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Texas Instruments TRS3221CPWRG4
- Part No.:
- TRS3221CPWRG4
- Manufacturer:
- Texas Instruments
- Category:
- Drivers, Receivers, Transceivers
- Package:
- 16-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
TRS3221CPWRG4.pdf
- Description:
- IC TRANSCEIVER FULL 1/1 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,229
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Product details
Overview
TRS3221CPWRG4 from Texas Instruments is a single-driver, single-receiver RS-232 transceiver IC with ±15-kV HBM ESD protection on RS-232 pins, 3-V to 5.5-V operation, automatic power-down capability (1-μA standby current), and integrated charge-pump circuit requiring only four 0.1-μF capacitors. It supports data rates up to 250 kbps and interfaces UART logic to RS-232 physical layer in portable industrial and embedded serial links.
For engineers reviewing the TRS3221CPWRG4 datasheet, TRS3221CPWRG4 pinout, TRS3221CPWRG4 application, or TRS3221CPWRG4 equivalent, key selection criteria include its dual-voltage compatibility (3.3 V/5 V), INVALID status output for receiver signal validity monitoring, FORCEON/FORCEOFF-controlled auto-power-down, and TSSOP-16 package suitability for space-constrained PCB layouts.
Technical Context
The TRS3221CPWRG4 implements a voltage-doubler charge-pump architecture generating ±5.5-V rails (V+, V−) from a single 3.3-V or 5-V supply, enabling compliant RS-232 driver output swing (±5.4 V). Its receiver features hysteresis (0.5 V) and input thresholds of ±2.7 V for valid signal detection, with an INVALID output asserting low when RIN remains within ±0.3 V for >30 μs.
Power management is implemented via dedicated FORCEON and FORCEOFF inputs: when FORCEON = low and FORCEOFF = high, automatic power-down activates if no valid RS-232 signal is detected at RIN, disabling DOUT and reducing ICC to 1 μA typical. EN independently controls ROUT high-impedance state.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 3.0 V to 5.5 V - supports direct interface with both 3.3-V and 5-V logic systems without level shifters |
| Data Rate | Up to 250 kbps - meets full-speed RS-232 requirements for industrial telemetry and point-of-sale terminals |
| ESD Protection | ±15 kV HBM on RS-232 pins (RIN, DOUT) - eliminates need for external TVS diodes in connector-facing designs |
| Standby Current | 1 μA typical - enables multi-year battery life in handheld devices during serial port idle periods |
| Slew Rate | 4–30 V/μs - programmable edge control reduces EMI in noise-sensitive environments |
| INVALID Propagation Delay | tvalid = 1 μs, tinvalid = 30 μs - provides deterministic timing for host MCU firmware to detect cable disconnect or line fault |
| Receiver Input Threshold | VIT+ = +2.7 V, VIT− = −2.7 V - ensures robust detection of true RS-232 voltage levels despite noise or cable loss |
Pinout & Package
TSSOP-16 package (5.00 mm × 4.40 mm body size), 0.65-mm pitch, surface-mount, RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN | Receiver enable input | Low enables ROUT; high forces ROUT into high-impedance - allows software-controlled receiver shutdown |
| FORCEON / FORCEOFF | Auto-power-down control inputs | Force driver active (FORCEON=H, FORCEOFF=H) or enable auto-shutdown (FORCEON=L, FORCEOFF=H) - no external logic required for sleep/wake |
| DIN / DOUT | Logic-level input / RS-232 output | Accepts 3.3-V or 5-V CMOS/TTL logic; drives ±5.4-V RS-232 signals - eliminates external level translation |
| RIN / ROUT | RS-232 input / logic-level output | Receives ±25-V RS-232 signals; outputs 0.4-V/2.7-V logic compatible with 3.3-V or 5-V MCUs |
| INVALID | Status output | Asserts low when RIN is invalid (>30 μs in ±0.3 V window) - enables real-time cable presence and line integrity monitoring |
| C1+/C1−/C2+/C2− | Charge-pump capacitor terminals | Interface external 0.1-μF ceramic caps to generate ±5.5-V internal rails - no inductor or transformer needed |
| VCC / GND | Power supply | Single 3.3-V or 5-V rail powers entire device including charge pump - simplifies power architecture |
Key Features
| Feature | Design Value |
|---|---|
| Integrated charge-pump | Generates ±5.5-V rails from 3.3-V/5-V supply using only four 0.1-μF capacitors - eliminates discrete DC/DC converter |
| Automatic power-down | Reduces ICC to 1 μA when no valid RS-232 signal present at RIN - extends battery life without MCU intervention |
| INVALID status output | Real-time indication of RS-232 signal validity with 1-μs assertion and 30-μs timeout - enables fail-safe UART initialization |
| ±15-kV HBM ESD protection | Full protection on RIN and DOUT pins per JEDEC JS-001 - removes need for external ESD components in final design |
| Logic-level compatibility | Accepts 5-V inputs with 3.3-V VCC - supports mixed-voltage system integration without level shifters |
Applications
| Industrial Handheld Terminals | Medical Point-of-Care Devices |
|---|---|
Use Scenario: Battery-powered barcode scanners and asset trackers requiring reliable RS-232 communication over long cables in noisy factory environments. IC Role / Device Role / Timing Role: TRS3221CPWRG4 acts as the sole RS-232 physical layer interface between the MCU's UART and the DB9 connector, managing voltage translation, ESD protection, and power gating. Use Value: The 1-μA auto-power-down current and ±15-kV ESD rating directly extend battery runtime and eliminate field failures due to connector ESD events. | Use Scenario: Portable ECG monitors and infusion pumps that must maintain FDA-compliant serial diagnostics while operating on coin-cell batteries. IC Role / Device Role / Timing Role: TRS3221CPWRG4 provides isolated RS-232 signaling with INVALID output used by the host MCU to verify cable attachment before initiating diagnostic uploads. Use Value: The 30-μs INVALID timeout and 1-μA standby current ensure rapid cable detection and multi-year shelf life without compromising regulatory compliance. |
| Smart Energy Meters | Embedded Test Equipment |
Use Scenario: Utility-grade electricity meters needing secure, long-life RS-232 ports for field technician configuration and firmware updates. IC Role / Device Role / Timing Role: TRS3221CPWRG4 serves as the hardened serial interface, with FORCEON/FORCEOFF pins tied to MCU GPIOs to enforce strict power sequencing during meter sleep cycles. Use Value: The ±25-V receiver input range and ±15-kV ESD withstand allow direct connection to external test jigs without additional protection circuitry. | Use Scenario: Benchtop oscilloscopes and logic analyzers requiring low-jitter, high-integrity RS-232 control links to PC hosts. IC Role / Device Role / Timing Role: TRS3221CPWRG4 functions as the bidirectional UART-to-RS232 bridge, where its 250-kbps data rate and 150-ns propagation delay ensure command-response timing predictability. Use Value: The 4–30 V/μs slew rate control minimizes radiated emissions during high-speed command bursts, aiding EMC certification. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar RS-232 transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX3221EUP+T | Higher ESD rating (±15 kV IEC 61000-4-2 vs. ±15 kV HBM only); requires five external capacitors | Preferred for medical or automotive applications requiring system-level ESD certification beyond component-level HBM | Select MAX3221EUP+T when IEC 61000-4-2 compliance is mandatory and board area permits fifth capacitor |
| SP3221EEY-L | Lower quiescent current (0.5 μA vs. 1 μA); identical pinout and 0.1-μF capacitor count | Better suited for ultra-low-power IoT sensors where every nanoamp affects battery lifetime | Choose SP3221EEY-L when sub-1-μA standby is critical and TI's 1-μA spec margin is insufficient |
Compared with MAX3221EUP+T and SP3221EEY-L, the TRS3221CPWRG4 offers optimal balance of cost, footprint (TSSOP-16), and proven reliability in industrial handhelds - its 1-μA auto-power-down and INVALID output provide unique value for firmware-driven power management without adding BOM cost.
Availability
TRS3221CPWRG4 is available at Aetrix Electronics and suitable for industrial handheld terminals, medical point-of-care devices, smart energy meters, embedded test equipment, and portable instrumentation requiring stable component supply across extended product lifecycles.
Supply support for TRS3221CPWRG4 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 delivering analog and embedded processing solutions, with leadership in interface, power management, and signal chain technologies.
The TRS3221CPWRG4 belongs to TI's RS-232 transceiver product line, designed specifically for low-power, high-ESD industrial and portable applications where small footprint, single-supply operation, and intelligent power gating are essential.
FAQ
What supply voltage range does the TRS3221CPWRG4 support?
The TRS3221CPWRG4 operates from 3.0 V to 5.5 V, enabling direct use with both 3.3-V and 5-V logic systems. At 3.3-V supply, it delivers ±5.4-V RS-232 output swing using its internal charge pump; at 5-V supply, it maintains full compliance with TIA/EIA-232-F voltage thresholds. This dual-voltage flexibility eliminates external level shifters in mixed-rail designs.
How does the automatic power-down feature work in the TRS3221CPWRG4?
The TRS3221CPWRG4 enters automatic power-down mode when FORCEON = low and FORCEOFF = high, and no valid RS-232 signal (|RIN| > 2.7 V) is detected for >30 μs. In this state, the driver output DOUT is disabled and supply current drops to 1 μA typical. Valid signal reappearance re-enables the driver within 100 μs (ten), making TRS3221CPWRG4 ideal for battery-powered wake-on-ring applications.
What is the function of the INVALID output pin on the TRS3221CPWRG4?
The INVALID pin on the TRS3221CPWRG4 asserts low when the RIN input remains within ±0.3 V for more than 30 μs - indicating loss of valid RS-232 signal (e.g., cable disconnect or driver shutdown). It asserts high when |RIN| exceeds ±2.7 V. This pin operates independently of FORCEON/FORCEOFF states and provides deterministic timing (tvalid = 1 μs, tinvalid = 30 μs) for host MCU firmware to manage UART initialization and fault recovery.
Which external capacitors are required for the TRS3221CPWRG4 charge-pump circuit?
The TRS3221CPWRG4 requires four 0.1-μF ceramic capacitors: C1+ and C1− connect to the voltage-doubler stage; C2+ and C2− connect to the inverter stage. For 3.3-V operation, all four are 0.1 μF; for 5-V operation, C1 is 0.047 μF and C2–C4 are 0.33 μF. These values are specified in Table 4 of the datasheet and ensure stable ±5.5-V rail generation across temperature and load.
Is the TRS3221CPWRG4 pin-compatible with other RS-232 transceivers?
The TRS3221CPWRG4 uses a standard TSSOP-16 footprint but is not pin-compatible with MAX3221 or SP3221 families due to differing pin assignments for FORCEON, FORCEOFF, and INVALID. Its pinout is unique to the TRS32xx series; migration requires PCB layout revision. However, its functional block (1 driver + 1 receiver + status + power control) and 0.1-μF capacitor count align closely with industry-standard low-power RS-232 transceivers.
TRS3221CPWRG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Transceiver
- Protocol:
- RS232
- Number of Drivers/Receivers:
- 1/1
- Duplex:
- Full
- Receiver Hysteresis:
- 500 mV
- Data Rate:
- 250kbps
- Voltage - Supply:
- 3V ~ 5.5V
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-TSSOP
TRS3221CPWRG4 FAQ
1.How can I place an order for TRS3221CPWRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for TRS3221CPWRG4 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 TRS3221CPWRG4 reliable?
The price and inventory of TRS3221CPWRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TRS3221CPWRG4 is usually 5 days.
3.What payment methods are accepted for TRS3221CPWRG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TRS3221CPWRG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TRS3221CPWRG4?
TRS3221CPWRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TRS3221CPWRG4 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 TRS3221CPWRG4?
For technical support, including TRS3221CPWRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TRS3221CPWRG4 requirements.
6.How does Aetrix verify that TRS3221CPWRG4 is sourced from the original manufacturer or authorized distributors?
All TRS3221CPWRG4 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 TRS3221CPWRG4 meets industry standards.
7.What is the process for return or replacement of TRS3221CPWRG4?
All TRS3221CPWRG4 units undergo pre-shipment inspection (PSI). If there is an issue with TRS3221CPWRG4, 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 TRS3221CPWRG4 part is unused and in its original packaging.
Return procedure for TRS3221CPWRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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