MOTOROLA SN74LS283D, SN74LS283DR2, SN74LS283MEL, SN74LS283ML1, SN74LS283ML2 Datasheet

 Semiconductor Components Industries, LLC, 1999

December, 1999 – Rev. 6

1 Publication Order Number:

SN74LS283/D

SN74LS283

4-Bit Binary Full Adder
with Fast Carry

The SN74LS283 is a high-speed 4-Bit Binary Full Adder with

internal carry lookahead. It accepts two 4-bit binary words (A1–A

4,

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

GUARANTEED OPERATING RANGES

Symbol Parameter Min Typ Max Unit

V

CC

Supply Voltage 4.75 5.0 5.25 V

T

A

Operating Ambient

T emperature Range

0 25 70 °C

I

OH

Output Current – High –0.4 mA

I

OL

Output Current – Low 8.0 mA

LOW

POWER

SCHOTTKY

Device Package Shipping

ORDERING INFORMATION

SN74LS283N 16 Pin DIP 2000 Units/Box
SN74LS283D 16 Pin

SOIC

D SUFFIX

CASE 751B

http://onsemi.com

2500/Tape & Reel

PLASTIC
N SUFFIX
CASE 648

16

1

16

1

SN74LS283

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2

CONNECTION DIAGRAM DIP (TOP VIEW)

Operand A Inputs
Operand B Inputs
Carry Input
Sum Outputs
Carry Output

A

1

– A

4

B1 – B

4

C

0

S1 –

S

4

C

4

1.0 U.L.

1.0 U.L.

0.5 U.L.
10 U.L.
10 U.L.

0.5 U.L.

0.5 U.L.

0.25 U.L.
5 U.L.
5 U.L.

NOTES:

a) 1 TTL Unit Load (U.L.) = 40 mA HIGH/1.6 mA LOW.

HIGH LOW

(Note a)LOADING

PIN NAMES

LOGIC SYMBOL

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

5 3 14 12 6 2 15 11

97

4 1 13 10

A

1A2A3A4B1B2B3B4

∑1∑2∑3∑

4

VCC = PIN 16
GND = PIN 8

C

0

C

4

14 13 12 11 10 9

123456

7

16 15

8

V

CC

Σ

2

B3A3Σ3A

4

Σ

4

B

4

C

4

B2A2Σ1A1B1C0GND

SN74LS283

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3

LOGIC DIAGRAM

C0A

1

B

1

A

2

B

2

A

3

B

3

A

4

B

4

∑

1

∑

2

∑

3

∑

4

C

4

VCC = PIN 16
GND = PIN 8

= PIN NUMBERS

C

1

C

2

C

3

14

1

267

3

4

5

9

11

12

10

13

15

FUNCTIONAL DESCRIPTION

The LS283 adds two 4-bit binary words (A plus B) plus

the incoming carry. The binary sum appears on the sum
outputs (∑

1–∑4

) and outgoing carry (C4) outputs.

C0 + (A

1

+ B1) + 2(A

2

+ B2) + 4(A

3

+ B3) + 8(A

4

+ B4) = ∑

1

+ 2

∑

2

+ 4 ∑3 + 8 ∑

4

+ 16C

4

Where: (+) = plus

Due to the symmetry of the binary add function the LS283
can be used with either all inputs and outputs active HIGH
(positive logic) or with all inputs and outputs active LOW
(negative logic). Note that with active HIGH inputs, Carry
Input can not be left open, but must be held LOW when no
carry in is intended.

Example:

C0A1A2A3A4B1B2B3B4∑1∑2∑3∑4C

4

logic levels L L H L H H L L H H H L L H

Active HIGH 0 0 1 0 1 1 0 0 1 1 1 0 0 1 (10+9=19)

Active LOW 1 1 0 1 0 0 1 1 0 0 0 1 1 0 (carry+5+6=12)

Interchanging inputs of equal weight does not affect the operation, thus C0, A1, B1, can be arbitrarily assigned to pins 7, 5 or 3.