The PD4714A is a high-voltage silicon gate CMOS line dirver/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 PD4714A is provided with three output driver circuits and five receiver circuits, it can constitute an RS232 interface circuit with a single chip.