74LS283

54LS283󰁋DM54LS283󰁋DM74LS2834-BitBinaryAdderswithFastCarry

GeneralDescription

Thesefulladdersperformtheadditionoftwo4-bitbinarynumbers󰀟Thesum(R)outputsareprovidedforeachbitandtheresultantcarry(C4)isobtainedfromthefourthbit󰀟Theseaddersfeaturefullinternallookaheadacrossallfourbits󰀟Thisprovidesthesystemdesignerwithpartiallook-aheadperformanceattheeconomyandreducedpackagecountofaripple-carryimplementation󰀟

Theadderlogic󰀷includingthecarry󰀷isimplementedinitstrueformmeaningthattheend-aroundcarrycanbeaccom-plishedwithouttheneedforlogicorlevelinversion󰀟

Features

YY

Y

YY

Full-carrylook-aheadacrossthefourbits

Systemsachievepartiallook-aheadperformancewiththeeconomyofripplecarryTypicaladdtimes

Two8-bitwords25nsTwo16-bitwords45ns

Typicalpowerdissipationper4-bitadder95mW

AlternateMilitary󰁋Aerospacedevice(54LS283)isavail-able󰀟ContactaNationalSemiconductorSalesOffice󰁋Distributorforspecifications󰀟

ConnectionDiagram

Dual-In-LinePackage

TL󰁋F󰁋6421–1

OrderNumber54LS283DMQB󰀷54LS283FMQB󰀷54LS283LMQB󰀷DM54LS283J󰀷DM54LS283W󰀷DM74LS283MorDM74LS283NSeeNSPackageNumberE20A󰀷J16A󰀷M16A󰀷N16EorW16A

C1995NationalSemiconductorCorporationTL󰁋F󰁋6421RRD-B30M105󰁋PrintedinU󰀟S󰀟A󰀟

AbsoluteMaximumRatings(Note)

IfMilitary󰁋Aerospacespecifieddevicesarerequired󰀷pleasecontacttheNationalSemiconductorSalesOffice󰁋Distributorsforavailabilityandspecifications󰀟SupplyVoltageInputVoltage

7V7V

Note󰀌The‘‘AbsoluteMaximumRatings’’arethosevaluesbeyondwhichthesafetyofthedevicecannotbeguaran-teed󰀟Thedeviceshouldnotbeoperatedattheselimits󰀟Theparametricvaluesdefinedinthe‘‘ElectricalCharacteristics’’tablearenotguaranteedattheabsolutemaximumratings󰀟The‘‘RecommendedOperatingConditions’’tablewilldefinetheconditionsforactualdeviceoperation󰀟OperatingFreeAirTemperatureRange

b55󰀂Ctoa125󰀂CDM54LSand54LS

DM74LS0󰀂Ctoa70󰀂CStorageTemperatureRange

b65󰀂Ctoa150󰀂C

RecommendedOperatingConditions

SymbolVCCVIHVILIOHIOLTA

Parameter

Min

SupplyVoltage

HighLevelInputVoltageLowLevelInputVoltageHighLevelOutputCurrentLowLevelOutputCurrentFreeAirOperatingTemperature

b55

DM54LS283

Nom5

Max5󰀟5

Min4󰀟752

0󰀟7

b0󰀟4

DM74LS283Nom5

Max5󰀟25

UnitsVV

0󰀟8

b0󰀟4

4󰀟52

VmAmA

4125

0

870

󰀂C

ElectricalCharacteristicsoverrecommendedoperatingfreeairtemperaturerange(unlessotherwisenoted)

SymbolVIVOHVOL

ParameterInputClampVoltageHighLevelOutput

Voltage

LowLevelOutputVoltage

Conditions

VCCeMin󰀷IIeb18mAVCCeMin󰀷IOHeMaxVILeMax󰀷VIHeMinVCCeMin󰀷IOLeMaxVILeMax󰀷VIHeMinIOLe4mA󰀷VCCeMin

IIIIHIILIOSICC1ICC2

InputCurrent󰀁MaxInputVoltageHighLevelInputCurrentLowLevelInputCurrentShortCircuitOutputCurrentSupplyCurrentSupplyCurrent

VCCeMaxVIe7VVCCeMaxVIe2󰀟7VVCCeMaxVIe0󰀟4VVCCeMax(Note2)

VCCeMax(Note3)VCCeMax(Note4)

DM54DM74DM54DM74DM74A󰀷BC0A󰀷BC0A󰀷BC0DM54DM74

b20b20

Min

Typ(Note1)

Max

b1󰀟5

UnitsVV

2󰀟52󰀟7

3󰀟43󰀟40󰀟250󰀟350󰀟25

0󰀟40󰀟50󰀟40󰀟20󰀟14020

b0󰀟8b0󰀟4b100b100

V

mA

mA

mA

mAmAmA

1922

3439

Note1󰀌AlltypicalsareatVCCe5V󰀷TAe25󰀂C󰀟

Note2󰀌Notmorethanoneoutputshouldbeshortedatatime󰀷andthedurationshouldnotexceedonesecond󰀟Note3󰀌ICC1ismeasuredwithalloutputsopen󰀷allBinputslowandallotherinputsat4󰀟5V󰀷orallinputsat4󰀟5V󰀟Note4󰀌ICC2ismeasuredwithalloutputsopenandallinputsgrounded󰀟

2

SwitchingCharacteristicsatVCCe5VandTAe25󰀂C(SeeSection1forTestWaveformsandOutputLoad)

SymboltPLHtPHLtPLHtPHLtPLHtPHLtPLHtPHLtPLHtPHLtPLHtPHL

Parameter

PropagationDelayTimeLowtoHighLevelOutputPropagationDelayTimeHightoLowLevelOutputPropagationDelayTimeLowtoHighLevelOutputPropagationDelayTimeHightoLowLevelOutputPropagationDelayTimeLowtoHighLevelOutputPropagationDelayTimeHightoLowLevelOutputPropagationDelayTimeLowtoHighLevelOutputPropagationDelayTimeHightoLowLevelOutputPropagationDelayTimeLowtoHighLevelOutputPropagationDelayTimeHightoLowLevelOutputPropagationDelayTimeLowtoHighLevelOutputPropagationDelayTimeHightoLowLevelOutput

From(Input)To(Output)C0toR1󰀷R2C0toR1󰀷R2C0toR3C0toR3C0toR4C0toR4AiorBitoRiAiorBitoRiC0toC4C0toC4AiorBitoC4AiorBitoC4

RLe2kX

CLe15pFMin

Max242424242424242417171717

CLe50pFMin

Max283028302830283024252426

nsnsnsnsnsnsnsnsnsnsnsnsUnits

FunctionTable

TL󰁋F󰁋6421–3

HeHighLevel󰀷LeLowLevel

Note󰀌InputconditionsatA1󰀷B1󰀷A2󰀷B2󰀷andC0areusedtodetermineoutputsR1andR2andthevalueoftheinternalcarryC2󰀟ThevaluesatC2󰀷A3󰀷B3󰀷A4󰀷andB4arethenusedtodetermineoutputsR3󰀷R4󰀷andC4󰀟

3

LogicDiagram

LS283

TL󰁋F󰁋6421–2

4

5

PhysicalDimensionsinches(millimeters)

CeramicLeadlessChipCarrierPackage(E)

OrderNumber54LS283LMQBNSPackageNumberE20A

16-LeadCeramicDual-In-LinePackage(J)OrderNumber54LS283DMQBorDM54LS283J

NSPackageNumberJ16A

6

PhysicalDimensionsinches(millimeters)(Continued)

16-LeadSmallOutlineMoldedPackage(M)

OrderNumberDM74LS283MNSPackageNumberM16A

16-LeadMoldedDual-In-LinePackage(N)

OrderNumberDM74LS283NNSPackageNumberN16E

7

54LS283󰁋DM54LS283󰁋DM74LS2834-BitBinaryAdderswithFastCarryPhysicalDimensionsinches(millimeters)(Continued)

16-LeadCeramicFlatPackage(W)

OrderNumber54LS283FMQBorDM54LS283W

NSPackageNumberW16A

LIFESUPPORTPOLICY

NATIONAL’SPRODUCTSARENOTAUTHORIZEDFORUSEASCRITICALCOMPONENTSINLIFESUPPORTDEVICESORSYSTEMSWITHOUTTHEEXPRESSWRITTENAPPROVALOFTHEPRESIDENTOFNATIONALSEMICONDUCTORCORPORATION󰀟Asusedherein󰀌1󰀟Lifesupportdevicesorsystemsaredevicesorsystemswhich󰀷(a)areintendedforsurgicalimplantintothebody󰀷or(b)supportorsustainlife󰀷andwhosefailuretoperform󰀷whenproperlyusedinaccordancewithinstructionsforuseprovidedinthelabeling󰀷canbereasonablyexpectedtoresultinasignificantinjurytotheuser󰀟

NationalSemiconductorCorporation1111WestBardinRoad2󰀟Acriticalcomponentisanycomponentofalifesupportdeviceorsystemwhosefailuretoperformcanbereasonablyexpectedtocausethefailureofthelifesupportdeviceorsystem󰀷ortoaffectitssafetyoreffectiveness󰀟

NationalSemiconductorEuropeFax󰀌(a49)0-180-5308586NationalSemiconductorHongKongLtd󰀟13thFloor󰀷StraightBlock󰀷NationalSemiconductorJapanLtd󰀟Tel󰀌81-043-299-2309