Datasheet

Figure 1:
’LS181
’182
or
’S182
S3 S2 S1 S0
A1F1
A
2F2
A
3F3
B
0
B
1 A = B
B
2C
n+4
B3G
C
n
P
M
C
n
C
n+x
A0F0
C
n+y
G0C
n+z
G1
G
2
G3
P
0G
P1
P
2P
P3
Table 1:
Selection
Active−Low Data
M = H
Logic Functions
M = L; Arithmetic Operations
S3 S2 S1 S0 C
n
= L (no carry) C
n
= H (with carry)
L L L L F = A F = A MINUS 1 F = A
L L L H F = AB F = AB MINUS 1 F = AB
L L H L F = A + B F = AB MINUS 1 F = AB
L L H H F = 1 F = MINUS 1 (2’s COMPL) F = ZERO
L H L L F = A + B F = A PLUS (A + B) F = A PLUS (A + B) PLUS 1
L H L H F = B F = AB PLUS (A + B) F = AB PLUS (A + B) PLUS 1
L HHL
F = A
 B
F = A MINUS B MINUS 1 F = A MINUS B
L H H H F = A + B F = A + B F = (A + B) PLUS 1
L L L L F = AB F = A PLUS (A + B) F = A PLUS (A + B) PLUS 1
H LLH
F = A  B
F = A PLUS B F = A PLUS B PLUS 1
H L H L F = B F = AB PLUS (A + B) F = AB PLUS (A + B) PLUS 1
H L H H F = A + B F = (A + B) F = (A + B) PLUS 1
H H L L F = 0 F = A F = A PLUS A PLUS 1
H H L H F = AB F = AB PLUS A F = AB PLUS A PLUS 1
H H H L F = AB F = AB PLUS A F = AB PLUS A PLUS 1
H H H H F = A F = A F = A PLUS 1