General Description
The UM3221E/UM3222E/UM3232E series are 3.3V powered RS-232 transceivers intended for portable or hand-held applications. The UM3221E has one driver/one receiver while the UM3222E/UM3232E has two drivers/two receivers. The device features low power consumption, high data-rate capability and enhanced ESD protection. The ESD rating of all transmitter outputs and receiver inputs is ±15kV for both human body mode and IEC61000-4-2 air discharge methods, and over ±8kV for IEC61000-4-2 contact discharge methods. The logic I/O pins are protected to ±2kV for human body mode.

FEATUREs
● Meets True EIA/TIA-232-F Standards from a
   +3.0V to +5.5V Power Supply
● Meets EIA/TIA-562 Levels of ±3.7V with
   Supply Voltages as Low as 2.7V
● Enhanced ESD Specifications:
   ±15kV Human Body Mode
   ±15kV IEC61000-4-2 Air Discharge Mode
   ±8kV IEC61000-4-2 Contact Discharge Mode
● 1μA Low Power Shutdown
   (UM3221E/UM3222E)
● 250kbps Minimum Transmission Rate
● Guaranteed 30V/μs Max Slew Rate
● Latch-Up Performance Exceeds 200mA
● Hot Swap and Fail-Safe
● I/O Logic Compatible with 1.8V Logic @
   VCC=3.3V

APPLICATIONs
● Industrial Automation Equipments
● Battery-Powered Equipments
● Hand-Held Equipments
● POS Terminals