SN74LS151

http://onsemi.com

3

LOGIC DIAGRAM

E

Z

Z

14

1

2

6

7

3

4

5

9

11

12

10

13

15

GND = PIN 8

= PIN NUMBERS

FUNCTIONAL DESCRIPTION

The LS151 is a logical implementation of a single pole,

8-position switch with the switch position controlled by the

negation outputs are provided. The Enable input (E) is active

LOW. When it is not activated, the negation output is HIGH

and the assertion output is LOW regardless of all other

inputs. The logic function provided at the output is:

Z = E

The LS151 provides the ability, in one package, to select

from eight sources of data or control information. By proper

manipulation of the inputs, the LS151 can provide any logic

function of four variables and its negation.

TRUTH TABLE

E

Z

Z

H

X

X

X

X

X

X

X

X

X

X

X

H

L

L

L

LLL

X

XXXX

XX

H

L

L

L

LL

H

X

XXXX

XX

L

H

L

L

LH

X

L

XXXX

XX

H

L

L

L

LH

X

H

XXXX

XX

L

H

L

L

HL

X

X

L

XXX

XX

H

L

L

L

HL

X

X

H

XXX

XX

L

H

L

L

HH

X

XX

L

X

XX

X

H

L

L

L

HH

X

XX

H

X

XX

X

L

H

L

H

LL

X

XX

X

L

XX

X

H

L

L

H

LL

X

XX

X

H

XX

X

L

H

L

H

LH

X

X

XXX

L

X

X

H

L

L

H

LH

X

X

XXX

H

X

X

L

H

L

H

HL

X

X

XXXX

L

X

H

L

L

H

HL

X

X

XXXX

H

X

L

H

L

H

HH

X

X

XXXX

X

L

H

L

L

H

H

H

X

X

X

X

X

X

X

H

L

H

H = HIGH Voltage Level

L = LOW Voltage Level

X = Don’t Care