Ultralow Power +3.3 V, RS-232 Notebook PC Serial P.
Analog Devices
ADM561 - RS-232 Notebook PC Serial Port Drivers/Receivers
Ultralow Power +3.3 V, RS-232 Notebook PC Serial Port Drivers/Receivers ADM560/ADM561 FEATURES RS-232 compatible Operates with 3 V or 5 V logic Ultra.