The Texas Instruments DS8921MX/NOPB is a differential line driver and receiver pair designed for RS422 and RS485 applications. It offers a 10 Mbps signaling rate and operates within a 4.5V to 5.5V supply range.
The DS275S is a low-power RS-232 transceiver from Analog Devices / Maxim Integrated, designed for battery-backed systems. It operates from a 4.5V to 5.5V supply and is available in an 8-SOIC package.