TRS3122E

• Extended V_CC operating nodes: 1.8 V, 3.3 V, or
  5.0 V
  • Unique Tripler Charge Pump Architecture
    Enables Low V_CC of 1.8V While Maintaining
    Compatibility with 3.3 V and 5 V 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 RIN Inputs and
  DOUT Outputs
  • ±15 kV IEC 61000-4-2 Air-Gap Discharge
  • ±8 kV IEC 61000-4-2 Contact Discharge
  • ±15 kV Human-Body Model
• Specified 1000-kbps Data Rate
• Auto Powerdown Plus Feature
• Low 0.5µA Shutdown Supply Current
• Meets or Exceeds Compatibility Requirements of
  RS-232 Interface
• For 2.5 V Single Supply Applications, Consider
  TRS3318E as an Optimized Solution

The TRS3122E 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 ±15 kV using the IEC 61000-4-2 Air-Gap Discharge method, ±8 kV using the IEC 61000-4-2 Contact Discharge method, and ±15 kV using the Human-Body Model.

The charge pump requires five small 0.1-µF capacitors for operation from as low as a 1.8-V supply. The TRS3122E is capable of running at data rates up to 1000 kbps, while maintaining RS-232-compatible output levels.

The TRS3122E has a unique V_L pin that allows operation in mixed-logic voltage systems. Both driver in (DIN) and receiver out (ROUT) 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.