HD74HC590 Datasheet, PDF (2/11 Pages) Hitachi Semiconductor – 8-bit Binary Counter/Register (with 3-state outputs)

HD74HC590
Function Table
Inputs
G
H
L
X
X
X
X
X
X
RCK
X
X
X
X
X
X
CCLR
X
X
X
X
L
H
H
H
CCKEN
X
X
X
X
X
L
L
H
CCK
X
X
X
X
X
X
Function
Q output disabled
Q output enabled
Contents of counter stored to register
No change in register
Counter clear
Count up
No count
No count
RCO = QA’•QB’•QC’•QD’•QE’•QF’•QG’•QH’• (CCKEN) (QA’ to QH’: Output of Internal Counter)
Pin Arrangement
QB 1
QC 2
QD 3
QE 4
QF 5
QG 6
QH 7
GND 8
(Top view)
16 VCC
15 QA
14 C
13 RCK
12 CCKEN
11 CCK
10 CCLR
9 RCO
2