SN54LS83A Datasheet, Fast Carry, Motorola Inc

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Description:

4-bit binary full adder with fast carry.
The LS83A adds two 4-bit binary words (A plus B) plus the incoming carry.
The binary sum appears on the sum outputs (∑1 * ∑4) and outgoing carry (C4) outputs.
C0 + (A1+B1)+2(A2+B2)+4(A3+B3)+8(A4+B4) =.