Rs232 line driverreceivers st st232ecdr esd protected 5v rs232 transceiver 400kbps data rate 2us propagation delay rs232 interface 45v to 55v supply voltage 9v output voltage 0 to 70c 16 so case st232e is a 2 driver 2 receiver devices designed for rs232 and v28 communications in harsh environments st st232ecdr rs232 esd transceiver smt