DM74LS181 Datasheet, PDF (1/7 Pages) Fairchild Semiconductor – 4-Bit Arithmetic Logic Unit

October 1988
Revised April 2000
DM74LS181
4-Bit Arithmetic Logic Unit
General Description
The DM74LS181 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
s Provides 16 arithmetic operations: add, subtract, com-
pare, double, plus twelve other arithmetic operations
s Provides all 16 logic operations of two variables:
exclusive-OR, compare, AND, NAND, OR, NOR, plus
ten other logic operations
s Full lookahead for high speed arithmetic operation on
long words
Ordering Code:
Order Number Package Number
Package Description
DM74LS181N
N24A
24-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-010, 0.600 Wide
Logic Symbols
Connection Diagram
Active High Operands
Active Low Operands
V_CC = Pin 24
GND = Pin 12
Pin Descriptions
Pin Names
Description
A0–A3
B0–B3
S0–S3
M
C_n
F0–F3
A=B
G
P
C_n+4
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
© 2000 Fairchild Semiconductor Corporation DS009821
www.fairchildsemi.com