5-332

FAST AND LS TTL DATA

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 of

arithmetic operations.

Plus Twelve Other Arithmetic Operations

Compare, AND, NAND, OR, NOR, Plus Ten other Logic Operations

NOTE:

The Flatpak version

has the same pinouts

(Connection Diagram) as

the Dual In-Line Package.

CONNECTION DIAGRAM DIP (TOP VIEW)

22

21

20

19

18

17

1

2

3

4

5

6

7

24

23

8

VCC

B0

A1 B1 A2 B2

B3

A3

G

A0 S3 S2 S1 S0 Cn M

9

10

11

12

F0 F1 F2 GND

16

15

14

13

Cn+4

A=B

P

F3

PIN NAMES

LOADING (Note a)

HIGH

LOW

A0 – A3, B0 – B3

S0 – S3

M

Cn

F0 – F3

A = B

G

P

Cn+4

Operand (Active LOW) Inputs

Function — Select Inputs

Mode Control Input

Carry Input

Function (Active LOW) Outputs

Comparator Output

Carry Generator (Active LOW)

Output

Carry Propagate (Active LOW)

Output

Carry Output

1.5 U.L.

2.0 U.L.

0.5 U.L.

2.5 U.L.

10 U.L.

Open Collector

10 U.L.

10 U.L.

10 U.L.

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.

NOTES:

a. 1 TTL Unit Load (U.L.) = 40

µA HIGH/1.6 mA LOW.

b. The Output LOW drive factor is 2.5 U.L. for Military (54) and 5 U.L. for Commercial (74)

SN54/74LS181

4-BIT ARITHMETIC

LOGIC UNIT

LOW POWER SCHOTTKY

ORDERING INFORMATION

SN54LSXXXJ

Ceramic

SN74LSXXXN

Plastic

LOGIC SYMBOL

VCC = PIN 24

GND = PIN 12

7

8

6

5

4

3

9

10

11

13

15

17

14

16

2 1 23 22 21 20 19 18

Cn

M

S0

S1

S2

S3

A0B0 A1 B1 A2 B2 A3 B3

F0

F1

F2

F3

Cn+4

A = B

G

P

24

1

J SUFFIX

CERAMIC

CASE 623-05

24

1

N SUFFIX

PLASTIC

CASE 649-03