The PD4713A is a high-voltage silicon gate CMOS line driver/reciever conforming to the EIA/TIA-232-E standard. It can operate with a single +5 V power source because it is provided with a DC-DC converter. In addition, this line driver/receiver has many ancillary functions, including output control, threshold select, and standby functions. Because the PD4713A is provided with three output driver circuits and three receiver circuits, it can constitute an RS-232 interface circuit with a single chip.