7217 Ver la hoja de datos (PDF) - Intersil

Número de pieza

componentes Descripción

Fabricante

7217

4-Digit LED Display, Programmable Up/Down Counter

Intersil 

ICM7217

RUN MIN/SEC

VDD

100K

30pF

STOP SW1

1

14

2

13 RUN HRS/MIN

3

12

4 ICM7213 11

5

10 VDD

(4V MAX)

6

9

7

8

4

30pF

4.1943MHz

CRYSTAL

RS < 75Ω

THUMBWHEEL SWITCHES

5959 4

ELAPSED

COUNTDOWN

LOAD SET PT.

DISPLAY OFF

VDD

VDD

SW2

SW3

10K

VDD PRESET SW4

RESET SW5

EQUAL

ZERO

TO LOGIC GENERATING

SIGNALS FOR CONTROL OF

EXTERNAL EQUIPMENT

CARRY

D1

ZERO

D2

EQUAL

D3

D4

BCD

VDD

I/O DIS. CONT.

g

COUNT IN

b

STORE

VSS

UP/DOWN

e

LOAD REG

f

LOAD CTR

d

SCAN

a

RESET

c

ICM7217

VDD

DIGITS

4

BLANK

SW6 VDD

INHIBIT

LZB

COMMON ANODE

LED DISPLAY

7

SEGMENTS

FIGURE 21. PRECISION TIMER

17

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