DS14C238
(RS-232 SERIAL PORT DEVICES)
Single Supply TIA/EIA-232 4x4 Driver/Receiver

      +-----------+
DOUT2 |1  +--+  24| DOUT3
DOUT1 |2        23| RIN3
 RIN2 |3        22| ROUT3
ROUT2 |4        21| DIN4
 DIN1 |5        20| DOUT4
ROUT1 |6  DS14  19| DIN3
 RIN1 |7  C238  18| DIN2
  GND |8        17| ROUT4
  VCC |9        16| RIN4
  C1+ |10       15| V-
   V+ |11       14| C2-
  C1- |12       13| C2+
      +-----------+