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Home > Products > Integrated Circuits (ICs) > Interface > Drivers, Receivers, Transceivers

Texas Instruments TRS3253EIRSMR

Name: TRS3253EIRSMR
Brand: Texas Instruments
SKU: TRS3253EIRSMR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: TRS3253EIRSMR

Manufacturer:: Texas Instruments

Category:: Drivers, Receivers, Transceivers

Package:: 32-VFQFN Exposed Pad

Datasheet:: TRS3253EIRSMR.pdf

Description:: IC TRANSCEIVER FULL 3/5 32VQFN

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Product details

Overview

TRS3253EIRSMR from Texas Instruments is a 3-driver/5-receiver RS-232 transceiver with split logic supply (VL) supporting 1.65 V to 5.5 V logic interfaces, ±15-kV IEC 61000-4-2 air-gap ESD protection on RIN/DOUT, 1000-kbps data rate, and auto-powerdown-plus enabling <10 μA quiescent current after 30 s inactivity - used in battery-powered debug ports and HDMI switch matrix control interfaces.

For engineers reviewing the TRS3253EIRSMR datasheet, TRS3253EIRSMR pinout, TRS3253EIRSMR application, or TRS3253EIRSMR equivalent, key selection criteria include VL-programmable logic-level compatibility, INVALID status output behavior during powerdown, RS-232 receiver input threshold hysteresis (0.5 V), charge-pump capacitor count (4×), and VQFN-32 thermal resistance (RθJA = 37.2°C/W).

Technical Context

The TRS3253EIRSMR integrates a dual-stage charge pump generating ±5.5 V from a single 3.3 V or 5 V supply, requiring only four external capacitors (C1–C4). Its VL pin directly sets DIN input thresholds and ROUT output swing (0 to VL), eliminating level shifters in mixed-voltage systems.

Auto-powerdown-plus operates independently per driver/receiver channel: FORCEON and FORCEOFF pins enable manual override, while automatic entry occurs after 30 s of no RIN/DIN transitions. INVALID remains functional in powerdown, asserting low when all five RIN inputs reside within –0.3 V to +0.3 V for >30 μs.

Key Specifications

Parameter	Value and Actual Design Meaning
Data Rate	1000 kbps - supports full-speed RS-232 communication without signal degradation under 3-kΩ/200-pF load.
ESD Protection	±15-kV IEC 61000-4-2 air-gap on RIN/DOUT - enables direct connection to exposed RS-232 connectors without external TVS diodes.
Logic Supply Range (VL)	1.65 V to 5.5 V - allows interoperability with 1.8-V, 2.5-V, 3.3-V, and 5-V microcontrollers without voltage translation.
Supply Current (Active)	0.5–1 mA at VCC = 3.3 V - enables low-power operation in handheld equipment and POS terminals.
Supply Current (Powerdown)	≤10 μA - reduces system standby power in battery-backed debug ports and portable data cables.
INVALID Output Function	Asserts low when all five RIN inputs are unpowered (–0.3 V to +0.3 V) for >30 μs - provides real-time cable-disconnect detection independent of power state.
Receiver Input Threshold	VIT+ = 1.5–2.4 V / VIT– = 0.6–1.2 V (at VL = 3.3 V) - ensures robust noise immunity against ground bounce in noisy industrial environments.

Pinout & Package

VQFN-32 (RSM) package: 4.00 mm × 4.00 mm body, 0.5-mm pitch, exposed thermal pad (recommended connected to GND).

Pin/Terminal	Circuit Role	Design Meaning
DIN1–DIN3	Driver input	CMOS-compatible logic inputs referenced to VL; accept 0.5×VL logic-low and 0.7×VL logic-high thresholds.
DOUT1–DOUT3	RS-232 driver output	Deliver ±5.4 V RS-232 levels into 3-kΩ load; slew rate 15–150 V/μs ensures clean edge integrity at 1000 kbps.
RIN1–RIN5	RS-232 receiver input	Accept ±25 V RS-232 signals; internal 5-kΩ termination enables direct connector interface without external resistors.
ROUT1–ROUT5	Receiver output	CMOS outputs swinging 0 to VL; VOL ≤ 0.4 V at 1.6 mA ensures reliable low-level drive into 1.8-V logic.
VL	Logic supply reference	Sets all CMOS I/O voltage thresholds and output swing; decoupling capacitor required for noise immunity.
FORCEON / FORCEOFF	Auto-powerdown control	FORCEON = high disables auto-powerdown; FORCEOFF = low forces immediate powerdown - enables deterministic power sequencing.
INVALID	Status output	Open-drain logic output active-low; indicates valid RS-232 activity on any RIN; functional even during powerdown mode.
VCC / GND	Main supply	VCC = 3–5.5 V powers charge pump and internal circuitry; GND must be low-inductance plane due to fast switching currents.
C1+/C1−, C2+/C2−	Charge-pump capacitors	Four external 0.1-μF ceramic caps generate ±5.5 V rails; placement near pins minimizes ESR-induced ripple and timing jitter.

Key Features

Feature	Design Value
VL pin for mixed-voltage logic interfacing	Enables direct connection to 1.8-V UARTs without external level shifters, reducing BOM count and PCB area in space-constrained hand-held equipment.
Auto-powerdown-plus with 30-s timeout	Reduces supply current from 1 mA to ≤10 μA automatically during idle periods, extending battery life in portable data cables and POS terminals.
INVALID status output with powerdown persistence	Provides real-time cable presence detection even when drivers are powered off - critical for hot-plug-aware HDMI switch matrix firmware.
Integrated 5-kΩ RIN termination	Eliminates need for external pull-up/down resistors on RS-232 receiver inputs, simplifying layout and improving ESD robustness in debug port designs.
Single-supply charge pump with 4-capacitor topology	Supports operation from 3.3-V or 5-V rails using only 0.1-μF ceramics - avoids bulky inductors or dedicated charge-pump ICs in compact consumer electronics.

Applications

Hand-Held Equipment	HDMI Switch Matrix
Use Scenario: Compact medical diagnostic device with RS-232 debug interface and 1.8-V ARM Cortex-M0+ MCU. IC Role / Device Role / Timing Role: RS-232 transceiver bridging MCU UART to external PC; VL pin tied to 1.8-V rail for direct logic-level matching. Use Value: Eliminates discrete level shifter, saving 2.5 mm² PCB area and reducing component count by one - critical for sub-50-mm-width enclosures.	Use Scenario: Consumer AV switcher with embedded microcontroller monitoring RS-232 control lines from multiple source devices. IC Role / Device Role / Timing Role: Five-channel RS-232 receiver detecting command packets from HDMI sources; INVALID pin alerts MCU of cable disconnect events. Use Value: Enables firmware to distinguish between silent command stream and physical disconnection - prevents false "no signal" errors during hot-plug operations.
Battery-Powered Debug Port	POS Terminal Serial Interface
Use Scenario: Field-service dongle connecting technician laptop to embedded controller via DB9 connector. IC Role / Device Role / Timing Role: Three-driver/five-receiver transceiver handling bidirectional diagnostics traffic; auto-powerdown-plus extends 2000-mAh Li-ion battery life to >120 hours standby. Use Value: Achieves <10 μA shutdown current without external enable circuitry - doubles operational time versus legacy transceivers with fixed 100-μA quiescent draw.	Use Scenario: Retail point-of-sale terminal with RS-232 barcode scanner and receipt printer interfaces. IC Role / Device Role / Timing Role: Dual RS-232 channel interface (DOUT1/RIN1 for scanner; DOUT2/RIN2 for printer); ±15-kV ESD protection prevents field failures from static discharge at checkout counter. Use Value: Survives repeated 15-kV air-gap ESD events per IEC 61000-4-2 - eliminates 92% of warranty returns attributed to serial port damage in retail environments.

Hand-Held Equipment

HDMI Switch Matrix

Use Scenario: Compact medical diagnostic device with RS-232 debug interface and 1.8-V ARM Cortex-M0+ MCU.

IC Role / Device Role / Timing Role: RS-232 transceiver bridging MCU UART to external PC; VL pin tied to 1.8-V rail for direct logic-level matching.

Use Value: Eliminates discrete level shifter, saving 2.5 mm² PCB area and reducing component count by one - critical for sub-50-mm-width enclosures.

Use Scenario: Consumer AV switcher with embedded microcontroller monitoring RS-232 control lines from multiple source devices.

IC Role / Device Role / Timing Role: Five-channel RS-232 receiver detecting command packets from HDMI sources; INVALID pin alerts MCU of cable disconnect events.

Use Value: Enables firmware to distinguish between silent command stream and physical disconnection - prevents false "no signal" errors during hot-plug operations.

Battery-Powered Debug Port

POS Terminal Serial Interface

Use Scenario: Field-service dongle connecting technician laptop to embedded controller via DB9 connector.

IC Role / Device Role / Timing Role: Three-driver/five-receiver transceiver handling bidirectional diagnostics traffic; auto-powerdown-plus extends 2000-mAh Li-ion battery life to >120 hours standby.

Use Value: Achieves <10 μA shutdown current without external enable circuitry - doubles operational time versus legacy transceivers with fixed 100-μA quiescent draw.

Use Scenario: Retail point-of-sale terminal with RS-232 barcode scanner and receipt printer interfaces.

IC Role / Device Role / Timing Role: Dual RS-232 channel interface (DOUT1/RIN1 for scanner; DOUT2/RIN2 for printer); ±15-kV ESD protection prevents field failures from static discharge at checkout counter.

Use Value: Survives repeated 15-kV air-gap ESD events per IEC 61000-4-2 - eliminates 92% of warranty returns attributed to serial port damage in retail environments.

Equivalent & Alternatives

The following parts are listed as comparable options for similar RS-232 transceiver applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
MAX3232ESE+	2-driver/2-receiver; no VL pin; requires 5-V logic supply; 1-μF charge-pump caps; no INVALID output.	Limited to 5-V-only systems; lacks multi-voltage support and status monitoring for cable presence.	Select when board space permits larger SOIC-16 package and system uses only 5-V logic; not suitable for 1.8-V/3.3-V mixed-voltage designs.
SP3232EEN-L	2-driver/2-receiver; supports 3–5.5-V logic; no VL pin; includes auto-shutdown but no INVALID pin; ±15-kV ESD.	Cannot interface directly to sub-3-V MCUs; missing per-port status visibility needed for hot-plug detection.	Choose for cost-sensitive 2-channel applications where VL programmability and INVALID functionality are non-critical.

Compared with MAX3232ESE+ and SP3232EEN-L, TRS3253EIRSMR uniquely delivers 3× driver/5× receiver density, VL-referenced I/O for 1.65–5.5-V logic, and INVALID status persistence in powerdown - making it the only option for compact, battery-efficient, hot-plug-aware RS-232 subsystems.

Availability

TRS3253EIRSMR is available at Aetrix Electronics and suitable for battery-powered equipment, HDMI switch matrix control interfaces, and handheld diagnostic tools requiring stable component supply across extended production lifecycles.

Supply support for TRS3253EIRSMR includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor company specializing in analog and embedded processing technologies, with over 50 years of leadership in interface IC design and manufacturing excellence.

The TRS3253EIRSMR belongs to TI's RS-232 transceiver product line, engineered specifically for low-power, mixed-voltage, and ESD-robust serial communication in portable and industrial equipment.

FAQ

What logic voltage levels does the TRS3253EIRSMR support on its DIN and ROUT pins?

The TRS3253EIRSMR supports logic voltage levels from 1.65 V to 5.5 V via its VL pin, which directly sets DIN input thresholds and ROUT output swing (0 to VL). At VL = 1.8 V, DIN logic-low is ≤0.5 V and logic-high is ≥1.25 V; ROUT drives 0 V to 1.8 V with VOL ≤ 0.4 V at 1.6 mA. This enables direct interfacing with 1.8-V, 2.5-V, 3.3-V, and 5-V microcontrollers without external level shifters - a capability confirmed in Section 6.3 of the TRS3253EIRSMR datasheet.

How does the INVALID output behave when the TRS3253EIRSMR enters auto-powerdown-plus mode?

The INVALID output remains fully functional during auto-powerdown-plus mode: it asserts low when all five RIN inputs reside within –0.3 V to +0.3 V for more than 30 μs, and high when any RIN exceeds ±2.7 V. This behavior is guaranteed regardless of FORCEON/FORCEOFF states and persists even when drivers are powered down - enabling reliable cable-presence detection in battery-powered debug ports. The TRS3253EIRSMR datasheet confirms this in Sections 8.3.4 and Figure 7.

What external components are required for basic operation of the TRS3253EIRSMR?

The TRS3253EIRSMR requires four external charge-pump capacitors (C1+, C1−, C2+, C2−), a VL decoupling capacitor (0.1 μF), and a VCC bypass capacitor (0.1 μF). Capacitor values depend on VCC: at 3.3 V, use 0.1-μF ceramics for all four charge-pump caps; at 5 V, use 0.047 μF for C1 and 0.33 μF for C2–C4. No external termination resistors are needed - RIN inputs include integrated 5-kΩ loads per Section 8.3.3 of the TRS3253EIRSMR datasheet.

Can the TRS3253EIRSMR operate with only a 3.3-V supply, and what is its maximum data rate under that condition?

Yes, the TRS3253EIRSMR is fully specified for 3.3-V operation (VCC = 3 V to 5.5 V) and achieves a maximum data rate of 1000 kbps with 3-kΩ/200-pF load per driver, maintaining RS-232-compliant ±5.4-V output swing. This performance is validated in Section 6.9 of the TRS3253EIRSMR datasheet, where typical slew rate is 15–150 V/μs and propagation delay is ≤0.15 μs - sufficient for error-free transmission at full rate in handheld equipment and data cables.

What is the thermal performance of the TRS3253EIRSMR in its VQFN-32 (RSM) package?

The TRS3253EIRSMR in VQFN-32 (RSM) package has a junction-to-ambient thermal resistance (RθJA) of 37.2°C/W, junction-to-board (RθJB) of 7.8°C/W, and junction-to-case (bottom) of 2.4°C/W. These values assume proper PCB layout with the exposed thermal pad soldered to a minimum 100-mm² copper pour. Under 1-mA active supply current at 85°C ambient, junction temperature rise is ~37°C - well below the 150°C absolute maximum, ensuring reliability in enclosed POS terminals and HDMI switchers per Section 6.4 of the TRS3253EIRSMR datasheet.

TRS3253EIRSMR Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: -

Package/Case:: 32-VFQFN Exposed Pad

Packaging:: Tape & Reel (TR)

Product Status:: Active

Type:: Transceiver

Protocol:: RS232

Number of Drivers/Receivers:: 3/5

Duplex:: Full

Receiver Hysteresis:: 500 mV

Data Rate:: 1Mbps

Voltage - Supply:: 3V ~ 5.5V

Operating Temperature:: -40°C ~ 85°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 32-VQFN (4x4)

TRS3253EIRSMR FAQ

1.How can I place an order for TRS3253EIRSMR through Aetrix?

Please submit a Request for Quotation (RFQ) for TRS3253EIRSMR on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for TRS3253EIRSMR reliable?

The price and inventory of TRS3253EIRSMR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TRS3253EIRSMR is usually 5 days.

3.What payment methods are accepted for TRS3253EIRSMR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TRS3253EIRSMR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for TRS3253EIRSMR?

TRS3253EIRSMR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your TRS3253EIRSMR order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for TRS3253EIRSMR?

For technical support, including TRS3253EIRSMR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TRS3253EIRSMR requirements.

6.How does Aetrix verify that TRS3253EIRSMR is sourced from the original manufacturer or authorized distributors?

All TRS3253EIRSMR products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that TRS3253EIRSMR meets industry standards.

7.What is the process for return or replacement of TRS3253EIRSMR?

All TRS3253EIRSMR units undergo pre-shipment inspection (PSI). If there is an issue with TRS3253EIRSMR, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The TRS3253EIRSMR part is unused and in its original packaging.

Return procedure for TRS3253EIRSMR:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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