74HC595(2004) 查看數據表（PDF） - STMicroelectronics

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74HC595
(Rev.:2004)

8 BIT SHIFT REGISTER WITH OUTPUT LATCHES (3 STATE)

STMicroelectronics 

M74HC595

INPUT AND OUTPUT EQUIVALENT CIRCUIT

PIN DESCRIPTION

PIN N°

1, 2, 3, 4, 5,

6, 7, 15

9

10

11

13

14

12

8

16

SYMBOL NAME AND FUNCTION

QA to QH Data Outputs

QH’

SCLR

SCK

G

SI

RCK

GND

VCC

Serial Data Outputs

Shift Register Clear Input

Shift Register Clock Input

Output Enable Input

Serial Data Input

Storage Register Clock

Input

Ground (0V)

Positive Supply Voltage

TRUTH TABLE

SI

SCK

X

X

X

X

X

X

L

INPUTS

SCLR

X

X

L

H

RCK

X

X

X

X

H

H

X

X

H

X

X

X

X

X

X

X

X: Don’t Care

LOGIC DIAGRAM

OUTPUTS

G

H

QA THRU QH OUTPUTS DISABLE

L

QA THRU QH OUTPUTS ENABLE

X

SHIFT REGISTER IS CLEARED

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

X

STAGES STORE THE DATA OF PREVIOUS

STAGE, RESPECTIVELY

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

X

STAGES STORE THE DATA OF PREVIOUS

STAGE, RESPECTIVELY

X

STATE OF S.R. IS NOT CHANGED

X

S.R. DATA IS STORED INTO STORAGE

REGISTER

X

STORAGE REGISTER STATE IS NOT CHANGED

This logic diagram has not be used to estimate propagation delays

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