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Texas Instruments TRS3122ERGER
- Part No.:
- TRS3122ERGER
- Manufacturer:
- Texas Instruments
- Category:
- Drivers, Receivers, Transceivers
- Package:
- 24-VFQFN Exposed Pad
- Datasheet:
-
TRS3122ERGER.pdf
- Description:
- IC TRANSCEIVER 2/2 24VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,675
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Product details
Overview
TRS3122ERGER from Texas Instruments is a dual-channel RS-232 transceiver with integrated tripler/doubler charge pump, supporting 1.8 V, 3.3 V, and 5 V supply operation. It delivers ±4.25 V (min) RS-232 output swing at 1.8 V VCC, maintains 1000-kbps data rate, and features VL pin for logic-level programmability-enabling direct interface with low-voltage MCUs in battery-powered diagnostics and EPOS terminals.
For engineers reviewing the TRS3122ERGER datasheet, TRS3122ERGER pinout, TRS3122ERGER application, or TRS3122ERGER equivalent, this page provides verified specifications, validated pin functions, confirmed mixed-supply operation (VCC/VL), Auto Powerdown Plus timing behavior, and real-world ESD protection ratings per IEC 61000-4-2 Air-Gap and Contact discharge standards.
Technical Context
The TRS3122ERGER implements an auto-sensing charge pump that switches between tripler mode (1.65–2.0 V VCC) and doubler mode (3.0–5.5 V VCC), generating regulated ±2.65×VCC or ±5.4 V outputs respectively using five 0.1-μF capacitors. Its dual drivers and receivers operate with independent VL-referenced logic I/O, eliminating external level shifters.
Auto Powerdown Plus engages after 30 s of inactivity on DIN/RIN pins, reducing supply current to 0.5 μA while keeping receivers active; manual control is enabled via FORCEOFF (active-low disable) and FORCEON (active-low forced-on override). The INVALID pin asserts low when both RIN inputs are open or invalid.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 1.65 V to 2.0 V (tripler mode) or 3.0 V to 5.5 V (doubler mode); enables single-supply operation across legacy and ultra-low-power systems |
| VL Range | 1.65 V to VCC; sets logic threshold for DIN/ROUT, allowing direct connection to 1.8-V/3.3-V microcontrollers without level shifters |
| RS-232 Output Swing | ±4.25 V min at 1.8 V VCC, ±5 V min at 3.3 V/5 V VCC; meets RS-232 compliance under full 3-kΩ load |
| Max Data Rate | 1000 kbps at CL = 500 pF; supports high-speed serial diagnostics and point-of-sale transaction protocols |
| ESD Protection | ±15 kV IEC 61000-4-2 air-gap, ±8 kV contact, ±15 kV HBM on RIN/DOUT pins; ensures robustness in field-deployed equipment |
| Shutdown Current | 0.5 μA typical in Auto Powerdown Plus mode; extends battery life in portable remote radio units and handheld scanners |
| Invalid Detection | INVALID pin goes low when both RIN1/RIN2 are open or within indeterminate range; provides system-level fault signaling |
Pinout & Package
TRS3122ERGER is housed in a 24-pin RGE (VQFN) package measuring 4.00 mm × 4.00 mm with wettable flanks, optimized for automated optical inspection and thermal performance (RθJA = 34.2°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| C1+, C2+ | Charge-pump flying capacitor positive terminals | Required for both tripler and doubler modes; connect to 0.1-μF capacitors |
| C1−, C2− | Charge-pump flying capacitor negative terminals | Required for both tripler and doubler modes; connect to 0.1-μF capacitors |
| C3+, C3− | Tripler-mode flying capacitor terminals | Required only for 1.65–2.0 V VCC operation; leave open for 3.3 V/5 V use |
| V+, V− | Charge-pump storage capacitor terminals | Required; connect to 0.1-μF bypass capacitors for stable ±V outputs |
| VCC | Main power supply input | Accepts 1.65–2.0 V (tripler) or 3.0–5.5 V (doubler); powers internal analog circuitry |
| VL | Logic-level reference supply | Sets DIN input thresholds and ROUT output swing; may be tied to VCC or separate low-voltage rail |
| DIN1, DIN2 | Driver input signals | CMOS-compatible TTL inputs referenced to VL; drive DOUT1/DOUT2 when enabled |
| DOUT1, DOUT2 | RS-232 transmitter outputs | ±4.25 V min swing at 1.8 V VCC; compliant with EIA/TIA-232-F standard |
| RIN1, RIN2 | RS-232 receiver inputs | Accept ±15 V RS-232 signals; protected to ±15 kV IEC 61000-4-2 air-gap |
| ROUT1, ROUT2 | Receiver output signals | CMOS outputs swinging 0 to VL; inverted relative to RIN; disabled when FORCEOFF = low |
| FORCEOFF | Manual receiver/driver disable control | Active-low; forces all drivers/receivers into high-impedance state and reduces Icc to 0.5 μA |
| FORCEON | Auto Powerdown Plus enable/disable control | Active-low; when low + FORCEOFF high, enables 30-s inactivity timeout for automatic shutdown |
| INVALID | Status output indicator | Asserts low when both RIN inputs are open or invalid; used for system fault detection |
| GND | Ground reference | Common return path for VCC, VL, and charge-pump circuitry |
| NC | No-connect factory test pins | Pins 7 and 8; may be left unconnected or tied to GND per layout guidelines |
Key Features
| Feature | Design Value |
|---|---|
| Tripler/Doubler Auto-Sensing Charge Pump | Eliminates need for external voltage converters; supports 1.8 V VCC while delivering RS-232–compliant ±4.25 V outputs |
| VL-Referenced Logic I/O | Enables direct interfacing with 1.8-V/3.3-V UARTs without external level shifters, reducing BOM count and PCB area |
| Auto Powerdown Plus | Reduces supply current to 0.5 μA after 30 s inactivity; exits in ≤150 μs upon signal detection-no firmware intervention required |
| IEC 61000-4-2 ESD Protection | ±15 kV air-gap and ±8 kV contact discharge on RIN/DOUT pins; exceeds industrial immunity requirements for field-deployed gear |
| INVALID Pin Status Monitoring | Provides hardware-level fault indication when RS-232 bus is disconnected or signal integrity degrades beyond valid thresholds |
Applications
| Remote Radio Unit (RRU) | Electronic Point of Sale (EPOS) |
|---|---|
Use Scenario: Serial communication between baseband processor and RF front-end over extended cable runs in outdoor telecom cabinets. IC Role / Device Role / Timing Role: Dual RS-232 transceiver providing robust, ESD-hardened interface between 1.8-V FPGA and legacy RS-232 peripherals. Use Value: Tripler-mode operation at 1.8 V VCC minimizes power draw in thermally constrained enclosures, while ±15 kV ESD rating prevents field failures from lightning-induced surges. |
Use Scenario: Connecting barcode scanner or receipt printer to low-power ARM-based POS terminal via RS-232. IC Role / Device Role / Timing Role: Level-shifting transceiver enabling 1.8-V MCU GPIO to drive full RS-232 voltage swings without discrete translators. Use Value: VL pin allows ROUT outputs to swing 0–1.8 V, matching MCU logic levels directly-reducing component count and improving signal integrity. |
| Base Band Unit (BBU) | Battery-Powered Diagnostics Equipment |
Use Scenario: Backchannel telemetry link between BBU controller and monitoring sensors in 5G infrastructure. IC Role / Device Role / Timing Role: Dual-channel RS-232 interface with Auto Powerdown Plus ensuring <1 μA standby current during idle periods. Use Value: 30-second inactivity timeout and sub-150 μs wake-up time enable energy-efficient polling without sacrificing responsiveness. |
Use Scenario: Portable medical or industrial diagnostic tool requiring RS-232 connectivity and multi-day battery life. IC Role / Device Role / Timing Role: Low-power transceiver managing serial data exchange between 3.3-V SoC and external analyzers. Use Value: Doubler-mode operation at 3.3 V VCC delivers ±5 V RS-232 swing while consuming only 0.7–1.4 mA static current-extending runtime per charge cycle. |
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+ | Requires minimum 3.0 V VCC; no 1.8 V operation; uses standard charge pump (no tripler mode); ±15 kV ESD on bus pins | Not suitable for 1.8 V-only systems; lacks VL pin for logic-level flexibility; higher quiescent current (1 μA vs. 0.5 μA) | Select when existing 3.3 V/5 V design requires drop-in replacement with proven field history and lower cost |
| SP3232EEN-L | Supports 3.0–5.5 V VCC only; no 1.8 V capability; includes auto-shutdown but no INVALID status pin; ±15 kV ESD on bus pins | Cannot replace TRS3122ERGER in mixed-voltage or ultra-low-power applications; missing hardware fault detection | Choose for cost-sensitive industrial interfaces where 1.8 V operation and INVALID monitoring are not required |
Compared with MAX3232ESE+ and SP3232EEN-L, TRS3122ERGER uniquely supports true 1.8 V VCC operation with tripler-mode charge pump, integrates VL-referenced logic I/O for seamless MCU interfacing, and provides dedicated INVALID status signaling-making it the only option for next-generation battery-powered RS-232 nodes demanding lowest power and highest integration.
Availability
TRS3122ERGER is available at Aetrix Electronics and suitable for remote radio unit (RRU), electronic point of sale (EPOS), and battery-powered diagnostics equipment requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for TRS3122ERGER 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 expertise in interface ICs and industrial-grade reliability.
The TRS3122ERGER belongs to TI's RS-232 transceiver product line, engineered specifically for ultra-low-power, mixed-voltage serial communication in space-constrained and battery-operated equipment.
FAQ
What supply voltages does the TRS3122ERGER support?
The TRS3122ERGER supports two distinct VCC operating ranges: 1.65 V to 2.0 V (tripler mode) and 3.0 V to 5.5 V (doubler mode). In tripler mode, it generates ±2.65×VCC outputs; in doubler mode, it delivers ~±5.4 V. The VL pin must be supplied within 1.65 V to VCC and sets logic thresholds for DIN and ROUT. TRS3122ERGER cannot operate at 2.5 V VCC-this voltage falls outside both specified ranges and may cause undefined charge-pump behavior.
How does Auto Powerdown Plus work in the TRS3122ERGER?
Auto Powerdown Plus in the TRS3122ERGER activates automatically after 30 seconds of inactivity on any DIN or RIN pin when FORCEON = low and FORCEOFF = high. It shuts down the charge pump, reducing supply current to 0.5 μA while keeping receivers active. Upon detecting a valid edge, TRS3122ERGER exits powerdown in ≤150 μs. Manual override is possible via FORCEOFF (immediate shutdown) or FORCEON (forced-on mode disabling auto-shutdown).
What is the function of the VL pin on the TRS3122ERGER?
The VL pin on the TRS3122ERGER sets the reference voltage for all CMOS logic I/O: DIN inputs and ROUT outputs. It allows the device to interface directly with 1.8-V, 2.5-V, or 3.3-V microcontrollers without external level shifters. ROUT swings from 0 to VL, and DIN thresholds scale with VL (e.g., VIH ≈ 0.7×VL). VL may be tied to VCC or driven independently-critical for mixed-voltage system designs using TRS3122ERGER.
Does the TRS3122ERGER meet RS-232 electrical specifications?
Yes, the TRS3122ERGER meets or exceeds EIA/TIA-232-F requirements: driver output swing is ±4.25 V min at 1.8 V VCC and ±5 V min at 3.3 V/5 V VCC into 3-kΩ load; receiver input thresholds are ±3 V min with 300-mV hysteresis; and common-mode rejection supports operation with ground offsets up to ±15 V. These parameters are verified across –40°C to +85°C and documented in the TRS3122ERGER datasheet Sections 6.6 and 6.7.
What is the purpose of the INVALID pin on the TRS3122ERGER?
The INVALID pin on the TRS3122ERGER is an open-drain status output that asserts low when both RIN1 and RIN2 inputs are open-circuited or receive indeterminate voltage levels (e.g., floating or noise-dominated signals). It remains high during valid RS-232 activity. This pin enables system-level fault detection-allowing host controllers to identify disconnected cables or failed peripherals without polling registers. TRS3122ERGER's INVALID functionality is hardware-based and operates independently of Auto Powerdown Plus.
TRS3122ERGER Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 24-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Transceiver
- Protocol:
- RS232
- Number of Drivers/Receivers:
- 2/2
- Duplex:
- -
- Receiver Hysteresis:
- 450 mV
- Data Rate:
- 1Mbps
- Voltage - Supply:
- 1.65V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-VQFN (4x4)
TRS3122ERGER FAQ
1.How can I place an order for TRS3122ERGER through Aetrix?
Please submit a Request for Quotation (RFQ) for TRS3122ERGER 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 TRS3122ERGER reliable?
The price and inventory of TRS3122ERGER are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TRS3122ERGER is usually 5 days.
3.What payment methods are accepted for TRS3122ERGER?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TRS3122ERGER transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TRS3122ERGER?
TRS3122ERGER orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TRS3122ERGER 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 TRS3122ERGER?
For technical support, including TRS3122ERGER datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TRS3122ERGER requirements.
6.How does Aetrix verify that TRS3122ERGER is sourced from the original manufacturer or authorized distributors?
All TRS3122ERGER 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 TRS3122ERGER meets industry standards.
7.What is the process for return or replacement of TRS3122ERGER?
All TRS3122ERGER units undergo pre-shipment inspection (PSI). If there is an issue with TRS3122ERGER, 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 TRS3122ERGER part is unused and in its original packaging.
Return procedure for TRS3122ERGER:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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