74LS283
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54LS283 DM54LS283 DM74LS2834-BitBinaryAdderswithFastCarry


June1989
54LS283 DM54LS283 DM74LS2834-BitBinaryAdderswithFastCarry
GeneralDescription
Thesefulladdersperformtheadditionoftwo4-bitbinarynumbers Thesum(R)outputsareprovidedforeachbitandtheresultantcarry(C4)isobtainedfromthefourthbit Theseaddersfeaturefullinternallookaheadacrossallfourbits Thisprovidesthesystemdesignerwithpartiallook-aheadperformanceattheeconomyandreducedpackagecountofaripple-carryimplementation
Theadderlogic includingthecarry isimplementedinitstrueformmeaningthattheend-aroundcarrycanbeaccom-plishedwithouttheneedforlogicorlevelinversion
Features
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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


