M74HC593(2001) 查看數據表（PDF） - STMicroelectronics

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M74HC593
(Rev.:2001)

8 BINARY COUNTER REGISTER WITH INPUT REGISTER (3 STATE)

STMicroelectronics 

M74HC593

INPUT AND OUTPUT EQUIVALENT CIRCUIT

PIN DESCRIPTION

PIN No

1, 2, 3, 4, 5,

6, 7, 8

9

11

12

13

14, 15

16

17

18, 19

10

20

SYMBOL

A/QA to

H/QH

CLOAD

RCO

CCLR

CCK

CCKEN,

CCKEN

RCK

RCKEN

G, G

GND

VCC

NAME AND FUNCTION

Binary Outputs

Counter Clock Load Input

Ripple Carry Output

Counter Clear Input

Counter Clock Input

Counter Clock Enable

Inputs

Register Clock Input

Register Clock Enable

Input

Output Enable

Ground (0V)

Positive Supply Voltage

TRUTH TABLE

INPUTS

G G CCLR CCKEN CCKEN CCK CLOAD RCKEN RCK

FUNCTION

LH X

X

X

X

X

X

X

ALL Q BUS BECOME HIGH Z AND CAN

BE APPLIED ANY DATA

HX X

X

X

X

X

X

X THE OUTPUT DATA OF THE COUNTER

XL X

X

X

X

X

X

X

IS ENABLE ON QA THRU QH

XX L

X

X

X

H

X

X

COUNTER IS CLEARED TO ZERO

XX H

X

X

X

L

X

X

THE DATA OF Q BUS IS LOADED INTO

COUNTER

XX H

H

X

XX H

X

L

H

X

X

COUNTER ADVANCES THE COUNT

H

X

X

XX H

H

X

XX H

X

L

H

X

X

H

X

X

NO COUNT

XX H

L

H

X

H

X

X

NO COUNT

XX X

X

X

X

X

H

X

REGISTER DATA IS NOT CHANGED

XX X

X

X

X

X

L

REGISTER DATA IS NOT CHANGED

XX X

X

X

X

X

L

THE DATAOF Q BUS IS STORED INTO

REGISTER

X: Don’t Care

RCO = QA’·QB’·QC’·QD’·QE’·QF’·QG’·QH’ (QA’ to QH’ : INTERNAL OUTPUTS OF THE COUNTER)

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