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MC74LCX257M

Low-Voltage CMOS Quad 2-Input Multiplexer

ON Semiconductor 

MC74LCX257

VCC OE I0c I1c Zc I0d I1d Zd

16 15 14 13 12 11 10 9

12345678

S I0a I1a Za I0b I1b Zb GND

Figure 1. Pinout: 16−Lead Plastic Package

(Top View)

I0a 2

I1a 3

I0b 5

I1b 6

I0c 14

I1c 13

I0d 11

I1d 10

OE 15

S

1

PIN NAMES

Pins

Function

l0n

Source 0 Data Inputs

l1n

Source 1 Data Inputs

OE

Output Enable Input

S

Select Input

Zn

Outputs

Figure 2. Logic Diagram

TRUTH TABLE

Inputs

OE

S

l0n

l1n

Outputs

Zn

H

X

X

X

Z

L

H

X

L

L

L

H

X

H

H

L

L

L

X

L

L

L

H

X

H

H = High Voltage Level

L = Low Voltage Level

X = High or Low Voltage Level and Transitions are Acceptable

Z = High Impedance State

For ICC reasons, DO NOT FLOAT Inputs

4 Za

7 Zb

12 Zc

9 Zd

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