99MAX3485ESA中文资料

_______________GeneralDescriptionTheMAX3483,MAX3485,MAX3486,MAX3488,MAX3490,andMAX3491are3.3V,low-powertrans-ceiversforRS-485andRS-422communication.Eachpartcontainsonedriverandonereceiver.TheMAX3483andMAX3488featureslew-rate-limiteddri-versthatminimizeEMIandreducereflectionscausedbyimproperlyterminatedcables,allowingerror-freedatatransmissionatdataratesupto250kbps.Thepar-tiallyslew-rate-limitedMAX3486transmitsupto2.5Mbps.TheMAX3485,MAX3490,andMAX3491transmitatupto10Mbps.Driversareshort-circuitcurrentlimitedandareprotect-edagainstexcessivepowerdissipationbythermalshutdowncircuitrythatplacesthedriveroutputsintoahigh-impedancestate.Thereceiverinputhasafail-safefeaturethatguaranteesalogic-highoutputifbothinputsareopencircuit.TheMAX3488,MAX3490,andMAX3491featurefull-duplexcommunication,whiletheMAX3483,MAX3485,andMAX3486aredesignedforhalf-duplexcommuni-cation.________________________ApplicationsLow-PowerRS-485/RS-422TransceiversTelecommunicationsTransceiversforEMI-SensitiveApplicationsIndustrial-ControlLocalAreaNetworks____________________________Features'OperatefromaSingle3.3VSupply—NoChargePump!'Interoperablewith+5VLogic'8nsMaxSkew(MAX3485/MAX3490/MAX3491)'Slew-RateLimitedforErrorlessDataTransmission(MAX3483/MAX3488)'2nALow-CurrentShutdownMode(MAX3483/MAX3485/MAX3486/MAX3491)'-7Vto+12VCommon-ModeInputVoltageRange'Allowsupto32TransceiversontheBus'Full-DuplexandHalf-DuplexVersionsAvailable'IndustryStandard75176Pinout(MAX3483/MAX3485/MAX3486)'Current-LimitingandThermalShutdownforDriverOverloadProtection______________OrderingInformationOrderingInformationcontinuedatendofdatasheet.*Contactfactoryforfordicespecifications.MAX3483/MAX3485/MAX3486/MAX3488/MAX3490/MAX34913.3V-Powered,10MbpsandSlew-Rate-LimitedTrueRS-485/RS-422Transceivers________________________________________________________________MaximIntegratedProducts1Calltollfree1-800-998-8800forfreesamplesorliterature.19-0333;Rev0;12/94PARTMAX3483CPAMAX3483CSAMAX3483C/D0°Cto+70°C0°Cto+70°C0°Cto+70°CTEMP.RANGEPIN-PACKAGE8PlasticDIP8SODice*PARTNUMBERGUARANTEEDDATARATE(Mbps)SUPPLYVOLTAGE(V)HALF/FULLDUPLEXSLEW-RATELIMITEDDRIVER/RECEIVERENABLESHUTDOWNCURRENT(nA)PINCOUNTMAX34830.25HalfYesYes28MAX348510HalfNoYes28MAX34862.5HalfYesYes28MAX34880.25FullYesNo—8MAX349010FullNoNo—8MAX3491103.0to3.6FullNoYes214______________________________________________________________SelectionTableMAX3483EPAMAX3483ESA-40°Cto+85°C-40°Cto+85°C8PlasticDIP8SOMAX3485CPAMAX3485CSAMAX3485C/D0°Cto+70°C0°Cto+70°C0°Cto+70°C8PlasticDIP8SODice*MAX3485EPAMAX3485ESA-40°Cto+85°C-40°Cto+85°C8PlasticDIP8SOMAX3483/MAX3485/MAX3486/MAX3488/MAX3490/MAX34913.3V-Powered,10MbpsandSlew-Rate-LimitedTrueRS-485/RS-422Transceivers2_______________________________________________________________________________________ABSOLUTEMAXIMUMRATINGSDCELECTRICALCHARACTERISTICS(VCC=3.3V±0.3V,TA=TMINtoTMAX,unlessotherwisenoted.TypicalvaluesareatTA=+25°C)Stressesbeyondthoselistedunder“AbsoluteMaximumRatings”maycausepermanentdamagetothedevice.Thesearestressratingsonly,andfunctionaloperationofthedeviceattheseoranyotherconditionsbeyondthoseindicatedintheoperationalsectionsofthespecificationsisnotimplied.Exposuretoabsolutemaximumratingconditionsforextendedperiodsmayaffectdevicereliability.SupplyVoltage(VCC)...............................................................7VControlInputVoltage(RE,DE)...................................-0.3Vto7VDriverInputVoltage(DI).............................................-0.3Vto7VDriverOutputVoltage(A,B,Y,Z)..........................-7.5Vto12.5VReceiverInputVoltage(A,B)................................-7.5Vto12.5VReceiverOutputVoltage(RO)....................-0.3Vto(VCC+0.3V)ContinuousPowerDissipation(TA=+70°C)8-PinPlasticDIP(derate9.09mW/°Cabove+70°C).....727mW8-PinSO(derate5.88mW/°Cabove+70°C)..................471mW14-PinPlasticDIP(derate10mW/°Cabove+70°C)......800mW14-PinSO(derate8.33mW/°Cabove+70°C)................667mWOperatingTemperatureRangesMAX34__C__.......................................................0°Cto+70°CMAX34__E__....................................................-40°Cto+85°CStorageTemperatureRange.............................-65°Cto+160°CLeadTemperature(soldering,10sec).............................+300°CDE=0V,VCC=0Vor3.6VDE=0V,RE=VCC,VCC=0Vor3.6V,MAX3491DE=0V,RE=0V,VCC=0Vor3.6V,MAX3491kΩ12RINReceiverInputResistanceµA±1IOZRThree-State(HighImpedance)OutputCurrentatReceiverV0.4VOLReceiverOutputLowVoltageVVCC-0.4VOHReceiverOutputHighVoltagemV50ΔVTHReceiverInputHysteresisV-0.20.2VTHReceiverDifferentialThresholdVoltageµA-1IOOutputLeakage(Y,Z)inShutdownMode1µA-20IOOutputLeakage(Y,Z)V0.2ΔVODChangeinMagnitudeofDriverDifferentialOutputVoltageforComplementaryOutputStates(Note1)V1.5VOD2.0DifferentialDriverOutput20mA-0.8IIN2InputCurrent(A,B)1.0µA±2IIN1LogicInputCurrentV3VOCDriverCommon-ModeOutputVoltageV0.2ΔVOCChangeinMagnitudeofCommon-ModeOutputVoltage(Note1)V2.0VIHInputHighVoltageV0.8VILInputLowVoltageUNITSMINTYPMAXSYMBOLPARAMETERRL=54Ωor100Ω,Figure4-7V≤VCM≤12VRL=54Ω(RS-485),Figure4VCC=3.6V,0V≤V