DS3695A中文资料

DS3695A/DS3695AT/DS3696AMultipointRS485/RS422TransceiversGeneralDescriptionTheDS3695AandDS3696AarehighspeeddifferentialTRI-STATE®bus/linetransceiversdesignedtomeetthere-quirementsofEIAstandardRS485withextendedcommonmoderange(+12Vto−7V),formultipointdatatransmission.InadditiontheyarecompatiblewithrequirementsofRS-422.ThedriverandreceiveroutputsfeatureTRI-STATEcapabil-ity.ThedriveroutputsremaininTRI-STATEovertheentirecommonmoderangeof+12Vto−7V.Busfaultsthatcauseexcessivepowerdissipationwithinthedevicetriggerather-malshutdowncircuit,whichforcesthedriveroutputsintothehighimpedancestate.TheDS3696Aprovidesanoutputpin(TS)whichreportsthethermalshutdownofthedevice.TSisan“opencollector”pinwithaninternal10kΩpull-upresistor.ThisallowstheTSoutputsofseveraldevicestobewireOR-ed.BothACandDCspecificationsareguaranteedoverthe0˚Cto70˚Ctemperatureand4.75Vto5.25Vsupplyvoltagerange.FeaturesnMeetsEIAstandardRS485formultipointbustransmissionandiscompatiblewithRS-422n10nsdriverpropagationdelays(typical)nSingle+5Vsupplyn−7Vto+12Vbuscommonmoderangepermits±7VgrounddifferencebetweendevicesonthebusnThermalshutdownprotectionnHighimpedancetobuswithdriverinTRI-STATEorwithpoweroff,overtheentirecommonmoderangeallowstheunuseddevicesonthebustobepowereddownnCombinedimpedanceofadriveroutputandreceiverinputislessthanoneRS485unitload,allowingupto32transceiversonthebusn70mVtypicalreceiverhysteresisnAvailableinSOICpackagingConnectionandLogicDiagramTRI-STATE®isaregisteredtrademarkofNationalSemiconductorCorporation.MoldedPackage,SmallOutline(M)DS005272-1TopViewDS005272-2TSwasLF(LineFault)onpreviousdatasheets,TSgoeslowuponthermalshutdown.TopViewOrderNumberDS3695AM,DS3695ATMorDS3696AMSeeNSPackageNumberM08AFebruary1996DS3695A/DS3695AT/DS3696AMultipointRS485/RS422Transceivers©1998NationalSemiconductorCorporationDS005272(Note1)IfMilitary/Aerospacespecifieddevicesarerequired,pleasecontacttheNationalSemiconductorSalesOffice/Distributorsforavailabilityandspecifications.SupplyVoltage,VCC7VControlInputVoltages7VDriverInputVoltage7VDriverOutputVoltages+15V/−10VReceiverInputVoltages+15V/−10VReceiverOutputVoltage5.5VContinuousPowerDissipation25˚CMPackage630mW(Note4)StorageTemp.Range−65˚Cto+150˚CLeadTemp.(Soldering4seconds)260˚CRecommendedOperatingConditionsMinMaxUnitsSupplyVoltage,VCC4.755.25VBusVoltage−7+12VOperatingFreeAirTemp.(TA)Commercial(DS3695AM)0+70˚CIndustrial(DS3695ATM)−40+85˚CCommercial(DS3696AM)0+70˚CElectricalCharacteristics(Notes2,3)0˚C≤TA≤70˚C,4.75VVCC5.25VunlessotherwisespecifiedSymbolParameterConditionsMinTypMaxUnitsVOD1DifferentialDriverOutputIO=05VVoltage(Unloaded)VOD2DifferentialDriverOutputR=50Ω;(RS-422)(Note5)2VVoltage(withLoad)R=27Ω;(RS-485)1.5VΔVODChangeinMagnitudeofDriverDifferentialOutputVoltageFor0.2VComplementaryOutputStatesVOCDriverCommonModeOutputVoltageR=27Ω3.0VΔ|VOC|ChangeinMagnitudeofDriverCommonModeOutputVoltage0.2VForComplementaryOutputStatesVIHInputHighVoltage2VVILInputLowVoltageDI,DE,0.8VVCLInputClampVoltageRE,RE/DEIIN=−18mA−1.5VIILInputLowCurrentVIL=0.4V−200μAIIHInputHighCurrentVIH=2.4V20μAIINInputCurrentDO/RI,DO/RIVCC=0Vor5.25VVIN=12V+1.0mARI,RIDEorRE/DE=0VVIN=−7V−0.8mAVTHDifferentialInputThreshold−7V≤VCM≤+12V−0.2+0.2VVoltageforReceiverΔVTHReceiverInputHysteresisVCM=0V70mVVOHReceiverOutputHighVoltageIOH=−400μA2.4VVOLOutputLowVoltageROIOL=16mA(Note5)0.5VTSIOL=8mA0.45VIOZROFF-State(HighImpedance)VCC=Max±20μAOutputCurrentatReceiver0.4V≤VO≤2.4VRINReceiverInputResistance−7V≤VCM≤+12V12kΩICCSupplyCurrentNoLoadDriverOutputsEnabled4260mA(Note5)DriverOutputsDisabled2740mAIOSDDriverShort-CircuitVO=−7V(Note5)−250mAOutputCurrentVO=+12V(Note5)+250mAIOSRReceiverShort-CircuitVO=0V−15−85mAOutputCurrentNote1:“Absolutemaximumratings”arethosebeyondwhichthesafetyofthedevicecannotbeguaranteed.Theyarenotmeanttoimplythatthedeviceshouldbeoperatedattheselimits.Thetablesof“ElectricalCharacteristics”provideconditionsforactualdeviceoperation.(Notes2,3)(Continued)Note2:Allcurrentsintodevicepinsarepositive;allcurrentsoutofdevicepinsarenegative.Allvoltagesarereferencedtodevicegroundunlessotherwisespecified.Note3:AlltypicalsaregivenforVCC=5VandTA=25˚C.Note4:Deratelinearlyat6.5mW/˚Cto337mWat70˚C.Note5:AlllimitsforwhichNote5isappliedmustbederatedby10%forDS3695AT.Otherparametersremainthesameforthisextendedtemperaturerangedevice(−40˚C≤TA≤+85˚C).SwitchingCharacteristics0˚C≤TA≤70˚C,4.75VVCC5.25Vunlessotherwisespecified(Note3)ReceiverSwitchingCharacteristics(Figures1,2andFigure3)SymbolConditionsMinTypMaxUnitstPLHCL=15pF152842nstPHLS1andS2152842ns|tPLH–tPHL|Closed03nstPLZCL=15pF,S2Open52935nstPHZCL=15pF,S1Open51216nstPZLCL=15pF,S2Open71528nstPZHCL=15pF,S1Open71520nsDriverSwitchingCharacteristicsSymbolConditionsMinTypMaxUnitsSINGLEENDEDCHARACTERISTICS(Figures4,5andFigure7)tPLHRLDIFF=60Ω91522nstPHLCL1=CL2=100pF91522nstSKEW|tPLH–tPHL|028nstPLZCL=15pF,S2Open71530nstPHZCL=15pF,S1Open71530nstPZLCL=100pF,S2Open303550nstPZHCL=100pF,S1Open303550nsDIFFERENTIALSWITCHINGCHARACTERISTICS(Figure7)t