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54LS283 DM54LS283 DM74LS2834-BitBinaryAdderswithFastCarry

74LS283

74LS283

June1989

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

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