This part is a kind of semiconductor called MAX3232CWE.

Function of this product has 3.0V to 5.5V / Low-Power / up to 1Mbps / True RS-232 Transceivers Using Four 0.1F External Capacitors.

Manufacturers : Maxim

Image and pinout :

Some of the text within the PDF file :

19-0273; Rev 5; 3/99 3.0V to 5.5V, Low-Power, up to 1Mbps, True RS-232 Transceivers Using Four 0.1µF External Capacitors MAX3222/MAX3232/MAX3237/MAX3241* _______________General Description The MAX3222/MAX3232/MAX3237/MAX3241 transceivers have a proprietary low-dropout transmitter output stage enabling true RS-232 performance from a 3.0V to 5.5V supply with a dual charge pump. The devices require only four small 0.1µF external chargepump capacitors. The MAX3222, MAX3232, and MAX3241 are guaranteed to run at data rates of 120kbps while maintaining RS-232 output levels. The MAX3237 is guaranteed to run at data rates of 250kbps in the normal operating mode and 1Mbps in the MegaBaud™ operating mode, while maintaining RS-232 output levels. The MAX3222/MAX3232 have 2 receivers and 2 driver [ ... ]

MAX3232CWE PDF Datasheet Download