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_________________GeneralDescriptionTheMAX1480A/MAX1480B/MAX1480C/MAX1490A/MAX1490Barecomplete,electricallyisolated,RS-485/RS-422data-communicationsinterfacesolutionsinahybridmicrocircuit.Transceivers,optocouplers,andatransformerprovideacompleteinterfaceinastandardDIPpackage.Asingle+5Vsupplyonthelogicsidepow-ersbothsidesoftheinterface.TheMAX1480B/MAX1480C/MAX1490Bfeaturereduced-slew-ratedriversthatminimizeEMIandreducereflec-tionscausedbyimproperlyterminatedcables,allowingerror-freedatatransmissionatdataratesupto250kbps.TheMAX1480A/MAX1490Adriverslewrateisnotlimited,allowingtransmissionratesupto2.5Mbps.TheMAX1480A/B/Caredesignedforhalf-duplexcommuni-cation,whiletheMAX1490A/Bfeaturefull-duplexcom-munication.Driversareshort-circuitcurrentlimitedandprotectedagainstexcessivepowerdissipationbythermalshut-downcircuitrythatplacesthedriveroutputsintoahigh-impedancestate.Thereceiverinputhasafail-safefeaturethatguaranteesaknownoutput(ROlowfortheMAX1480A/B/C,ROhighfortheMAX1490A/B/C)iftheinputisopencircuit.TheMAX1480A/MAX1480B/MAX1480C/MAX1490A/MAX1490Btypicallywithstand1600VRMS(1minute)or2000VRMS(1second).TheirisolatedoutputsmeetallRS-485/RS-422specifications.TheMAX1480A/B/Careavailableina28-pinDIPpackage,andtheMAX1490A/Bareavailableina24-pinDIPpackage.________________________ApplicationsIsolatedRS-485/RS-422DataInterfaceTransceiversforEMI-SensitiveApplicationsIndustrial-ControlLocalAreaNetworksAutomaticTestEquipmentHVAC/BuildingControlNetworksNext-GenerationDeviceFeatures♦ForIntegratedESDProtectionMAX1480E/MAX1490E:±15kVESD-Protected,IsolatedRS-485/RS-422DataInterfaces♦ForSpace-ConstrainedApplicationsMAX3157:HighCMRR,RS-485Transceiverwith±50VIsolationMAX1480A/B/C/MAX1490A/BComplete,IsolatedRS-485/RS-422DataInterface________________________________________________________________MaximIntegratedProducts1124232221201918172345678AC1AC2ISOVCC1ISORODRVD2D1ABZYSDFSGND1161514139101112ISOCOM1ISODIDRVISOVCC2ISOROLEDGND2RODIDIPVCC2VCC3VCC4VCC1MAX1490A/BMAX845MAX488MAX490TOPVIEWISOLATIONBARRIERPinConfigurations19-0259;Rev4;10/03_______________OrderingInformationOrderingInformationcontinuedatendofdatasheet.†Dataratefor“A”partsisupto2.5Mbps.Dataratefor“B”and“C”partsisupto250kbps.PinConfigurationscontinuedatendofdatasheet.Forpricing,delivery,andorderinginformation,pleasecontactMaxim/DallasDirect!at1-888-629-4642,orvisitMaxim’swebsiteat†TEMPRANGEPIN-PACKAGEMAX1480ACPI0°Cto+70°C28WidePlasticDIPMAX1480AEPI-40°Cto+85°C28WidePlasticDIP_____________________SelectionTablePARTHALF/FULLDUPLEXDATARATE(MBPS)SLEW-RATELIMITEDDRIVERENABLETIME(µS)MAX1480AHalf2.5No0.2MAX1480BHalf0.25Yes35MAX1480CHalf0.25Yes0.5MAX1490AFull2.5No—MAX1490BFull0.25Yes—0755-28269789(VCC_=5V±10%,VFS=VCC_,TA=TMINtoTMAX,unlessotherwisenoted.TypicalvaluesareatVCC_=5VandTA=+25°C.)(Notes1,2)Stressesbeyondthoselistedunder“AbsoluteMaximumRatings”maycausepermanentdamagetothedevice.Thesearestressratingsonly,andfunctionaloperationofthedeviceattheseoranyotherconditionsbeyondthoseindicatedintheoperationalsectionsofthespecificationsisnotimplied.Exposuretoabsolutemaximumratingconditionsforextendedperiodsmayaffectdevicereliability.WithRespecttoGND_SupplyVoltage(VCC_)...........................................-0.3Vto+6VControlInputVoltage(SD,FS)...............-0.3Vto(VCC_+0.3V)ReceiverOutputVoltage(RO,RO)........-0.3Vto(VCC_+0.3V)OutputSwitchVoltage(D1,D2)........................................+12VWithRespecttoISOCOM_ControlInputVoltage(ISODE_)....-0.3Vto(ISOVCC_+0.3V)DriverInputVoltage(ISODI_).......-0.3Vto(ISOVCC_+0.3V)ReceiverOutputVoltage(ISORO_)...-0.3Vto(ISOVCC_+0.3V)DriverOutputVoltage(A,B,Y,Z)......................-8Vto+12.5VReceiverInputVoltage(A,B)..............................-8Vto+12.5VLEDForwardCurrent(DI,DE,ISOROLED)......................50mAContinuousPowerDissipation(TA=+70°C)24-PinPlasticDIP(derate8.7mW°Cabove+70°C).....696mW28-PinPlasticDIP(derate9.09mW/°Cabove+70°C)..727mWOperatingTemperatureRangesMAX1480_CPI/MAX1490_CPG............................0°Cto+70°CMAX1480_EPI/MAX1490_EPG.........................-40°Cto+85°CStorageTemperatureRange.............................-65°Cto+160°CLeadTemperature(soldering,10s).................................+300°CMAX1480A/B/C/MAX1490A/BPARAMETERSYMBOLCONDITIONSMINTYPMAXUNITSfSWLVFS=0V535SwitchFrequencyfSWHFS=VCC_oropen725kHzRL=∞,+25°Conly6090MAX1480A,DE´=VCC_oropenRL=54Ω120RL=∞,+25°Conly3545MAX1480B,DE´=VCC_oropenRL=54Ω95RL=∞,+25°Conly3575MAX1480C,DE´=VCC_oropenRL=54Ω95RL=∞,+25°Conly100150MAX1490ARL=54Ω170RL=∞,+25°Conly65125OperatingSupplyCurrentICCMAX1490BRL=54Ω130mAShutdownSupplyCurrent(Note3)ISHDNSD=VCC_0.2µAVSDHHigh2.4ShutdownInputThresholdVSDLLow0.8VShutdownInputLeakageCurrent10pAVFSHHigh2.4FSInputThresholdVFSLLow0.8VFSInputPullupCurrentFSlow50µAFSInputLeakageCurrentFShigh10pAInputHighVoltageVIHDE´,DI´VCC_-0.4VIn