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Hitachi Power Semiconductor Device Electronic Components Datasheet

74HC590 Datasheet

8-bit Binary Counter/Register

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HD74HC590
8-bit Binary Counter/Register (with 3-state outputs)
Description
This device each contains an 8-bit binary counter that feeds an 8-bit storage register. The storage register
has parallel outputs. Separate clocks are provided for both the binary counter and storage register. The
binary counter features a direct clear input CCLR and a count enable input CCKEN. For cascading a ripple
carry output RCO is provided. Expansion is easily accomplished by tying RCO of the first stage to CCKEN
of the second stage, etc.
Both the counter and register clocks are positive-edge triggered. If the user wishes to connect both clocks
together, the counter state will always be one count ahead of the register, Internal circuitry prevents
clocking from the clock enable.
Features
High Speed Operation: tpd (RCK to Q) = 18.5 ns typ (CL = 50 pF)
High Output Current: Fanout of 15 LSTTL Loads
Wide Operating Voltage: VCC = 2 to 6 V
Low Input Current: 1 µA max
Low Quiescent Supply Current: ICC (static) = 4 µA max (Ta = 25°C)


Hitachi Power Semiconductor Device Electronic Components Datasheet

74HC590 Datasheet

8-bit Binary Counter/Register

No Preview Available !

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


Part Number 74HC590
Description 8-bit Binary Counter/Register
Maker Hitachi
Total Page 11 Pages
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