TRS3122E 2Tx/2Rx Low Voltage, Low Power RS232 Transceiver |

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2Tx/2Rx Low Voltage, Low Power RS232 Transceiver



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 VL pin that allows operation in mixed-logic voltage systems. Both driver in (DIN) and receiver out (ROUT) logic levels are pin programmable through the VL 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.


  • Extended VCC operating nodes: 1.8 V, 3.3 V, or
    5.0 V
    • Unique Tripler Charge Pump Architecture
      Enables Low VCC 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


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Part number Order Drivers per package Receivers per package Logic voltage (Min) (V) Data rate (Max) (kbps) Main supply voltage (Nom) (V) Features ESD HBM (kV) Rating Operating temperature range (C) Package Group
TRS3122E Order now 2     2     1.65     1000     1.65 - 5.5     Auto-Powerdown Plus     15     Catalog     -40 to 85     VQFN | 24