# UT3221/E CMOS IC

## Description
️· RS-232 Line Driver/Receiver
️· Designed for notebook computer applications.
️· Operates from +3.0V to +5.5V power supply.
️· Data rate up to 250kbps.
️· Low power consumption: 1µA in shutdown mode.
️· Automatic shutdown when no valid signal is detected.

## Features
️· 3.0V to 5.5V Power Supply
️· One Driver and One Receiver
️· 250 kbps Data Rate
️· Low Standby Current (1µA)
️· External Capacitors (4 x 0.1µF)
️· Accepts 5.0V Logic with 3.3V Supply
️· Serial-Mouse Drivability
️· ±8kV ESD Protection (HBM)

## Ordering Information
️· UT3221L-R16-R/G: SSOP-16, Tape Reel (Lead Free/Halogen Free)
️· UT3221L-P16-R/G: TSSOP-16, Tape Reel (Lead Free/Halogen Free)
️· UT3221EL-R16-T/G: SSOP-16, Tape Reel (Lead Free/Halogen Free)
️· UT3221EL-P16-T/G: TSSOP-16, Tape Reel (Lead Free/Halogen Free)

## Pin Descriptions (Key Pins)
️· EN: Receiver Enable Control (Low = Active, High = High-Z)
️· V+: +5.5V generated by charge pump
️· V-: -5.5V generated by charge pump
️· R1IN: RS-232 Receiver 1 Input
️· R1OUT: TTL/CMOS Receiver 1 Output
️· T1IN: TTL/CMOS Transmitter 1 Input
️· T1OUT: RS-232 Transmitter 1 Output
️· FORCEOFF: Shutdown transmitter and power supply (Active Low)
️· FORCEON: Override automatic circuitry (Keep transmitter on)
️· VCC: +3.0V ~ +5.5V Supply Voltage

## Electrical Characteristics (Key Parameters)
️· VCC: 3.0V to 6.0V
️· Shutdown Current (ISHDN): 10µA (typical)
️· Operating Temperature (TOPR): -40°C to +85°C

## Shutdown Function
️· Automatic shutdown when no valid signal is detected on the receiver input.
️· FORCEOFF Low disables transmitter and power supply.
️· FORCEON High forces transmitter on.