ICM7224 Datasheet, PDF (7/7 Pages) Intersil Corporation – 41/2 Digit LCD Display Counter

ICM7224
1 OVERFLOW
HIGH ORDER DIGITS
6 SEG
15 SEG
3 SEG
4 SEG
LOW ORDER DIGITS
1 BACKPLANE
6 SEG
15 SEG
8-DIGIT LCD DISPLAY
WITH OVERFLOW
4 SEG
3 SEG
ICM7224
HIGH ORDER DIGITS
SLAVE BACKPLANE
ICM7224
LOW ORDER DIGITS
MASTER BACKPLANE
SWITCH CLOSED INHIBITS
LEADING ZERO BLANKING
10kΩ
3V - 6V
+-
V_DD
C_OUT
1
14
2
13
3
12
4
11
5
10
6
9
7
8
ICM7207A
C_IN
SWITCH OPEN
1s GATING
SWITCH CLOSED
0.1s GATING
CRYSTAL
C_IN = 22pF
C_OUT = 22pF
f_O = 5.24288MHz
R_S < 75Ω
C_S = 0.015pF
C_P = 3.5pF
1_{/4 CD4069C}
INPUT
SIGNAL
CONDITIONING
(PRESCALER
LEVEL SHIFTING)
INPUT SIGNAL
FIGURE 8. EIGHT-DIGIT PRECISION FREQUENCY COUNTER
7