毕业设计参考文献max485中文资料

1、19-0122; Rev 8; 10/03海纳电子资讯网： 低功耗、限摆率、 RS-485/RS-422收发器 MAX481/MAX483/MAX485/MAX487MAX491/MAX1487 概述 下一代器件的特性 MAX481、MAX483、MAX485、MAX487-MAX491以及 MAX1487是用于RS-485与RS-422通信的低功耗收发器， 每个器件中都具有一个驱动器和一个 。MAX483、MAX487、MAX488以及MAX489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

2、数据传输。M A X 4 8 1 、MAX485、MAX490、MAX491、MAX1487 的驱动器摆 率不受限制，可以实现最高2.5Mbps的传输速率。 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 120( A 至 500( A 之间。另外， MAX481 、MAX483 与MAX487 具有低电流关断模式， 仅消耗0.1A。所有器件都工作在5V单电源下。 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。 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。 MAX487与MAX1487具有四分之一单位负载的 输入阻抗， 使

3、得总线上最多可以有 128 个 MAX487/ MAX1487收发器。使用MAX488-MAX491可以实现全双工通信，而MAX481、MAX483、MAX485、MAX487与 MAX1487则为半双工应用设计。 应用 低功耗RS-485收发器低功耗RS-422收发器电平转换器 用于EMI敏感应用的收发器工业控制局域网 容错应用 MAX3430: 80V故障保护、失效保护、1/4单位负载、+3.3V、RS-485收发器 MAX3440E-MAX3444E: 15kV ESD保护、60V故障保护、10Mbps、失效保护、 RS-485/J1708收发器 对于空间受限应用 MAX3460-MAX

4、3464: +5V、失效保护、20Mbps、Profibus RS-485/RS-422收发器 MAX3362: +3.3V、高速、RS-485/RS-422收发器， 采用SOT23封装 MAX3280E-MAX3284E: 15kV ESD保护、 52Mbps、+3V至+5.5V、SOT23、RS-485/RS-422、真失效保护 MAX3293/MAX3294/MAX3295: 20Mbps、+3.3V、SOT23、RS-485/RS-422发送器 对于多通道收发器应用 MAX3030E-MAX3033E: 15kV ESD保护、 +3.3V、四路RS-422发送器 对于失效保护应用 MA

5、X3080-MAX3089: 失效保护、高速(10Mbps)、限摆率RS-485/RS-422收发器 对于低电压应用 MAX3483E/MAX3485E/MAX3486E/MAX3488E/ MAX3490E/MAX3491E: +3.3V供电、15kV ESD保护、12Mbps、限摆率、真正的RS-485/RS-422 收发器 定购信息在本资料的最后给出。 选择表 PART NUMBERHALF/FULL DUPLEXDATA RATE(Mbps)SLEW-RATE LIMITEDLOW-POWER SHUTDOWNRECEIVER/ DRIVER ENABLEQUIESCENT CURRE

6、NT (mA)NUMBER OF TRANSMITTERS ON BUSPIN COUNTMAX481Half2.5NoYesYes300328MAX483Half0.25YesYesYes120328MAX485Half2.5NoNoYes300328MAX487Half0.25YesYesYes1201288MAX488Full0.25YesNoNo120328MAX489Full0.25YesNoYes1203214MAX490Full2.5NoNoNo300328MAX491Full2.5NoNoYes3003214MAX1487Half2.5NoNoYes2301288 Maxim

7、Integrated Products 1本文是 Maxim正式英文资料的译文，Maxim不对翻译中存在的差异或由此产生的错误负责。请注意译文中可能存在文字组织或翻译错误，如需确认任何词语的准确性，请参考 Maxim提供的英文版资料。 索取免费样品和最新版的数据资料，请访问 Maxim的主页：。 海纳电子资讯网： 7低功耗、限摆率、 RS-485/RS-422收发器 ABSOLUTE MAXIMUM RATINGSSupply Voltage (VCC)VControl Input Voltage(RE, DE)0.5V

8、to (VCC + 0.5V)Driver Input Voltage (DI)0.5V to (VCC + 0.5V)Driver Output Voltage (A, B).-8V to+12.5VReceiver Input Voltage (A, B).-8V to+12.5VReceiver Output Voltage (RO)0.5V to (VCC +0.5V)Continuous Power Dissipation (TA = +70C)8-Pin Plastic DIP (derate 9.09mW/C above +70C)727mW14-Pin Plastic DIP

9、(derate 10.00mW/C above +70C) .800mW 8-P O (derate 5.88mW/Cabove +70C)471mW14-P O (derate 8.33mW/Cabove +70C)667mW8-Pin MAX (derate 4.1mW/C above +70C)830mW8-Pin CERDIP (derate 8.00mW/C above +70C)640mW14-Pin CERDIP (derate 9.09mW/C above +70C)727mWOperating Temperature RangesMAX4_ _C_ _/MAX1487C_ A

10、 . 0C to +70CMAX4_ _E_ _/MAX1487E_ A . .-40C to +85CMAX4_ _MJ_/MAX1487MJA.-55C to +125CStorage Temperature Range.-65C to +160CLead Temperature (soldering, 10sec)+300C1, 2)MAX481/MAX483/MAX485/MAX487MAX491/MAX1487Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage

11、 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 reliab

12、ility.DC ELECTRICAL CHARACTERISTICS(VCC = 5V 5%, TA = TMIN to TMAX, unless otherwise noted.) (NotesPARAMETERSYMBOLCONDITIONSMINTYPMAXUNITSDifferential Driver Output (no load)VOD15VDifferential Driver Output (with load)VOD2R = 50W (RS-422)2VR = 27W (RS-485), Figure 41.55Change in Magnitude of Driver

13、Differential Output Voltage for Complementary Output StatesDVODR = 27W or 50W, Figure 40.2VDriver Common-Mode Output VoltageVOCR = 27W or 50W, Figure 43VChange in Magnitude of Driver Common-Mode Output Voltage for Complementary Output StatesDVODR = 27W or 50W, Figure 40.2VInput High VoltageVIHDE, DI

14、, RE2.0VInput Low VoltageVILDE, DI, RE0.8VInput CurrentIIN1DE, DI, RE2AInput Current (A, B)IIN2DE = 0V;VCC = 0V or 5.25V,all devices except MAX487/MAX1487VIN = 12V1.0mAVIN = -7V-0.8MAX487/MAX1487,DE = 0V, VCC = 0V or 5.25VVIN = 12V0.25mAVIN = -7V-0.2Receiver Differential Threshold VoltageVTH-7V VCM

15、12V-0.20.2VReceiver Input HysteresisDVTHVCM = 0V70mVReceiver Output High VoltageVOHIO = -4mA, VID = 200mV3.5VReceiver Output Low VoltageVOLIO = 4mA, VID = -200mV0.4VThree-State (high impedance) Output Current at ReceiverIOZR0.4V VO 2.4V1AReceiver Input ResistanceRIN-7V VCM 12V, all devices except MA

16、X487/MAX148712kW-7V VCM 12V, MAX487/MAX148748kWDC ELECTRICAL CHARACTERISTICS (continued)(VCC = 5V 5%, TA = TMIN to TMAX, unless otherwise noted.) (Notes 1, 2)低功耗、限摆率、 RS-485/RS-422收发器 PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS MAX488/MAX489,DE, DI, RE = 0V or VCC120250 No-Load Supply Current (Note 3) I

17、CCMAX490/MAX491,DE, DI, RE = 0V or VCC300500 AMAX481/MAX485, RE = 0V or VCCDE = VCC500900DE = 0V300500DE = VCC300500MAX1487,RE = 0V or VCCDE = 0V230400MAX483/MAX487,DE = 5VMAX483350650MAX487250400RE = 0V or VCCDE = 0V120250Supply CurrenthutdownISHDNMAX481/483/487, DE = 0V, RE = VCC0.110ADriver Short

18、-Circuit Current, VO = HighIOSD1-7V VO 12V (Note 4)35250mADriver Short-Circuit Current, VO = LowIOSD2-7V VO 12V (Note 4)35250mAReceiver Short-Circuit CurrentIOSR0V VO VCC795mAMAX481/MAX483/MAX485/MAX487MAX491/MAX1487SWITCHING CHARACTERISTICSMAX481/MAX485, MAX490/MAX491, MAX1487(VCC = 5V 5%, TA = TMI

19、N to TMAX, unless otherwise noted.) (Notes 1, 2)PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITSDriver Input to OutputtPLHFigures 6 and 8, RDIFF = 54W, CL1 = CL2 = 100pF103060nstPHL103060Driver Output Skew to OutputtSKEWFigures 6 and 8, RDIFF = 54W, CL1 = CL2 = 100pF510nsDriver Rise or Fall TimetR, tFFigures

20、 6 and 8, RDIFF = 54W,CL1 = CL2 = 100pFMAX481, MAX485,MAX148731540nsMAX490C/E, MAX491C/E51525MAX490M, MAX491M31540Driver Enable to Output HightZHFigures 7 and 9, CL = 100pF, S2 closed4070nsDriver Enable to Output LowtZLFigures 7 and 9, CL = 100pF, S1 closed4070nsDriver Disable Time from LowtLZFigure

21、s 7 and 9, CL = 15pF, S1 closed4070nsDriver Disable Time from HightHZFigures 7 and 9, CL = 15pF, S2 closed4070nsReceiver Input to OutputtPLH, tPHLFigures 6 and 10, RDIFF = 54W,CL1 = CL2 = 100pFMAX481, MAX485,MAsMAX490C/E, MAX491C/E2090150MAX490M, MAX491M2090200| tPLH - tPHL | Differenti

22、al Receiver SkewtSKDFigures 6 and 10, RDIFF = 54W, CL1 = CL2 = 100pF13nsReceiver Enable to Output LowtZLFigures 5 and 11, CRL = 15pF, S1 closed2050nsReceiver Enable to Output HightZHFigures 5 and 11, CRL = 15pF, S2 closed2050nsReceiver Disable Time from LowtLZFigures 5 and 11, CRL = 15pF, S1 closed2

23、050nsReceiver Disable Time from HightHZFigures 5 and 11, CRL = 15pF, S2 closed2050nsMaximum Data RatefMAX2.5MbpsTime to ShutdowntSHDNMAX481 (Note 5)50200600nsMAX481/MAX483/MAX485/MAX487MAX491/MAX1487低功耗、限摆率、 RS-485/RS-422收发器 SWITCHING CHARACTERISTICSMAX481/MAX485, MAX490/MAX491, MAX1487 (continued)(

24、VCC = 5V 5%, TA = TMIN to TMAX, unless otherwise noted.) (Notes 1, 2)PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITSDriver Enable from Shutdown to Output High (MAX481)tZH(SHDN)Figures 7 and 9, CL = 100pF, S2 closed40100nsDriver Enable from Shutdown to Output Low (MAX481)tZL(SHDN)Figures 7 and 9, CL = 100pF,

25、 S1 closed40100nsReceiver Enable from Shutdown to Output High (MAX481)tZH(SHDN)Figures 5 and 11, CL = 15pF, S2 closed, A - B = 2V3001000nsReceiver Enable from Shutdown to Output Low (MAX481)tZL(SHDN)Figures 5 and 11, CL = 15pF, S1 closed, B - A = 2V3001000nsSWITCHING CHARACTERISTICSMAX483, MAX487/MA

26、X488/MAX489(VCC = 5V 5%, TA = TMIN to TMAX, unless otherwise noted.) (Notes 1, 2)PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITSDriver Input to OutputtPLHFigures 6 and 8, RDIFF = 54W, CL1 = CL2 = 100pF2508002000nstPHL2508002000Driver Output Skew to OutputtSKEWFigures 6 and 8, RDIFF = 54W, CL1 = CL2 = 100pF1

27、00800nsDriver Rise or Fall TimetR, tFFigures 6 and 8, RDIFF = 54W, CL1 = CL2 = 100pF2502000nsDriver Enable to Output HightZHFigures 7 and 9, CL = 100pF, S2 closed2502000nsDriver Enable to Output LowtZLFigures 7 and 9, CL = 100pF, S1 closed2502000nsDriver Disable Time from LowtLZFigures 7 and 9, CL =

28、 15pF, S1 closed3003000nsDriver Disable Time from HightHZFigures 7 and 9, CL = 15pF, S2 closed3003000nsReceiver Input to OutputtPLHFigures 6 and 10, RDIFF = 54W, CL1 = CL2 = 100pF2502000nstPHL2502000I tPLH - tPHL I Differential Receiver SkewtSKDFigures 6 and 10, RDIFF = 54W, CL1 = CL2 = 100pF100nsRe

29、ceiver Enable to Output LowtZLFigures 5 and 11, CRL = 15pF, S1 closed2050nsReceiver Enable to Output HightZHFigures 5 and 11, CRL = 15pF, S2 closed2050nsReceiver Disable Time from LowtLZFigures 5 and 11, CRL = 15pF, S1 closed2050nsReceiver Disable Time from HightHZFigures 5 and 11, CRL = 15pF, S2 cl

30、osed2050nsMaximum Data RatefMAXtPLH, tPHL 50% of data period250kbpsTime to ShutdowntSHDNMAX483/MAX487 (Note 5)50200600nsDriver Enable from Shutdown to Output HightZH(SHDN)MAX483/MAX487, Figures 7 and 9,CL = 100pF, S2 closed2000nsDriver Enable from Shutdown to Output LowtZL(SHDN)MAX483/MAX487, Figure

31、s 7 and 9, CL = 100pF, S1 closed2000nsReceiver Enable from Shutdown to Output HightZH(SHDN)MAX483/MAX487, Figures 5 and 11, CL = 15pF, S2 closed2500nsReceiver Enable from Shutdown to Output LowtZL(SHDN)MAX483/MAX487, Figures 5 and 11,CL = 15pF, S1 closed2500ns低功耗、限摆率、 RS-485/RS-422收发器 MAX481/MAX483/

32、MAX485/MAX487MAX491/MAX1487NOTES FOR ELECTRICAL/SWITCHING CHARACTERISTICSNote 1: All currents into device p are positive; all currents out of device p are negative. All voltages are referenced to devi ce ground unless otherwise specified.Note 2: All typical specifications are given for VCC = 5V and

33、TA = +25C.Note 3: Supply current specification is valid for loaded transmitters when DE = 0V.Note 4: Applies to peak current. See Typical Operating Characteristics.Note 5: The MAX481/MAX483/MAX487 are put into shutdown by bringing RE high and DE low. If the inputs are in this state for less than 50n

34、s, the parts are guaranteed not to enter shutdown. If the inputs are in this state for at least 600ns, the parts are guaranteed to have entered shutdown. See Low-Power Shutdown Mode section. 典型工作特性 (VCC = 5V, TA = +25C, unless otherwise noted.)OUTPUT CURRENT vs.RECEIVER OUTPUT LOW VOLTAGE4540OUTPUT

35、CURRENT(mA)35302520151050-20MAX481-01-18OUTPUT CURRENT(mA)-16-14-12-10-8-6-4-20OUTPUT CURRENT vs.RECEIVER OUTPUT HIGH VOLTAGEMAX481-024.8OUTPUT HIGH VOLTAGE (V)4.03.23.0RECEIVER OUTPUT HIGH VOLTAGE vs.MAX481-03TEMPERATUREIR = 8 A00.51.01.52.02.51.5 2.02.5 3.0 3.5 4.0 4.5 5.0-50 -25

36、0255075 100 125OUTPUT LOW VOLTAGE (V)OUTPUT HIGH VOLTAGE (V)TEMPERATURE (C)0.90.8OUTPUT LOW VOLTAGE (V)0.10RECEIVER OUTPUT LOW VOLTAGE vs.MAX481-06TEMPERATUREIRO = 8mADRIVER OUTPUT CURRENT vs. DIFFERENTIAL OUTPUT VOLTAGEMAX481-049080OUTPUT CURRENT(mA)7060504030201002.4MAX481-05DIFF

37、ERENTIAL OUTPUT VOLTAGE (V)2.01.61.5DRIVER DIFFERENTIAL OUTPUT VOLTAGE vs. TEMPERATURER = 54W-50 -250255075 100 1250 0.51.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5-50 -250255075 100125TEMPERATURE (C)DIFFERENTIAL OUTPUT VOLTAGE (V)TEMPERATURE (C)低功耗、限摆率、 RS-485/RS-422收发器 典型工作特性（续） (VCC = 5V, TA

38、 = +25C, unless otherwise noted.)OUTPUT CURRENT vs.DRIVER OUTPUT LOW VOLTAGEMAX481-07140-120OUTPUT CURRENT vs.DRIVER OUTPUT HIGH VOLTAGEMAX481-08600MAX481/MAX485/MAX490/MAX491 SUPPLY CURRENT vs. TEMPERATUREMAX481-11MAX481/MAX485; DE = VCC, RE = X120-100500100806040200024681012-80OUTPUT CURRENT(mA)-6

39、0-40-200-7 -6 -5 -4 -3-2 -1 0 12 3 4 5400SUPPLY CURRENT (mA)3002001000MAX485; DE = 0, RE = X, MAX481; DE = RE = 0 MAX490/MAX491; DE = RE = XMAX481; DE = 0, RE = VCC-50 -250255075 100125OUTPUT LOW VOLTAGE (V)MAX483/MAX487MAX489OUTPUT HIGH VOLTAGE (V)MAX1487TEMPERATURE (C)600SUPPLY CURRENT (mA)5004003

40、002001000SUPPLY CURRENT vs. TEMPERATUREMAX483; DE = VCC, RE = XMAX487; DE = VCC, RE = XMAX483/MAX487; DE = RE = 0, MAX488/MAX489; DE = RE = XMAX483/MAX487; DE = 0, RE = VCC-50 -250255075 100 125TEMPERATURE (C)MAX481-12600SUPPLY CURRENT (mA)5004003002001000SUPPLY CURRENT vs. TEMPERATUREMAX481-13MAX14

41、87; DE = VCC, RE = XMAX1487;DE= 0V,RE= X-60 -40 -20 0 20 40 60 80 100 120 140TEMPERATURE (C)MAX481/MAX483/MAX485/MAX487MAX491/MAX1487OUTPUT CURRENT (mA)If A B by 200mV, RO will be high;NAME NAMEPIN 引脚说明 引脚 名称 功能 MAX481/MAX483/ MAX485/MAX487/ MAX1487MAX488/ MAX490MAX489/ MAX491DIP/SOMAXDIP/SOMAXDIP/S

42、O13242RO输出：若A B 200mV，则RO为高电平； 若A B 200mV，则RO为低电平。 243RE输出使能。当RE为低电平时，RO有效； 当RE为高电平时，RO为高阻状态。 驱动器输出使能。DE变为高电平时，驱动器输出Y与Z有效； 当DE为低电平时，驱动器输出为高阻状态。 当驱动器输出有效时，器件被用作线驱动器。而高阻状态下， 若RE为低电平，则器件被用作线 。 354DE46355DI驱动器输入。DI上的低电平强制输出Y为低电平，而输出Z为高电平。 同理，DI上的高电平强制输出Y为高电平，而输出Z为低电平。 57466, 7GND地 579Y驱动器同相输出端 6810Z驱动器反

43、相输出端 68A同相输入端和驱动器同相输出端 8212A同相输入端 71B反相输入端和驱动器反相输出端 7111B反相输入端 821314VCC正电源：4.75V VCC 5.25V1, 8, 13N.C.未连接内部未连接 RS-485/RS-422收发器 TOP VIEWRO RE DEDIR D VCC B AGNDMAX481 MAX483 MAX485 MAX487 MAX1487DEDIP/SORO RE DEDIRVCC 7 B6ADDIBRtRtA B VCC ROREA GND DIDEDGNDRRORE mMAXNOTE: PIN LABELS Y AND Z ON TIMI

44、NG, TEST, AND WAVEFORMDIAGRAMS REFER TO P A AND B WHEN DE IS HIGH. TYPICAL OPERATING CIRCUIT SHOWN WITH DIP/SO PACKAGE.54328145637281MAX481/MAX483/MAX485/MAX487MAX491/MAX1487 182MAX481736MAX483MAX48545MAX487MAX1487图1. MAX481/MAX483/MAX485/MAX487/MAX1487引脚配置与典型工作电路 海纳电子资讯网： TOP VIEW8V