Maxim Integrated, MAX233CPP+G36, Signal Interface, RS 232

In telecommunications, RS-232 is the name of the standard for serial binary single-ended data and control signals between a DTE (Data Terminal Equipment) and a DCE (Data Circuit-terminating Equipment).

https://www.futureelectronics.com/p/semiconductors--signal-interface--rs-232/max233cpp-g36-maxim-integrated-8085259