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Texas Instruments TPS3813I50DBVT
- Part No.:
- TPS3813I50DBVT
- Manufacturer:
- Texas Instruments
- Category:
- Supervisors
- Package:
- SOT-23-6
- Datasheet:
-
TPS3813I50DBVT.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:804
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Product details
Overview
TPS3813I50DBVT from Texas Instruments is a window-watchdog supervisory IC for microcontroller and DSP systems, featuring a fixed 4.55V supply voltage threshold (VIT), 25ms power-on reset delay, 9µA typical supply current, open-drain RESET output, and operation from –40°C to +85°C. It ensures safe system initialization and runtime fault detection in safety-critical embedded control applications.
For engineers reviewing the TPS3813I50DBVT datasheet, TPS3813I50DBVT pinout, TPS3813I50DBVT application, or TPS3813I50DBVT equivalent, key selection criteria include its programmable watchdog window ratio (set via WDR/WDT pins), 4.55V precision VIT with 60mV hysteresis, SOT-23-6 package compatibility, and support for capacitor-programmable timeout up to 2.5s.
Technical Context
The TPS3813I50DBVT integrates a precision voltage supervisor and a user-configurable window-watchdog timer in a single 6-pin SOT-23 device. Its internal bandgap reference enables stable 4.55V threshold detection with 60mV hysteresis, while the watchdog's upper timeout boundary is set by WDT pin state (GND/VDD) or external capacitor (155pF–63nF), and lower boundary by WDR pin state (GND/VDD).
During power-up, RESET asserts below VPOR (1.1V) and remains active until VDD exceeds VIT (4.55V), then delays deassertion for 25ms typical. The watchdog requires WDI pulses within a defined time window-e.g., with WDT = VDD and WDR = GND, window ratio is 1:32, yielding ~78.2ms lower bound and ~2.5s upper bound at 25°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIT Threshold | 4.55V ±0.1V - precisely monitors 5V-rail systems; triggers reset if supply drops below this level |
| Hysteresis (VHYS) | 60mV - prevents false RESET toggling during slow or noisy VDD recovery near threshold |
| Power-on Reset Delay (td) | 25ms typical - guarantees sufficient hold time for microcontroller initialization before release |
| Supply Current (IDD) | 9µA typical at 2V - enables ultra-low-power supervision in battery-backed or energy-constrained systems |
| RESET Output Type | Open-drain - allows flexible pull-up to any rail ≤6V, supporting mixed-voltage interface designs |
| Watchdog Window Ratio | Configurable 1:25.8 to 1:127.7 - sets strict lower-bound timing for software execution validation |
| Operating Temperature | –40°C to +85°C - qualified for industrial and medical equipment environments |
Pinout & Package
TPS3813I50DBVT is housed in a 6-pin SOT-23 (DBV) package measuring 2.90mm × 1.60mm, optimized for space-constrained PCB layouts and automated assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - WDI | Watchdog input | Must receive periodic edge-triggered pulses from MCU; floating prohibited - requires pulldown on GPIO-driven lines |
| 2 - GND | Ground reference | Primary return path for internal circuitry and RESET output; must be low-impedance connection |
| 3 - WDT | Watchdog timeout control | Configures upper watchdog boundary: tied to GND (0.25s), VDD (2.5s), or external capacitor (programmable) |
| 4 - VDD | Supply & supervision input | Monitored rail (2–6V); powers internal reference, logic, and timers; bypass capacitor (0.1µF) required |
| 5 - WDR | Watchdog window ratio control | Sets lower watchdog boundary: tied to GND (1:32 ratio) or VDD (1:127.7 ratio) - not floatable |
| 6 - RESET | Open-drain reset output | Drives low on fault; high-impedance otherwise - requires external pullup resistor to target logic rail |
Key Features
| Feature | Design Value |
|---|---|
| Programmable window-watchdog | Enables dual-bound timing validation: detects both software hangs (no pulse) and premature/late pulses |
| Fixed 4.55V VIT threshold | Matches nominal 5V supply rails without external resistive divider - reduces BOM count and layout area |
| 25ms power-on reset delay | Guarantees full microcontroller core and peripheral stabilization before release - no external RC needed |
| 9µA typical supply current | Minimizes quiescent load on always-on power domains - critical for battery-powered safety monitors |
| Open-drain RESET with 6V tolerance | Allows direct interfacing to 3.3V, 5V, or mixed-voltage MCUs using a single pullup resistor |
Applications
| Active Antenna System mMIMO (AAS) | Electricity Meters |
|---|---|
Use Scenario: Real-time beamforming control in 5G base station radios where firmware crashes must trigger immediate hardware reset to maintain RF safety compliance. IC Role / Device Role / Timing Role: Voltage supervisor and window-watchdog - monitors 5V power rail and validates DSP watchdog pulses within 1:32 window (e.g., 78ms/2.5s) to detect stalled control loops. Use Value: Prevents hazardous RF exposure by enforcing deterministic reset within <100ms of software failure - meets IEC 62368-1 functional safety requirements. |
Use Scenario: Tamper-resistant utility meter firmware that must survive long-term operation under variable grid voltage and temperature stress. IC Role / Device Role / Timing Role: Primary power-on supervisor and runtime watchdog - asserts RESET if 5V rail dips below 4.55V or WDI pulses fall outside programmed window during metrology calculations. Use Value: Ensures meter data integrity and regulatory compliance (ANSI C12.1, EN 50470) by eliminating silent firmware corruption without adding external timing components. |
| Safety Critical Systems | HVAC Controller |
Use Scenario: Medical infusion pump controller requiring fail-safe behavior per IEC 62304 Class C software safety classification. IC Role / Device Role / Timing Role: Dual-role supervisor - provides 25ms POR delay for ARM Cortex-M4 boot sequence and enforces strict WDI pulse timing (e.g., 1:127.7 window) to validate motor control thread liveness. Use Value: Guarantees hardware-level reset initiation within 300ms of missed watchdog pulse - satisfies ISO 14971 risk control requirements for life-critical devices. |
Use Scenario: Commercial building HVAC controller operating continuously across –25°C to +70°C ambient with variable 24VAC-derived 5V supply. IC Role / Device Role / Timing Role: Supply voltage monitor and watchdog coordinator - detects brownout events on rectified 5V rail and validates communication stack heartbeat pulses against 1:32 window. Use Value: Eliminates uncontrolled relay chatter or fan lockup by forcing controlled restart before thermal runaway - extends field reliability beyond 15-year service life. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage supervision and watchdog applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3813K33DBVT | 2.93V VIT threshold, 40mV hysteresis | Designed for 3.3V systems - unsuitable for 5V rail monitoring without external scaling | Select only when supervising 3.3V logic supplies; not drop-in for TPS3813I50DBVT's 4.55V requirement |
| MAX6369KA29+T | 2.93V VIT, 1.6s fixed watchdog timeout, no window capability | Lacks programmable window ratio - cannot detect early/late WDI pulses, only absence | Use where simple timeout suffices; avoid when dual-bound software execution validation is mandated |
Compared with TPS3813I50DBVT, TPS3813K33DBVT serves 3.3V systems but lacks 4.55V precision, while MAX6369KA29+T offers fixed timeout without windowing - neither supports the TPS3813I50DBVT's safety-critical dual-bound watchdog enforcement for 5V applications.
Availability
TPS3813I50DBVT is available at Aetrix Electronics and suitable for active antenna systems, electricity meters, and safety-critical medical devices requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.
Supply support for TPS3813I50DBVT 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 decades of experience in high-reliability industrial and automotive IC design.
The TPS3813xxx family was developed specifically for safety-aware processor supervision - integrating precision voltage monitoring and programmable window-watchdog functionality into compact SOT-23 packages for space- and reliability-constrained applications.
FAQ
What is the exact supply voltage threshold (VIT) for TPS3813I50DBVT?
The TPS3813I50DBVT has a fixed negative-going input threshold voltage (VIT) of 4.55V, with a guaranteed range of 4.45V to 4.65V over –40°C to +85°C. This value is factory-trimmed and does not require external resistors - it is specifically designed to supervise nominal 5V power rails without scaling components.
How is the watchdog window ratio configured on TPS3813I50DBVT?
The watchdog window ratio on TPS3813I50DBVT is set exclusively by the WDR pin: tying WDR to GND selects a 1:32 ratio (e.g., ~78ms lower bound with 2.5s upper bound), while tying WDR to VDD selects a 1:127.7 ratio (~19.6ms lower bound). WDR must never be left floating - it must be hard-wired to GND or VDD.
Does TPS3813I50DBVT require an external capacitor for basic operation?
No, TPS3813I50DBVT operates fully without external capacitors for its core functions. A 0.1µF ceramic bypass capacitor on VDD is mandatory for noise immunity and stable startup, but the watchdog timeout can be set using only WDT pin states (GND/VDD) - external capacitor (155pF–63nF) is optional for fine-grained programmability.
What is the maximum allowable supply voltage for TPS3813I50DBVT?
The absolute maximum supply voltage (VDD) for TPS3813I50DBVT is 6.5V, but recommended operating conditions specify 2V to 6V. Continuous operation above 6V is not permitted; operation at 7V is limited to ≤1000 hours total lifetime per TI's absolute maximum ratings guidance.
Can TPS3813I50DBVT's RESET output drive a 3.3V microcontroller directly?
Yes - the TPS3813I50DBVT features an open-drain RESET output rated for up to 6V, allowing direct interface to 3.3V MCUs. Simply connect a pullup resistor from RESET to the 3.3V rail; the output will sink current when asserted (low) and float high-impedance otherwise, ensuring correct logic levels without level-shifting circuitry.
TPS3813I50DBVT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- SOT-23-6
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.55V
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- 20ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-6
TPS3813I50DBVT FAQ
1.How can I place an order for TPS3813I50DBVT through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS3813I50DBVT 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 TPS3813I50DBVT reliable?
The price and inventory of TPS3813I50DBVT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS3813I50DBVT is usually 5 days.
3.What payment methods are accepted for TPS3813I50DBVT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS3813I50DBVT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS3813I50DBVT?
TPS3813I50DBVT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS3813I50DBVT 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 TPS3813I50DBVT?
For technical support, including TPS3813I50DBVT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS3813I50DBVT requirements.
6.How does Aetrix verify that TPS3813I50DBVT is sourced from the original manufacturer or authorized distributors?
All TPS3813I50DBVT 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 TPS3813I50DBVT meets industry standards.
7.What is the process for return or replacement of TPS3813I50DBVT?
All TPS3813I50DBVT units undergo pre-shipment inspection (PSI). If there is an issue with TPS3813I50DBVT, 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 TPS3813I50DBVT part is unused and in its original packaging.
Return procedure for TPS3813I50DBVT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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