42
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
D
IN1
D
IN2
R
OUT1
R
OUT2
STBY
V
CHA
D
OUT1
D
OUT2
R
IN1
R
IN2
V
DD
C
1
+
V
CC
C
1
Ð
C
5
+
C
5
Ð
C
4
+
GND
C
4
Ð
V
SS
+10 V
C
3
C
1
C
5
Ð10 V
+
C
2
C
4
+
+
+
Note 4
300
300
5.5 k
5.5 k
+3.3 V
or
+5 V
+
Truth Table
Driver
STBY
D
IN
D
OUT
Remarks
L
Z
Standby mode (DC/DC converter is stopped)
H
L
H
Space level output
H
H
L
Mark level output
Receiver
STBY
R
IN
R
OUT
Remarks
L
H
Standby mode (DC/DC converter is stopped)
H
L
H
Mark level input
H
H
L
Space level input
3 V
5 V switching
V
CHA
Operating mode
L
5 V mode (double step-up)
H
3 V mode (3 times step-up)
H: high-level, L: low-level, Z: high-impedance, : H or L
QI81:µPD4721