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Número de pieza
componentes Descripción
7217 Ver la hoja de datos (PDF) - Intersil
Número de pieza
componentes Descripción
Fabricante
7217
4-Digit LED Display, Programmable Up/Down Counter
Intersil
7217 Datasheet PDF : 20 Pages
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ICM7217
R
A
5M
8
V
DD
7
DIS
R
B
1K
2
TR
6
TH
V
SS
1
0.47
µ
F
C
4
RS
3
OUT
3K 10K
0.047
µ
F
CV
5
GATE
GND
INVERTERS: CD40106B
NANDS: CD4011B
COUNT INPUT
GATE
STORE
300
µ
s
50
µ
s
FIGURE 19A.
1s
RESET
9
V
DD
24
STORE
ICM7217
8
COUNT
14
RESET
V
SS
20
FIGURE 19B.
FIGURE 19. INEXPENSIVE FREQUENCY COUNTER
LED DISPLAY
STOP
LOGIC TO GENERATE
RECORDER CONTROL
SIGNALS
ZERO
EQ
REEL SWITCH
CLOSED ONCE/REV
V
DD
1M
THUMBWHEEL SWITCHES
9999
4 DIGIT
0.0047
µ
F
V
DD
FORWARD
REWIND
N.O.
V
DD
SET PT
N.O.
RESET
1
CARRY
ZERO
EQUAL
BCD I/O
COUNT IN
STORE
UP/DOWN
LOAD REG
LOAD CTR
SCAN
RESET
28
d
b
f
c
V
DD
a
e
g
D1
D2
D3
D4
COMMON CATHODE
LED DISPLAY
7 SEGMENTS
BLANK
NORMAL
V
DD
INHIBIT LZB
4 DIGITS
FIGURE 20. TAPE RECORDER POSITION INDICATOR
16
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