# UT3243 CMOS IC

## Overview
The UT3243 is a 3-driver, 5-receiver RS-232 line transceiver designed for notebook computers and operates from +3.0V to +5.5V. It supports data rates up to 235kbps and features a low-power shutdown mode with 1µA current consumption.

## Features
️· Power Supply: +3.0V to +5.5V
️· Drivers/Receivers: 3 Drivers, 5 Receivers
️· Data Rate: Up to 235 kbps
️· Standby Current: 1µA (typical)
️· External Capacitors: Requires 4 x 0.1µF capacitors
️· Logic Input: Accepts 5.0V logic with 3.3V supply
️· Always-Active Receiver: R2OUTB for monitoring in shutdown
️· ESD Protection: ±8kV (HBM)

## Pin Configuration
️· C1+, C1-, C2+, C2-: Charge pump capacitors
️· RXIN (R1IN-R5IN): RS-232 receiver inputs
️· TXOUT (T1OUT-T3OUT): RS-232 transmitter outputs
️· TXIN (T1IN-T3IN): TTL/CMOS transmitter inputs
️· RXOUT (R1OUT-R5OUT): TTL/CMOS receiver outputs
️· R2OUTB: Always-active non-inverting receiver output
️· FORCEON: Override for transmitter activation.
️· FORCEOFF: Shutdown control; drives low to disable.
️· VCC: +3.0V to +5.5V supply voltage

## Electrical Characteristics
️· Supply Current (Shutdown): 1µA (typical)
️· Data Rate: 120kbps (guaranteed), 235kbps (typical)
️· Input Voltage Range (R_IN): ±25V
️· Output Voltage Swing (T_OUT): ±4.8V to ±5.4V

## Shutdown Function
️· Enters shutdown when no valid signal is detected on receiver inputs, reducing current consumption to 1µA.
️· FORCEON/FORCEOFF pins override automatic shutdown control.

## Ordering Information
️· Package Options: TSSOP-28, SSOP-28
️· Packing Options: Tube, Tape Reel
️· Lead/Halogen Options: Lead-Free (L), Halogen-Free (G)