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TL/F/642154LS283/DM54LS283/DM74LS2834-BitBinaryAdderswithFastCarryJune198954LS283/DM54LS283/DM74LS2834-BitBinaryAdderswithFastCarryGeneralDescriptionThesefulladdersperformtheadditionoftwo4-bitbinarynumbers.Thesum(R)outputsareprovidedforeachbitandtheresultantcarry(C4)isobtainedfromthefourthbit.Theseaddersfeaturefullinternallookaheadacrossallfourbits.Thisprovidesthesystemdesignerwithpartiallook-aheadperformanceattheeconomyandreducedpackagecountofaripple-carryimplementation.Theadderlogic,includingthecarry,isimplementedinitstrueformmeaningthattheend-aroundcarrycanbeaccom-plishedwithouttheneedforlogicorlevelinversion.FeaturesYFull-carrylook-aheadacrossthefourbitsYSystemsachievepartiallook-aheadperformancewiththeeconomyofripplecarryYTypicaladdtimesTwo8-bitwords25nsTwo16-bitwords45nsYTypicalpowerdissipationper4-bitadder95mWYAlternateMilitary/Aerospacedevice(54LS283)isavail-able.ContactaNationalSemiconductorSalesOffice/Distributorforspecifications.ConnectionDiagramDual-In-LinePackageTL/F/6421±1OrderNumber54LS283DMQB,54LS283FMQB,54LS283LMQB,DM54LS283J,DM54LS283W,DM74LS283MorDM74LS283NSeeNSPackageNumberE20A,J16A,M16A,N16EorW16AC1995NationalSemiconductorCorporationRRD-B30M105/PrintedinU.S.A.AbsoluteMaximumRatings(Note)IfMilitary/Aerospacespecifieddevicesarerequired,pleasecontacttheNationalSemiconductorSalesOffice/Distributorsforavailabilityandspecifications.SupplyVoltage7VInputVoltage7VOperatingFreeAirTemperatureRangeDM54LSand54LSb55§Ctoa125§CDM74LS0§Ctoa70§CStorageTemperatureRangeb65§Ctoa150§CNote:The``AbsoluteMaximumRatings''arethosevaluesbeyondwhichthesafetyofthedevicecannotbeguaran-teed.Thedeviceshouldnotbeoperatedattheselimits.Theparametricvaluesdefinedinthe``ElectricalCharacteristics''tablearenotguaranteedattheabsolutemaximumratings.The``RecommendedOperatingConditions''tablewilldefinetheconditionsforactualdeviceoperation.RecommendedOperatingConditionsSymbolParameterDM54LS283DM74LS283UnitsMinNomMaxMinNomMaxVCCSupplyVoltage4.555.54.7555.25VVIHHighLevelInputVoltage22VVILLowLevelInputVoltage0.70.8VIOHHighLevelOutputCurrentb0.4b0.4mAIOLLowLevelOutputCurrent48mATAFreeAirOperatingTemperatureb55125070§CElectricalCharacteristicsoverrecommendedoperatingfreeairtemperaturerange(unlessotherwisenoted)SymbolParameterConditionsMinTypMaxUnits(Note1)VIInputClampVoltageVCCeMin,IIeb18mAb1.5VVOHHighLevelOutputVCCeMin,IOHeMaxDM542.53.4VVoltageVILeMax,VIHeMinDM742.73.4VOLLowLevelOutputVCCeMin,IOLeMaxDM540.250.4VoltageVILeMax,VIHeMinDM740.350.5VIOLe4mA,VCCeMinDM740.250.4IIInputCurrent@MaxVCCeMaxA,B0.2mAInputVoltageVIe7VC00.1IIHHighLevelInputVCCeMaxA,B40mACurrentVIe2.7VC020IILLowLevelInputVCCeMaxA,Bb0.8mACurrentVIe0.4VC0b0.4IOSShortCircuitVCCeMaxDM54b20b100mAOutputCurrent(Note2)DM74b20b100ICC1SupplyCurrentVCCeMax(Note3)1934mAICC2SupplyCurrentVCCeMax(Note4)2239mANote1:AlltypicalsareatVCCe5V,TAe25§C.Note2:Notmorethanoneoutputshouldbeshortedatatime,andthedurationshouldnotexceedonesecond.Note3:ICC1ismeasuredwithalloutputsopen,allBinputslowandallotherinputsat4.5V,orallinputsat4.5V.Note4:ICC2ismeasuredwithalloutputsopenandallinputsgrounded.2SwitchingCharacteristicsatVCCe5VandTAe25§C(SeeSection1forTestWaveformsandOutputLoad)From(Input)RLe2kXSymbolParameterTo(Output)CLe15pFCLe50pFUnitsMinMaxMinMaxtPLHPropagationDelayTimeC0to2428nsLowtoHighLevelOutputR1,R2tPHLPropagationDelayTimeC0to2430nsHightoLowLevelOutputR1,R2tPLHPropagationDelayTimeC0to2428nsLowtoHighLevelOutputR3tPHLPropagationDelayTimeC0to2430nsHightoLowLevelOutputR3tPLHPropagationDelayTimeC0to2428nsLowtoHighLevelOutputR4tPHLPropagationDelayTimeC0to2430nsHightoLowLevelOutputR4tPLHPropagationDelayTimeAiorBi2428nsLowtoHighLevelOutputtoRitPHLPropagationDelayTimeAiorBi2430nsHightoLowLevelOutputtoRitPLHPropagationDelayTimeC0to1724nsLowtoHighLevelOutputC4tPHLPropagationDelayTimeC0to1725nsHightoLowLevelOutputC4tPLHPropagationDelayTimeAiorBi1724nsLowtoHighLevelOutputtoC4tPHLPropagationDelayTimeAiorBi1726nsHightoLowLevelOutputtoC4FunctionTableTL/F/6421±3HeHighLevel,LeLowLevelNote:InputconditionsatA1,B1,A2,B2,andC0areusedtodetermineoutputsR1andR2andthevalueoftheinternalcarryC2.ThevaluesatC2,A3,B3,A4,andB4arethenusedtodetermineoutputsR3,R4,andC4.3LogicDiagramLS283TL/F/6421±245PhysicalDimensionsinches(millimeters)CeramicLeadlessChipCarrierPackage(E)OrderNumber54LS283LMQBNSPackageNumberE20A16-LeadCeramicDual-In-LinePackage(J)OrderNumber54LS283DMQBorDM54LS283JNSPackageNumberJ16A6PhysicalDimensionsinches(millimeters)(Continued)16-LeadSmallOutlineMoldedPackage(M)OrderNumberDM74LS283MNSPackageNumberM16A16-LeadMoldedDual-In-LinePackage(N)OrderNumberDM74LS283NNSPackageNumberN16E754LS283/DM54LS283/DM74LS2834-BitBinaryAdderswithFastCarryPhysicalDimensionsinches(millimeters)(Continued)16-LeadCeramicFlatPackage(W)OrderNumber54LS283FMQBorDM54LS283WNSPackageNumberW16ALIFESUPPORTPOLICYNATIONAL'SPRODUCTSARENOTAUTHORIZEDFORUSEASCRITICALCOMPONENTSINLIFESUPPORTDEVICESORSYSTEMSWITHOUTTHEEXPRESSWRITTENAPPROVALOFTHEPRESIDENTOFNATIONALSEMICONDUCTORCORPORATION.Asusedherein:1.Lifesupportdevicesorsystemsaredevicesor2.Acritic