Product details

Drivers per package 1 Receivers per package 1 Logic voltage (Min) (V) 3.3 Data rate (Max) (kbps) 250 Main supply voltage (Nom) (V) 3.3, 5 Features Auto-Powerdown ESD HBM (kV) 15 Rating Catalog Operating temperature range (C) -40 to 85, 0 to 70 Vout (Typ) (V) 5.4
Drivers per package 1 Receivers per package 1 Logic voltage (Min) (V) 3.3 Data rate (Max) (kbps) 250 Main supply voltage (Nom) (V) 3.3, 5 Features Auto-Powerdown ESD HBM (kV) 15 Rating Catalog Operating temperature range (C) -40 to 85, 0 to 70 Vout (Typ) (V) 5.4
SSOP (DB) 16 48 mm² 6.2 x 7.8 TSSOP (PW) 16 22 mm² 4.4 x 5 TSSOP (PW) 16 22 mm² 5 x 4.4 VQFN (RGT) 16 9 mm² 3 x 3
  • ESD Protection for RS-232 Pins
    • ±15-kV Human-Body Model (HBM)
    • ±8 kV (IEC 61000-4-2, contact discharge)
    • ±15 kV (IEC 61000-4-2, air-gap discharge)
  • Meets or exceeds the requirements of TIA/EIA-232-F and ITU v.28 standards
  • Operates with 3-V to 5.5-V VCC supply
  • Operates up to 250 kbit/s
  • One driver and one receiver
  • Near chip-scale package, 16-pin VQFN (RGT, 82% smaller than TSSOP package)
  • Low standby current: 1 µA Typical
  • External capacitors: 4 × 0.1 µF
  • Accepts 5-V logic input with 3.3-V supply
  • Alternative high-speed pin-compatible device (1 Mbit/s)
    • TRSF3221E
  • Auto-powerdown feature automatically disables drivers for power savings
  • ESD Protection for RS-232 Pins
    • ±15-kV Human-Body Model (HBM)
    • ±8 kV (IEC 61000-4-2, contact discharge)
    • ±15 kV (IEC 61000-4-2, air-gap discharge)
  • Meets or exceeds the requirements of TIA/EIA-232-F and ITU v.28 standards
  • Operates with 3-V to 5.5-V VCC supply
  • Operates up to 250 kbit/s
  • One driver and one receiver
  • Near chip-scale package, 16-pin VQFN (RGT, 82% smaller than TSSOP package)
  • Low standby current: 1 µA Typical
  • External capacitors: 4 × 0.1 µF
  • Accepts 5-V logic input with 3.3-V supply
  • Alternative high-speed pin-compatible device (1 Mbit/s)
    • TRSF3221E
  • Auto-powerdown feature automatically disables drivers for power savings

The TRS3221E is a single driver, single receiver RS-232 solution operating from a single VCC supply. The RS-232 pins provide IEC G1000-4-2 ESD protection. The device meets the requirements of TIA/EIA-232-F and provides the electrical interface between an asynchronous communication controller and the serial-port connector. The charge pump and four small external capacitors allow operation from a single 3-V to 5.5-V supply. These devices operate at data signaling rates up to 250 kbit/s and a maximum of 30-V/µs driver output slew rate.

Flexible control options for power management are available when the serial port is inactive. The auto-powerdown feature functions when FORCEON is low and FORCEOFF is high. During this mode of operation, if the device does not sense a valid RS-232 signal on the receiver input, the driver output is disabled. If FORCEOFF is set low and EN is high, both the driver and receiver are shut off, and the supply current is reduced to 1 µA. Disconnecting the serial port or turning off the peripheral drivers causes the auto-powerdown condition to occur. Auto-powerdown can be disabled when FORCEON and FORCEOFF are high.

With auto-powerdown enabled, the device is activated automatically when a valid signal is applied to the receiver input. The INVALID output notifies the user if an RS-232 signal is present at the receiver input. INVALID is high (valid data) if the receiver input voltage is greater than 2.7 V or less than –2.7 V, or has been between –0.3 V and 0.3 V for less than 30 µs. INVALID is low (invalid data) if the receiver input voltage is between –0.3 V and 0.3 V for more than 30 µs. Refer to Figure 7-5 for receiver input levels.

The TRS3221E is a single driver, single receiver RS-232 solution operating from a single VCC supply. The RS-232 pins provide IEC G1000-4-2 ESD protection. The device meets the requirements of TIA/EIA-232-F and provides the electrical interface between an asynchronous communication controller and the serial-port connector. The charge pump and four small external capacitors allow operation from a single 3-V to 5.5-V supply. These devices operate at data signaling rates up to 250 kbit/s and a maximum of 30-V/µs driver output slew rate.

Flexible control options for power management are available when the serial port is inactive. The auto-powerdown feature functions when FORCEON is low and FORCEOFF is high. During this mode of operation, if the device does not sense a valid RS-232 signal on the receiver input, the driver output is disabled. If FORCEOFF is set low and EN is high, both the driver and receiver are shut off, and the supply current is reduced to 1 µA. Disconnecting the serial port or turning off the peripheral drivers causes the auto-powerdown condition to occur. Auto-powerdown can be disabled when FORCEON and FORCEOFF are high.

With auto-powerdown enabled, the device is activated automatically when a valid signal is applied to the receiver input. The INVALID output notifies the user if an RS-232 signal is present at the receiver input. INVALID is high (valid data) if the receiver input voltage is greater than 2.7 V or less than –2.7 V, or has been between –0.3 V and 0.3 V for less than 30 µs. INVALID is low (invalid data) if the receiver input voltage is between –0.3 V and 0.3 V for more than 30 µs. Refer to Figure 7-5 for receiver input levels.

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Technical documentation

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Type Title Date
* Data sheet TRS3221E 3-V TO 5.5-V Single-Channel RS-232 Line Driver/Receiver with ±15-kV IEC ESD Protection In Small Package datasheet (Rev. B) 16 Jul 2021
User guide TRS3221 EVM User's Guide 10 Nov 2020
Application note AN-438 Low Power RS-232C Driver and Receiver in CMOS (Rev. B) 26 Apr 2013
Application note Understanding Power Requirements in RS-232 Applications (Rev. B) 26 Apr 2013
Application note Removing Ground Noise in Data Transmission Systems 05 Oct 2007
More literature RS-232 IEC ESD-Protected Devices From TI (Rev. A) 27 Jul 2007
Application note Interface Circuits for TIA/EIA-232-F (Rev. A) 19 Sep 2002
Application note Low-Voltage, Single-Supply 232-Standard Interface Solutions (Rev. A) 19 Sep 2000

Design & development

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Evaluation board

TRS3221RGTEVM — TRS3221EIRGTR multichannel RS-232 line driver/receiver with ESD protection evaluation module

This evaluation module is used to evaluate the TRS3221E or TRSF3221E with RGT package. All signals are available through headers and test points. The charge pump output V+ and V- are accessible too. The board interfaces data and control CMOS logic levels on the terminal block to RS-232 levels (...)

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Simulation model

TRS3221E IBIS Model

SLLM457.ZIP (94 KB) - IBIS Model
Simulation tool

PSPICE-FOR-TI — PSpice® for TI design and simulation tool

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 (...)
Simulation tool

TINA-TI — SPICE-based analog simulation program

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 (...)
Reference designs

TIDA-060008 — Reference Design for Converting RS-232 Signaling to RS-485 Signaling

This reference design provides a circuit of converting RS-232 signaling to RS-485 signaling. This allows for long-distance communication, since the range supported by RS-232 is normally less than 50 feet while the range for RS-485's can exceed 1000 feet. The design implements bidirectional (...)
Package Pins Download
SSOP (DB) 16 View options
TSSOP (PW) 16 View options
VQFN (RGT) 16 View options

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