M54HC690 データシートの表示（PDF） - STMicroelectronics

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M54HC690

HC691/693 4 BIT BINARY COUNTER/REGISTER (3-STATE) HC690/692 DECADE COUNTER/REGISTER (3-STATE)

STMicroelectronics 

M54/M74HC690/691/692/693

counter’s outputs are stored in the output register at

the positive edge of the register clock (RCK). If the

register clear input (RCLR) is held ”L” the register is

cleared (synchronously to register clock for

HC692/HC693 and asynchronously for

HC690/HC691). All inputs are equipped with protec-

tion circuits against static discharge and transient

excess voltage.

INPUT AND OUTPUT EQUIVALENT CIRCUIT

PIN DESCRIPTION

PIN No

3 to 6

7, 14

15 to 18

1

2

11

8

9

19

10

20

SYMBOL

A to D

ENT, ENP

QA to QD

CCLR

CCK

R/C

RCLR

RCK

RCO

GND

VCC

NAME AND FUNCTION

Data Inputs

Enable Inputs

Data Outputs

Counter Clear (Active

LOW)

Counter Clock

Counter/ Register Select

Register Clear (Active

LOW)

Register Clock

Ripple Counter Output

Ground (0V)

Positive Supply Voltage

IEC LOGIC SYMBOLS

HC690

HC691

HC692

HC693

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