M74HC597 datasheet(2/14 Pages) STMICROELECTRONICS

2 / 14 page

M74HC597

2/14

INPUT AND OUTPUT EQUIVALENT CIRCUIT

PIN DESCRIPTION

TRUTH TABLE

X : Don’t Care

PIN No

SYMBOL

NAME AND FUNCTION

QH’

Serial Data Outputs

SCLR

Asynchronous Reset

Input (Active LOW)

SCK

Shift Clock Input (LOW to

HIGH Edge-triggered)

RCK

Storage Clock Input (LOW

to HIGH Edge-triggered)

SLOAD

Parallel Data Input (Active

Low)

Serial Data Input

15, 1, 2, 3, 4,

5, 6, 7

A to H

Parallel Data Inputs

GND

Ground (0V)

Vcc

Positive Supply Voltage

INPUTS

OUTPUT

SCK

SCLR

SLOAD

RCK

S.R. IS CLEARED TO "L"

INPUT REGISTER DATA IS STORED INTO S.R.

FIRST STAGE OF S.R. BECOMES "L" OTHER STAGES

STORE THE DATA OF PREVIOUS STAGE, RESPECTIVELY

FIRST STAGE OF S.R. BECOMES "H" OTHER STAGES

STORE THE DATA OF PREVIOUS STAGE, RESPECTIVELY

STATE OF S.R. IS NOT CHANGED

XXXX

INPUT DATA ON A ~ H LINE IS STORED INTO INPUT REG-

ISTER

XXXX

STORAGE REGISTER STATE IS NOT CHANGED

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