Casio QV-200B Service Manual & Parts List page 8

IC
IC505 NAND gate
IC506
Flip-flop
IC507 Voltage detector
Time Chart
Power on
1. PON
2. APO
3. POB
4. FACT
5. Power On
6. Voltage
detection
Operation
1
4
2
1
8
CK VCC
2
7
D PR
3
6
Q CLR
4
5
GND Q
Pin 2 (VDD)
> 3.2 V
< 3.2 V
Power off
H (VCC1)
1. PON
L
2. APO
L
H (VCC3)
3. POB
L
4. FACT
L
H (VCC1)
5. Power On
L
H (VCC0)
6. Voltage
detection
— 6 —
Pin 1 (OUT)
H
L
H (VCC1)
L
L
H (VCC3)
L
L
H (VCC1)
L
H (VCC0)
L