ICM7226A_01 Datasheet, PDF (15/19 Pages) Intersil Corporation – 8-Digit, Multi-Function, Frequency Counter/Timer

ICM7226A, ICM7226B
D1
B IN
1N914
D4 D8 3
V+
V+
3kΩ
P
D
Q
Q
C
V+
V+
P
D
Q
Q
C
V+
74LS74
D1
F
D8 P
D2
R
V_DD
V_DD
P
Q
D
÷2 _CK
Q
C
P
Q
D
÷2 _CK
A IN
Q
C
39pF
V_DD
10kΩ
1
2
10kΩ
3
4
5
6
7
D1 ₈
D3
9
D2 10
D4 11
ICM7226B
V_DD
3kΩ
40
39
38
HOLD
V_DD
74LS74
V_DD
100kΩ
V_DD
V_DD
P
D
Q
IC ÷2
CK1
37
V_DD
36
35
34
V_DD
33
Q
C
22MΩ
10MHz ^VDD
CRYSTAL
32
39pF
39pF (TYP)
31
V_DD
V_DD
30 DP
V_DD
P
D
Q
IC ÷2
CK2
Q
C
V_DD
V_DD
3kΩ
12
29 g
D5 13
28 ^e
D6 ¹⁴
27 ^a
8
D7 ¹⁵
26 d
D8 16
17
18
25
V_DD
24 b
23 c
D1
4
19
20
RESET
0.1
µF
8
22 f
21
100kΩ
D2
D3
D4
a
b
c
d
e
f
g
DP
3
8
D8
D7
D6
D5
D4
D3 D2
D1 _D8
OVERFLOW
FIGURE 21. 40MHz FREQUENCY, PERIOD COUNTER
15