DS14185
(RS-232 SERIAL PORT DEVICES)
EIA/TIA-232 3x5 Driver/Receiver

      +-----------+
   V+ |1  +--+  20| VCC
 RIN1 |2        19| ROUT1
 RIN2 |3        18| ROUT2
 RIN3 |4        17| ROUT3
DOUT1 |5  DS14  16| DIN1
DOUT2 |6  185   15| DIN2
 RIN4 |7        14| ROUT4
DOUT3 |8        13| DIN3
 RIN5 |9        12| ROUT5
   V- |10       11| GND
      +-----------+