M74HC593 データシートの表示（PDF） - STMicroelectronics

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M74HC593

8 BIT BINARY COUNTER WITH INPUT REGISTER (3-STATE)

STMicroelectronics 

M54/M74HC593

INPUT AND OUTPUT EQUIVALENT CIRCUIT

TRUTH TABLE

GG

LH

CCLR

X

CCKEN

X

INPUTS

CCKEN CCK

X

X

CLOAD

X

HX

X

X

X

X

X

XL

X

X

X

X

X

XX

L

X

X

X

H

XX

H

X

X

X

L

XX

H

H

X

H

XX

H

X

L

H

XX

H

H

X

H

XX

H

X

L

H

XX

H

L

H

X

H

XX

X

X

X

X

X

XX

X

X

X

X

X

XX

X

X

X

X

X

X: Don’t Care

RCO = QA’ • QB’ • QC’ • QD’ • QE’ • QF’ • QG’ • QH’

(QA’ to QH’: Internal outputs of the counter)

RCKEN

X

X

X

RCK

X

X

X

FUNCTION

ALL Q BUS BECOME HIGH Z AND

CAN BE APPLIED ANY DATA

THE OUTPUT DATA OF THE

COUNTER IS ENABLE ON QA

THRU QH

X

X COUNTER IS CLEARED TO ZERO

X

X THE DATA OF Q BUS IS LOADED

INTO COUNTER

X

X COUNTER ADVANCES THE

X

X COUNT

X

X NO COUNT

X

X

X

X NO COUNT

H

X REGISTER DATA IS NOT

CHANGED

L

REGISTER DATA IS NOT

CHANGED

L

THE DATA OF Q BUS IS STORED

INTO REGISTER

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