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參數資料
| 型號： | HD74HC589 |
| 廠商： | Hitachi,Ltd. |
| 英文描述： | Triple 3-Input Positive-NOR Gates 14-CDIP -55 to 125 |
| 中文描述： | 8位Parallel-input/Serial-output串行移位寄存器（3態輸出） |
| 文件頁數： | 1/10頁 |
| 文件大小： | 55K |
| 代理商： | HD74HC589 |
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
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 μA max
Low Quiescent Supply Current: I
CC
(static) = 4 μA max (Ta = 25°C)
Function Table
Latch Clock
LCK
Shift Clock
SCK
Serial Shift/
Parallel Load
Output Enable
OE
Function
X
X
X
Data are loaded into input latches
X
L
L
Data are loaded from input into shift
registers
X
X
L
L
Data are transfered from input
latches to shift registers
L, H,
L, H,
X
H
Outputs are disabled
X
H
L
Serial shift Q
n
= Q
n – 1
, Q
0
= SER
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