DM74LS83A 4-Bit Binary Adder with Fast Carry

August 1986 Revised March 2000

DM74LS83A 4-Bit Binary Adder with Fast Carry
General Description
These full adders perform the addition of two4-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. Thisprovides 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 itstrue form meaning that the end-around carry can be accomplished without the need for logic or level inversion.

Features
s Full-carry look-ahead across the four bits s Systems achieve partiallook-ahead performance with the economy of ripple carry s Typical add times Two 8-bit words 25 ns Two 16-bit words 45 ns s Typical power dissipation per 4-bit adder 95 mW

Ordering Code:
Order NumberDM74LS83AN Package Number N16E Package Description 16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide

Connection Diagram

© 2000 Fairchild Semiconductor Corporation

DS006378www.fairchildsemi.com

DM74LS83A

Truth Table

H = HIGH Level, L = LOW Level Input conditions at A1, B1, A2, B2, and C0 are used to determine outputs ∑1 and ∑2 and the value of the internalcarry C2. The values at C2, A3, B3, A4, and B4 are then used to determine outputs ∑3, ∑4, and C4.

Logic Diagram

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DM74LS83A

Absolute Maximum Ratings(Note 1)
SupplyVoltage Input Voltage Operating Free Air Temperature Range Storage Temperature Range 7V 7V 0°C to +70°C −65°C to +150°C
Note 1: The “Absolute Maximum Ratings” are those values beyond which the safetyof the device cannot be guaranteed. The device should not be operated at these limits. The parametric values defined in the Electrical Characteristics tables are not guaranteed at the absolute... [continua]

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