S3
S2
S1
S0
S3
S2
S1
S0
54AC11881, 74AC11811
ARITHMETIC LOGIC UNITS/FUNCTION GENERATORS
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
5
Table 1. Logic Functions and Arithmetic Operations (Active-Low)
SELECTION
ACTIVE-LOW DATA
M = L; ARITHMETIC OPERATIONS
Cn = L (no carry)
F = A MINUS 1
F = AB MINUS 1
F = AB MINUS 1
F = MINUS 1 (2’s COMP)
F = A PLUS (A + B)
F = AB PLUS (A + B)
F = A MINUS B MINUS 1
F = A + B
F = A PLUS (A + B)
F = A PLUS B
F = AB PLUS (A + B)
F = (A + B)
F = A PLUS A
F = AB PLUS A
F = AB PLUS A
F = A
M = H
LOGIC FUNCTIONS
F = A
F = AB
F = A + B
F = 1
F = A + B
F = B
F = A
⊕
B
F = A + B
F = AB
F = A
⊕
B
F = B
F = A + B
F = 0
F = AB
F = AB
F = A
Cn = H (with carry)
F = A
F = AB
F = AB
F = ZERO
F = A PLUS (A + B) PLUS 1
F = AB PLUS (A + B) PLUS 1
F = A MINUS B
F = (A + B) PLUS 1
F = A PLUS (A + B) PLUS 1
F = A PLUS B PLUS 1
F = AB PLUS (A + B) PLUS 1
F = (A + B) PLUS 1
F = A PLUS A PLUS 1
F = AB PLUS A PLUS 1
F = AB PLUS A PLUS 1
F = A PLUS 1
L
L
L
L
L
L
L
L
H
H
H
H
H
H
H
H
L
L
L
L
H
H
H
H
L
L
L
L
H
H
H
H
L
L
H
H
L
L
H
H
L
L
H
H
L
L
H
H
L
H
L
H
L
H
L
H
L
H
L
H
L
H
L
H
Table 2. Logic Functions and Arithmetic Operations (Active-High)
SELECTION
ACTIVE-HIGH DATA
M = L; ARITHMETIC OPERATIONS
Cn = H (no carry)
F = A
F = A + B
F = A + B
F = MINUS 1 (2’s COMP)
F = A PLUS AB
F = (A + B) PLUS AB
F = A MINUS B MINUS 1
F = AB MINUS 1
F = A PLUS AB
F = A PLUS B
F = (A + B) PLUS AB
F = AB MINUS 1
F = A PLUS A
F = (A + B) PLUS A
F = (A + B) PLUS A
F = A MINUS 1
M = H
LOGIC FUNCTIONS
F = A
F = A + B
F = AB
F = 0
F = AB
F = B
F = A
⊕
B
F = AB
F = A + B
F = A
⊕
B
F = B
F = AB
F = 1
F = A + B
F = A + B
F = A
Cn = L (with carry)
F = A PLUS 1
F = (A + B) PLUS 1
F = (A + B) PLUS 1
F = ZERO
F = A PLUS AB PLUS 1
F = A PLUS AB PLUS 1
F = A MINUS B
F = AB
F = A PLUS AB PLUS 1
F = A PLUS B PLUS 1
F = (A + B) PLUS AB PLUS 1
F = AB
F = A PLUS A PLUS 1
F = (A + B) PLUS A PLUS 1
F = (A + B) PLUS A PLUS 1
F = A
L
L
L
L
L
L
L
L
H
H
H
H
H
H
H
H
L
L
L
L
H
H
H
H
L
L
L
L
H
H
H
H
L
L
H
H
L
L
H
H
L
L
H
H
L
L
H
H
L
H
L
H
L
H
L
H
L
H
L
H
L
H
L
H
Each bit is shifted to the next more significant position.
P