54LS283 Datasheet, PDF (1/8 Pages) National Semiconductor (TI) – 4-Bit Binary Adders with Fast Carry

June 1989
54LS283 DM54LS283 DM74LS283
4-Bit Binary Adders with Fast Carry
General Description
These full adders perform the addition of two 4-bit binary
numbers The sum (R) outputs are provided for each bit and
the resultant carry (C4) is obtained from the fourth bit
These adders feature full internal look ahead across all four
bits This provides the system designer with partial look-
ahead performance at the economy and reduced package
count of a ripple-carry implementation
The adder logic including the carry is implemented in its
true form meaning that the end-around carry can be accom-
plished without the need for logic or level inversion
Features
Y _{Full-carry look-ahead across the four bits}
Y _{Systems achieve partial look-ahead performance with}
the economy of ripple carry
Y _{Typical add times}
Two 8-bit words 25 ns
Two 16-bit words 45 ns
Y _{Typical power dissipation per 4-bit adder 95 mW}
Y _{Alternate Military Aerospace device (54LS283) is avail-}
able Contact a National Semiconductor Sales Office
Distributor for specifications
Connection Diagram
Dual-In-Line Package
TL F 6421 – 1
Order Number 54LS283DMQB 54LS283FMQB 54LS283LMQB
DM54LS283J DM54LS283W DM74LS283M or DM74LS283N
See NS Package Number E20A J16A M16A N16E or W16A
C1995 National Semiconductor Corporation TL F 6421
RRD-B30M105 Printed in U S A