M74HC597 Ver la hoja de datos (PDF) - STMicroelectronics

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M74HC597

8 BIT LATCH/SHIFT REGISTER

STMicroelectronics 

M74HC597

INPUT AND OUTPUT EQUIVALENT CIRCUIT

PIN DESCRIPTION

PIN No

9

10

11

12

13

10

15, 1, 2, 3, 4,

5, 6, 7

8

16

SYMBOL

QH’

SCLR

SCK

RCK

SLOAD

SI

A to H

GND

Vcc

NAME AND FUNCTION

Serial Data Outputs

Asynchronous Reset

Input (Active LOW)

Shift Clock Input (LOW to

HIGH Edge-triggered)

Storage Clock Input (LOW

to HIGH Edge-triggered)

Parallel Data Input (Active

Low)

Serial Data Input

Parallel Data Inputs

Ground (0V)

Positive Supply Voltage

TRUTH TABLE

SI

SCK

X

X

X

X

L

H

X

X

X

X

X

X : Don’t Care

INPUTS

SCLR

L

H

SLOAD

H

L

H

H

H

H

H

H

X

X

X

X

RCK

X

X

X

X

X

OUTPUT

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

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

ISTER

STORAGE REGISTER STATE IS NOT CHANGED

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