The DS14C239 is a three driver five receiver device which conforms to the TIA EIA-232-E standard and CCITT V 28 recommendations This device eliminates b12V supply by employing an internal DC-DC converter to generate the necessary output levels from a single a 5V supply and a positive voltage power supply ( a 7 5V to a 13 2V) Driver slew rate control and receiver noise filtering have also been internalized to eliminate the need for external slew rate control and noise filtering capacitors With the addition of TRI-STATE receiver outputs device power consumption is kept to a minimum