TC74HC595AP/AF/AFN

2007-10-01

2

IEC Logic Symbol

Truth Table

Inputs

SI

SCK

SCLR

RCK

G

Function

X

X

X

X

H

QA thru QH outputs disable

X

X

X

X

L

QA thru QH outputs enable

X

X

L

X

X

Shift register is cleared.

L

H

X

X

First stage of S.R. becomes “L”. Other stages store the data of previous stage,

respectively.

H

H

X

X

First stage of S.R. becomes “H”. Other stages store the data of previous

stage, respectively.

X

H

X

X

State of S.R. is not changed.

X

X

X

X

S.R. data is stored into storage register.

X

X

X

X

Storage register stage is not changed.

X: Don’t care