NAD T 747, Service Manual

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IC157: ST232CDR: RS-232 DRIVERS & RECEIVERS
PlN N° SYMBOL NOTE
1 C
1
+ Positive terminal for the first charge pump capacitor
2 V+ Doubled voltage terminal
3 C
1
- Negative terminal for the first charge pump capacitor
4 C
2
+ Positive terminal for the second charge pump capacitor
5 C
2
- Negative terminal for the second charge pump capacitor
6 V- Inverted voltage terminal
7 T2
OUT
Second transmitter output voltage
8 R2
IN
Second receiver input voltage
9 R2
OUT
Second receiver output voltage
10 T2
IN
Second transmitter input voltage
11 T1
IN
First transmitter input voltage
12 R1
OUT
First receiver output voltage
13 R1
IN
First receiver input voltage
14 T1
OUT
First transmitter output voltage
15 GND Ground
16 V
CC
Supply voltage
2-
27