max485数据手册CN

MaximMaximMaximMaxim(A500(AMAX481MAX483MAX4870.1µA5VMAX487MAX1487128MAX487/MAX1487MAX488-MAX491MAX481MAX483MAX485MAX487MAX1487_______________________________RS-485RS-422EMI____________________♦MAX3430:±80V1/4+3.3VRS-485MAX3440E-MAX3444E:±15kVESD±60V10MbpsRS-485/J1708♦MAX3460-MAX3464:+5V20MbpsProfibusRS-485/RS-422MAX3362:+3.3VRS-485/RS-422SOT23MAX3280E-MAX3284E:±15kVESD52Mbps+3V+5.5VSOT23RS-485/RS-422MAX3293/MAX3294/MAX3295:20Mbps+3.3VSOT23RS-485/RS-422♦MAX3030E-MAX3033E:±15kVESD+3.3VRS-422♦MAX3080-MAX3089:(10Mbps)RS-485/RS-422♦MAX3483E/MAX3485E/MAX3486E/MAX3488E/MAX3490E/MAX3491E:+3.3V±15kVESD12MbpsRS-485/RS-422MAX481/MAX483/MAX485/MAX487–MAX491/MAX1487RS-485/RS-422________________________________________________________________MaximIntegratedProducts1_____________________________________________________________________19-0122;Rev8;10/03MAX481MAX483MAX485MAX487MAX488MAX489MAX490MAX491MAX1487PARTNUMBERHALF/FULLDUPLEXDATARATE(Mbps)SLEW-RATELIMITEDLOW-POWERSHUTDOWNRECEIVER/DRIVERENABLEQUIESCENTCURRENT(µA)NUMBEROFTRANSMITTERSONBUSPINCOUNTHalfHalfHalfHalfFullFullFullFullHalf2.50.252.50.250.250.252.52.52.5NoYesNoYesYesYesNoNoNoYesYesNoYesNoNoNoNoNoYesYesYesYesNoYesNoYesYes3001203001201201203003002303232321283232323212888888148148MAX481/MAX483/MAX485/MAX487–MAX491/MAX1487RS-485/RS-4222_______________________________________________________________________________________ABSOLUTEMAXIMUMRATINGSSupplyVoltage(VCC).............................................................12VControlInputVoltage(RE,DE)...................-0.5Vto(VCC+0.5V)DriverInputVoltage(DI).............................-0.5Vto(VCC+0.5V)DriverOutputVoltage(A,B)...................................-8Vto+12.5VReceiverInputVoltage(A,B).................................-8Vto+12.5VReceiverOutputVoltage(RO).....................-0.5Vto(VCC+0.5V)ContinuousPowerDissipation(TA=+70°C)8-PinPlasticDIP(derate9.09mW/°Cabove+70°C)....727mW14-PinPlasticDIP(derate10.00mW/°Cabove+70°C)..800mW8-PinSO(derate5.88mW/°Cabove+70°C).................471mW14-PinSO(derate8.33mW/°Cabove+70°C)...............667mW8-PinµMAX(derate4.1mW/°Cabove+70°C)..............830mW8-PinCERDIP(derate8.00mW/°Cabove+70°C).........640mW14-PinCERDIP(derate9.09mW/°Cabove+70°C).......727mWOperatingTemperatureRangesMAX4__C__/MAX1487C_A...............................0°Cto+70°CMAX4__E__/MAX1487E_A.............................-40°Cto+85°CMAX4__MJ_/MAX1487MJA...........................-55°Cto+125°CStorageTemperatureRange.............................-65°Cto+160°CLeadTemperature(soldering,10sec).............................+300°CDCELECTRICALCHARACTERISTICS(VCC=5V±5%,TA=TMINtoTMAX,unlessotherwisenoted.)(Notes1,2)Stressesbeyondthoselistedunder“AbsoluteMaximumRatings”maycausepermanentdamagetothedevice.Thesearestressratingsonly,andfunctionaloperationofthedeviceattheseoranyotherconditionsbeyondthoseindicatedintheoperationalsectionsofthespecificationsisnotimplied.Exposuretoabsolutemaximumratingconditionsforextendedperiodsmayaffectdevicereliability.VVIN=-7VVIN=12VVIN=-7VVIN=12VInputCurrent(A,B)IIN2VTHkΩ48-7V≤VCM≤12V,MAX487/MAX1487RINReceiverInputResistance-7V≤VCM≤12V,alldevicesexceptMAX487/MAX1487R=27Ω(RS-485),Figure40.4V≤VO≤2.4VR=50Ω(RS-422)IO=4mA,VID=-200mVIO=-4mA,VID=200mVVCM=0V-7V≤VCM≤12VDE,DI,REDE,DI,REMAX487/MAX1487,DE=0V,VCC=0Vor5.25VDE,DI,RER=27Ωor50Ω,Figure4R=27Ωor50Ω,Figure4R=27Ωor50Ω,Figure4DE=0V;VCC=0Vor5.25V,alldevicesexceptMAX487/MAX1487CONDITIONSkΩ12µA±1IOZRThree-State(highimpedance)OutputCurrentatReceiverV0.4VOLReceiverOutputLowVoltage3.5VOHReceiverOutputHighVoltagemV70∆VTHReceiverInputHysteresisV-0.20.2ReceiverDifferentialThresholdVoltage-0.2mA0.25mA-0.81.01.55VOD2DifferentialDriverOutput(withload)V2V5VOD1DifferentialDriverOutput(noload)µA±2IIN1InputCurrentV0.8VILInputLowVoltageV2.0VIHInputHighVoltageV0.2∆VODChangeinMagnitudeofDriverCommon-ModeOutputVoltageforComplementaryOutputStatesV0.2∆VODChangeinMagnitudeofDriverDifferentialOutputVoltageforComplementaryOutputStatesV3VOCDriverCommon-ModeOutputVoltageUNITSMINTYPMAXSYMBOLPARAMETERMAX481/MAX483/MAX485/MAX487–MAX491/MAX1487RS-485/RS-422_______________________________________________________________________________________3SWITCHINGCHARACTERISTICS—MAX481/MAX485,MAX490/MAX491,MAX1487(VCC=5V±5%,TA=TMINtoTMAX,unlessotherwisenoted.)(Notes1,2)DCELECTRICALCHARACTERISTICS(continued)(VCC=5V±5%,TA=TMINtoTMAX,unlessotherwisenoted.)(Notes1,2)mA7950V≤VO≤VCCIOSRReceiverShort-CircuitCurrentmA35250-7V≤VO≤12V(Note4)IOSD2DriverShort-CircuitCurrent,VO=LowmA35250-7V≤VO≤12V(Note4)IOSD1DriverShort-CircuitCurrent,VO=HighMAX1487,RE=0VorVCC250400350650ns103060tPHLDriverRiseorFallTimeFigures6and8,RDIFF=54Ω,CL1=CL2=100pFnsMAX490M,MAX491MMAX490C/E,MAX491C/E2090150MAX481,MAX485,MAX1487MAX490M,MAX491MMAX490C/E,MAX491C/EMAX481,MAX485,MAX1487Figures6and8,RDIFF=54Ω,CL1=CL2=100pFMAX481(Note5)Figures5and11,CRL=15pF,S2