UPD4721 Datasheet, PDF (1/16 Pages) NEC – RS-232 LINE DRIVER/RECEIVER AT 3.3 V/5 V

DATA SHEET
MOS INTEGRATED CIRCUIT
µPD4721
RS-232 LINE DRIVER/RECEIVER AT 3.3 V/5 V
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
µPD4721GS-GJG
Package
20-pin plastic SSOP (300 mil)
Document No. S12198EJ2V0DS00 (2nd edition)
(Previous No. IC-3279)
Date Published January 1997 N
Printed in Japan
©
1993