DS14C237 (RS-232 SERIAL PORT DEVICES) Single Supply TIA/EIA-232 5x3 Driver/Receiver +-----------+ DOUT3 |1 +--+ 24| DOUT4 DOUT1 |2 23| RIN2 DOUT2 |3 22| ROUT2 RIN1 |4 21| DIN5 ROUT1 |5 20| DOUT5 DIN1 |6 DS14 19| DIN4 DIN2 |7 C237 18| DIN3 GND |8 17| ROUT3 VCC |9 16| RIN3 C1+ |10 15| V- V+ |11 14| C2- C1- |12 13| C2+ +-----------+