HD74HC590

2

Function Table

Inputs

G

RCK

CCLR

CCKEN

CCK

Function

H

X

X

X

X

Q output disabled

L

X

X

X

X

Q output enabled

X

X

X

X

Contents of counter stored to register

X

X

X

X

No change in register

X

X

L

X

X

Counter clear

XX

H

L

Count up

XX

H

L

No count

X

X

H

H

X

No count

RCO = QA’•QB’•QC’•QD’•QE’•QF’•QG’•QH’• (CCKEN) (QA’ to QH’: Output of Internal Counter)

Pin Arrangement

1

(Top view)

2

3

4

5

6

7

89

10

11

12

13

14

15

16

C

CCKEN

CCK

CCLR

RCO

RCK

GND