7217(1997) 데이터 시트보기 (PDF) - Intersil

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7217
(Rev.:1997)

4-Digit LED Display, Programmable Up/Down Counter

Intersil 

Timing Waveforms

UP/DOWN

COUNT INPUT

CARRY/BORROW

EQUAL

ZERO

ICM7217

tUCS

tUCH

tCWH

tCB

tBW

tCEL

tCZL

FIGURE 2. COUNT AND OUTPUTS TIMING

tCWL

tCEH

tCZH

LOAD COUNTER

(OR LOAD REGISTER)

SCAN

D4

D3

D2

D1

INTERNAL

OPERATING

MODE

INPUT

OUTPUT

BCD I/O

DN OUT

D4

D3

D2

IN

IN

IN

= HIGH IMPEDANCE

= THREE-STATE W/PULLDOWN

FIGURE 3. BCD I/O AND LOADING TIMING

COUNT INHIBITED IF

LOAD COUNTER

D1

IN

D4 OUT

D3 OUT

9-16

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