M54HC690B1R datasheet(2/23 Pages) STMICROELECTRONICS

部件名	M54HC690B1R

功能描述	HC691/693 4 BIT BINARY COUNTER/REGISTER 3-STATE HC690/692 DECADE COUNTER/REGISTER 3-STATE

PDF	23 Pages

Scroll/Zoom	100%

制造商	STMICROELECTRONICS [STMicroelectronics]

网页	http://www.st.com

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counter’s outputs are stored in the output register at

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

cleared (synchronously

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

SYMBOL

NAME AND FUNCTION

3 to 6

A to D

Data Inputs

7, 14

ENT, ENP

Enable Inputs

15 to 18

QA to QD

Data Outputs

CCLR

Counter Clear (Active

LOW)

CCK

Counter Clock

R/C

Counter/ Register Select

RCLR

LOW)

RCK

RCO

Ripple Counter Output

GND

Ground (0V)

VCC

Positive Supply Voltage

IEC LOGIC SYMBOLS

HC691

HC692

HC693

HC690

M54/M74HC690/691/692/693

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