HCF4017B datasheet(6/11 Pages) STMICROELECTRONICS

Part #	HCF4017B

Description	DECADE COUNTER WITH 10 DECODED OUTPUTS

PDF	11 Pages

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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6 / 11 page

HCF4017B

6/11

TYPICAL APPLICATIONS

DIVIDE

COUNTER(N

10)

WITH

DECODED OUTPUTS

When the Nth decoded output is reached (Nth

clock pulse) the S-R flip-flop (constructed from two

NOR gates of the HCF4001B) generates a reset

pulse which clears the HCF4017B to its zero

count. At this time, if the Nth decoded output is

greater than or equal to 6, the COUT line goes high

to clock the next HCF4017B counter section. The

"0" decoded output also goes high at this time.

Coincidence of the clock low and decoded "0"

output high resets the S-R flip-flop to enable the

HCF4017B. If the Nth decoded output is less than

6, the COUT line will not go high and, therefore,

cannot be used. In this case "0" decoded output

may be used to perform the clocking function for

the next counter.

TEST CIRCUIT

CL = 50pF or equivalent (includes jig and probe capacitance)

RL = 200KΩ

RT = ZOUT of pulse generator (typically 50Ω)

HCF4017B Datasheet(PDF) 6 Page - STMicroelectronics