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Texas Instruments TRSF3221EIRGTR
- Part No.:
- TRSF3221EIRGTR
- Manufacturer:
- Texas Instruments
- Category:
- Drivers, Receivers, Transceivers
- Package:
- 16-VFQFN Exposed Pad
- Datasheet:
-
TRSF3221EIRGTR.pdf
- Description:
- IC TRANSCEIVER FULL 1/1 16VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,374
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Product details
Overview
TRSF3221EIRGTR from Texas Instruments is a single-channel RS-232 transceiver IC with ±15kV IEC 61000-4-2 ESD protection, operating from 3V to 5.5V supply and supporting up to 1 Mbit/s data rates. It integrates one driver, one receiver, dual charge-pump circuitry, and auto-powerdown control - enabling robust serial communication in space-constrained industrial and portable systems.
For engineers reviewing the TRSF3221EIRGTR datasheet, TRSF3221EIRGTR pinout, TRSF3221EIRGTR application, or TRSF3221EIRGTR equivalent, this device delivers verified RS-232 level translation with low standby current (1 μA), logic-level compatibility (5V-tolerant inputs at 3.3V VCC), and INVALID status signaling for real-time receiver input validation.
Technical Context
The TRSF3221EIRGTR implements a dual-stage charge-pump architecture generating ±5.5V rails from a single 3V–5.5V supply, using four 0.1μF external capacitors. Its driver output slew rate ranges from 24 V/μs to 150 V/μs, ensuring controlled edge rates compliant with RS-232 timing requirements across load capacitances up to 1000 pF.
Power management is implemented via FORCEON/FORCEOFF control pins and an EN pin, enabling three operational modes: normal operation, auto-powerdown (driver disabled when no valid RS-232 signal detected), and full shutdown (1 μA ICC). The INVALID output provides TTL-level indication of valid RS-232 input presence based on ±2.7V thresholds and 30 μs indeterminate window detection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 3V to 5.5V - supports direct integration into 3.3V or 5V logic domains without auxiliary supplies. |
| Data Rate | Up to 1 Mbit/s - validated for CL = 250 pF (3–4.5V VCC) and CL = 1000 pF (4.5–5.5V VCC). |
| ESD Protection | ±15kV IEC 61000-4-2 air-gap/contact - protects RIN/DOUT pins against system-level electrostatic discharge events. |
| Standby Current | 1 μA typical - achieved when FORCEOFF = GND and EN = high, enabling ultra-low-power serial port sleep states. |
| INVALID Output Logic | High = valid RS-232 input (> +2.7V or < −2.7V); low = invalid (>30 μs within −0.3V to +0.3V) - enables host MCU to detect cable disconnect or remote transceiver power loss. |
| Driver Slew Rate | 24 V/μs to 150 V/μs - adjustable via VCC and load, limiting EMI while meeting RS-232 rise/fall time compliance. |
| Receiver Input Threshold | VIT+ = 1.6–2.4V, VIT− = 0.6–1.4V (VCC-dependent) - ensures reliable logic-level translation from ±3V to ±25V RS-232 inputs. |
Pinout & Package
TRSF3221EIRGTR is packaged in a 16-pin VQFN (RGT) package measuring 3 mm × 3 mm with exposed thermal pad - 82% smaller than TSSOP and optimized for high-density PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (EN) | Receiver enable input | Low disables ROUT output (high-impedance); required for receiver power gating in low-power modes. |
| 2 (C1+) | Charge-pump capacitor positive terminal | Connects to + lead of first 0.1μF charge-pump capacitor; critical for V+ rail generation. |
| 3 (V+) | Positive charge-pump output | Provides +5.5V rail for driver output stage; not intended for external loading. |
| 4 (C1−) | Charge-pump capacitor negative terminal | Connects to − lead of first 0.1μF capacitor; completes voltage-doubler loop. |
| 5 (C2+) | Second charge-pump capacitor positive terminal | Connects to + lead of second 0.1μF capacitor; supports V− rail generation. |
| 6 (C2−) | Second charge-pump capacitor negative terminal | Connects to − lead of second 0.1μF capacitor; completes inverting charge-pump stage. |
| 7 (V−) | Negative charge-pump output | Provides −5.5V rail for driver output stage; must be decoupled locally. |
| 8 (RIN) | RS-232 receiver input | Accepts ±25V RS-232 signals; includes internal termination and INVALID logic sensing. |
| 9 (ROUT) | Logic-level receiver output | Drives UART or controller with TTL/CMOS-compatible levels; high-impedance when EN = high. |
| 10 (INVALID) | Receiver input validity indicator | Active-high TTL output signaling presence of valid RS-232 voltage on RIN; used for link monitoring. |
| 11 (DIN) | Logic-level driver input | Accepts 3.3V or 5V logic inputs even when VCC = 3.3V - eliminates level-shifter requirement. |
| 12 (FORCEON) | Auto-powerdown enable control | Low + FORCEOFF high activates auto-powerdown; both high disables feature. |
| 13 (DOUT) | RS-232 driver output | Delivers ±5.4V RS-232 compliant outputs; short-circuit protected up to ±90 mA (5.5V VCC). |
| 14 (GND) | Signal ground reference | Common return for all analog/digital functions; thermal pad may be connected to GND for improved thermal performance. |
| 15 (VCC) | Main supply input | 3V–5.5V input powering logic core, charge pump, and interface circuits; requires 0.1μF local bypass. |
| 16 (FORCEOFF) | Auto-powerdown disable control | High + FORCEON low enables auto-powerdown; low + EN high forces full shutdown (1 μA). |
Key Features
| Feature | Design Value |
|---|---|
| IEC 61000-4-2 ESD protection | ±15kV air-gap and ±8kV contact discharge on RIN/DOUT - eliminates need for external TVS diodes in most industrial environments. |
| Single-supply operation | Generates ±5.5V internal rails from 3V–5.5V VCC using only four 0.1μF capacitors - reduces BOM count and board area vs dual-supply solutions. |
| Auto-powerdown with INVALID flag | Automatically disables driver when no valid RS-232 signal is detected on RIN, while INVALID pin reports status to host - enables zero-touch serial port power management. |
| 5V-tolerant logic inputs | DIN, FORCEON, FORCEOFF accept 0–5.5V inputs regardless of VCC (3.3V or 5V) - simplifies interfacing with mixed-voltage systems. |
| VQFN-16 (3mm × 3mm) package | 82% smaller footprint than TSSOP-16 with exposed thermal pad - improves thermal performance and enables compact handheld/portable designs. |
Applications
| Industrial PCs | Wired Networking Equipment |
|---|---|
|
Use Scenario: Serial debug port on fanless industrial PC motherboard requiring ESD-hardened RS-232 connectivity in confined chassis space. IC Role / Device Role / Timing Role: Translates UART logic levels to RS-232 voltage levels while providing ±15kV system-level ESD immunity on the COM port connector. Use Value: Eliminates external ESD protection components and reduces PCB area by 82% vs TSSOP alternatives - critical for DIN-rail mounted controllers with strict thermal envelopes. |
Use Scenario: Management console port on Ethernet switch supporting out-of-band configuration during firmware updates. IC Role / Device Role / Timing Role: Provides isolated RS-232 interface between baseband processor and RJ-45 serial port, with INVALID signaling to detect cable insertion/removal. Use Value: Auto-powerdown cuts idle current to 1 μA, extending uptime in battery-backed management subsystems; 1 Mbit/s capability supports fast firmware upload over serial. |
| Battery-Powered Test Equipment | Enterprise Data Center KVM Systems |
|
Use Scenario: Handheld oscilloscope with USB-to-RS-232 adapter module requiring low quiescent current and robust ESD resilience. IC Role / Device Role / Timing Role: Bridges microcontroller UART to legacy test instrumentation via RS-232, with FORCEOFF-controlled shutdown during sleep mode. Use Value: 1 μA shutdown current extends battery life; 5V-tolerant DIN allows direct connection to 5V USB-UART bridges without level shifters. |
Use Scenario: Keyboard-Video-Mouse (KVM) switch supporting remote server access via dedicated serial management ports. IC Role / Device Role / Timing Role: Enables hot-plug detection and link integrity monitoring through INVALID output, synchronizing KVM port switching with physical cable presence. Use Value: INVALID pin eliminates software polling delays; ±15kV ESD rating prevents field failures in multi-rack data center environments with frequent cable handling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar RS-232 transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TRS3221EIRGTR | Lower maximum data rate (250 kbit/s vs 1 Mbit/s); identical pinout and package; same 3V–5.5V supply range and ±15kV IEC ESD rating. | Targeted at cost-sensitive, lower-speed industrial interfaces where 1 Mbps is unnecessary - e.g., sensor configuration ports or legacy PLC programming links. | Select when guaranteed 250 kbit/s operation suffices and design reuse of TRSF3221EIRGTR layout is desired; no PCB changes required. |
| MAX3221EESA+ | SOIC-16 package (5mm × 4.4mm); same electrical specs but lacks INVALID output; uses different charge-pump capacitor values (0.33μF recommended at 5V). | Suitable for through-hole prototyping or legacy SOIC-based designs; no built-in receiver input status reporting - requires external monitoring circuitry. | Choose for SOIC compatibility or when INVALID functionality is not needed; verify capacitor selection per MAX3221E datasheet. |
Compared with TRS3221EIRGTR and MAX3221EESA+, the TRSF3221EIRGTR uniquely combines 1 Mbit/s capability, INVALID status signaling, and VQFN-16 miniaturization - making it optimal for next-generation portable, industrial, and data center serial interfaces where speed, intelligence, and size are jointly constrained.
Availability
TRSF3221EIRGTR is available at Aetrix Electronics and suitable for industrial PCs, wired networking equipment, and battery-powered test equipment requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for TRSF3221EIRGTR 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 decades of RS-232 interface innovation and automotive-grade reliability validation.
The TRSF3221EIRGTR belongs to TI's precision RS-232 transceiver product line, engineered for high-ESD environments and low-power portable systems - delivering robust serial communication without external voltage converters or protection devices.
FAQ
What is the maximum data rate supported by the TRSF3221EIRGTR?
The TRSF3221EIRGTR supports up to 1 Mbit/s under specified conditions: CL = 250 pF with VCC = 3V–4.5V, or CL = 1000 pF with VCC = 4.5V–5.5V. At 3.3V VCC and 1000 pF load, the maximum validated rate is 250 kbit/s. These limits are defined in the switching characteristics section of the official datasheet (SLLS822C, Section 5.8).
Does the TRSF3221EIRGTR require external charge-pump capacitors?
Yes, the TRSF3221EIRGTR requires four external 0.1μF ceramic capacitors (C1–C4) for charge-pump operation when VCC = 3.3V ± 0.3V. For 5V ± 0.5V operation, TI specifies C1 = 0.047μF and C2–C4 = 0.33μF. These capacitors are mandatory for generating the ±5.5V internal rails that drive RS-232 compliant outputs.
How does the INVALID output function on the TRSF3221EIRGTR?
The INVALID output on the TRSF3221EIRGTR is a TTL-level status pin indicating RS-232 signal presence: it asserts high when RIN voltage exceeds +2.7V or falls below −2.7V, or remains within −0.3V to +0.3V for less than 30 μs. It goes low only if RIN stays in that indeterminate window for >30 μs - enabling reliable cable disconnect detection without host software polling.
Can the TRSF3221EIRGTR operate with a 3.3V supply while accepting 5V logic inputs?
Yes, the TRSF3221EIRGTR accepts 5V-tolerant logic inputs on DIN, FORCEON, and FORCEOFF pins even when VCC = 3.3V. This is explicitly confirmed in the "Features" and "Recommended Operating Conditions" sections of the datasheet (SLLS822C), eliminating the need for external level shifters when interfacing with 5V microcontrollers or USB-UART bridges.
What package type is used for the TRSF3221EIRGTR?
The TRSF3221EIRGTR uses a 16-pin VQFN package (RGT variant) measuring 3 mm × 3 mm with an exposed thermal pad. This package is documented in TI's mechanical drawings and orderable information (Section 11 of SLLS822C), and is distinct from the DB (SSOP), PW (TSSOP), and DYY (SOT-23-THN) variants of the same family.
TRSF3221EIRGTR 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:
- 1Mbps
- 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)
TRSF3221EIRGTR FAQ
1.How can I place an order for TRSF3221EIRGTR through Aetrix?
Please submit a Request for Quotation (RFQ) for TRSF3221EIRGTR 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 TRSF3221EIRGTR reliable?
The price and inventory of TRSF3221EIRGTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TRSF3221EIRGTR is usually 5 days.
3.What payment methods are accepted for TRSF3221EIRGTR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TRSF3221EIRGTR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TRSF3221EIRGTR?
TRSF3221EIRGTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TRSF3221EIRGTR 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 TRSF3221EIRGTR?
For technical support, including TRSF3221EIRGTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TRSF3221EIRGTR requirements.
6.How does Aetrix verify that TRSF3221EIRGTR is sourced from the original manufacturer or authorized distributors?
All TRSF3221EIRGTR 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 TRSF3221EIRGTR meets industry standards.
7.What is the process for return or replacement of TRSF3221EIRGTR?
All TRSF3221EIRGTR units undergo pre-shipment inspection (PSI). If there is an issue with TRSF3221EIRGTR, 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 TRSF3221EIRGTR part is unused and in its original packaging.
Return procedure for TRSF3221EIRGTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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