DM54LS181 DM74LS181 4-Bit Arithmetic Logic Unit
June 1992
DM54LS181 DM74LS181
4-Bit Arithmetic Logic Unit
General Description
The 鈥橪S181 is a 4-bit Arithmetic Logic Unit (ALU) which can
perform all the possible 16 logic operations on two variables
and a variety of arithmetic operations
Features
Y
Y
Y
Provides 16 arithmetic operations add subtract com-
pare double plus twelve other arithmetic operations
Provides all 16 logic operations of two variables exclu-
sive-OR compare AND NAND OR NOR plus ten
other logic operations
Full lookahead for high speed arithmetic operation on
long words
Connection Diagram
Dual-In-Line Package
TL F 9821 鈥?1
Order Number DM54LS181J DM54LS181W or DM74LS181N
See NS Package Number J24A N24A or W24C
Pin Names
A0鈥揂3
B0鈥揃3
S0鈥揝3
M
C
n
F0鈥揊3
A
e
B
G
P
C
n
a
4
Description
Operand Inputs (Active LOW)
Operand Inputs (Active LOW)
Function Select Inputs
Mode Control Input
Carry Input
Function Outputs (Active LOW)
Comparator Output
Carry Generate Output (Active LOW)
Carry Propagate Output (Active LOW)
Carry Output
C
1995 National Semiconductor Corporation
TL F 9821
RRD-B30M115 Printed in U S A