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HD74HC589 Datasheet

  • HD74HC589

  • 8-bit Serial of Parallel-input/Serial-output Shift Register(...

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HD74HC589
8-bit Serial of Parallel-input/Serial-output Shift Register
(with 3-state outputs)
Description
The HD74HC589 is similar in function to the HD74HC597, which is not a 3-state device.
This device consists of an 8-bit storage latch which feeds parallel data to an 8-bit shift register. Data can
also be loaded serially (see Function Table). The shift register output, O
H
, is a three-state output, allowing
this device to be used in bus-oriented systems.
Features
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High Speed Operation: t
pd
(Shift Clock to Q
H
) = 15 ns typ (C
L
= 50 pF)
High Output Current: Fanout of 15 LSTTL Loads
Wide Operating Voltage: V
CC
= 2 to 6 V
Low Input Current: 1 碌A(chǔ) max
Low Quiescent Supply Current: I
CC
(static) = 4 碌A(chǔ) max (Ta = 25擄C)
Function Table
Latch Clock
LCK
Shift Clock
SCK
X
X
X
L, H,
X
X
L, H,
Serial Shift/
Parallel Load
X
L
L
X
H
Output Enable
OE
X
L
L
H
L
Function
Data are loaded into input latches
Data are loaded from input into shift
registers
Data are transfered from input
latches to shift registers
Outputs are disabled
Serial shift Q
n
= Q
n 鈥?1
, Q
0
= SER

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