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Texas Instruments TPS3305-25DGNR
- Part No.:
- TPS3305-25DGNR
- Manufacturer:
- Texas Instruments
- Category:
- Supervisors
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
TPS3305-25DGNR.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,610
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Product details
Overview
TPS3305-25DGNR from Texas Instruments is a dual-voltage supervisor IC for DSP and processor-based systems, monitoring 3.3V I/O and 2.5V core supplies with fixed 200ms reset delay, watchdog timeout of 1.6s (typ), and operation from 2.7V to 6V supply. It delivers micropower performance (40µA max) and operates across –40°C to +85°C in industrial and portable equipment.
For engineers reviewing the TPS3305-25DGNR datasheet, TPS3305-25DGNR pinout, TPS3305-25DGNR application, or TPS3305-25DGNR equivalent, key selection criteria include dual independent voltage thresholds (2.93V/2.25V), active-low and active-high reset outputs, watchdog timer input (WDI), manual reset (MR), and HVSSOP-8 package compatibility with space-constrained PCB layouts.
Technical Context
The TPS3305-25DGNR implements two independent voltage monitoring channels with temperature-compensated references and hysteresis (30mV typ at 2.93V, 20mV typ at 2.25V), enabling reliable power sequencing in multi-rail systems. Its internal oscillator drives both the power-on reset timer and watchdog timeout logic.
Reset assertion occurs when either SENSE1 or SENSE2 falls below its respective threshold (2.93V or 2.25V), or when WDI remains static for >1.6s. After recovery, RESET remains asserted for the factory-programmed 200ms delay before release.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supervised Voltages | SENSE1 = 3.3V nominal (2.93V threshold), SENSE2 = 2.5V nominal (2.25V threshold) |
| Reset Delay Time | 200ms typical; no external capacitor required - simplifies BOM and layout |
| Watchdog Timeout | 1.6s typical; ensures system-level fault detection without software intervention |
| Supply Current | 40µA maximum; enables battery-backed or ultra-low-power applications |
| Operating Voltage Range | 2.7V to 6V on VDD; supports wide-input industrial and adapter-powered systems |
| Temperature Range | –40°C to +85°C; qualified for industrial and automotive under-hood environments |
| Output Types | Active-low RESET and active-high RESET outputs - provides flexibility for host controller interface logic |
Pinout & Package
HVSSOP-8 (DGN) package: 3mm × 3mm, 0.65mm pitch, 1.1mm max height, exposed thermal pad (PowerPAD™). Pin 1 index area located at top-left corner per JEDEC MO-187.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SENSE1 | Voltage monitor input 1 | Monitors 3.3V I/O rail; asserts RESET if voltage drops below 2.93V (typ) |
| SENSE2 | Voltage monitor input 2 | Monitors 2.5V core rail; asserts RESET if voltage drops below 2.25V (typ) |
| WDI | Watchdog timer input | Toggles to prevent timeout; failure to toggle within 1.6s triggers RESET assertion |
| GND | Ground reference | Common return path for all analog and digital circuitry; connects to exposed thermal pad |
| MR | Manual reset input | Active-low signal; forces RESET assertion regardless of SENSEn or WDI state |
| RESET | Active-low reset output | Drives low during fault condition; sinks up to 5mA; compatible with standard logic inputs |
| RESET | Active-high reset output | Drives high during fault condition; sources up to 3mA; eliminates need for external inverter |
| VDD | Supply voltage input | 2.7V–6V main supply; powers internal reference, timers, and outputs; defined RESET from ≥1.1V |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent voltage supervision | Simultaneous monitoring of 3.3V I/O and 2.5V core rails with separate thresholds and hysteresis |
| Integrated watchdog timer | Hardware-based 1.6s timeout prevents firmware lockup without CPU involvement |
| No external timing components | Factory-programmed 200ms reset delay eliminates capacitor placement, tolerance, and aging concerns |
| Complementary reset outputs | Both active-low and active-high RESET signals reduce external logic and improve noise immunity |
| Micropower operation | 40µA max supply current enables use in always-on, battery-backed subsystems |
Applications
| Processor Power Sequencing | DSP-Based Signal Processing |
|---|---|
Use Scenario: Coordinating startup of 3.3V I/O and 2.5V core supplies in ARM Cortex-A/M series SoCs. IC Role / Device Role / Timing Role: Dual-supply supervisor enforcing correct voltage order and hold time before releasing reset to CPU. Use Value: Prevents latch-up or undefined boot states by ensuring core voltage stabilizes before I/O initialization. | Use Scenario: Monitoring power integrity in TI C6000 DSP-based radar processing units. IC Role / Device Role / Timing Role: Real-time voltage watchdog detecting brownout on analog front-end (AFE) and digital core rails. Use Value: Triggers controlled shutdown before corrupted FFT or filtering results propagate to safety-critical outputs. |
| Industrial PLC Controller | Portable Medical Instrument |
Use Scenario: Ensuring stable operation of 24V-to-3.3V/2.5V DC-DC outputs in programmable logic controllers. IC Role / Device Role / Timing Role: Fault detector asserting reset on undervoltage or watchdog timeout during field-deployed runtime. Use Value: Maintains functional safety compliance (IEC 61508) by guaranteeing deterministic response to power anomalies. | Use Scenario: Supervising dual-rail power in handheld ECG analyzers powered by Li-ion batteries. IC Role / Device Role / Timing Role: Low-quiescent supervisor enabling >100-hour battery life while guarding against deep discharge-induced reset failures. Use Value: Extends operational runtime without sacrificing reliability-40µA IDD allows continuous monitoring during sleep modes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-supply supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3305-25DR | SOIC-8 package (6.4mm × 5.2mm); higher thermal resistance (5.8mW/°C derating); no exposed thermal pad | Better suited for through-hole prototyping or legacy board designs with SOIC footprints | Select when board rework, hand-soldering, or thermal margin above 1.1W is required |
| TPS3808G33DBVR | Single-channel supervisor; 3.3V threshold only; adjustable delay via capacitor; 1.8µA quiescent current | Lacks dual-rail capability and watchdog; optimized for ultra-low-power single-rail microcontrollers | Choose only for cost-sensitive, single-supply applications where dual monitoring is unnecessary |
Compared with TPS3305-25DR, the TPS3305-25DGNR offers 3× smaller footprint and superior thermal performance via PowerPAD™; versus TPS3808G33DBVR, it provides essential dual-rail supervision and hardware watchdog-critical for DSP/processor boot integrity.
Availability
TPS3305-25DGNR is available at Aetrix Electronics and suitable for industrial PLC controllers, portable medical instruments, and DSP-based signal processing systems requiring stable component supply and long-term lifecycle support.
Supply support for TPS3305-25DGNR 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 delivering analog, embedded processing, and connectivity solutions with emphasis on reliability, precision, and energy efficiency.
The TPS3305 family targets DSP- and processor-based systems needing coordinated dual-supply monitoring, hardware watchdog protection, and micropower operation across industrial and portable environments.
FAQ
What is the exact voltage threshold for SENSE2 on the TPS3305-25DGNR?
The SENSE2 input of the TPS3305-25DGNR has a nominal threshold voltage of 2.25V, with a guaranteed range of 2.20V to 2.30V at 0°C to +85°C and 2.20V to 2.32V over the full –40°C to +85°C operating range. This threshold is factory-trimmed and temperature-compensated to ensure stability across environmental conditions without external calibration.
Does the TPS3305-25DGNR require an external capacitor for reset timing?
No, the TPS3305-25DGNR does not require an external capacitor for its 200ms power-on reset delay. The timing is fully integrated and factory-programmed, eliminating component count, layout area, and parametric drift associated with external RC networks. This simplifies design validation and improves long-term reliability.
Can the TPS3305-25DGNR monitor voltages other than 3.3V and 2.5V?
The TPS3305-25DGNR is specifically configured for 3.3V I/O (SENSE1 = 2.93V threshold) and 2.5V core (SENSE2 = 2.25V threshold) supervision. It is not user-adjustable; alternative part numbers like TPS3305-18 or TPS3305-33 must be used for different nominal voltage pairs. No resistor-divider programming or pin-strapping is supported.
What is the function of the exposed thermal pad on the TPS3305-25DGNR HVSSOP package?
The exposed thermal pad on the TPS3305-25DGNR's HVSSOP-8 (DGN) package is electrically connected to GND and serves as the primary thermal conduction path. It must be soldered to a PCB copper pour with thermal vias to achieve rated power dissipation (1.37W at +70°C) and maintain junction temperature within specification under continuous operation.
How does the watchdog timer on the TPS3305-25DGNR interact with the voltage monitoring function?
The watchdog timer in the TPS3305-25DGNR operates independently of the SENSE1/SENSE2 comparators but shares the same RESET assertion logic. A WDI timeout (>1.6s) or voltage fault on either sense input will assert both RESET outputs. Recovery requires both SENSEn voltages to exceed their thresholds *and* a valid WDI toggle before the 200ms delay expires.
TPS3305-25DGNR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 2
- Voltage - Threshold:
- 2.25V, 2.93V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active High/Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-HVSSOP
TPS3305-25DGNR FAQ
1.How can I place an order for TPS3305-25DGNR through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS3305-25DGNR 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 TPS3305-25DGNR reliable?
The price and inventory of TPS3305-25DGNR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS3305-25DGNR is usually 5 days.
3.What payment methods are accepted for TPS3305-25DGNR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS3305-25DGNR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS3305-25DGNR?
TPS3305-25DGNR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS3305-25DGNR 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 TPS3305-25DGNR?
For technical support, including TPS3305-25DGNR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS3305-25DGNR requirements.
6.How does Aetrix verify that TPS3305-25DGNR is sourced from the original manufacturer or authorized distributors?
All TPS3305-25DGNR 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 TPS3305-25DGNR meets industry standards.
7.What is the process for return or replacement of TPS3305-25DGNR?
All TPS3305-25DGNR units undergo pre-shipment inspection (PSI). If there is an issue with TPS3305-25DGNR, 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 TPS3305-25DGNR part is unused and in its original packaging.
Return procedure for TPS3305-25DGNR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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