage Temperature Range.............................-65°C to +160°C Lead Temperature (soldering, 10sec).............................+300°CMAX6315Open-Drain SOT µP Reset Circuit_______________________________________________________________________________________360-50-303090SUPPLY CURRENT vs. TEMPERATURE215TEMPERATURE (°C)S U P P L Y C U R R E N T (µA )-101050347060135SUPPLY CURRENT vs. SUPPLY VOLTAGE215SUPPLY VOLTAGE (V)S U P P L Y C U R R E N T (µA )2344500-50-301090POWER-DOWN RESET DELAYvs. TEMPERATURE1040TEMPERATURE (°C)P O W E R -D O W N R E S E T D E L A Y (µs )-1020303050701.040.96-50-301090NORMALIZED RESET TIMEOUT PERIOD vs. TEMPERATURE (V CC RISING)0.970.981.021.001.03M A X 6315-04TEMPERATURE (°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 D-100.991.013050701.0060.994-50-301090NORMALIZED RESET THRESHOLD vs. TEMPERATURE (V CC FALLING)0.9960.9981.0041.000M A X 6315-05TEMPERATURE (°C)N O R M A L I Z E D R E S E T T H R E S H O L D-101.0023050701000101001000MAXIMUM TRANSIENT DURATION vs. RESET COMPARATOR OVERDRIVE20RESET COMP. 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 )406080__________________________________________Typical Operating Characteristics(T A= +25°C, unless otherwise noted.)______________________________________________________________Pin Description_______________Detailed DescriptionReset OutputA microprocessor’s (µP’s) reset input starts the µP in a known state. The MAX6315 asserts reset to prevent code-execution errors during power-up, power-down,or brownout conditions. RESET is guaranteed to be a logic low for V CC > 1V (see Electrical Characteristics ).Once V CC exceeds the reset threshold, the internal timer keeps reset asserted for the reset timeout period (t RP ); after this interval RESET goes high. If a brownout condition occurs (monitored voltage dips below its pro-grammed reset threshold), RESET goes low. Any time V CC dips below the reset threshold, the internal timer resets to zero and RESET goes low. The internal timer starts when V CC returns above the reset threshold, and RESET remains low for the reset timeout period.The MAX6315’s RESET output structure is a simple open-drain N-channel MOSFET switch. Connect a pull-up resistor to any supply in the 0V to +6V range. Select a resistor value large enough to register a logic low when RESET is asserted (see Electrical Characteristics ),and small enough to register a logic high while supply-ing all input current and leakage paths connected to the RESET line. A 10k Ωpull-up is sufficient in most applica-tions.Often, the pull-up connected to the MAX6315’s RESET output will connect to the supply voltage monitored at the IC’s V CC pin. However, some systems may use the open-drain output to level-shift from the monitored sup-ply to reset circuitry powered by some other supply (Figure 1). This is one useful feature of an open-drain output. Keep in mind that as the MAX6315’s V CC decreases below 1V, so does the IC’s ability to sink current at RESET . Finally, with any pull-up, RESET will be pulled high as V CC decays toward 0V. The voltage where this occurs depends on the pull-up resistor value and the voltage to which it connects (see Electrical Characteristics ).Manual-Reset InputMany 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 after MR returns high.MR has an internal 63k Ωpull-up resistor, so it can be left open if not used. Connect a normally open momen-tary switch from MR to GND 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 environment, connecting a 0.1µF capacitor from MR to ground provides additional noise immunity.__________Applications InformationNegative-Going V CC TransientsIn addition to issuing a reset to the µP during power-up,power-down, and brownout conditions, these devices are relatively immune to short-duration negative-going transients (glitches). The Typical Operating Character-istics show the Maximum Transient Duration vs. Reset Threshold Overdrive, for which reset pulses are not generated. The graph was produced using negative-going pulses, starting at V RST max and ending below the programmed reset threshold by the magnitude indi-cated (reset threshold overdrive). The graph shows the maximum pulse width that a negative-going V CC tran-sient may typically have without causing a reset pulse to be issued. As the transient amplitude increases (i.e.,goes farther below the reset threshold), the maximum allowable pulse width decreases. A 0.1µF bypass capacitor mounted close to V CC provides additional transient immunity.M A X 6315Open-Drain SOT µP Reset Circuit 4_______________________________________________________________________________________Figure 1. MAX6315 Open-Drain RESET Output Allows Use with Multiple SuppliesMAX6315Open-Drain SOT µP Reset Circuit_______________________________________________________________________________________5________________________________________________________Ordering Information†The MAX6315 is available in a SOT143 package, -40°C to +85°C temperature range.††The first two letters in the package top mark identify the part, while the remaining two letters are the lot tracking code.†††Sample stocks generally held on the bolded products; also, the bolded products have 2,500 piece minimum-order quantities.Non-bolded products have 10,000 piece minimum-order quantities. Contact factory for details.Note:All devices available in tape-and-reel only. Contact factory for availability.M A X 6315Open-Drain SOT µP Reset Circuit 6__________________________________________________________________________________________________________________________________Ordering Information (continued)†The MAX6315 is available in a SOT143 package, -40°C to +85°C temperature range.††The first two letters in the package top mark identify the part, while the remaining two letters are the lot tracking code.†††Sample stocks generally held on the bolded products; also, the bolded products have 2,500 piece minimum-order quantities.Non-bolded products have 10,000 piece minimum-order quantities. Contact factory for details.Note:All devices available in tape-and-reel only. Contact factory for availability.MAX6315Open-Drain SOT µP Reset Circuit_______________________________________________________________________________________7___________________Chip InformationTRANSISTOR COUNT: 519________________________________________________________Package InformationM A X 6315Open-Drain SOT µP Reset Circuit NOTESMaxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.8_____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600©1999 Maxim Integrated ProductsPrinted USAis a registered trademark of Maxim Integrated Products.。
max3485中文资料
max3485中文资料MAX3483，MAX3485，MAX3486，MAX3488，MAX3490以及MAX3491是用于RS-485与RS-422通信的3.3V，低功耗收发器，每个器件中都具有一个驱动器和一个接收器。
MAX3483和MAX3488具有限摆率驱动器，可以减小EMI，并降低由不恰当的终端匹配电缆引起的反射，实现最高250kbps的无差错数据传输。
MAX3486的驱动器摆率部分受限，可以实现最高2.5Mbps的传输速率。
MAX3485，MAX3490和MAX3491则可以实现最高10Mbps 的传输速率。
驱动器具有短路电流限制，并可以通过热关断电路将驱动器输出置为高阻状态，防止过度的功率损耗。
接收器输入具有失效保护特性，当输入开路时，可以确保逻辑高电平输出。
特性●半双工●速率：10Mbps●限摆率：NO●接收允许控制：YES●关断电流：2nA●引脚数：8这些收发器在驱动器禁用的空载或满载状态下，吸取的电源电流在120µA至500µA之间。
另外，MAX481、MAX483与MAX487具有低电流关断模式，仅消耗0.1µA。
所有器件都工作在5V单电源下。
采用单一电源+5 V工作，额定电流为300 μA，采用半双工通讯方式。
它完成将TTL电平转换为RS－485电平的功能。
MAX485芯片的结构和引脚都非常简单,内部含有一个驱动器和接收器。
RO和DI 端分别为接收器的输出和驱动器的输入端，与单片机连接时只需分别与单片机的RXD和TXD相连即可；/RE和DE端分别为接收和发送的使能端，当/RE为逻辑0时，器件处于接收状态；当DE为逻辑1时，器件处于发送状态，因为MAX485工作在半双工状态，所以只需用单片机的一个管脚控制这两个引脚即可；A端和B端分别为接收和发送的差分信号端,当A引脚的电平高于B时，代表发送的数据为1；当A的电平低于B端时，代表发送的数据为0。
MAX630CSA+中文资料
General DescriptionMaxim’s MAX630 and MAX4193 CMOS DC-DC regula-tors are designed for simple, efficient, minimum-size DC-DC converter circuits in the 5mW to 5W range. The MAX630 and MAX4193 provide all control and power handling functions in a compact 8-pin package: a 1.31V bandgap reference, an oscillator, a voltage com-parator, and a 375mA N-channel output MOSF ET. A comparator is also provided for low-battery detection.Operating current is only 70µA and is nearly indepen-dent of output switch current or duty cycle. A logic-level input shuts down the regulator to less than 1µA quies-cent current. Low-current operation ensures high effi-ciency even in low-power battery-operated systems.The MAX630 and MAX4193 are compatible with most battery voltages, operating from 2.0V to 16.5V.The devices are pin compatible with the Raytheon bipo-lar circuits, RC4191/2/3, while providing significantly improved efficiency and low-voltage operation. Maxim also manufactures the MAX631, MAX632, and MAX633DC-DC converters, which reduce the external compo-nent count in fixed-output 5V, 12V, and 15V circuits.See Table 2 at the end of this data sheet for a summary of other Maxim DC-DC converters.Applications+5V to +15V DC-DC ConvertersHigh-Efficiency Battery-Powered DC-DC Converters+3V to +5V DC-DC Converters 9V Battery Life ExtensionUninterruptible 5V Power Supplies5mW to 5W Switch-Mode Power SuppliesFeatures♦High Efficiency—85% (typ)♦70µA Typical Operating Current ♦1µA Maximum Quiescent Current ♦2.0V to 16.5V Operation♦525mA (Peak) Onboard Drive Capability ♦±1.5% Output Voltage Accuracy (MAX630)♦Low-Battery Detector♦Compact 8-Pin Mini-DIP and SO Packages ♦Pin Compatible with RC4191/2/3MAX630/MAX4193CMOS Micropower Step-UpSwitching Regulator________________________________________________________________Maxim Integrated Products 1Pin ConfigurationOrdering InformationTypical Operating Circuit19-0915; Rev 2; 9/08For pricing, delivery, and ordering information,please contact Maxim/Dallas Direct!at 1-888-629-4642, or visit Maxim’s website at .*Dice are specified at T A = +25°C. Contact factory for dice specifications.**Contact factory for availability and processing to MIL-STD-883.†Contact factory for availibility.M A X 630/M A X 4193CMOS Micropower Step-Up Switching Regulator 2_______________________________________________________________________________________ABSOLUTE MAXIMUM RATINGSELECTRICAL CHARACTERISTICSStresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.Supply Voltage.......................................................................18V Storage Temperature Range ............................-65°C to +160°C Lead Temperature (soldering, 10s).................................+300°C Operating Temperature RangeMAX630C, MAX4193C........................................0°C to +70°C MAX630E, MAX4193E.....................................-40°C to +85°C MAX630M, MAX4193M..................................-55°C to +125°CPower Dissipation8-Pin PDIP (derate 6.25mW/°C above +50°C).............468mW 8-Pin SO (derate 5.88mW/°C above +50°C)................441mW 8-Pin CERDIP (derate 8.33mW/°C above +50°C)........833mW Input Voltage (Pins 1, 2, 6, 7).....................-0.3V to (+V S + 0.3V)Output Voltage, L X and LBD..................................................18V L X Output Current..................................................525mA (Peak)LBD Output Current............................................................50mAMAX630/MAX4193CMOS Micropower Step-UpSwitching Regulator_______________________________________________________________________________________3L X ON-RESISTANCE vs.TEMPERATURETEMPERATURE (°C)L X R O N (Ω)100755025-25-5024680125SUPPLY CURRENT vs.TEMPERATUREM A X 630/4193 t o c 02TEMPERATURE (°C)I S (μA )100755025-25-50402080601201001400125SUPPLY CURRENT vs.SUPPLY VOLTAGEM A X 630/4193 t o c 03+V S (V)I S (μA )14121086425015010025020030016Typical Operating Characteristics(T A = +25°C, unless otherwise noted.)ELECTRICAL CHARACTERISTICSNote 1:Guaranteed by correlation with DC pulse measurements.Note 2:The operating frequency range is guaranteed by design and verified with sample testing.Detailed DescriptionThe operation of the MAX630 can best be understood by examining the voltage regulating loop of F igure 1.R1 and R2 divide the output voltage, which is com-pared with the 1.3V internal reference by comparator COMP1. When the output voltage is lower than desired,the comparator output goes high and the oscillator out-put pulses are passed through the NOR gate latch,turning on the output N-channel MOSFET at pin 3, L X .As long as the output voltage is less than the desired voltage, pin 3 drives the inductor with a series of pulses at the oscillator frequency.Each time the output N-channel MOSFET is turned on,the current through the external coil, L1, increases,storing energy in the coil. Each time the output turns off,the voltage across the coil reverses sign and the volt-age at L X rises until the catch diode, D1, is forward biased, delivering power to the output.When the output voltage reaches the desired level,1.31V x (1 + R1 / R2), the comparator output goes low and the inductor is no longer pulsed. Current is then supplied by the filter capacitor, C1, until the output volt-age drops below the threshold, and once again L X is switched on, repeating the cycle. The average duty cycle at L X is directly proportional to the output current.Output Driver (L X Pin)The MAX630/MAX4193 output device is a large N-channel MOSFET with an on-resistance of 4Ωand a peak current rating of 525mA. One well-known advan-tage that MOSF ETs have over bipolar transistors in switching applications is higher speed, which reduces switching losses and allows the use of smaller, lighter,less costly magnetic components. Also important is that MOSF ETs, unlike bipolar transistors, do not require base current that, in low-power DC-DC converters,often accounts for a major portion of input power.The operating current of the MAX630 and MAX4193increases by approximately 1µA/kHz at maximum power output due to the charging current required by the gate capacitance of the L X output driver (e.g., 40µA increase at a 40kHz operating frequency). In compari-son, equivalent bipolar circuits typically drive their NPN L X output device with 2mA of base drive, causing the bipolar circuit’s operating current to increase by a fac-tor of 10 between no load and full load.OscillatorThe oscillator frequency is set by a single external, low-cost ceramic capacitor connected to pin 2, C X . 47pF sets the oscillator to 40kHz, a reasonable compromise between lower switching losses at low frequencies and reduced inductor size at higher frequencies.M A X 630/M A X 4193CMOS Micropower Step-Up Switching Regulator 4_______________________________________________________________________________________Low-Battery DetectorThe low-battery detector compares the voltage on LBR with the internal 1.31V reference. The output, LBD, is an open-drain N-channel MOSFET. In addition to detecting and warning of a low battery voltage, the comparator can also perform other voltage-monitoring operations such as power-failure detection.Another use of the low-battery detector is to lower the oscillator frequency when the input voltage goes below a specified level. Lowering the oscillator frequency increases the available output power, compensating for the decrease in available power caused by reduced input voltage (see Figure 5).Logic-Level Shutdown InputThe shutdown mode is entered whenever I C (pin 6) is driven below 0.2V or left floating. When shut down, theMAX630’s analog circuitry, oscillator, L X , and LBD out-puts are turned off. The device’s quiescent current dur-ing shutdown is typically 10nA (1µA max).Bootstrapped OperationIn most circuits, the preferred source of +V S voltage for the MAX630 and MAX4193 is the boosted output volt-age. This is often referred to as a “bootstrapped” oper-ation since the circuit figuratively “lifts” itself up.The on-resistance of the N-channel L X output decreas-es with an increase in +V S ; however, the device operat-ing current goes up with +V S (see the Typical Operating Characteristics , I S vs. +V S graph). In circuits with very low output current and input voltages greater than 3V, it may be more efficient to connect +V S direct-ly to the input voltage rather than bootstrap.MAX630/MAX4193CMOS Micropower Step-UpSwitching Regulator_______________________________________________________________________________________5Figure 1. +5V to +15V Converter and Block DiagramM A X 630/M A X 4193External ComponentsResistorsSince the LBR and V FB input bias currents are specified as 10nA (max), the current in the dividers R1/R2 and R3/R4 (Figure 1) may be as low as 1µA without signifi-cantly affecting accuracy. Normally R2 and R4 are between 10k Ωand 1M Ω, which sets the current in the voltage-dividers in the 1.3µA to 130µA range. R1 and R3 can then be calculated as follows:where V OUT is the desired output voltage and V LB isthe desired low-battery warning threshold.If the I C (shutdown) input is pulled up through a resistor rather than connected directly to +V S , the current through the pullup resistor should be a minimum of 4µAInductor ValueThe available output current from a DC-DC voltageboost converter is a function of the input voltage, exter-nal inductor value, output voltage, and the operating frequency.The inductor must 1) have the correct inductance, 2) be able to handle the required peak currents, and 3) have acceptable series resistance and core losses. If the inductance is too high, the MAX630 will not be able to deliver the desired output power, even with the L X out-put on for every oscillator cycle. The available output power can be increased by either decreasing the inductance or the frequency. Reducing the frequency increases the on-period of the L X output, thereby increasing the peak inductor current. The available out-put power is increased since it is proportional to the square of the peak inductor current (I PK ).where P OUT includes the power dissipated in the catchdiode (D1) as well as that in the load. If the inductance is too low, the current at L X may exceed the maximum rating. The minimum allowed inductor value is expressed by:where I MAX ≈525mA (peak L X current) and t ON is the on-time of the L X output.The most common MAX630 circuit is a boost-mode converter (Figure 1). When the N-channel output device is on, the current linearly rises since:At the end of the on-time (14µs for 40kHz, 55% duty-cycle oscillator) the current is:The energy in the coil is:At maximum load, this cycle is repeated 40,000 timesper second, and the power transferred through the coil is 40,000 x 5.25 = 210mW. Since the coil only supplies the voltage above the input voltage, at 15V, the DC-DC converter can supply 210mW / (15V - 5V) = 21mA. The coil provides 210mW and the battery directly supplies another 105mW, for a total of 315mW of output power. If the load draws less than 21mA, the MAX630 turns on its output only often enough to keep the output voltage at a constant 15V.Reducing the inductor value increases the available output current: lower L increases the peak current,thereby increasing the available power. The external inductor required by the MAX630 is readily obtained from a variety of suppliers (Table 1). Standard coils are suitable for most applications.Types of InductorsMolded InductorsThese are cylindrically wound coils that look similar to 1W resistors. They have the advantages of low cost and ease of handling, but have higher resistance, higher losses, and lower power handling capability than other types.102112131131104134131131ΩΩΩΩ≤≤=−≤≤=− .. ..R M R R x V VR M R R x V VOUTLBCMOS Micropower Step-Up Switching Regulator 6_______________________________________________________________________________________Potted Toroidal InductorsA typical 1mH, 0.82Ωpotted toroidal inductor (Dale TE-3Q4TA) is 0.685in in diameter by 0.385in high and mounts directly onto a PC board by its leads. Such devices offer high efficiency and mounting ease, but at a somewhat higher cost than molded inductors.Ferrite Cores (Pot Cores)Pot cores are very popular as switch-mode inductors since they offer high performance and ease of design.The coils are generally wound on a plastic bobbin,which is then placed between two pot core sections. A simple clip to hold the core sections together com-pletes the inductor. Smaller pot cores mount directly onto PC boards through the bobbin terminals. Cores come in a wide variety of sizes, often with the center posts ground down to provide an air gap. The gap pre-vents saturation while accurately defining the induc-tance per turn squared.Pot cores are suitable for all DC-DC converters, but are usually used in the higher power applications. They are also useful for experimentation since it is easy to wind coils onto the plastic bobbins.Toroidal CoresIn volume production, the toroidal core offers high per-formance, low size and weight, and low cost. They are,however, slightly more difficult for prototyping, in that manually winding turns onto a toroid is more tedious than on the plastic bobbins used with pot cores.Toroids are more efficient for a given size since the flux is more evenly distributed than in a pot core, where the effective core area differs between the post, side, top,and bottom.Since it is difficult to gap a toroid, manufacturers produce toroids using a mixture of ferromagnetic powder (typically iron or Mo-Permalloy powder) and a binder. The perme-ability is controlled by varying the amount of binder,which changes the effective gap between the ferromag-netic particles. Mo-Permalloy powder (MPP) cores have lower losses and are recommended for the highest effi-ciency, while iron powder cores are lower cost.DiodesIn most MAX630 circuits, the inductor current returns to zero before L X turns on for the next output pulse. This allows the use of slow turn-off diodes. On the other hand, the diode current abruptly goes from zero to full peak current each time L X switches off (Figure 1, D1).To avoid excessive losses, the diode must therefore have a fast turn-on time.F or low-power circuits with peak currents less than 100mA, signal diodes such as 1N4148s perform well.For higher-current circuits, or for maximum efficiency at low power, the 1N5817 series of Schottky diodes are recommended. Although 1N4001s and other general-purpose rectifiers are rated for high currents, they are unacceptable because their slow turn-on time results in excessive losses.MAX630/MAX4193CMOS Micropower Step-UpSwitching Regulator_______________________________________________________________________________________7Table 1. Coil and Core ManufacturersM A X 630/M A X 4193Filter CapacitorThe output-voltage ripple has two components, with approximately 90 degrees phase difference between them. One component is created by the change in the capacitor’s stored charge with each output pulse. The other ripple component is the product of the capacitor’s charge/discharge current and its effective series resis-tance (ESR). With low-cost aluminum electrolytic capacitors, the ESR-produced ripple is generally larger than that caused by the change in charge.where V IN is the coil input voltage, L is its inductance, f is the oscillator frequency, and ESR is the equivalent series resistance of the filter capacitor.The output ripple resulting from the change in charge on the filter capacitor is:where t CHG and t DIS are the charge and dischargetimes for the inductor (1/2f can be used for nominal cal-culations).Oscillator Capacitor, C XThe oscillator capacitor, C X , is a noncritical ceramic or silver mica capacitor. C X can also be calculated by:where f is the desired operating frequency in Hertz, and C INT is the sum of the stray capacitance on the C X pin and the internal capacitance of the package. The internal capacitance is typically 1pF for the plastic package and 3pF for the CERDIP package. Typical stray capacitances are about 3pF for normal PC board layouts, but will be significantly higher if a socket is used.Bypassing and CompensationSince the inductor-charging current can be relatively large, high currents can flow through the ground con-nection of the MAX630/MAX4193. To prevent unwanted feedback, the impedance of the ground path must be as low as possible, and supply bypassing should be used for the device.When large values (>50k Ω) are used for the voltage-setting resistors, R1 and R2 of F igure 1, stray capaci-tance at the V FB input can add a lag to the feedback response, destabilizing the regulator, increasing low-frequency ripple, and lowering efficiency. This can often be avoided by minimizing the stray capacitance at the V FB node. It can also be remedied by adding a lead compensation capacitor of 100pF to 10nF in paral-lel with R1 in Figure 1.DC-DC Converter ConfigurationsDC-DC converters come in three basic topologies:buck, boost, and buck-boost (Figure 2). The MAX630 is usually operated in the positive-voltage boost circuit,where the output voltage is greater than the input.The boost circuit is used where the input voltage is always less than the desired output and the buck circuit is used where the input is greater than the output. Thebuck-boost circuit inverts, and can be used with, inputCMOS Micropower Step-Up Switching Regulator 8_______________________________________________________________________________________Figure 2. DC-DC Converter Configurationsvoltages that are either greater or less than the output. DC-DC converters can also be classified by the control method. The two most common are pulse-width modu-lation (PWM) and pulse-frequency modulation (PF M). PWM switch-mode power-supply ICs (of which current-mode control is one variant) are well-established in high-power off-line switchers. Both PWM and PF M cir-cuits control the output voltage by varying duty cycle. In the PWM circuit, the frequency is held constant and the width of each pulse is varied. In the PFM circuit, the pulse width is held constant and duty cycle is con-trolled by changing the pulse repetition rate.The MAX630 refines the basic PFM by employing a con-stant-frequency oscillator. Its output MOSFET is switched on when the oscillator is high and the output voltages is lower than desired. If the output voltage is higher than desired, the MOSFET output is disabled for that oscillator cycle. This pulse skipping varies the average duty cycle, and thereby controls the output voltage.Note that, unlike the PWM ICs, which use an op amp as the control element, the MAX630 uses a comparator tocompare the output voltage to an onboard reference. This reduces the number of external components and operating current.Typical Applications+5V to +15V DC-DC Converter Figure 1 shows a simple circuit that generates +15V at approximately 20mA from a +5V input. The MAX630 has a ±1.5% reference accuracy, so the output voltage has an untrimmed accuracy of ±3.5% if R1 and R2 are 1% resistors. Other output voltages can also be select-ed by changing the feedback resistors. Capacitor C X sets the oscillator frequency (47pF = 40kHz), while C1 limits output ripple to about 50mV.With a low-cost molded inductor, the circuit’s efficiency is about 75%, but an inductor with lower series resis-tance such as the Dale TE3Q4TA increases efficiency to around 85%. A key to high efficiency is that the MAX630 itself is powered from the +15V output. This provides the onboard N-channel output device with 15V gate drive, lowering its on-resistance to about 4Ω. When +5V power is first applied, current flows through L1 and D1, supplying the MAX630 with 4.4V for startup.+5V to ±15V DC-DC Converter The circuit in F igure 3 is similar to that of F igure 1 except that two more windings are added to the induc-tor. The 1408 (14mm x 8mm) pot core specified is an IEC standard size available from many manufacturers (see Table 1). The -15V output is semiregulated, typi-cally varying from -13.6V to -14.4V as the +15V load current changes from no load to 20mA.2.5W, 3V to 5V DC-DC ConverterSome systems, although battery powered, need high currents for short periods, and then shut down to a low-power state. The extra circuitry of Figure 4 is designed tomeet these high-current needs. Operating in the buck-boost or flyback mode, the circuit converts -3V to +5V.The left side of Figure 4 is similar to Figure 1 and sup-plies 15V for the gate drive of the external power MOS-FET. This 15V gate drive ensures that the external deviceis completely turned on and has low on-resistance.The right side of F igure 4 is a -3V to +5V buck-boost converter. This circuit has the advantage that when theMAX630 is turned off, the output voltage falls to 0V,unlike the standard boost circuit, where the output volt-age is V BATT- 0.6V when the converter is shut down.When shut down, this circuit uses less than 10µA, withmost of the current being the leakage current of the power MOSFET.The inductor and output-filter capacitor values havebeen selected to accommodate the increased power levels. With the values indicated, this circuit can supplyup to 500mA at 5V, with 85% efficiency. Since the leftside of the circuit powers only the right-hand MAX630,the circuit starts up with battery voltages as low as1.5V, independent of the loading on the +5V output.MAX630/MAX4193CMOS Micropower Step-UpSwitching Regulator _______________________________________________________________________________________9M A X 630/M A X 4193+3V Battery to +5V DC-DC ConverterA common power-supply requirement involves conver-sion of a 2.4V or 3V battery voltage to a 5V logic sup-ply. The circuit in Figure 5 converts 3V to 5V at 40mA with 85% efficiency. When I C (pin 6) is driven low, the output voltage will be the battery voltage minus the drop across diode D1.The optional circuitry using C1, R3, and R4 lowers the oscillator frequency when the battery voltage falls to 2.0V. This lower frequency maintains the output-power capability of the circuit by increasing the peak inductor current, compensating for the reduced battery voltage.Uninterruptable +5V SupplyIn Figure 6, the MAX630 provides a continuous supply of regulated +5V, with automatic switchover between line power and battery backup. When the line-powered input voltage is at +5V, it provides 4.4V to the MAX630and trickle charges the battery. If the line-powered input falls below the battery voltage, the 3.6V battery supplies power to the MAX630, which boosts the bat-tery voltage up to +5V, thus maintaining a continuous supply to the uninterruptable +5V bus. Since the +5V output is always supplied through the MAX630, there are no power spikes or glitches during power transfer.The MAX630’s low-battery detector monitors the line-powered +5V, and the LBD output can be used to shut down unnecessary sections of the system during power failures. Alternatively, the low-battery detector could monitor the NiCad battery voltage and provide warning of power loss when the battery is nearly discharged.Unlike battery backup systems that use 9V batteries,this circuit does not need +12V or +15V to recharge the battery. Consequently, it can be used to provide +5V backup on modules or circuit cards that only have 5V available.9V Battery Life ExtenderFigure 7’s circuit provides a minimum of 7V until the 9V battery voltage falls to less than 2V. When the battery voltage is above 7V, the MAX630’s I C pin is low, putting it into the shutdown mode that draws only 10nA. When the battery voltage falls to 7V, the MAX8212 voltage detector’s output goes high, enabling the MAX630. The MAX630 then maintains the output voltage at 7V, even as the battery voltage falls below 7V. The LBD is used to decrease the oscillator frequency when the battery voltage falls to 3V, thereby increasing the output cur-rent capability of the circuit.CMOS Micropower Step-Up Switching Regulator 10______________________________________________________________________________________Figure 4. High-Power 3V to 5V Converter with ShutdownNote that this circuit (with or without the MAX8212) can be used to provide 5V from four alkaline cells. The initial volt-age is approximately 6V, and the output is maintained at 5V even when the battery voltage falls to less than 2V.Dual-Tracking RegulatorA MAX634 inverting regulator is combined with a MAX630 in F igure 8 to provide a dual-tracking ±15Voutput from a 9V battery. The reference for the -15V output is derived from the positive output through R3and R4. Both regulators are set to maximize output power at low-battery voltage by reducing the oscillator frequency, through LBR, when V BATT falls to 7.2V.MAX630/MAX4193Switching Regulator______________________________________________________________________________________11Figure 5. 3V to 5V Converter with Low-Battery Frequency ShiftFigure 7. Battery Life Extension Down to 3V InFigure 6. Uninterruptable +5V SupplyM A X 630/M A X 4193Switching Regulator 12______________________________________________________________________________________Table 2. Maxim DC-DC ConvertersFigure 8. ±12V Dual-Tracking RegulatorMAX630/MAX4193Switching Regulator______________________________________________________________________________________13Package InformationFor the latest package outline information, go to /packages .Chip TopographyLBR17I CV FB6230.089"(2.26mm)C XL XM A X 630/M A X 4193Switching Regulator 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.Revision History。
MAX3490CPA+中文资料
_______________General DescriptionThe MAX3483, MAX3485, MAX3486, MAX3488,MAX3490, and MAX3491 are 3.3V, low-power trans-ceivers for RS-485 and RS-422 communication. Each part contains one driver and one receiver. The MAX3483 and MAX3488 feature slew-rate-limited dri-vers that minimize EMI and reduce reflections caused by improperly terminated cables, allowing error-free data transmission at data rates up to 250kbps. The par-tially slew-rate-limited MAX3486 transmits up to 2.5Mbps. The MAX3485, MAX3490, and MAX3491transmit at up to 10Mbps.Drivers are short-circuit current limited and are protect-ed against excessive power dissipation by thermal shutdown circuitry that places the driver outputs into a high-impedance state. The receiver input has a fail-safe feature that guarantees a logic-high output if both inputs are open circuit.The MAX3488, MAX3490, and MAX3491 feature full-duplex communication, while the MAX3483, MAX3485,and MAX3486 are designed for half-duplex communi-cation.________________________ApplicationsLow-Power RS-485/RS-422 Transceivers TelecommunicationsTransceivers for EMI-Sensitive Applications Industrial-Control Local Area Networks____________________________Featureso Operate from a Single 3.3V Supply—No Charge Pump!o Interoperable with +5V Logico 8ns Max Skew (MAX3485/MAX3490/MAX3491)o Slew-Rate Limited for Errorless Data Transmission (MAX3483/MAX3488) o 2nA Low-Current Shutdown Mode(MAX3483/MAX3485/MAX3486/MAX3491)o -7V to +12V Common-Mode Input Voltage Range o Allows up to 32 Transceivers on the Bus o Full-Duplex and Half-Duplex Versions Available o Industry Standard 75176 Pinout (MAX3483/MAX3485/MAX3486)o Current-Limiting and Thermal Shutdown for Driver Overload Protection______________Ordering Information* Contact factory for for dice specifications.MAX3483/MAX3485/MAX3486/MAX3488/MAX3490/MAX34913.3V-Powered, 10Mbps and Slew-Rate-LimitedTrue RS-485/RS-422 Transceivers________________________________________________________________Maxim Integrated Products1Call toll free 1-800-998-8800 for free samples or literature.19-0333; Rev 0; 12/94PART NUMBER GUARANTEED DATA RATE (Mbps)SUPPLY VOLTAGE(V)HALF/FULL DUPLEXSLEW-RATE LIMITEDDRIVER/RECEIVER ENABLESHUTDOWN CURRENT (nA)PIN COUNT MAX34830.25Half Yes Yes 28MAX348510Half No Yes 28MAX3486 2.5Half Yes Yes 28MAX34880.25Full Yes No —8MAX349010Full No No —8MAX3491103.0 to 3.6FullNoYes214______________________________________________________________Selection TableM A X 3483/M A X 3485/M A X 3486/M A X 3488/M A X 3490/M A X 34913.3V-Powered, 10Mbps and Slew-Rate-Limited True RS-485/RS-422 Transceivers2_______________________________________________________________________________________ABSOLUTE MAXIMUM RATINGSDC ELECTRICAL CHARACTERISTICS(V CC = 3.3V ±0.3V, T A = T MIN to T MAX , unless otherwise noted. Typical values are at T A = +25°C)Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.Supply Voltage (V CC )...............................................................7V Control Input Voltage (RE, DE)...................................-0.3V to 7V Driver Input Voltage (DI).............................................-0.3V to 7V Driver Output Voltage (A, B, Y, Z)..........................-7.5V to 12.5V Receiver Input Voltage (A, B)................................-7.5V to 12.5V Receiver Output Voltage (RO)....................-0.3V to (V CC + 0.3V)Continuous Power Dissipation (T A = +70°C)8-Pin Plastic DIP (derate 9.09mW/°C above +70°C).....727mW 8-Pin SO (derate 5.88mW/°C above +70°C)..................471mW14-Pin Plastic DIP (derate 10mW/°C above +70°C)......800mW 14-Pin SO (derate 8.33mW/°C above +70°C)................667mW Operating Temperature RangesMAX34_ _C_ _.......................................................0°C to +70°C MAX34_ _E_ _....................................................-40°C to +85°C Storage Temperature Range.............................-65°C to +160°C Lead Temperature (soldering, 10sec).............................+300°CMAX3483/MAX3485/MAX3486/MAX3488/MAX3490/MAX34913.3V-Powered, 10Mbps and Slew-Rate-LimitedTrue RS-485/RS-422 Transceivers_______________________________________________________________________________________3DC ELECTRICAL CHARACTERISTICS (continued)(V CC = 3.3V ±0.3V, T A = T MIN to T MAX , unless otherwise noted. Typical values are at T A = +25°C)DRIVER SWITCHING CHARACTERISTICS—MAX3485, MAX3490, and MAX3491(V CC = 3.3V, T A = +25°C)DRIVER SWITCHING CHARACTERISTICS—MAX3486(V CC = 3.3V, T A = +25°C)M A X 3483/M A X 3485/M A X 3486/M A X 3488/M A X 3490/M A X 34913.3V-Powered, 10Mbps and Slew-Rate-Limited True RS-485/RS-422 Transceivers4_______________________________________________________________________________________DRIVER SWITCHING CHARACTERISTICS—MAX3483 and MAX3488(V CC = 3.3V, T A = +25°C)RECEIVER SWITCHING CHARACTERISTICS(V CC = 3.3V, T A = +25°C)Note 1:∆V OD and ∆V OC are the changes in V OD and V OC , respectively, when the DI input changes state.Note 2:Measured on |t PLH (Y) - t PHL (Y)|and |t PLH (Z) - t PHL (Z)|.Note 3:The transceivers are put into shutdown by bringing RE high and DE low. If the inputs are in this state for less than 80ns, theparts are guaranteed not to enter shutdown. If the inputs are in this state for at least 300ns, the parts are guaranteed to have entered shutdown. See Low-Power Shutdown Mode section.MAX3483/MAX3485/MAX3486/MAX3488/MAX3490/MAX34913.3V-Powered, 10Mbps and Slew-Rate-LimitedTrue RS-485/RS-422 Transceivers_______________________________________________________________________________________5__________________________________________Typical Operating Characteristics(V CC = 3.3V, T A = +25°C, unless otherwise noted.)252015105000.51.01.52.02.53.53.0OUTPUT CURRENT vs.RECEIVER OUTPUT LOW VOLTAGEM A X 3483-01OUTPUT LOW VOLTAGE (V)O U T P U T C U R R E N T (m A )-20-18-16-14-12-10-8-6-4-2000.51.01.52.02.53.53.0OUTPUT CURRENT vs.RECEIVER OUTPUT HIGH VOLTAGEM A X 3483-02OUTPUT HIGH VOLTAGE (V)O U T P U T C U R R E N T (m A )3.003.053.103.153.203.253.30-40-20020406010080RECEIVER OUTPUT HIGH VOLTAGEvs. TEMPERATURETEMPERATURE (°C)O U T P U T H I G H V O L T A G E (V )00.10.20.30.40.50.60.70.8-40-2020406010080RECEIVER OUTPUT LOW VOLTAGEvs. TEMPERATURETEMPERATURE (°C)O U T P U T L O W V O L T A G E (V )2505075100125150175024681012OUTPUT CURRENT vs. DRIVER OUTPUT LOW VOLTAGEM A X 3483-07OUTPUT LOW VOLTAGE (V)O U T P U T C U R R E N T (m A )100908070605040302010000.5 1.0 1.5 2.0 2.5 3.53.0DRIVER OUTPUT CURRENT vs. DIFFERENTIAL OUTPUT VOLTAGEM A X 3483-05DIFFERENTIAL OUTPUT VOLTAGE (V)O U T P U T C U R R E N T (m A )1.61.71.81.92.02.12.22.32.42.62.5-40-2020406010080DRIVER DIFFERENTIAL OUTPUT VOLTAGE vs.TEMPERATURETEMPERATURE (°C)D I F FE R E N T I A L O U T P U T V O L T A G E (V )-100-80-60-40-20543210-7-6-3-4-5-2-1OUTPUT CURRENT vs. DRIVER OUTPUT HIGH VOLTAGEM A X 3483-08OUTPUT HIGH VOLTAGE (V)O U T P U T C U R R E N T (m A )M A X 3483/M A X 3485/M A X 3486/M A X 3488/M A X 3490/M A X 34913.3V-Powered, 10Mbps and Slew-Rate-Limited True RS-485/RS-422 Transceivers0.80.70.91.01.11.2-40-2020406010080SUPPLY CURRENT vs. TEMPERATURETEMPERATURE (°C)S U P P L Y C U R R E N T (m A )_____________________________Typical Operating Characteristics (continued)0102030405060708010090-40-2020406010080SHUTDOWN CURRENT vs. TEMPERATUREM A X 3483-10TEMPERATURE (°C)S H U T D O W N C U R R E N T (n A )______________________________________________________________Pin DescriptionMAX3483/MAX3485/MAX3486/MAX3488/MAX3490/MAX34913.3V-Powered, 10Mbps and Slew-Rate-LimitedTrue RS-485/RS-422 Transceivers_______________________________________________________________________________________7Figure 2. MAX3488/MAX3490 Pin Configuration and Typical Operating CircuitFigure 3. MAX3491 Pin Configuration and Typical Operating CircuitFigure 1. MAX3483/MAX3485/MAX3486 Pin Configuration and Typical Operating CircuitM A X 3483/M A X 3485/M A X 3486/M A X 3488/M A X 3490/M A X 34913.3V-Powered, 10Mbps and Slew-Rate-Limited True RS-485/RS-422 Transceivers8_______________________________________________________________________________________Figure 4. Driver V OD and V OC Figure 7.Driver Differential Output Delay and Transition TimesFigure 6.Receiver V OH and V OLFigure 5. Driver V OD with Varying Common-Mode VoltageMAX3483/MAX3485/MAX3486/MAX3488/MAX3490/MAX34913.3V-Powered, 10Mbps and Slew-Rate-LimitedTrue RS-485/RS-422 Transceivers_______________________________________________________________________________________9Figure 8.Driver Propagation TimesFigure 9.Driver Enable and Disable Times (t PZH , t PSH , t PHZ )Figure 10.Driver Enable and Disable Times (t PZL , t PSL , t PLZ )M A X 3483/M A X 3485/M A X 3486/M A X 3488/M A X 3490/M A X 34913.3V-Powered, 10Mbps and Slew-Rate-Limited True RS-485/RS-422 Transceivers10______________________________________________________________________________________Figure 11.Receiver Propagation DelayFigure 12.Receiver Enable and Disable TimesNote 4: The input pulse is supplied by a generator with the following characteristics: PRR = 250kHz, 50% duty cycle, t r ≤6.0ns, Z O = 50Ω.Note 5: C L includes probe and stray capacitance.____________________Function TablesDevices with Receiver/Driver Enable (MAX3483/MAX3485/MAX3486/MAX3491)Table 1. Transmitting* B and A outputs are Z and Y, respectively, for full-duplex part (MAX3491).X = Don’t care; High-Z = High impedanceTable 2. Receiving* DE is a “don’t care” (x) for the full-duplex part (MAX3491).X = Don’t care; High-Z = High impedanceDevices without Receiver/Driver Enable(MAX3488/MAX3490)Table 3. TransmittingTable 4. Receiving__________Applications InformationThe MAX3483/MAX3485/MAX3486/MAX3488/MAX3490/MAX3491 are low-power transceivers for RS-485 and RS-422 communications. The MAX3483 and MAX3488can transmit and receive at data rates up to 250kbps,the MAX3486 at up to 2.5Mbps, and the MAX3485/MAX3490/MAX3491 at up to 10Mbps. The MAX3488/MAX3490/MAX3491 are full-duplex transceivers, while the MAX3483/MAX3485/MAX3486 are half-duplex.Driver Enable (DE) and Receiver Enable (RE) pins are included on the MAX3483/MAX3485/MAX3486/MAX3491. When disabled, the driver and receiver out-puts are high impedance.Reduced EMI and Reflections (MAX3483/MAX3486/MAX3488)The MAX3483/MAX3488 are slew-rate limited, minimiz-ing EMI and reducing reflections caused by improperly terminated cables. Figure 13 shows both the driver output waveform of a MAX3485/MAX3490/MAX3491transmitting a 125kHz signal and the Fourier analysis of that waveform. High-frequency harmonics with large amplitudes are evident. Figure 14 shows the same infor-mation, but for the slew-rate-limited MAX3483/MAX3488transmitting the same signal. The high-frequency har-monics have much lower amplitudes, and the potential for EMI is significantly reduced.Low-Power Shutdown Mode(MAX3483/MAX3485/MAX3486/MAX3491)A low-power shutdown mode is initiated by bringing both RE high and DE low. The devices will not shut down unless both the driver and receiver are disabled (high impedance). In shutdown, the devices typically draw only 2nA of supply current.For these devices, the t PSH and t PSL enable times assume the part was in the low-power shutdown mode;the t PZH and t PZL enable times assume the receiver or driver was disabled, but the part was not shut down.MAX3483/MAX3485/MAX3486/MAX3488/MAX3490/MAX3491True RS-485/RS-422 Transceivers______________________________________________________________________________________11INPUTS OUTPUT A, B RO ≥+0.2V 1≤-0.2V 0Inputs Open1INPUT OUTPUTS DI Z Y 101015MHz500kHz/div 0Hz 5MHz500kHz/div 0Hz Figure 13. Driver Output Waveform and FFT Plot of MAX3485/MAX3490/MAX3491 Transmitting a 125kHz Signal Figure 14. Driver Output Waveform and FFT Plot of MAX3483/MAX3488 Transmitting a 125kHz SignalM A X 3483/M A X 3485/M A X 3486/M A X 3488/M A X 3490/M A X 3491True RS-485/RS-422 Transceivers12______________________________________________________________________________________B 1V/divA 1V/divRO 2V/div20ns/divDI 5V/div V Y - V Z 2V/divRO 5V/div2µs/divB 1V/divA 1V/divRO 2V/div1µs/divDI 2V/div 20ns/divZ 1V/divY 1V/divDI 2V/div Z 1V/div Y 1V/div1µs/divDI 5V/div V Y - V Z 2V/divRO 5V/div2µs/divFigure 15.MAX3485/MAX3490/MAX3491 Driver Propagation Delay Figure 17.MAX3483/MAX3488 Driver Propagation Delay Figure 16.MAX3485/MAX3490/MAX3491 Receiver Propagation Delay Driven by External RS-485 DeviceFigure 18.MAX3483/MAX3488 Receiver Propagation DelayFigure 19. MAX3483/MAX3488 System Differential Voltage at 125kHz Driving 4000 ft of Cable Figure 20. MAX3485/MAX3490/MAX3491 System Differential Voltage at 125kHz Driving 4000 ft of CableDriver Output Protection Excessive output current and power dissipation caused by faults or by bus contention are prevented by two mechanisms. A foldback current limit on the output stage provides immediate protection against short circuits over the whole common-mode voltage range (see Typical Operating Characteristics). In addition, a thermal shut-down circuit forces the driver outputs into a high-imped-ance state if the die temperature rises excessively.Propagation Delay Figures 15–18 show the typical propagation delays. Skew time is simply the difference between the low-to-high and high-to-low propagation delay. Small driver/receiver skew times help maintain a symmetrical mark-space ratio (50% duty cycle).The receiver skew time, |t PRLH- t PRHL|, is under 10ns (20ns for the MAX3483/MAX3488). The driver skew times are 8ns for the MAX3485/MAX3490/MAX3491, 11ns for the MAX3486, and typically under 100ns for the MAX3483/MAX3488.Line Length vs. Data Rate The RS-485/RS-422 standard covers line lengths up to 4000 feet. For line lengths greater than 4000 feet, see Figure 23.Figures 19 and 20 show the system differential voltage for parts driving 4000 feet of 26AWG twisted-pair wire at 125kHz into 120Ωloads.Typical Applications The MAX3483, MAX3485, MAX3486, MAX3488, MAX3490, and MAX3491 transceivers are designed for bidirectional data communications on multipoint bus transmission lines. Figures 21 and 22 show typical net-work applications circuits. These parts can also be used as line repeaters, with cable lengths longer than 4000 feet, as shown in Figure 23.To minimize reflections, the line should be terminated at both ends in its characteristic impedance, and stub lengths off the main line should be kept as short as possible. The slew-rate-limited MAX3483/MAX3488 and the partially slew-rate-limited MAX3486 are more tolerant of imperfect termination.Figure 21.MAX3483/MAX3485/MAX3486 Typical RS-485 NetworkMAX3483/MAX3485/MAX3486/MAX3488/MAX3490/MAX3491True RS-485/RS-422 Transceivers ______________________________________________________________________________________13M A X 3483/M A X 3485/M A X 3486/M A X 3488/M A X 3490/M A X 3491True RS-485/RS-422 Transceivers14______________________________________________________________________________________Figure 22.MAX3488/MAX3490/MAX3491 Full-Duplex RS-485 NetworkFigure 23.Line Repeater for MAX3488/MAX3490/MAX3491MAX3483/MAX3485/MAX3486/MAX3488/MAX3490/MAX3491True RS-485/RS-422 Transceivers______________________________________________________________________________________15TRANSISTOR COUNT: 810SUBSTRATE CONNECTED TO GROUND__________________Chip Topography_Ordering Information (continued)* Contact factory for for dice specifications.0.146" (3.71mm)0.086" (2.18mm)Z/BB AY/AGNDDIDE REROVCCGNDM A X 3483/M A X 3485/M A X 3486/M A X 3488/M A X 3490/M A X 3491True RS-485/RS-422 TransceiversMaxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses areimplied. Maxim reserves the right to change the circuitry and specifications without notice at any time.16__________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 (408) 737-7600©1994 Maxim Integrated ProductsPrinted USAis a registered trademark of Maxim Integrated Products.________________________________________________________Package Information。
max3485中文资料
MAX3483，MAX3485，MAX3486，MAX3488，MAX3490以及MAX3491是用于RS-485与RS-422通信的3.3V，低功耗收发器，每个器件中都具有一个驱动器和一个接收器。
MAX3483和MAX3488具有限摆率驱动器，可以减小EMI，并降低由不恰当的终端匹配电缆引起的反射，实现最高250kbps的无差错数据传输。
MAX3486的驱动器摆率部分受限，可以实现最高2.5Mbps的传输速率。
MAX3485，MAX3490和MAX3491则可以实现最高10Mbps 的传输速率。
驱动器具有短路电流限制，并可以通过热关断电路将驱动器输出置为高阻状态，防止过度的功率损耗。
接收器输入具有失效保护特性，当输入开路时，可以确保逻辑高电平输出。
特性●半双工●速率：10Mbps●限摆率：NO●接收允许控制：YES●关断电流：2nA●引脚数：8参数暂无MAX3485的参数信息引脚图与功能MAX3485ESA品牌厂家：Maxim Integrated（美信），MAX3485ESA 渠道分销商：2家，现货库存数量：1542 PCS，MAX3485ESA价格参考：¥8.121元。
Maxim Integrated（美信）MAX3485ESA参数（SOIC 8Pin 3V 10Mbps，封装：SOIC），MAX3485ESA中文资料和引脚图及功能表说明书PDF下载（17页，409KB），您可以在MAX3485ESA接口芯片规格书Datesheet数据手册中，查到MAX3485ESA引脚图及功能的应用电路图电压和使用方法，MAX3485ESA典型电路教程。
MAX3485ESA可以用什么代替？代换型号如：MAX3485CSA+T、MAX3485CSA替代换，MAX3485ESA芯片系列中文手册中包含MAX3485ESA各引脚定义说明介绍及MAX3485ESA引脚功能图解，用户中文手册MAX3485ESA芯片手册PDF下载（17页，409KB）。
MAX471MAX472的中文资料大全
MAX471/MAX472的特点、功能美国美信公司生产的精密高端电流检测放大器是一个系列化产品，有MAX471/MAX472、MAX4172/MAX4173等。
它们均有一个电流输出端，可以用一个电阻来简单地实现以地为参考点的电流/电压的转换，并可工作在较宽电压内。
MAX471/MAX472具有如下特点：●具有完美的高端电流检测功能；●内含精密的内部检测电阻（MAX471）；●在工作温度范围内，其精度为2%；●具有双向检测指示，可监控充电和放电状态；●内部检测电阻和检测能力为3A，并联使用时还可扩大检测电流范围；●使用外部检测电阻可任意扩展检测电流范围（MAX472）；●最大电源电流为100μA；●关闭方式时的电流仅为5μA；●电压范围为3～36V；●采用8脚DIP/SO/STO三种封装形式。
MAX471/MAX472的引脚排列如图1所示，图2所示为其内部功能框图。
表1为MAX471/MAX472的引脚功能说明。
MAX471的电流增益比已预设为500μA/A，由于2kΩ的输出电阻（ROUT）可产生1V/A的转换，因此±3A时的满度值为3V.用不同的ROUT电阻可设置不同的满度电压。
但对于MAX471，其输出电压不应大于VRS+。
对于MAX472，则不能大于。
MAX471引脚图如图１所示，MAX472引脚图如图２所示。
MAX471/MAX472的引脚功能说明引脚名称功能MAX471MAX47211SHDN关闭端。
正常运用时连接到地。
当此端接高电平时，电源电流小于5μA2，3-RS+内部电流检测电阻电池（或电源端）。
“+”仅指示与SIGN输出有关的流动方向。
封装时已将2和3连在了一起-2空脚88OUT 电流输出，它正比于流过TSENSE被测电路的幅度，在MAX741中，此引脚到地之间应接一个2kΩ电阻，每一安培被测电流将产生大小等于1V的电压OUT端为电流幅度输出端，而SIGN端可用来指示输出电流的方向。
MAX3490摘出资料(部分中文)
MAX3488，MAX3490，MAX3491功能，全双工通信，而MAX3483，MAX3485，MAX3486是专为半双工通信。
单一的3.3V电源供应，没有电荷注入；具有＋5V逻辑电源互操作；最大偏斜为8ns；2ns低电流掉电模式；共模输入电压范围：－7～＋12V，总线上允许多达32个收发器；全双工和半双工版本；具有电流限制和热关机驱动器过载保护
驱动器具有短路电流限制和对功耗过大的保护，热关断电路，驱动器输出置于高阻抗状态。
接收器输入具有故障安全功能，保证逻辑高输出，如果两个输入端开路。
选择MAX3490做RS-422，下图为MAX3490引脚图
1——VCC 3.3V
2——RO 接收器输出
3——DI 驱动器输入
4——GND
5——Y 同相驱动器输出
6——Z 反相驱动器输出
7——B 反相接收器输入
8——A 同相接收器输入
保证数据传输速率（Mbps）10
电源电压（V） 3.0 to 3.6
半/全双工全双工
摆率限制无
驱动器/接收器使无
关断电流（NA）关断时无
引脚数8
频率大，高频谐波明显
MAX3490没有接收器发送器使能，控制逻辑如下图
MAX3490（无RE、DE引脚）绝对最大额定值如下图：
MAX3490驱动器的开关特性如下图：
MAX3490型号及封装如下图
MAX3490引脚配置与典型工作电路，如下图
MAX3490封装尺寸。
MAX6323-MAX6324中文资料
SUFFIX
FAST
MAX
UNITS
SLOW
MIN
UNITS
A
1.5
ms
10
B
15
ms
100
ms
C
15
ms
300
D
15
ms
10
s
E
15
ms
60
F
23
ms
47
ms
G
39
ms
82
H
719
ms
1.3
s
*See Figure 1 for operation.
________________________________________________________________ Maxim Integrated Products 1
Medical
Embedded Control Systems
Features
♦ Min/Max (Windowed) Watchdog, 8 Factory-Trimmed Timing Options
♦ Pulsed Open-Drain, Active-Low Watchdog Output ♦ Power-On Reset ♦ Precision Monitoring of +2.5V, +3.0V, +3.3V,
众智smartgenHGM6310G6320G控制器说明书
HGM6310G/6320G控制器用户手册郑州众智电子设备有限公司目录一、概述 (3)二、性能及特点 (3)三、技术参数 (5)四、操作 (6)1.按键功能描述 (6)2.自动开机停机操作 (6)3.手动开机停机操作 (7)4.短信遥控功能描述 (8)5.历史记录查询 (9)五、保护 (10)1.警告 (10)2.停机报警 (11)3.跳闸报警 (12)4.短信报警项目 (13)六、接线 (14)七、参数设置 (17)1.参数设置内容及范围一览表 (17)2.可编程输出口1－6可定义内容一览表 (21)3.可编程输入口1-6定义内容一览表 (23)4.自定义项目名称一览表 (24)5.传感器选择一览表 (25)6.起动成功条件选择一览表 (26)八、试运行 (27)九、典型应用 (28)十、安装 (30)十一、常见故障及排除方法 (31)十二、产品的成套 (32)一、概述HGM6310G/6320G发电机组自动化控制器集成了数字化、智能化、网络化技术，Z。
用于单台柴油发电机组自动化及监控系统，实现发电机组的自动开机／停机、数据测量、报警保护及“三遥”功能。
控制器采用大屏幕液晶（LCD）显示，中英文可选界面操作，操作简单，运行可靠。
HGM6310G/6320G发电机组自动化控制器采用微处理器技术，实现了多种参数的精密测量、定值调节以及定时、阈值整定等功能，既可从控制器前面板调整，又可使用PC机通过RS485接口调整及监测。
其结构紧凑、接线简单，可靠性高，可广泛应用于各类型发电机组自动化系统。
二、性能及特点➢HGM6300G系列分两种型号：◎HGM6310G：用于单机自动化；◎HGM6320G：在HGM6310G基础上增加了市电电量监测和市电/发电自动切换控制功能，特别适用于一市一机构成的单机自动化系统。
➢以微处理器为核心，大屏幕LCD带背光、可选中英文显示，轻触按钮操作；➢供电电源范围宽(8~35)VDC，能适应12/24V起动电池电压环境；➢具备双水温、双油压传感器输入。
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General DescriptionThe MAX6314 low-power CMOS microprocessor (µP)supervisory circuit is designed to monitor power supplies in µP and digital systems. The MAX6314’s RESET output is bidirectional, allowing it to be directly connected to µPs with bidirectional reset inputs, such as the 68HC11. It provides excellent circuit reliability and low cost by eliminating external components and adjustments. The MAX6314 also provides a debounced manual reset input.This device performs a single function: it asserts a reset signal whenever the V CC supply voltage falls below a preset threshold or whenever manual reset is asserted.Reset remains asserted for an internally programmed interval (reset timeout period) after V CC has risen above the reset threshold or manual reset is deasserted.The MAX6314 comes with factory-trimmed reset threshold voltages in 100mV increments from 2.5V to 5V. Preset timeout periods of 1ms, 20ms, 140ms,and 1120ms (minimum) are also available. The device comes in a SOT143 package.F or a µP supervisor with an open-drain reset pin, see the MAX6315 data sheet.________________________ApplicationsComputers ControllersIntelligent InstrumentsCritical µP and µC Power Monitoring Portable/Battery-Powered EquipmentFeatures♦Small SOT143 Package♦RESET Output Simplifies Interface to Bidirectional Reset I/Os♦Precision Factory-Set V CC Reset Thresholds:100mV Increments from 2.5V to 5V♦±1.8% Reset Threshold Accuracy at T A = +25°C ♦±2.5% Reset Threshold Accuracy Over Temp.♦Four Reset Timeout Periods Available: 1ms, 20ms, 140ms, or 1120ms (minimum) ♦Immune to Short V CC Transients ♦5µA Supply Current♦Pin-Compatible with MAX811MAX6314*68HC11/Bidirectional-CompatibleµP Reset Circuit________________________________________________________________Maxim Integrated Products1Pin ConfigurationTypical Operating Circuit19-1090; Rev 2; 12/05Ordering Information continued at end of data sheet.*Patents PendingFor pricing, delivery, and ordering information,please contact Maxim/Dallas Direct!at 1-888-629-4642, or visit Maxim’s website at .Ordering Information†The MAX6314 is available in a SOT143 package, -40°C to+85°C temperature range.††The first two letters in the package top mark identify the part,while the remaining two letters are the lot tracking code.Devices are available in both leaded and lead-free packaging.Specify lead-free by replacing “-T” with “+T” when ordering.M A X 631468HC11/Bidirectional-Compatible µP Reset Circuit 2_______________________________________________________________________________________ABSOLUTE MAXIMUM RATINGSELECTRICAL CHARACTERISTICS(V CC = +2.5V to +5.5V, T A = -40°C to +85°C, unless otherwise noted. Typical values are at T A = +25°C.)Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.Note 1:The MAX6314 monitors V CC through an internal, factory-trimmed voltage divider that programs the nominal reset threshold.Factory-trimmed reset thresholds are available in 100mV increments from 2.5V to 5V (see Ordering and Marking Information ).Note 2:This is the minimum time RESET must be held low by an external pull-down source to set the active pull-up flip-flop.Note 3:Measured from RESET V OL to (0.8 x V CC ), R LOAD = ∞.V CC ........................................................................-0.3V to +6.0V All Other Pins..............................................-0.3V to (V CC + 0.3V)Input Current (V CC ).............................................................20mA Output Current (RESET )......................................................20mA Rate of Rise (V CC )...........................................................100V/µsContinuous Power Dissipation (T A = +70°C)SOT143 (derate 4mW/°C above +70°C).......................320mW Operating Temperature Range ...........................-40°C to +85°C Storage Temperature Range.............................-65°C to +160°C Lead Temperature (soldering, 10sec).............................+300°CMAX631468HC11/Bidirectional-CompatibleµP Reset Circuit_______________________________________________________________________________________3__________________________________________Typical Operating Characteristics(T A = +25°C, unless otherwise noted.)4.7k Ω PULL-UP 2V/divMAX6314 PULL-UP 2V/divINPUT 5V/div200ns/divPULLUP CHARACTERISTICS100pF4.7k Ω+5V74HC0574HC05V CCGNDMR 100pF+5VRESETMAX63146-50-303090SUPPLY CURRENT vs. TEMPERATURE215TEMPERATURE (°C)S U P P L Y C U R R E N T (µA )-101050347060135SUPPLY CURRENT vs. SUPPLY VOLTAGE215SUPPLY VOLTAGE (V)S U P P L Y C U R R E N T (µA )2344500-50-301090POWER-DOWN RESET DELAYvs. TEMPERATURE1040TEMPERATURE (°C)P O W E R -D O W N R E S E T D E L A Y (µs )-1020303050701.040.96-50-301090NORMALIZED RESET TIMEOUT PERIOD vs. TEMPERATURE (V CC RISING)0.970.981.021.001.03M A X 6314-05TEMPERATURE (°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 D -100.991.013050701.0060.994-50-301090NORMALIZED RESET THRESHOLD vs. TEMPERATURE (V CC FALLING)0.9960.9981.0041.000M A X 6314-06TEMPERATURE (°C)N O R M A L I Z E D R E S E T T H R E S H O L D-101.0023050701000101001000MAXIMUM TRANSIENT DURATION vs. RESET COMPARATOR OVERDRIVE20RESET COMP. 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 )4060806000-50-301090RESET PULLUP TIME vs. TEMPERATURE100200500300TEMPERATURE (°C)R E S E T P U L L -U P -T I M E (n s )-10400305070Figure 1. Functional Diagram M A X 631468HC11/Bidirectional-Compatible µP Reset Circuit 4_____________________________________________________________________________________________________________________________________________________Pin DescriptionSupply Voltage and Reset Threshold Monitor InputV CC4Manual Reset Input. A logic low on MR asserts reset. Reset remains asserted as long as MR is low, and for the reset timeout period (t RP ) after the reset conditions are terminated. Connect to V CC if not used.MR 3PIN Active-Low Complementary Output. In addition to the normal n-channel pulldown, RESET has a p-channel pullup transistor in parallel with a 4.7k Ωresistor to facilitate connection to µPs with bidirectional resets. See the Reset Output section.RESET2GroundGND 1FUNCTIONNAMEMAX631468HC11/Bidirectional-CompatibleµP Reset Circuit_______________________________________________________________________________________5Detailed DescriptionThe MAX6314 has a reset output consisting of a 4.7k Ωpull-up resistor in parallel with a P-channel transistor and an N-channel pull down (Figure 1), allowing this IC to directly interface with microprocessors (µPs) that have bidirectional reset pins (see the Reset Output section).Reset OutputA µP’s reset input starts the µP in a known state. The MAX6314 asserts reset to prevent code-execution errors during power-up, power-down, or brownout conditions. RESET is guaranteed to be a logic low for V CC > 1V (see the Electrical Characteristics table).Once V CC exceeds the reset threshold, the internal timer keeps reset asserted for the reset timeout period (t RP ); after this interval RESET goes high. If a brownout condition occurs (monitored voltage dips below its pro-grammed reset threshold), RESET goes low. Any time V CC dips below the reset threshold, the internal timer resets to zero and RESET goes low. The internal timer starts when V CC returns above the reset threshold, and RESET remains low for the reset timeout period.The MAX6314’s RESET output is designed to interface with µPs that have bidirectional reset pins, such as the Motorola 68HC11. Like an open-drain output, the MAX6314 allows the µP or other devices to pull RESET low and assert a reset condition. However, unlike a standard open-drain output, it includes the commonly specified 4.7k Ωpullup resistor with a P-channel active pullup in parallel.This configuration allows the MAX6314 to solve a prob-lem associated with µPs that have bidirectional reset pins in systems where several devices connect to RESET . These µPs can often determine if a reset was asserted by an external device (i.e., the supervisor IC)or by the µP itself (due to a watchdog fault, clock error,or other source), and then jump to a vector appropriate for the source of the reset. However, if the µP does assert reset, it does not retain the information, but must determine the cause after the reset has occurred.The following procedure describes how this is done with the Motorola 68HC11. In all cases of reset, the µP pulls RESET low for about four E-clock cycles. It then releases RESET , waits for two E-clock cycles, then checks RESET ’s state. If RESET is still low, the µP con-cludes that the source of the reset was external and,when RESET eventually reaches the high state, jumps to the normal reset vector. In this case, stored state information is erased and processing begins fromscratch. If, on the other hand, RESET is high after the two E-clock cycle delay, the processor knows that it caused the reset itself and can jump to a different vec-tor and use stored state information to determine what caused the reset.The problem occurs with faster µPs; two E-clock cycles is only 500ns at 4MHz. When there are several devices on the reset line, the input capacitance and stray capacitance can prevent RESET from reaching the logic-high state (0.8 x V CC ) in the allowed time if only a passive pullup resistor is used. In this case, all resets will be interpreted as external. The µP is guaranteed to sink only 1.6mA, so the rise time cannot be much reduced by decreasing the recommended 4.7k Ωpullup resistance.The MAX6314 solves this problem by including a pullup transistor in parallel with the recommended 4.7k Ωresis-tor (Figure 1). The pullup resistor holds the output high until RESET is forced low by the µP reset I/O, or by the MAX6314 itself. Once RESET goes below 0.5V, a com-parator sets the transition edge flip-flop, indicating that the next transition for RESET will be low to high. As soon as RESET is released, the 4.7k Ωresistor pulls RESET up toward V CC . When RESET rises above 0.5V,the active p-channel pullup turns on for the 2µs duration of the one-shot. The parallel combination of the 4.7k Ωpullup and the p-channel transistor on-resistance quickly charges stray capacitance on the reset line, allowing RESET to transition low to high with-in the required two E-clock period, even with several devices on the reset line (Figure 2). Once the one-shot times out, the p-channel transistor turns off. This process occurs regardless of whether the reset was caused by V CC dipping below the reset threshold, MR being asserted, or the µP or other device asserting RESET . Because the MAX6314 includes the standard 4.7k Ωpullup resistor, no external pullup resistor is required. To minimize current consumption, the internal pullup resistor is disconnected whenever the MAX6314asserts RESET .Manual Reset InputMany 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 after MR returns high. To minimize current consumption, the internal 4.7k Ωpullup resistor on RESET is disconnected whenever RESET is asserted.M A X 631468HC11/Bidirectional-Compatible µP Reset Circuit 6_______________________________________________________________________________________MR has an internal 63k Ωpullup resistor, so it can be left open if not used. Connect a normally open momen-tary switch from MR to GND 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 environment, connecting a 0.1µF capacitor from MR to ground provides additional noise immunity.__________Applications InformationNegative-Going V CC TransientsIn addition to issuing a reset to the µP during power-up,power-down, and brownout conditions, these devices are relatively immune to short-duration negative-going transients (glitches). The T ypical Operating Character-istics show the Maximum Transient Duration vs. Reset Threshold Overdrive, for which reset pulses are not generated. The graph was produced using negative-going pulses, starting at V RST max and ending below the programmed reset threshold by the magnitude indicated (reset threshold overdrive). The graph shows the maximum pulse width that a negative-going V CC transient may typically have without causing a reset pulse to be issued. As the amplitude of the transient increases (i.e., goes farther below the reset threshold),the maximum allowable pulse width decreases. A 0.1µF bypass capacitor mounted close to V CC provides addi-tional transient immunity.Ensuring a Valid RESET OutputDown to V CC = 0VWhen V CC falls below 1V, RESET no longer sinks current—it becomes an open circuit. Therefore, high-impedance CMOS-logic inputs connected to RESET can drift to undetermined voltages. This presents no problem in most applications, since most µP and other circuitry is inoperative with V CC below 1V. However, in applications where RESET must be valid down to V CC = 0V, adding a pull-down resistor to RESET will cause any stray leakage currents to flow to ground,holding RESET low (Figure 3). R1’s value is not critical;100k Ωis large enough not to load RESET and small enough to pull RESET to ground.Figure 2. MAX6314 Supports Additional Devices on the Reset BusFigure 3. RESET Valid to V CC = Ground CircuitMAX631468HC11/Bidirectional-CompatibleµP Reset Circuit_______________________________________________________________________________________7Figure 4. RESET Timing Diagram†The MAX6314 is available in a SOT143 package, -40°C to +85°C temperature range.††The first two letters in the package top mark identify the part, while the remaining two letters are the lot tracking code.†††Sample stocks generally held on the bolded products; also, the bolded products have 2,500 piece minimum-order quantities.Non-bolded products have 10,000 piece minimum-order quantities. Contact factory for details.Devices are available in both leaded and lead-free packaging. Specify lead-free by replacing “-T” with “+T” when ordering.Note:All devices available in tape-and-reel only. Contact factory for availability.___________________________________________Ordering Information (continued)M A X 631468HC11/Bidirectional-Compatible µP Reset Circuit 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.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._____________________________Ordering and Marking Information (continued)†The MAX6314 is available in a SOT143 package, -40°C to +85°C temperature range.††The first two letters in the package top mark identify the part, while the remaining two letters are the lot tracking code.†††Sample stocks generally held on the bolded products; also, the bolded products have 2,500 piece minimum-order quantities.Non-bolded products have 10,000 piece minimum-order quantities. Contact factory for details.Devices are available in both leaded and lead-free packaging. Specify lead-free by replacing “-T” with “+T” when ordering.Note:All devices available in tape-and-reel only. Contact factory for availability.Chip InformationTRANSISTOR COUNT: 519Package InformationFor the latest package outline information, go to /packages .。