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74LS283N/a200avai4-Bit Binary Adders with Fast Carry
DM54LS283JNSN/a20avai4-Bit Binary Adders with Fast Carry


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74LS283-DM54LS283J
4-Bit Binary Adder with Fast Carry
TL/F/6421
54LS283/DM54LS283/DM74LS283
4-Bit
Binary
Adders
with
Fast
Carry
June 1989
54LS283/DM54LS283/DM74LS283
4-Bit Binary Adders with Fast Carry
General Description
Thesefull adders performthe additionoftwo 4-bit binary
numbers.The sum(R) outputsare providedfor eachbitand
the resultant carry (C4)is obtained fromthe fourthbit.
These adders featurefull internal look ahead acrossallfour
bits. This providesthe system designer with partial look-
ahead performanceatthe economyand reduced package
countofa ripple-carry implementation.
The adder logic, includingthe carry,is implementedinits
true form meaningthatthe end-around carrycanbe accom-
plished withoutthe needfor logicor level inversion.
Features Full-carry look-ahead acrossthe fourbits Systems achieve partial look-ahead performance with
the economyof ripple carry Typical add times
Two 8-bit words25ns
Two 16-bit words45ns Typical power dissipationper 4-bit adder95 mW Alternate Military/Aerospace device (54LS283)is avail-
able. Contacta National Semiconductor Sales Office/
Distributorfor specifications.
Connection Diagram
Dual-In-Line Package
TL/F/6421–1
OrderNumber54LS283DMQB, 54LS283FMQB,54LS283LMQB,
DM54LS283J, DM54LS283W,DM74LS283Mor DM74LS283N
SeeNS Package Number E20A, J16A, M16A, N16Eor W16A
C1995National SemiconductorCorporation RRD-B30M105/PrintedinU.S.A.
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