HCF4026BM1 datasheet(2/11 Pages) STMICROELECTRONICS

Part #	HCF4026BM1

Description	DECADE COUNTER/DIVIDER WITH DECODED 7-SEGMENT DISPLAY OUTPUT AND DISPLAY ENABLE

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HCF4026B

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IINPUT EQUIVALENT CIRCUIT

PIN DESCRIPTION

FUNCTIONAL DIAGRAM

PIN No

SYMBOL

NAME AND FUNCTION

1

CLOCK

Clock Input

10, 12, 13, 9,

11, 6, 7

a to g

7 - Segments Decoded

Outputs

2

CLOCK

INHIBIT

Clock Inhibit Input

15

RESET

Reset Input

3

DISPLAY

ENABLE IN

Display Enable Input

5

CARRY OUT Carry Out Output

4

DISPLAY

ENABLE

OUT

Display Enable Output

14

UNGATED

"C" SEG-

MENT OUT

Ungated "C" Segment

Output

8

VSS

Negative Supply Voltage

16

VDD

Positive Supply Voltage

The seven decoded outputs (a, b, c, d, e, f, g)

illuminate the proper segments in a seven

segment display device used for representing the

decimal numbers 0 to 9. The 7-segment outputs

go high when the DISPLAY ENABLE IN is high.

When the DISPLAY ENABLE IN is low the seven

decoded outputs are forced low regardless of the

state of the counter. Activation of the display only

when required results in significant power savings.

This system also facilitates implementation of

display character multiplexing. The CARRY OUT

and UNGATED "C" SEGMENT signals are not

gated by the DISPLAY ENABLE and therefore are

available

continuously.

This

feature

is

a

requirement in implementation of certain divider

function such a as divide by 60 and divide by 12.

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