M74HCT257C1R 데이터 시트보기 (PDF) - STMicroelectronics

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M74HCT257C1R

HCT257 QUAD 2 CHANNEL MULTIPLEXER (3-STATE) HCT258 QUAD 2 CHANNEL MULTIPLEXER (3-STATE, INVERTING)

STMicroelectronics 

IEC LOGIC SYMBOL

HCT257

LOGIC DIAGRAM

HCT257

M54/M74HCT257/258

HCT258

HCT258

TRUTH TABLE

INPUTS

OE

SELECT

A

H

X

X

L

L

L

L

L

H

L

H

X

L

H

X

X = DON’T CARE Z = HIGH IMPEDANCE

OUTPUTS

B

Y (257)

Y (258)

X

Z

Z

X

L

H

X

H

L

L

L

H

H

H

L

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