MC74HC589AD datasheet(5/12 Pages) ONSEMI

Part #	MC74HC589AD

Description	8-Bit Serial or Parallel-Input/Serial-Output Shift Register with 3-State Output

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MC74HC589A

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FUNCTION TABLE

Inputs

Resulting Function

Operation

Output

Enable

Serial Shift/

Parallel Load

Latch

Clock

Shift

Clock

Serial

Input

SA

Parallel

Inputs

A–H

Data

Latch

Contents

Shift

Register

Contents

Output

QH

Force output into high

impedance state

H

X

Z

Load parallel data into

data latch

L

H

L, H,

X

a–h

U

Transfer latch contents to

shift register

L

L, H,

X

U

LRN

SRN

LRH

Contents of input latch

and shift register are

unchanged

L

H

L, H,

X

U

Load parallel data into

data latch and shift

register

L

X

a–h

h

Shift serial data into shift

register

L

H

X

D

X

*

SRA = D,

SRN

SRN+1

SRG

SRH

Load parallel data in data

latch and shift serial data

into shift register

L

H

D

a–h

SRA = D,

SRN

SRN+1

SRG

SRH

LR = latch register contents

U = remains unchanged

SR = shift register contents

X = don’t care

a–h = data at parallel data inputs A–H

Z = high impedance

D = data (L, H) at serial data input SA

* = depends on Latch Clock input

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