A dual RS-232 receivertransmitter that meets all the EIA RS-232C specifications while requiring only a single 5V supply. This significantly simplifies system design by removing the need to provide power supply voltages other than 5V. The IC has two on-board charge pump voltage convertors which generate 10V & -10V power supplies from the single 5V supply. The IC contains four level translators two of which convert TTLCMOS input levels into plusmn 9V RS-232 outputs ready for transmission & two of which convert RS-232 inputs to 5V TTLCMOS levels. The receivers have a nominal threshold of 1.3V a typical hysteresis of 0.5V & can operate with up to plusmn 30V inputs. Characteristics Supply voltage 5V plusmn 10 Output voltage swingplusmn 9VRS-232 input voltageplusmn 30V max Propagation delay 0.5micros Output resistance 300 Omega min RS-232 output short circuit currentplusmn 10m A