# UT3238 RS-232 Line Drivers/Receivers

## Overview
The UT3238 is a CMOS IC consisting of 5 drivers and 3 receivers, designed for RS-232 communication, particularly in notebook computers. It supports data rates up to 250kbps and operates with a +3.3V to +5.0V power supply.

## Features
️· Power Supply: +3.3V to +5.0V
️· Data Rate: Up to 250 kbps
️· Drivers/Receivers: 5 drivers, 3 receivers
️· Low Power: 1µA supply current in shutdown mode
️· External Capacitors: Requires 0.1µF capacitors (for 3.3V operation)
️· Logic Input: Accepts 5.0V logic with a 3.3V supply
️· Always-Active Receiver: One receiver remains active during shutdown for monitoring.
️· ESD Protection: Exceeds ±8KV ESD protection (HBM) for RS-232 I/O pins.

## Pin Descriptions (Key Pins)
️· VCC: +3.3V to +5.0V Supply Voltage
️· GND: Ground
️· TXIN: TTL/CMOS Transmitter Inputs
️· TXOUT: RS-232 Transmitter Outputs
️· RXIN: RS-232 Receiver Inputs
️· RXOUT: TTL/CMOS Receiver Outputs
️· FORCEON: Override to keep transmitters on.
️· FORCEOFF: Shut down transmitters and power supply.
️· INVALID: Indicates valid signal level on receiver inputs.
️· R1OUTB: Always-active non-inverting receiver output.

## Shutdown Function
️· Enters shutdown mode when no valid RS-232 signal is detected, reducing current consumption to 1µA.
️· Can be forced into shutdown via the FORCEOFF pin.
️· Automatic restart when a valid signal is present.

## Ordering Information
️· UT3238G-P28-R: TSSOP-28 package, Tape Reel

## Absolute Maximum Ratings
️· VCC: 6.0V
️· Operating Temperature: -40°C to +85°C
️· Storage Temperature: -65°C to +150°C

## Electrical Characteristics (Typical)
️· Shutdown Current: 1µA
️· Supply Current: 0.5-2.0 mA
️· Data Rate: 250 kbps