ST3243 3 TO 5.5V, 400KBPS, RS-232 TRANSCEIVER WITH.
PST3243 - CMOS System Reset
ST3243 - RS-232 TRANSCEIVER WITH AUTO-POWERDOWN
ST3243E - RS-232 TRANSCEIVER WITH AUTO-POWERDOWN
ST3243B - (ST3243B/C) transceiver
ST3243C - (ST3243B/C) transceiver