The MAX3232CDR 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.