The UM3122EEQA is a two-driver and two-receiver RS-232 interface device, with split supply pins for mixed-voltage operation. All RS-232 inputs and outputs are protected to ±15kV using the IEC 61000-4-2 Air-Gap Discharge method, ±8kV using the IEC 61000-4-2 Contact Discharge method, and ±8kV using the Human-Body Model. The charge pump requires five small 0.1μF capacitors for operation from as low as a 1.8V supply. The UM3122EEQA is capable of running at data rates up to 1000 kbps, while maintaining RS-232 compatible output levels. The UM3122EEQA has a unique V_L pin that allows operation in mixed-logic voltage systems. Both driver in (D_IN) and receiver out (R_OUT) logic levels are pin programmable through the V_L pin. This eliminates the need for additional voltage level shifter while interfacing with low-voltage microcontrollers or UARTs. Auto Powerdown Plus automatically places the device in a low power mode when the device has not received or transmitted data for more than 30 seconds. This feature makes this device a very attractive option for battery powered or other power sensitive applications.

  Enables Low V_CC of 1.8V While Maintaining Compatibility with 3.3V and 5V Supplies

- Integrated Level-Shifting Functionality Eliminates the Need for External Power or Additional Level Shifter While Interfacing with Low-Voltage MCUs

- Enhanced ESD Protection on R_IN Inputs and D_OUT Outputs

  ±15kV IEC 61000-4-2 Air-Gap Discharge

  ±8kV IEC 61000-4-2 Contact Discharge

  ±8kV Human-Body Model

- Specified 1000 kbps Data Rate

- Auto Powerdown Plus Feature

- Low 0.5uA Shutdown Supply Current