CD74HCT157E 查看數據表（PDF） - Harris Semiconductor

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CD74HCT157E

High Speed CMOS Logic Quad 2-Input Multiplexers

Harris Semiconductor 

CD74HC157, CD74HCT157, CD74HC158, CD74HCT158

Functional Diagram

2

1I0

3

1I1

2I0 5

6

2I1

11

3I0

10

3I1

14

4I0

13

4I1

S

E

1 15

HC/HCT HC/HCT

157

158

4

1Y

1Y

7

2Y

2Y

9

3Y

3Y

12

4Y

4Y

TRUTH TABLE

SELECT

ENABLE INPUT

DATA INPUTS

OUTPUT

157

158

E

S

I0

I1

Y

Y

H

X

X

X

L

H

L

L

L

X

L

H

L

L

H

X

H

L

L

H

X

L

L

H

L

H

X

H

H

L

NOTE: H = High Voltage Level, L = Low Voltage Level, X = Don’t Care

2

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