SN74LS283

http://onsemi.com

3

LOGIC DIAGRAM

∑1

∑2

∑3

∑4

GND = PIN 8

= PIN NUMBERS

14

1

2

6

7

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 (

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:

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)