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Texas Instruments TPS3305-25DR
- Part No.:
- TPS3305-25DR
- Manufacturer:
- Texas Instruments
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
TPS3305-25DR.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,338
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Product details
Overview
TPS3305-25DR from Texas Instruments is a dual-voltage supervisor IC designed for DSP- and processor-based systems requiring independent monitoring of core (2.5 V) and I/O (3.3 V) rails. It provides power-on reset with 200 ms fixed delay, watchdog timer timeout of 1.6 s (typ), active-low and active-high RESET outputs, and operates from 2.7 V to 6 V supply with only 40 µA quiescent current. Used in industrial equipment and portable battery-powered devices for reliable system initialization.
For engineers reviewing the TPS3305-25DR datasheet, TPS3305-25DR pinout, TPS3305-25DR application, or TPS3305-25DR equivalent, key selection criteria include dual-threshold supervision (2.93 V / 2.25 V), watchdog input timing, MR assertion behavior, RESET output drive capability (5 mA sink), and SOIC-8 package compatibility with legacy board layouts.
Technical Context
The TPS3305-25DR implements two independent voltage sense comparators with temperature-compensated 1.25 V reference, each feeding into logic that controls dual RESET outputs. Its watchdog circuit monitors WDI toggling with 1.6 s timeout and asserts RESET if no transition occurs - independent of SENSEn states.
Reset assertion occurs when either SENSE1 falls below 2.93 V (typ) or SENSE2 falls below 2.25 V (typ), with 30 mV hysteresis on SENSE1 and 20 mV on SENSE2. After both inputs recover above threshold, a factory-programmed 200 ms (typ) delay holds RESET low before release.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supervised voltages | SENSE1 = 3.3 V nominal (VIT+ = 2.93 V typ); SENSE2 = 2.5 V nominal (VIT+ = 2.25 V typ) |
| Reset delay time | 200 ms typical - ensures stable power-up before releasing processor from reset without external capacitor |
| Watchdog timeout | 1.6 s typical - detects firmware hang by requiring WDI toggle within this window |
| Supply current | 40 µA max - enables use in always-on battery-backed systems with minimal drain |
| Operating voltage range | 2.7 V to 6 V - supports wide-input industrial and automotive power rails |
| Temperature range | –40°C to +85°C - qualified for industrial and extended-temperature embedded applications |
| RESET output drive | 5 mA sink capability at VOL ≤ 0.4 V - directly drives standard CMOS reset inputs without pull-up resistor |
Pinout & Package
TPS3305-25DR is housed in an 8-pin SOIC (D) package, 3.9 mm × 4.9 mm, 1.75 mm max height, RoHS-compliant with NiPdAu lead finish and MSL Level-1 rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SENSE1 (Pin 1) | Voltage monitor input 1 | Monitors 3.3 V I/O rail; asserts RESET if voltage drops below 2.93 V (typ) |
| SENSE2 (Pin 2) | Voltage monitor input 2 | Monitors 2.5 V core rail; asserts RESET if voltage drops below 2.25 V (typ) |
| WDI (Pin 3) | Watchdog timer input | Requires ≥1.6 s toggle interval; failure triggers immediate RESET assertion |
| GND (Pin 4) | Ground reference | Common return path for all internal circuits and RESET outputs |
| RESET (Pin 5) | Active-low reset output | Open-drain output pulled low during reset; requires external pull-up for logic-high state |
| RESET (Pin 6) | Active-high reset output | Push-pull output driven high during reset; no external pull-up needed |
| MR (Pin 7) | Manual reset input | Active-low input; asserting MR forces RESET regardless of SENSEn or WDI status |
| VDD (Pin 8) | Supply voltage input | Power source for internal circuitry; RESET defined down to VDD ≥ 1.1 V |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent voltage supervision | Simultaneously monitors 3.3 V I/O and 2.5 V core rails with separate thresholds and hysteresis |
| Fixed 200 ms power-on reset delay | Eliminates need for external timing capacitor - reduces BOM count and layout area |
| Watchdog timer with 1.6 s timeout | Hardware-level firmware hang detection independent of supply monitoring path |
| Dual RESET outputs (active-low + active-high) | Supports both open-drain and push-pull reset signaling requirements across diverse host processors |
| 40 µA supply current | Enables integration into ultra-low-power systems such as battery-backed real-time clocks or sensor nodes |
| –40°C to +85°C operating range | Validated for industrial control, automotive body electronics, and outdoor communications equipment |
Applications
| Industrial PLC Controller | Portable Medical Monitor |
|---|---|
Use Scenario: Monitors dual 3.3 V I/O and 2.5 V FPGA core supplies during cold start and brownout events. IC Role / Device Role / Timing Role: Dual-rail supervisor ensuring deterministic reset sequencing before FPGA configuration and peripheral initialization. Use Value: Prevents partial configuration or metastability by holding reset until both rails stabilize above 2.93 V and 2.25 V respectively for 200 ms. |
Use Scenario: Supervises battery-backed microcontroller (3.3 V) and analog front-end (2.5 V) in handheld ECG device. IC Role / Device Role / Timing Role: Provides fail-safe reset generation and watchdog supervision to maintain data integrity during low-battery operation. Use Value: 40 µA quiescent current extends battery life; 1.6 s watchdog timeout catches firmware lockups without increasing power budget. |
| Automotive Infotainment Head Unit | Notebook Embedded Controller (EC) |
Use Scenario: Validates 3.3 V communication bus and 2.5 V SoC core supply after ignition power-up in harsh thermal environments. IC Role / Device Role / Timing Role: Industrial-grade dual supervisor handling voltage transients and thermal drift across –40°C to +85°C. Use Value: Temperature-compensated thresholds maintain ±1.5% accuracy over full range; SOIC-8 footprint simplifies replacement in existing designs. |
Use Scenario: Ensures reliable boot of embedded controller managing keyboard, touchpad, and thermal management in laptops. IC Role / Device Role / Timing Role: Generates synchronized reset for EC and companion PMIC using dual RESET outputs. Use Value: Active-low and active-high RESET outputs eliminate level-shifting components; MR pin enables system-level hard reset via keyboard controller. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-supply supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3305-25DGN | HVSSOP-8 (2.3 mm × 2.0 mm) vs SOIC-8 (4.9 mm × 3.9 mm); identical electrical specs and pinout | Required for space-constrained PCBs where 55% smaller footprint is critical | Select TPS3305-25DGN when board area is limited and thermal pad soldering is supported |
| MAX6816EUT+T | Single 3.3 V supervisor with manual reset only; no dual-rail or watchdog functionality | Suitable only for single-rail systems lacking watchdog or core/I/O separation | Choose only if design uses only one monitored rail and does not require firmware hang detection |
Compared with TPS3305-25DGN, the TPS3305-25DR offers identical supervision performance in a larger, through-hole-compatible SOIC package ideal for prototyping and legacy layouts; compared with MAX6816EUT+T, it adds essential dual-rail monitoring and watchdog capability required for modern DSP/processor systems.
Availability
TPS3305-25DR is available at Aetrix Electronics and suitable for industrial PLC controllers, portable medical monitors, automotive infotainment head units, and notebook embedded controller designs requiring stable component supply and long-term production continuity.
Supply support for TPS3305-25DR 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 and embedded processing solutions, with over 50 years of innovation in power management, signal chain, and microcontrollers.
The TPS3305 family was engineered specifically for dual-rail DSP and processor systems needing simultaneous core/I/O voltage supervision, integrated watchdog, and minimal quiescent current - targeting industrial, automotive, and portable computing applications.
FAQ
What is the exact voltage threshold for SENSE2 on the TPS3305-25DR?
The TPS3305-25DR has a nominal SENSE2 threshold of 2.25 V (typical), with guaranteed range of 2.20 V to 2.30 V at 0°C to +85°C and 2.20 V to 2.32 V over full –40°C to +85°C operating range. This threshold supervises a 2.5 V core rail and includes 20 mV hysteresis to prevent chatter during slow voltage recovery.
Does the TPS3305-25DR require an external capacitor for its power-on reset delay?
No, the TPS3305-25DR integrates a factory-programmed 200 ms (typical) power-on reset delay and requires no external capacitor. This eliminates timing component variation, reduces bill-of-materials cost, and improves reliability by removing a potential failure point in the reset circuit.
Can the TPS3305-25DR supervise voltages other than 3.3 V and 2.5 V?
The TPS3305-25DR is factory-configured for 3.3 V (SENSE1) and 2.5 V (SENSE2) nominal rails, with fixed thresholds of 2.93 V and 2.25 V respectively. It cannot be reconfigured for other voltages; alternative part numbers like TPS3305-18 or TPS3305-33 must be used for different rail combinations.
What is the maximum sink current capability of the active-low RESET output on the TPS3305-25DR?
The active-low RESET output (Pin 5) of the TPS3305-25DR can sink up to 5 mA while maintaining VOL ≤ 0.4 V at VDD = 6 V and IOL = 3 mA. This allows direct interface with standard CMOS inputs without external pull-up resistors in most cases.
How does the watchdog timer function on the TPS3305-25DR respond to missing WDI transitions?
If the WDI input remains static for longer than 1.6 s (typical), the TPS3305-25DR immediately asserts both RESET outputs regardless of SENSE1/SENSE2 status or MR state. The watchdog timeout is independent of voltage monitoring and resets only upon next valid WDI edge or MR deassertion after timeout.
TPS3305-25DR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- 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-SOIC
TPS3305-25DR FAQ
1.How can I place an order for TPS3305-25DR through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS3305-25DR 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 TPS3305-25DR reliable?
The price and inventory of TPS3305-25DR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS3305-25DR is usually 5 days.
3.What payment methods are accepted for TPS3305-25DR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS3305-25DR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS3305-25DR?
TPS3305-25DR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS3305-25DR 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 TPS3305-25DR?
For technical support, including TPS3305-25DR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS3305-25DR requirements.
6.How does Aetrix verify that TPS3305-25DR is sourced from the original manufacturer or authorized distributors?
All TPS3305-25DR 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 TPS3305-25DR meets industry standards.
7.What is the process for return or replacement of TPS3305-25DR?
All TPS3305-25DR units undergo pre-shipment inspection (PSI). If there is an issue with TPS3305-25DR, 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 TPS3305-25DR part is unused and in its original packaging.
Return procedure for TPS3305-25DR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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