The MAX3232IDR has two receivers and two drivers, and a dual charge-pump circuit.The device meets the requirements  of TIA/EIA-232-F and provides the electrical interface between an asynchronous communication controller and the serial-port connector. The charge pump and four small external capacitors allow  operation from a single 3.0V to 5.5V supply. The device operates  at data signaling rates up to 250kbit/s and a maximum of 35V/μs driver output slew rate.