M54HC164

2/11

IEC LOGIC SYMBOLS

INPUT AND OUTPUT EQUIVALENT CIRCUIT

PIN DESCRIPTION

TRUTH TABLE

X : Don’t Care

QAn - QGn : The level of QA - QG, respectively. before the most-recent transition of the clock

PIN N°

SYMBOL

NAME AND FUNCTION

1, 2

A, B

Data Inputs

3, 4, 5, 6, 10,

11, 12, 13

QA to QH

Outputs

8CLOCK

Clock Input (LOW to

HIGH, Edge Triggered

9

CLEAR

Master Reset Input

7

GND

Ground (0V)

14

Positive Supply Voltage

INPUTS

OUTPUTS

CLEAR

CLOCK

SERIAL IN

QA

QB

...........

QH

AB

L

X

X

X

L

L

...........

L

HX

X

NO CHANGE

H

L

X

L

QAn

...........

QGn

H

X

L

L

QAn

...........

QGn

H

H

H

H

QAn

...........

QGn