HCF4026B datasheet(2/11 Pages) STMICROELECTRONICS

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HCF4026B

2/11

IINPUT EQUIVALENT CIRCUIT

PIN DESCRIPTION

FUNCTIONAL DIAGRAM

PIN No

SYMBOL

NAME AND FUNCTION

CLOCK

Clock Input

10, 12, 13, 9,

11, 6, 7

a to g

7 - Segments Decoded

Outputs

CLOCK

INHIBIT

Clock Inhibit Input

RESET

Reset Input

DISPLAY

ENABLE IN

Display Enable Input

CARRY OUT Carry Out Output

DISPLAY

ENABLE

OUT

Display Enable Output

UNGATED

"C" SEG-

MENT OUT

Ungated "C" Segment

Output

VSS

Negative Supply Voltage

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

requirement in implementation of certain divider

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

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