UPD4722

RS-232 LINE DRIVER/RECEIVER AT 3.3V/5V

The µPD4722 is a high-breakdown voltage silicon gate CMOS line driver/receiver based on the EIA/TIA-232-E standard. The internal DC/DC converter can switch between multiple voltages, allowing it to operate with a single +3.3 V or +5 V power supply. It also provides standby function. This IC incorporates 4 driver circuits and 4 receiver circuits. An RS-232 interface circuit can be easily configured by connecting 5 capacitors externally.

FEATURES

• Conforms to EIA/TIA-232-E former name, RS-232C standards

• Selectable +3.3 V/+5 V single power supply selected by VCHA pin

• By setting the standby pin to a low level standby mode, circuit current can be reduced. At such times, the driver output is in a high-impedance state.

• Even in the standby mode, 2 receiver circuits can operate as inverters without hysteresis width. The other 2 circuits are fixed at a high level.