SN74LS257 查看數據表（PDF） - ON Semiconductor

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SN74LS257

Quad 2-Input Multiplexer with 3-State Outputs

ON Semiconductor 

SN74LS257B, SN74LS258B

LOGIC DIAGRAMS

SN74LS257B

E0

I0a

15

2

I1a

3

I0b

I1b

5

6

I0c

I1c

I0d

I1d

S

14

13

11

10

1

4

Za

E0

I0a

I1a

15

2

3

7

12

9

Zb

Zc

Zd

SN74LS258B

I0b

I1b

5

6

I0c

I1c

I0d

I1d

S

14

13

11

10

1

VCC = PIN 16

GND = PIN 8

= PIN NUMBERS

4

Za

7

12

9

Zb

Zc

Zd

http://onsemi.com

3

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