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Texas Instruments TPS3305-25D
- Part No.:
- TPS3305-25D
- Manufacturer:
- Texas Instruments
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
TPS3305-25D.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,457
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Product details
Overview
TPS3305-25D 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 independent 2.93V and 2.25V thresholds, 200ms power-on reset delay, and integrated watchdog timer with 1.6s timeout. It operates from 2.7V to 6V supply and supports industrial temperature range (–40°C to +85°C) in SOIC-8 package.
For engineers reviewing the TPS3305-25D datasheet, TPS3305-25D pinout, TPS3305-25D application, or TPS3305-25D equivalent, key selection criteria include dual-supply threshold accuracy, watchdog timing stability, reset assertion behavior under undervoltage or WDI stall, and compatibility with 3.3V/2.5V rail sequencing in embedded control and communications hardware.
Technical Context
The TPS3305-25D implements two independent voltage sense comparators with temperature-compensated 1.25V reference, hysteresis (20mV at 2.25V threshold), and dedicated SENSE1/SENSE2 inputs. Its reset logic asserts active-low RESET when either input falls below VIT–, and holds it low for 200ms after both return above VIT+.
Watchdog functionality triggers RESET if WDI remains static >1.6s (typ), with MR pin enabling manual reset override. The device uses internal oscillator and transition detection circuitry-no external capacitor required-and guarantees defined RESET output down to VDD ≥1.1V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supervised voltages | 3.3V I/O rail (SENSE1), 2.5V core rail (SENSE2) |
| Voltage thresholds (TYP) | SENSE1 = 2.93V, SENSE2 = 2.25V - enables precise rail monitoring without external resistive dividers |
| Reset delay time | 200ms (factory-programmed) - ensures reliable system initialization after power stabilization |
| Watchdog timeout | 1.6s (typ) - detects firmware lockup or stalled execution in real-time processors |
| Supply current | 40µA (max) - supports battery-backed or low-power always-on supervision |
| Operating voltage range | 2.7V to 6V - accommodates wide-input DC-DC outputs and legacy 5V systems |
| Temperature range | –40°C to +85°C - qualified for industrial and automotive under-hood environments |
Pinout & Package
TPS3305-25D is housed in an 8-pin SOIC (D) package (3.9mm × 4.9mm, 1.75mm max height), RoHS-compliant with NiPdAu lead finish and MSL Level-1 rating. Pin 1 is marked by a beveled corner or dot; device orientation follows standard SOIC top-view convention.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SENSE1 | Voltage monitor input 1 | Connects directly to 3.3V I/O supply; asserts reset if voltage drops below 2.93V (typ) |
| SENSE2 | Voltage monitor input 2 | Connects directly to 2.5V core supply; asserts reset if voltage drops below 2.25V (typ) |
| WDI | Watchdog timer input | Toggled by host processor; failure to toggle within 1.6s triggers reset |
| GND | Ground reference | Common return path for all internal circuits and reset outputs |
| VDD | Supply input | Power source (2.7–6V); powers internal reference, comparators, and logic |
| MR | Manual reset input | Active-low signal; forces reset regardless of SENSEn or WDI state |
| RESET | Active-low reset output | Open-drain output; requires external pull-up; drives microcontroller /RESET pin |
| RESET | Active-high reset output | Push-pull output; provides direct logic-level reset signal to FPGA or ASIC |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent voltage supervision | Simultaneous monitoring of 3.3V and 2.5V rails with dedicated thresholds eliminates need for external resistor networks |
| No external capacitor required | Factory-programmed 200ms reset delay removes timing capacitor and associated board space, tolerance, and aging concerns |
| Watchdog timer with 1.6s timeout | Hardware-enforced recovery from software hangs without CPU intervention or additional ICs |
| Guaranteed RESET operation down to VDD ≥1.1V | Ensures fail-safe reset assertion even during brownout conditions before full power-up |
| Low quiescent current (40µA) | Enables use in energy-sensitive applications such as portable instrumentation and remote sensors |
Applications
| Industrial PLC Controller | Automotive Infotainment Head Unit |
|---|---|
|
Use Scenario: Monitors 3.3V I/O and 2.5V DSP core supplies during cold cranking and load dump events. IC Role / Device Role / Timing Role: Dual-rail supervisor ensuring synchronized reset of ARM Cortex-A8 and TI C674x DSP upon valid voltage restoration. Use Value: Prevents partial initialization and memory corruption by holding both processors in reset until both rails exceed 2.93V and 2.25V respectively for 200ms. |
Use Scenario: Supervises power rails in head unit mainboard where 3.3V MCU and 2.5V audio codec must boot coherently. IC Role / Device Role / Timing Role: Provides active-high and active-low reset outputs to interface natively with both MCU and codec reset inputs. Use Value: Eliminates need for discrete level-shifting or dual-reset ICs, reducing BOM count and layout complexity. |
| Wireless Baseband Modem | Notebook Platform Power Sequencing |
|
Use Scenario: Detects firmware hang in LTE baseband processor via WDI toggling; triggers hard reset on communication failure. IC Role / Device Role / Timing Role: Watchdog supervisor with 1.6s timeout guarding against protocol stack deadlock or RF subsystem lockup. Use Value: Recovers modem without host CPU involvement, maintaining cellular link availability during extended field operation. |
Use Scenario: Ensures correct power-up order of Intel PCH (3.3V) and DDR3 memory controller (2.5V) in ultrabook designs. IC Role / Device Role / Timing Role: Dual-threshold supervisor enforcing minimum 200ms hold time after both rails stabilize. Use Value: Meets Intel IMVP-7 specification requirements for rail sequencing margin and reset deassertion timing. |
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 package (3mm × 3mm, 1.1mm height); identical electrical specs and pinout mapping | Better thermal performance and smaller footprint; requires different PCB land pattern and stencil design | Select for space-constrained or thermally demanding layouts where SOIC-8 is impractical |
| MAX6816EPA+ | Single-supply supervisor (3.3V only); no dual-rail capability; includes ESD-hardened inputs and higher reset threshold accuracy (±0.5%) | Lacks 2.5V core monitoring and watchdog timer; suitable only for single-rail systems requiring enhanced noise immunity | Choose only when supervising one rail and ESD robustness (>8kV HBM) is critical; not a functional substitute for TPS3305-25D |
Compared with TPS3305-25DGN, the TPS3305-25D offers identical supervision functionality in a larger, more manufacturable SOIC package ideal for prototyping and medium-volume production; versus MAX6816EPA+, it delivers essential dual-rail and watchdog features required for modern DSP platforms but with lower threshold precision.
Availability
TPS3305-25D is available at Aetrix Electronics and suitable for industrial PLC controllers, automotive infotainment systems, and wireless baseband modems requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for TPS3305-25D 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 power management technologies, with over 50 years of innovation in high-reliability industrial and automotive ICs.
The TPS3305 family was designed specifically for dual-rail power sequencing and watchdog protection in DSP- and processor-based systems, addressing the need for compact, low-power, and capacitor-free supervision in space- and energy-constrained applications.
FAQ
What is the exact voltage threshold for SENSE2 on the TPS3305-25D?
The TPS3305-25D has a nominal SENSE2 threshold of 2.25V at room temperature, with a specified range of 2.20V to 2.30V over 0°C to +85°C and 2.20V to 2.32V across the full –40°C to +85°C operating range. This threshold is factory-trimmed and does not require external calibration. The TPS3305-25D uses this fixed value to supervise 2.5V core supplies in DSP and microprocessor applications.
Does the TPS3305-25D require an external capacitor for its reset delay function?
No, the TPS3305-25D does not require an external capacitor for its power-on reset delay. The 200ms delay is factory-programmed and implemented using internal timing circuitry. This eliminates component count, board area, and timing variation due to capacitor tolerance or temperature drift. The TPS3305-25D achieves this while maintaining ±30% delay accuracy over temperature and supply voltage.
Can the TPS3305-25D supervise a 5V supply?
No, the TPS3305-25D is specifically configured for 3.3V and 2.5V rails, with fixed SENSE1 and SENSE2 thresholds of 2.93V and 2.25V respectively. For 5V supervision, TI recommends the TPS3305-33 variant, which has SENSE1 = 4.55V and SENSE2 = 2.93V. Using the TPS3305-25D on a 5V rail would result in continuous reset assertion since 5V exceeds both thresholds by >2V.
What is the watchdog timeout period for the TPS3305-25D?
The watchdog timeout for the TPS3305-25D is 1.6 seconds typical, with a specified range of 1.1s to 2.3s over temperature and supply voltage. The timer resets on each rising or falling edge of the WDI signal; if no transition occurs within this window, the device asserts RESET. This behavior is fully integrated - no external components or configuration are needed. The TPS3305-25D relies on this feature to recover from firmware stalls in real-time systems.
Is the TPS3305-25D pin-compatible with other devices in the TPS3305 family?
Yes, all TPS3305-x variants (including TPS3305-18D, TPS3305-25D, and TPS3305-33D) share identical SOIC-8 pinouts and electrical interfaces. The only differences are the factory-programmed voltage thresholds for SENSE1 and SENSE2. This allows drop-in replacement across variants when changing rail configurations - for example, upgrading from 2.5V core to 3.3V core requires only substituting TPS3305-25D with TPS3305-33D without PCB modification. The TPS3305-25D maintains full functional compatibility within the family.
TPS3305-25D Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Bulk
- 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
TPS3305-25D FAQ
1.How can I place an order for TPS3305-25D through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS3305-25D 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 TPS3305-25D reliable?
The price and inventory of TPS3305-25D are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS3305-25D is usually 5 days.
3.What payment methods are accepted for TPS3305-25D?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS3305-25D transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS3305-25D?
TPS3305-25D orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS3305-25D 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 TPS3305-25D?
For technical support, including TPS3305-25D datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS3305-25D requirements.
6.How does Aetrix verify that TPS3305-25D is sourced from the original manufacturer or authorized distributors?
All TPS3305-25D 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 TPS3305-25D meets industry standards.
7.What is the process for return or replacement of TPS3305-25D?
All TPS3305-25D units undergo pre-shipment inspection (PSI). If there is an issue with TPS3305-25D, 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 TPS3305-25D part is unused and in its original packaging.
Return procedure for TPS3305-25D:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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