MC74HC589A(2000) Просмотр технического описания (PDF) - ON Semiconductor

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MC74HC589A
(Rev.:2000)

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

ON Semiconductor 

MC74HC589A

FUNCTION TABLE

Inputs

Resulting Function

Operation

Force output into high

impedance state

Output Serial Shift/

Enable Parallel Load

H

X

Latch

Clock

X

Shift

Clock

X

Serial

Input

SA

X

Parallel

Inputs

A–H

X

Data

Latch

Contents

X

Shift

Register

Contents

X

Output

QH

Z

Load parallel data into

L

data latch

Transfer latch contents to

L

shift register

H

L, H,

X

a–h

a–h

U

U

L

L, H,

X

X

X

U

LRN SRN

LRH

Contents of input latch

L

H

L, H, L, H,

X

X

U

U

U

and shift register are

unchanged

Load parallel data into

L

L

data latch and shift

register

X

X

a–h

a–h

a–h

h

Shift serial data into shift

L

H

X

register

Load parallel data in data

L

H

latch and shift serial data

into shift register

D

X

D

a–h

*

SRA = D,

SRG SRH

SRN SRN+1

a–h

SRA = D,

SRG SRH

SRN SRN+1

LR = latch register contents

SR = shift register contents

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

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

U = remains unchanged

X = don’t care

Z = high impedance

* = depends on Latch Clock input

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