MM74C90 查看數據表（PDF） - Fairchild Semiconductor

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产品描述 (功能)

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MM74C90

4-Bit Decade Counter • 4-Bit Binary Counter

Fairchild Semiconductor 

Function Tables

Reset/Count Function Table

Reset Inputs

Output

R01 R02 R91 R92

QD

QC

QB

QA

H

H

L

X

L

L

L

L

H

H

X

L

L

L

L

L

X

X

H

H

H

L

L

H

X

L

X

L

Count

L

X

L

X

Count

L

X

X

L

Count

X

L

L

X

Count

Reset/Count Function Table

Reset

Output

Inputs

R01

R02

QD

QC

QB

QA

H

H

L

L

L

L

L

X

Count

X

L

Count

3

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