DS75154 (RS-232 SERIAL PORT DEVICES) Quad Line Receiver +-----------+ 3T |1 +--+ 16| VCC2 2T |2 15| VCC1 1T |3 14| 4T 1A |4 DS75 13| 1Y 2A |5 154 12| 2Y 3A |6 11| 3Y 4A |7 10| 4Y GND |8 9| R1 +-----------+