UPD4722

DATA SHEET MOS INTEGRATED CIRCUIT µPD4722 RS-232 LINE DRIVER/RECEIVER AT 3.3 V/5 V 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. ORDERING INFORMATION Part number Package 30-pin plastic SSOP (300 mil) µPD4722GS-GJG Document No. S12199EJ3V0DS00 (3rd edition) (Previous No. IC-3280) Date Published January 1997 N Printed in Japan © 1993 µ PD4722 BLOCK DIAGRAM/PIN CONFIGURATION (TOP VIEW) +10 V C3 + + 1 VDD C4+ 30 + C4 2 +3.3 V or +5 V C1 C1+ GND 29 + C2 C4– 28 3 VCC 4 C1– C5+ VSS 27 –10 V 5 C5 + 6 26 STBY GND C5– Note 4 300 Ω 25 VCHA 7 24 EN DIN1 8 300 Ω 23 DOUT1 DIN2 9 300 Ω 22 DOUT2 DIN3 10 300 Ω DIN4 11 21 DOUT3 20 DOUT4 ...