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HD74LS83A Datasheet, PDF (2/8 Pages) Hitachi Semiconductor – 4-Bit Binary Full Adders(with Fast Carry)
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HD74LS83A
Function Table
Output
Input
When C0 = L
When C0 = H
A1
B1
A2
B2
Σ1
A3
B3
A4
B4
Σ2
Σ3
When C2 = L
C2
Σ1
Σ4
C4
Σ2
Σ3
When C2 = H
C2
Σ4
C4
L
L
L
L
L
L
L
H
L
L
H
L
L
L
H
L
L
L
H
L
L
H
L
L
H
L
L
L
H
L
H
H
L
L
L
H
L
H
H
L
L
L
H
L
L
H
L
H
H
L
H
L
H
L
H
H
L
L
L
H
L
H
H
L
H
H
L
L
L
H
H
H
H
L
L
L
H
H
L
H
L
L
L
H
L
H
L
H
H
L
H
L
L
H
H
H
L
L
L
H
L
H
L
H
H
H
L
L
L
H
H
H
L
H
L
L
H
H
L
H
L
L
H
H
L
L
H
H
L
H
H
L
H
H
H
L
H
L
H
H
L
H
H
H
H
L
H
L
H
H
H
H
H
H
L
H
H
H
H
H
H; high level, L; low level, X; irrelevant
Note: Input conditions at A1, B1, A2, B2, and C0 are used to determine outputs Σ1 and Σ2 and the value of the internal
carry C2. The value at C2, A3, B3, A4, and B4 are than used to determine outputs Σ3, Σ4 and C4.
Rev.2.00, Feb.18.2005, page 2 of 7
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