2

Functional Diagram

TRUTH TABLE

INPUTS

OUTPUT

SELECT

OUTPUT

CONTROL OE

Y

Y

S2

S1

S0

XXX

H

Z

Z

LLL

L

LL

H

L

LHL

L

LH

H

L

HL

L

L

HLH

L

HH

L

L

HHH

L

H = High Voltage Level, L = Low Voltage Level, X = Don’t Care, Z = High Impedance

5

6

Y

Y

4

3

2

1

14

12

13

15

11

10

9

7

OE

CHANNEL

INPUTS

DATA

SELECT

OUTPUTS

CD54HC251, CD74HC251, CD54HCT251, CD74HCT251