Product details


Drivers per package 2 Receivers per package 2 Logic voltage (Min) (V) 1.65 Data rate (Max) (kbps) 1000 Main supply voltage (Nom) (V) 1.65 - 5.5 Features Auto-Powerdown Plus ESD HBM (kV) 15 Rating Catalog Operating temperature range (C) -40 to 85 Vout (Typ) (V) 5.4 open-in-new Find other RS-232 transceivers

Package | Pins | Size

VQFN (RGE) 24 16 mm² 4 x 4 open-in-new Find other RS-232 transceivers


  • 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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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.

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Technical documentation

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Type Title Date
* Data sheet TRS3122E 1.8 V Low Power Dual RS-232 Transceiver datasheet (Rev. C) May 13, 2016
User guide RS232 BoosterPack™ Getting Started Guide Dec. 08, 2016
Application note Designing with the TRS3122E (Rev. A) Jul. 23, 2016
User guide TRS3122EEVM User's Guide Mar. 16, 2016

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Hardware development

document-generic User guide

The BOOSTXL-RS232 is a BoosterPack™ Plug-in Module for a TI LaunchPad™ Development Kit. The BOOSTXL-RS232 enables quick RS-232 prototyping with the TRS3122E, the industry’s first 1.8-V inductor-less low-power RS-232 transceiver. The board is equipped with a DB-9 (...)

  • Auto-powerdown plus
  • Low 0.5-µA shutdown current
  • Capable of translating 1v8 or 3v3 TTL logic to ± 5-V RS-232 signal
  • Dual channel allows for serial RX/TX and flow control (CTS/RTS)
  • DB-9 port connection monitoring
  • Compatible with a wide range of TI LaunchPads
  • On board LEDs connected to RS-232 signal paths
document-generic User guide
The TRS3122EEVM is an evaluation module for the TRS3122E, a 1.8V high-speed RS-232 transceiver. The module enables device evaluation using the installed DB-9 connector and terminal block. The board can be set in a loopback state for very simple evaluation or operated in tandem with diagnostic (...)
  • Interface with MCUs or processors from 1.65 V up to 5.5V
  • High-speed RS-232 communication, up to 1Mbps
  • Autopower down plus for very low power consumption (1µA) during shutdown
  • Robust IEC61000-4-2 qualification enables human-interfaced applications
  • Very small QFN package saves board space and cost

Design tools & simulation

SLLM309.ZIP (102 KB) - IBIS Model
PSpice® for TI design and simulation tool
PSPICE-FOR-TI — PSpice® for TI is a design and simulation environment that helps evaluate functionality of analog circuits. This full-featured, design and simulation suite uses an analog analysis engine from Cadence®. Available at no cost, PSpice for TI includes one of the largest model libraries in the (...)
  • Leverages Cadence PSpice Technology
  • Preinstalled library with a suite of digital models to enable worst-case timing analysis
  • Dynamic updates ensure you have access to most current device models
  • Optimized for simulation speed without loss of accuracy
  • Supports simultaneous analysis of multiple products
  • (...)
SPICE-based analog simulation program
TINA-TI TINA-TI provides all the conventional DC, transient and frequency domain analysis of SPICE and much more. TINA has extensive post-processing capability that allows you to format results the way you want them. Virtual instruments allow you to select input waveforms and probe circuit nodes voltages (...)
document-generic User guide

Reference designs

Isolated RS-232 With Integrated Signal and Power Reference Design
TIDA-01230 — The TIDA-01230 reference design provides a compact solution capable of generating isolated DC power while supporting isolated RS-232 communication. The design consists of a reinforced digital isolator with integrated power combined with an RS-232 communication transceiver.
document-generic Schematic

CAD/CAE symbols

Package Pins Download
VQFN (RGE) 24 View options

Ordering & quality

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