74HC595 데이터 시트보기 (PDF) - STMicroelectronics

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74HC595

8 BIT SHIFT REGISTER WITH OUTPUT LATCHES 3 STATE

STMicroelectronics 

M54/M74HC595

INPUT AND OUTPUT EQUIVALENT CIRCUIT

TRUTH TABLE

INPUTS

SI

SCK SCLR RCK

X

X

X

X

X

X

X

X

X

X

L

X

L

H

X

H

H

X

X

H

X

X

X

X

X

X

X

X: DON’T CARE

LOGIC DIAGRAM

OUTPUT

G

H

QA THRU QH OUTPUTS DISABLE

L

QA THRU QH OUTPUTS ENABLE

X

SHIFT REGISTER IS CLEARED

X

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

STORE THE DATA OF PREVIOUS STAGE, RESPECTIVELY

X

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

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