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 lookahead pe
Features
Y Y
Y
Y Y
Full-carry look-ahead across the four bits Systems achieve partial look-ahead performance with the economy of ripple carry Typical add times Two 8-bit words 25 ns Two 16-bit words 45 ns Typical power dissipation per 4-bit adder 95 mW Alternate Military Aerospace device (54LS83A) is available Contact a National Semiconductor Sales Office Distributor for specifications
Connection Diagram
Dual-In-Line Package
TL F 6378.
1
Order Number 54LS83ADMQB 54LS83AFMQB DM54LS83AJ DM54.
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54LS83A DM54LS83A DM74LS83A 4-Bit Binary Adders with Fast Carry
May 1989
54LS83A DM54LS83A DM74LS83A 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 lookahead 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 accomplished without the need for logic or level inversion
Features
Y Y
Y
Y Y
Full-carry look-ahead across the four bits Systems achieve partial
DM74LS83A Datasheet
