©

1993

DATA SHEET

The

µPD4721 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, realizing the allowing it to

operate with a single +3.3 V or +5 V power supply. It also provides standby function.

This IC incorporates 2 driver circuits and 2 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.

ORDERING INFORMATION

Part number

Package

µPD4721GS-GJG

20-pin plastic SSOP (300 mil)

MOS INTEGRATED CIRCUIT

µPD4721

Document No.

S12198EJ2V0DS00 (2nd edition)

(Previous No. IC-3279)

Date Published January 1997 N

Printed in Japan

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