ICM7217_01 Datasheet, PDF (17/20 Pages) Intersil Corporation – 4-Digit LED Display, Programmable Up/Down Counter

ICM7217
RUN MIN/SEC
V_DD
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
R_S < 75Ω
THUMBWHEEL SWITCHES
5959 ⁴
ELAPSED
COUNTDOWN
LOAD SET PT.
DISPLAY OFF
V_DD
V_DD
SW2
SW3
10K
V_DD ^{PRESET SW4}
RESET SW5
EQUAL
ZERO
TO LOGIC GENERATING
SIGNALS FOR CONTROL OF
EXTERNAL EQUIPMENT
CARRY
D1
ZERO
D2
EQUAL
D3
D4
BCD
V_DD
I/O _{DIS. CONT.}
g
COUNT IN
b
STORE
V_SS
UP/DOWN
e
LOAD REG
f
LOAD CTR
d
SCAN
a
RESET
c
ICM7217
V_DD
DIGITS
4
BLANK
SW6 ^VDD
INHIBIT
LZB
COMMON ANODE
LED DISPLAY
7
SEGMENTS
FIGURE 21. PRECISION TIMER
17