MAX485_1490资料

_________________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/BuildingControlNetworks____________________________FeaturesIsolatedDataInterface,Typicallyto1600VRMS(1minute)Slew-RateLimitedforErrorlessDataTransmission(MAX1480B/MAX1480C/MAX1490B)High-Speed,Isolated,2.5MbpsRS-485/RS-422Interface(MAX1480A/MAX1490A)Full-DuplexDataCommunication(MAX1490A/B)-7Vto+12VCommon-ModeInputVoltageRangewithRespecttoIsolatedGroundSingle+5VSupplyCurrentLimitingandThermalShutdownforDriverOverloadProtectionStandard0.6DIPPackage:28-PinDIP(MAX1480A/B/C)24-PinDIP(MAX1490A/B)MAX1480A/B/C/MAX1490A/BComplete,IsolatedRS-485/RS-422DataInterface________________________________________________________________MaximIntegratedProducts1124232221201918172345678AC1AC2ISOVCC1ISORODRVD2D1ABZYSDFSGND1161514139101112ISOCOM1ISODIDRVISOVCC2ISOROLEDGND2RODIDIPVCC2VCC3VCC4VCC1MAX1490A/BMAX845MAX488MAX490TOPVIEWISOLATIONBARRIERPinConfigurations19-0259;Rev3;8/02PART†MAX1480ACPIMAX1480AEPI-40°Cto+85°C0°Cto+70°CTEMPRANGEPIN-PACKAGE28WidePlasticDIP28WidePlasticDIP_______________OrderingInformationOrderingInformationcontinuedatendofdatasheet.†Dataratefor“A”partsisupto2.5Mbps.Dataratefor“B”and“C”partsisupto250kbps.PARTMAX1480AMAX1480BMAX1490AHALF/FULLDUPLEXHalfHalfFull_____________________SelectionTableMAX1490BFullDATARATE(Mbps)2.50.252.5SLEW-RATELIMITEDNoYesNo0.25YesDRIVERENABLETIME(µs)0.235——PinConfigurationscontinuedatendofdatasheet.MAX1480C0.25HalfYes0.5Forfreesamplesandthelatestliterature,visit(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