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
Cautions
1. Hitachi neither warrants nor grants licenses of any rights of Hitachi's or any third party's patent,
copyright, trademark, or other intellectual property rights for information contained in this document.
Hitachi bears no responsibility for problems that may arise with third party's rights, including
intellectual property rights, in connection with use of the information contained in this document.
2. Products and product specifications may be subject to change without notice. Confirm that you have
received the latest product standards or specifications before final design, purchase or use.
3. Hitachi makes every attempt to ensure that its products are of high quality and reliability. However,
contact Hitachi's sales office before using the product in an application that demands especially high
quality and reliability or where its failure or malfunction may directly threaten human life or cause risk
of bodily injury, such as aerospace, aeronautics, nuclear power, combustion control, transportation,
traffic, safety equipment or medical equipment for life support.
4. Design your application so that the product is used within the ranges guaranteed by Hitachi particularly
for maximum rating, operating supply voltage range, heat radiation characteristics, installation
conditions and other characteristics. Hitachi bears no responsibility for failure or damage when used
beyond the guaranteed ranges. Even within the guaranteed ranges, consider normally foreseeable
failure rates or failure modes in semiconductor devices and employ systemic measures such as fail-
safes, so that the equipment incorporating Hitachi product does not cause bodily injury, fire or other
consequential damage due to operation of the Hitachi product.
5. This product is not designed to be radiation resistant.
6. No one is permitted to reproduce or duplicate, in any form, the whole or part of this document without
written approval from Hitachi.
7. Contact Hitachi's sales office for any questions regarding this document or Hitachi semiconductor
products.
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Copyright ' Hitachi, Ltd., 1999. All rights reserved. Printed in Japan.
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