M74HC165

2/12

INPUT AND OUTPUT EQUIVALENT CIRCUIT

PIN DESCRIPTION

TRUTH TABLE

a........h : The level of steady input voltage at inputs a through respectively

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

LOGIC DIAGRAM

PIN No

SYMBOL

NAME AND FUNCTION

1

SHIFT/LOAD Data Inputs

2

QH

Complementary Output

7

QH

Serial Output

9

CLOCK

Clock Input (LOW to

HIGH, Edge Triggered

10

SI

Serial Data Inputs

11, 12, 13,

14, 3, 4, 5, 6

A to H

Parallel Data Inputs

15

CLOCK INH Clock Inhibit

8

GND

Ground (0V)

16

Vcc

Positive Supply Voltage

INPUTS

INTERNAL OUTPUTS

OUTPUTS

SHIFT /

LOAD

CLOCK INH

CLOCK

SI

A..........H

QA

QB

QH

L

X

X

X

a..........h

a

b

h

H

L

H

X

H

QAn

QGn

H

L

L

X

L

QAn

QGn

H

L

H

X

H

QAn

QGn

H

L

L

X

L

QAn

QGn

HXHX

X

NO CHANGE

H

H

X

X

X

NO CHANGE