5-1

FAST AND LS TTL DATA

4-BIT BINARY FULL ADDER

WITH FAST CARRY

The SN54 / 74LS283 is a high-speed 4-Bit Binary Full Adder with internal

carry lookahead. It accepts two 4-bit binary words (A1–A4, B1–B4) and a

Carry Input (C0). It generates the binary Sum outputs (∑1–∑4) and the Carry

Output (C4) from the most significant bit. The LS283 operates with either ac-

tive HIGH or active LOW operands (positive or negative logic).

14

13

12

11

10

9

1

2

3

4

5

6

7

16

15

8

VCC

Σ2

B3

A3

Σ3

A4

Σ4

B4

C4

B2

A2

Σ1

A1

B1

C0 GND

CONNECTION DIAGRAM DIP (TOP VIEW)

NOTE:

The Flatpak version

has the same pinouts

(Connection Diagram) as

the Dual In-Line Package.

PIN NAMES

LOADING (Note a)

HIGH

LOW

A1 – A4

Operand A Inputs

1.0 U.L.

0.5 U.L.

B1–B4

Operand B Inputs

1.0 U.L.

0.5 U.L.

C0

Carry Input

0.5 U.L.

0.25 U.L.

∑1–∑4

Sum Outputs (Note b)

10 U.L.

5 (2.5) U.L.

C4

Carry Output (Note b)

10 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) Temperature Ranges.

SN54/74LS283

4-BIT BINARY FULL ADDER

WITH FAST CARRY

LOW POWER SCHOTTKY

ORDERING INFORMATION

SN54LSXXXJ

Ceramic

SN74LSXXXN

Plastic

SN74LSXXXD

SOIC

J SUFFIX

CERAMIC

CASE 620-09

N SUFFIX

PLASTIC

CASE 648-08

16

1

16

1

16

1

D SUFFIX

SOIC

CASE 751B-03

LOGIC SYMBOL

5

3 14 12 6 2 15 11

9

7

4

1 13 10

A1 A2 A3 A4 B1 B2 B3 B4

∑1 ∑2 ∑3 ∑4

VCC = PIN 16

GND = PIN 8

C0

C4