DM74LS283_98 Datasheet, PDF (1/8 Pages) Fairchild Semiconductor – 4-Bit Binary Adders with Fast Carry

March 1998
DM74LS283
4-Bit Binary Adders with Fast Carry
General Description
These full adders perform the addition of two 4-bit binary
numbers. The sum (∑) 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.
n Systems achieve partial look-ahead performance with
the economy of ripple carry
n Typical add times
Two 8-bit words 25 ns
Two 16-bit words 45 ns
n Typical power dissipation per 4-bit adder 95 mW
n Alternate Military/Aerospace device (54LS283) is
available. Contact a Fairchild Semiconductor Sales
Office/Distributor for specifications.
Features
n Full-carry look-ahead across the four bits
Connection Diagram
Dual-In-Line Package
DS006421-1
Order Number 54LS283DMQB, 54LS283FMQB, 54LS283LMQB,
DM54LS283J, DM54LS283W, DM74LS283M or DM74LS283N
See Package Number E20A, J16A, M16A, N16E or W16A
© 1998 Fairchild Semiconductor Corporation DS006421
www.fairchildsemi.com