概述 TheMAX481E,MAX483E,MAX485E,MAX487E-MAX491E,andMAX1487Earelow-powertransceiversforRS-485andRS-422communicationsinharshenvironments.Eachdriveroutputandreceiverinputisprotectedagainst±15kVelectro-staticdischarge(ESD)shocks,withoutlatchup.Thesepartscontainonedriverandonereceiver.TheMAX483E,MAX487E,MAX488E,andMAX489Efeaturereducedslew-ratedriversthatminimizeEMIandreducereflectionscausedbyimproperlyterminatedcables,thusallowingerror-freedatatransmissionupto250kbps.ThedriverslewratesoftheMAX481E,MAX485E,MAX490E,MAX491E,andMAX1487Earenotlimited,allowingthemtotransmitupto2.5Mbps.

Thesetransceiversdrawaslittleas120μAsupplycurrentwhenunloadedorwhenfullyloadedwithdisableddrivers(seeSelectorGuide).Additionally,theMAX481E,MAX483E,andMAX487Ehavealow-currentshutdownmodeinwhichtheyconsumeonly0.5μA.Allpartsoperatefromasingle+5Vsupply.

Driversareshort-circuitcurrentlimited,andareprotectedagainstexcessivepowerdissipationbythermalshutdowncircuitrythatplacestheiroutputsintoahigh-impedancestate.Thereceiverinputhasafail-safefeaturethatguaranteesalogic-highoutputiftheinputisopencircuit.

TheMAX487EandMAX1487Efeaturequarter-unit-loadreceiverinputimpedance,allowingupto128transceiversonthebus.TheMAX488E-MAX491Earedesignedforfull-duplexcommunications,whiletheMAX481E,MAX483E,MAX485E,MAX487E,andMAX1487Earedesignedforhalf-duplexapplications.ForapplicationsthatarenotESDsensitiveseethepinandfunction-compatibleMAX481,MAX483,MAX485,MAX487-MAX491,andMAX1487. 關鍵特性

ForFault-TolerantApplications:
MAX3430:±80VFault-Protected,Fail-Safe,1/4-UnitLoad,+3.3V,RS-485TransceiverMAX3080-MAX3089:Fail-Safe,High-Speed(10Mbps),Slew-Rate-Limited,RS-485/RS-422Transceivers

ForSpace-ConstrainedApplications:
MAX3460-MAX3464:+5V,Fail-Safe,20Mbps,Profibus,RS-485/RS-422TransceiversMAX3362:+3.3V,High-Speed,RS-485/RS-422TransceiverinaSOT23PackageMAX3280E-MAX3284E:±15kVESD-Protected,52Mbps,+3Vto+5.5V,SOT23,RS-485/RS-422TrueFail-SafeReceiversMAX3030E-MAX3033E:±15kVESD-Protected,+3.3V,QuadRS-422Transmitters

ForMultipleTransceiverApplications:
MAX3293/MAX3294/MAX3295:20Mbps,+3.3V,SOT23,RS-485/RS-422Transmitters

ForFail-SafeApplications:
MAX3440E-MAX3444E:±15kVESD-Protected,±60VFault-Protected,10Mbps,Fail-SafeRS-485/J1708Transceivers

ForLow-VoltageApplications:
MAX3483E/MAX3485E/MAX3486E/MAX3488E/MAX3490E/MAX3491E:+3.3VPowered,±15kVESD-Protected,12Mbps,Slew-Rate-Limited,TrueRS-485/RS-422Transceivers

應用/使用

工業控制局域網

電平轉換器

低功耗RS-422收發器

低功耗RS-485收發器

用于EMI敏感應用的收發器

MAX1487EESA 限擺率、低功耗、RS-485/RS-422收發器