NAD T737 Service Manual page 37

IC157: ST232CDR: RS-232 DRIVERS & RECEIVERS
PlN N° SYMBOL
1 C +
1
2 V+
3 C -
1
4 C +
2
5 C -
2
6 V-
7 T2
OUT
8 R2
IN
9 R2
OUT
10 T2
IN
11 T1
IN
12 R1
OUT
13 R1
IN
14 T1
OUT
15 GND
16 V
CC
Positive terminal for the first charge pump capacitor
Doubled voltage terminal
Negative terminal for the first charge pump capacitor
Positive terminal for the second charge pump capacitor
Negative terminal for the second charge pump capacitor
Inverted voltage terminal
Second transmitter output voltage
Second receiver input voltage
Second receiver output voltage
Second transmitter input voltage
First transmitter input voltage
First receiver output voltage
First receiver input voltage
First transmitter output voltage
Ground
Supply voltage
2-24
NOTE