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Texas Instruments TRS3221EIRGTR
- Part No.:
- TRS3221EIRGTR
- Manufacturer:
- Texas Instruments
- Category:
- Drivers, Receivers, Transceivers
- Package:
- 16-VFQFN Exposed Pad
- Datasheet:
-
TRS3221EIRGTR.pdf
- Description:
- IC TRANSCEIVER FULL 1/1 16VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,105
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Product details
Overview
TRS3221EIRGTR from Texas Instruments is a single-channel RS-232 line driver and receiver IC operating from 3V to 5.5V VCC, delivering ±15kV IEC 61000-4-2 ESD protection on RS-232 pins, supporting up to 250 kbit/s data rate, and featuring auto-powerdown with 1 μA standby current. It enables robust serial communication in space-constrained portable systems.
For engineers reviewing the TRS3221EIRGTR datasheet, TRS3221EIRGTR pinout, TRS3221EIRGTR application, or TRS3221EIRGTR equivalent, key selection criteria include its VQFN-16 (RGT) package size (3 mm × 3 mm), ±15kV air-gap ESD rating, INVALID status output logic behavior, and compatibility with 0.1 μF external charge-pump capacitors for single-supply operation.
Technical Context
The TRS3221EIRGTR integrates a voltage-doubler/inverter charge pump generating ±5.5V rails from a single 3V–5.5V supply, enabling full RS-232 voltage compliance without dual supplies. Its driver delivers ±5.4V output swing into 3 kΩ load, while the receiver accepts ±25V input and provides TTL/CMOS-compatible ROUT output.
Auto-powerdown is controlled via FORCEON/FORCEOFF logic inputs and triggered by absence of valid RS-232 signal (>30 μs within –0.3V to +0.3V at RIN), reducing ICC to ≤10 μA. The INVALID output asserts high when |RIN| > 2.7V or transitions outside ±0.3V for <30 μs, providing real-time signal presence detection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 3V to 5.5V - Enables direct interface with 3.3V or 5V system logic without level-shifting. |
| Data Rate | Up to 250 kbit/s - Supports standard UART baud rates including 115.2 kbit/s with margin for noise immunity. |
| ESD Protection | ±15kV IEC 61000-4-2 air-gap - Protects against electrostatic discharge at physical RS-232 connectors in industrial or handheld environments. |
| Standby Current | 1 μA typical - Achieved during auto-powerdown mode, critical for battery life in portable equipment. |
| External Capacitors | 4 × 0.1 μF ceramic - Minimizes board area and cost vs. larger electrolytic/tantalum alternatives required by legacy RS-232 transceivers. |
| INVALID Output Logic | High = valid RS-232 signal (|RIN| > 2.7V or transient within ±0.3V < 30 μs) - Enables host MCU to detect cable attachment or line activity without polling. |
| Package | VQFN-16 (RGT), 3 mm × 3 mm - 82% smaller than TSSOP, suitable for ultra-compact PCB layouts in notebooks and PDAs. |
Pinout & Package
VQFN-16 (RGT) package with exposed thermal pad; 3 mm × 3 mm footprint, 0.5 mm pitch, leadless construction optimized for thermal performance and board density.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - EN | Receiver enable control input | Low enables ROUT output; high places ROUT in high-impedance state - allows shared bus or power-gating of receiver path. |
| 2 - C1+ | Charge-pump capacitor positive terminal | Connects to 0.1 μF capacitor between C1+ and C1− to form voltage-doubler stage for +5.5V rail generation. |
| 3 - V+ | Positive charge-pump output | Supplies +5.5V to driver stage; must be decoupled with 0.1 μF capacitor to GND for stable RS-232 output levels. |
| 4 - C1− | Charge-pump capacitor negative terminal | Completes doubler circuit with C1+; polarity-insensitive ceramic capacitor recommended. |
| 5 - C2+ | Charge-pump capacitor positive terminal | Connects to 0.1 μF capacitor between C2+ and C2− to form inverter stage for −5.5V rail generation. |
| 6 - C2− | Charge-pump capacitor negative terminal | Completes inverter circuit with C2+; forms negative supply rail essential for compliant RS-232 driver swing. |
| 7 - V− | Negative charge-pump output | Supplies −5.5V to driver stage; requires local 0.1 μF decoupling to ensure clean negative rail under dynamic load. |
| 8 - RIN | RS-232 receiver input | Accepts ±25V RS-232 signals; internal 5 kΩ termination enables direct connection to DB9 connector without external resistors. |
| 9 - ROUT | Receiver logic-level output | CMOS/TTL-compatible output (VOL ≤ 0.4V, VOH ≥ VCC−0.6V); driven only when EN = low - supports logic-level interfacing to UART RX. |
| 10 - INVALID | Signal presence indicator | Open-drain or push-pull output (per config); goes high when RIN detects valid RS-232 level - used for wake-up or link-status monitoring. |
| 11 - DIN | Driver logic-level input | Accepts 3.3V or 5V logic; 5V-tolerant when VCC = 3.3V - eliminates need for external level shifters in mixed-voltage systems. |
| 12 - FORCEON | Auto-powerdown override input | High disables auto-powerdown; low enables automatic driver disable when RIN is inactive - key for zero-power idle states. |
| 13 - DOUT | RS-232 driver output | Delivers ±5.4V swing into 3 kΩ load; slew rate limited to 6–30 V/μs - ensures EMI compliance and reduces crosstalk in dense layouts. |
| 14 - GND | Ground reference | Primary return path for VCC, charge-pump, and I/O; exposed thermal pad (pin 15) must be soldered to PCB ground plane for thermal reliability. |
| 15 - VCC | Power supply input | 3V–5.5V main supply; requires 0.1 μF bypass capacitor close to pin to stabilize charge-pump operation and suppress switching noise. |
| 16 - FORCEOFF | Auto-powerdown enable input | Low forces full shutdown (ICC ≤ 10 μA); high enables auto-powerdown logic - provides hardware-controlled deep-sleep mode. |
Key Features
| Feature | Design Value |
|---|---|
| IEC 61000-4-2 ±15kV air-gap ESD protection | Eliminates need for external TVS diodes on RIN/DOUT, reducing BOM count and PCB area in connector-facing designs. |
| Auto-powerdown with 1 μA standby current | Extends battery runtime in handheld devices by disabling driver output when RS-232 cable is unplugged or idle. |
| INVALID output with 30 μs timeout window | Enables deterministic host-side detection of cable insertion/removal or line fault without software polling or timers. |
| VQFN-16 (3 mm × 3 mm) near chip-scale package | Reduces footprint by 82% vs. TSSOP-16, enabling integration into ultra-thin notebooks and compact industrial controllers. |
| Single 3V–5.5V supply with four 0.1 μF capacitors | Simplifies power design by removing requirement for ±12V supplies or large charge-pump capacitors used in legacy RS-232 ICs. |
| 5V-tolerant DIN input at 3.3V VCC | Permits direct connection to 5V microcontrollers or FPGAs without level translators, lowering system complexity and cost. |
Applications
| Industrial PCs | Wired Networking |
|---|---|
Use Scenario: Serial debug port on fanless industrial PC motherboard with exposed DB9 connector subject to field ESD events. IC Role / Device Role / Timing Role: RS-232 line driver/receiver providing bidirectional UART-to-RS232 conversion with integrated ±15kV IEC ESD protection. Use Value: Eliminates external TVS diodes and reduces PCB layer count by using compact VQFN-16 package, improving MTBF in factory-floor deployments. |
Use Scenario: Management console port on Ethernet switch with hot-pluggable serial cable and strict EMC requirements. IC Role / Device Role / Timing Role: Isolates MCU UART from noisy RS-232 cabling while maintaining 250 kbit/s throughput for CLI access. Use Value: Slew-rate-limited DOUT (6–30 V/μs) minimizes radiated emissions, helping pass CISPR 22 Class B without ferrite beads or shielding. |
| Battery-Powered Systems | Notebooks / Laptops |
Use Scenario: RS-232 diagnostic interface in portable medical monitor powered by Li-ion battery with 10-year shelf life target. IC Role / Device Role / Timing Role: Low-power RS-232 transceiver with auto-powerdown and 1 μA standby current to minimize quiescent drain. Use Value: INVALID output triggers MCU wake-from-sleep on cable attach, enabling zero-power idle mode until user interaction occurs. |
Use Scenario: Legacy serial port on ultrabook motherboard where Z-height and thermal dissipation are constrained. IC Role / Device Role / Timing Role: Space-optimized RS-232 interface IC with 3 mm × 3 mm VQFN package and exposed thermal pad for passive cooling. Use Value: 82% smaller footprint than TSSOP enables routing beneath keyboard assembly, preserving thin-profile mechanical stackup. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar RS-232 transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TRS3221EIPW | TSSOP-16 (5 mm × 4.4 mm) package; identical electrical specs and pinout; higher RθJA (110.9°C/W) limits max ambient temperature in sealed enclosures. | Suitable for prototyping or legacy PCBs with TSSOP footprints; not optimal for volume production where board area is premium. | Select TRS3221EIPW only if existing layout lacks space for VQFN rework or thermal pad soldering capability. |
| TRSF3221EIRGTR | Pin-compatible upgrade supporting 1 Mbit/s data rate; same VQFN-16 package and ESD ratings; requires tighter layout for high-speed signal integrity. | Required for applications needing >250 kbit/s (e.g., high-speed modem handshaking or firmware updates over serial). | Choose TRSF3221EIRGTR when future-proofing for higher baud rates; otherwise TRS3221EIRGTR offers lower EMI and proven stability at 250 kbit/s. |
Compared with TRS3221EIPW, TRS3221EIRGTR saves 82% board area and improves thermal resistance by 53% (RθJA 52.1 vs. 110.9°C/W), while TRSF3221EIRGTR trades verified 250 kbit/s robustness for 4× speed headroom - making TRS3221EIRGTR optimal for space- and power-constrained legacy-compliant designs.
Availability
TRS3221EIRGTR is available at Aetrix Electronics and suitable for industrial PCs, battery-powered systems, and notebook designs requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for TRS3221EIRGTR 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 leader specializing in analog, embedded processing, and connectivity technologies with over 50 years of innovation in interface solutions.
The TRS3221EIRGTR belongs to TI's RS-232 transceiver product line, engineered for compact, low-power, ESD-hardened serial communication in portable and industrial equipment where board space and reliability are critical.
FAQ
What is the maximum data rate supported by the TRS3221EIRGTR?
The TRS3221EIRGTR supports a maximum data signaling rate of 250 kbit/s under standard load conditions (CL = 1000 pF, RL = 3 kΩ). This is validated across all package variants including the VQFN-16 (RGT) used in TRS3221EIRGTR, ensuring reliable operation at common UART baud rates like 115.2 kbit/s with noise margin.
Does the TRS3221EIRGTR require external charge-pump capacitors?
Yes, the TRS3221EIRGTR requires four external 0.1 μF ceramic capacitors (C1+, C1−, C2+, C2−) to operate from a single 3V–5.5V supply. These capacitors form the voltage-doubler and inverter stages that generate the ±5.5V rails needed for RS-232-compliant output swing - no external DC-DC converter is needed.
How does the INVALID output function on the TRS3221EIRGTR?
The INVALID output on the TRS3221EIRGTR goes high when the RIN input voltage exceeds ±2.7V or remains within ±0.3V for less than 30 μs - indicating valid RS-232 signal presence. It goes low when RIN stays within ±0.3V for more than 30 μs, signaling invalid or absent signal - enabling host MCU to detect cable plug/unplug events.
Can the TRS3221EIRGTR operate with a 3.3V supply while accepting 5V logic inputs?
Yes, the TRS3221EIRGTR DIN input is 5V-tolerant when VCC = 3.3V, allowing direct connection to 5V microcontrollers or FPGAs without external level-shifting circuitry. This feature is explicitly specified in the datasheet's Recommended Operating Conditions table for TRS3221EIRGTR.
What is the standby current consumption of the TRS3221EIRGTR in auto-powerdown mode?
In auto-powerdown mode (FORCEON = low, FORCEOFF = high, no valid RS-232 signal on RIN), the TRS3221EIRGTR draws ≤10 μA typical supply current. The datasheet specifies 1 μA typical, with 10 μA as the maximum limit across temperature and process variation - critical for battery longevity in always-connected portable devices.
TRS3221EIRGTR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Transceiver
- Protocol:
- RS232
- Number of Drivers/Receivers:
- 1/1
- Duplex:
- Full
- Receiver Hysteresis:
- 500 mV
- Data Rate:
- 500kbps
- Voltage - Supply:
- 3V ~ 3.6V, 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-VQFN (3x3)
TRS3221EIRGTR FAQ
1.How can I place an order for TRS3221EIRGTR through Aetrix?
Please submit a Request for Quotation (RFQ) for TRS3221EIRGTR 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 TRS3221EIRGTR reliable?
The price and inventory of TRS3221EIRGTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TRS3221EIRGTR is usually 5 days.
3.What payment methods are accepted for TRS3221EIRGTR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TRS3221EIRGTR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TRS3221EIRGTR?
TRS3221EIRGTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TRS3221EIRGTR 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 TRS3221EIRGTR?
For technical support, including TRS3221EIRGTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TRS3221EIRGTR requirements.
6.How does Aetrix verify that TRS3221EIRGTR is sourced from the original manufacturer or authorized distributors?
All TRS3221EIRGTR 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 TRS3221EIRGTR meets industry standards.
7.What is the process for return or replacement of TRS3221EIRGTR?
All TRS3221EIRGTR units undergo pre-shipment inspection (PSI). If there is an issue with TRS3221EIRGTR, 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 TRS3221EIRGTR part is unused and in its original packaging.
Return procedure for TRS3221EIRGTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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