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SN54/74LS181 4-BIT ARITHMETIC LOGIC UNIT
The SN54 / 74LS181 is a 4-bit Arithmetic Logic Unit (ALU) which can perform all the possible 16 logic, operations on two variables and a variety ofarithmetic operations.

• Provides 16 Arithmetic Operations Add, Subtract, Compare, Double, • Provides all 16 Logic Operations of Two Variables Exclusive — OR, • Full Lookahead for High Speed ArithmeticOperation on Long Words • Input Clamp Diodes
Compare, AND, NAND, OR, NOR, Plus Ten other Logic Operations Plus Twelve Other Arithmetic Operations

4-BIT ARITHMETIC LOGIC UNIT
LOW POWER SCHOTTKYCONNECTION DIAGRAM DIP (TOP VIEW)
VCC A1 24 23 B1 22 A2 21 B2 20 A3 19 B3 18 G Cn+4 17 16 P 15 A=B 14 F3 13

24 1

J SUFFIX CERAMIC CASE 623-05

N SUFFIX PLASTIC CASE 649-03
24 1

1 B0

2 A03 S3

4 S2

5 S1

6 S0

7 Cn

8 M

9 F0

10 F1

11 12 F2 GND

ORDERING INFORMATION
SN54LSXXXJ SN74LSXXXN Ceramic Plastic

NOTE: The Flatpak version has the same pinouts(Connection Diagram) as the Dual In-Line Package.

LOGIC SYMBOL
PIN NAMES LOADING (Note a) HIGH A0 – A3, B0 – B3 S0 – S3 M Cn F0 – F3 A=B G P Cn+4 Operand (Active LOW) Inputs 1.5 U.L. Function — SelectInputs 2.0 U.L. Mode Control Input 0.5 U.L. Carry Input 2.5 U.L. Function (Active LOW) Outputs 10 U.L. Comparator Output Open Collector Carry Generator (Active LOW) 10 U.L. Output Carry Propagate(Active LOW) 10 U.L. Output Carry Output 10 U.L. LOW 0.75 U.L. 1.0 U.L. 0.25 U.L. 1.25 U.L. 5 (2.5) U.L. 5 (2.5) U.L. 10 U.L. 5 U.L. 5 (2.5) U.L.
7 8 6 5 4 3 Cn M 2 1 23 22 21 20 19 18 A0 B0 A1 B1 A2 B2 A3B3 Cn+4 A=B G P F1 10 F2 11 F3 13

16 14 17 15

S0 S1 S2 S3 F 0 9

VCC = PIN 24 GND = PIN 12

NOTES: a. 1 TTL Unit Load (U.L.) = 40 µA HIGH/1.6 mA LOW. b. The Output LOW drive factor is 2.5U.L. for Military (54) and 5 U.L. for Commercial (74) b. Temperature Ranges.

FAST AND LS TTL DATA 5-332

SN54/74LS181
LOGIC DIAGRAM
7 8 2 1 23 22 21 20 19 18

Cn M

A0

B0

A1

B1...