Casio QT-2100 Service Manual page 68

16. S-80130CNMC (IC30)
17. SN751178NSR (IC39)
INPUT
1B 1 16 V
CC
1A 2 15 1D
3 14 1Y
1R
1Z
1DE 4 13
2R 5 12 2DE
2A 6 11 2Z
H = high level,
L = low level,
7 10 2Y
2B
X = irrelevant,
2D
GND 8 9
Z = high impedance (off)
DIFFERENTIAL INPUTS
H = high level,
L = low level,
? = indeterminate
19. SN75189APWR (IC31-33,36,37)
1A 1
2
1CONT
3
1Y
A
4
2A
2CONT 5
Response
Control
6
2Y
GND 7
VDD
VREF
VSS
OUTPUTS
ENABLE
D DE
Y Z
H H H L
L H L H
X L Z Z
OUTPUT
A – B R
V ID . 0.2 V
H
–0.2 V < V ID < 0.2 V ?
V ID 3 –0.2 V L
14 V
CC+
13
4A
12
4CONT
Y
11 4Y
10 3A
3CONT
9
8 3Y
Delay Circuit
Oscillator
OUT
Circuit
Counter
Timer
DS
18. SN75188PWR (IC34,35,38,41,42)
V 1
CC-
1A
2
1A
3
1Y 2A
2B
4
2A
3A
2B 5
3B
6
2Y
4A
4B
GND 7
20. TC74HC4050AFT (IC26)
Vcc 1
1Y 2
1A 3
2Y 4
2A 5
3Y 6
3A 7
GND 8
— 66 —
14 V
CC+
1Y
13
4B
12 4A
2Y
11 4Y
3Y
10 3B
3A
9
4Y
8 3Y
16 NC
15 6Y
14 6A
13 NC
12 5Y
11 5A
10 4Y
9 4A