Datasheet

Figure 2:
’LS181
’182
or
’S182
S3 S2 S1 S0
A1 F1
A2 F2
A3 F3
B0
B1 A = B
B2 C
n+4
B3 Y
C
n
X
M
C
n
C
n+x
A0 F0
C
n+y
Y0 C
n+z
Y1
Y2
Y3
X0 Y
X1
X2 X
X3
Table 2:
Selection
Active−High Data
M = H
Logic Functions
M = L; Arithmetic Operations
S3 S2 S1 S0 C
n
= H (no carry) C
n
= L (with carry)
L L L L F = A F = A F = A PLUS 1
L L L H F = A + B F = A + B F = (A + B) PLUS 1
L L H L F = AB F = A + B F = (A + B) PLUS 1
L L H H F = 0 F = MINUS 1 (2’s COMPL) F = ZERO
L H L L F = AB F = A PLUS AB F = A PLUS AB PLUS 1
L H L H F = B F = (A + B) PLUS AB F = (A + B) PLUS AB PLUS 1
L HHL
F = A  B
F = A MINUS B MINUS 1 F = A MINUS B
L H H H F = AB F = AB MINUS 1 F = AB
L L L L F = A + B F = A PLUS AB F = A PLUS AB PLUS 1
H LLH
F = A
 B
F = A PLUS B F = A PLUS B PLUS 1
H L H L F = B F = (A + B) PLUS AB F = (A + B) PLUS AB PLUS 1
H L H H F = AB F = AB MINUS 1 F = AB
H H L L F = 1 F = A F = A PLUS A PLUS 1
H H L H F = A + B F = (A + B) PLUS A F = (A + B) PLUS A PLUS 1
H H H L F = A + B F = (A + B) PLUS A F = (A + B) PLUS A PLUS 1
H H H H F = A F = A MINUS 1 F = A