ICM7217_01 Datasheet, PDF (16/20 Pages) Intersil Corporation – 4-Digit LED Display, Programmable Up/Down Counter

ICM7217
R_A
5M
8
V_DD
7
DIS
R_B
1K
2
TR
6
TH
V_SS
1
0.47µF
C
4
RS
3
OUT
3K 10K
0.047µF
CV
5
GATE
GND
INVERTERS: CD40106B
NANDS: CD4011B
COUNT INPUT
GATE
STORE
300µs
50µs
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}
0.0047µF
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