Product details

Number of supplies monitored 1 Threshold voltage 1 (Typ) (V) 1.67, 1.73, 2.32, 2.4, 2.79, 2.88, 3.07, 3.17, 4.65, 4.8 Features Manual reset capable, Watchdog disable, Watchdog timer Reset threshold accuracy (%) 0.8 Output driver type/reset output Active-low, Open-drain Time delay (ms) 200 Rating Catalog Watchdog timer WDI (sec) Programmable Operating temperature range (C) -40 to 125
Number of supplies monitored 1 Threshold voltage 1 (Typ) (V) 1.67, 1.73, 2.32, 2.4, 2.79, 2.88, 3.07, 3.17, 4.65, 4.8 Features Manual reset capable, Watchdog disable, Watchdog timer Reset threshold accuracy (%) 0.8 Output driver type/reset output Active-low, Open-drain Time delay (ms) 200 Rating Catalog Watchdog timer WDI (sec) Programmable Operating temperature range (C) -40 to 125
VSON (DRB) 8 9 mm² 3 x 3
  • Input voltage range: VDD = 1.6 V to 6.5 V
  • 0.8% Voltage threshold accuracy
  • Low quiescent current: IDD = 10 µA (typical)
  • User-programmable watchdog timeout
  • Open-drain outputs
  • Precision undervoltage monitoring:
    • Supports common rails from 1.8 V to 5.0 V
    • 4% and 7% Undervoltage thresholds available
    • 0.5% Hysteresis
  • Watchdog disable feature
  • Factory-programmed precision watchdog and reset timers
  • Manual reset input (MR)
  • Available in a small 3-mm × 3-mm, 8-Pin VSON package
  • Junction operating temperature range: –40°C to +125°C
  • Input voltage range: VDD = 1.6 V to 6.5 V
  • 0.8% Voltage threshold accuracy
  • Low quiescent current: IDD = 10 µA (typical)
  • User-programmable watchdog timeout
  • Open-drain outputs
  • Precision undervoltage monitoring:
    • Supports common rails from 1.8 V to 5.0 V
    • 4% and 7% Undervoltage thresholds available
    • 0.5% Hysteresis
  • Watchdog disable feature
  • Factory-programmed precision watchdog and reset timers
  • Manual reset input (MR)
  • Available in a small 3-mm × 3-mm, 8-Pin VSON package
  • Junction operating temperature range: –40°C to +125°C

The TPS3851 combines a precision voltage supervisor with a programmable watchdog timer. The TPS3851 comparator achieves a 0.8% accuracy (–40°C to +125°C) for the undervoltage (VITN) threshold on the VDD pin. The TPS3851 also includes accurate hysteresis on the undervoltage threshold making the device ideal for use with tight tolerance systems. The supervisor RESET delay features a 15% accuracy, high-precision delay timing.

The TPS3851 includes a programmable watchdog timer for a wide variety of applications. The dedicated watchdog output (WDO) enables increased resolution to help determine the nature of fault conditions. The watchdog timeouts can be programmed either by an external capacitor, or by factory-programmed default delay settings. The watchdog can be disabled via logic pins to avoid undesired watchdog timeouts during the development process.

TPS3851 is available in a small 3.00-mm × 3.00-mm, 8-pin VSON package.

The TPS3851 combines a precision voltage supervisor with a programmable watchdog timer. The TPS3851 comparator achieves a 0.8% accuracy (–40°C to +125°C) for the undervoltage (VITN) threshold on the VDD pin. The TPS3851 also includes accurate hysteresis on the undervoltage threshold making the device ideal for use with tight tolerance systems. The supervisor RESET delay features a 15% accuracy, high-precision delay timing.

The TPS3851 includes a programmable watchdog timer for a wide variety of applications. The dedicated watchdog output (WDO) enables increased resolution to help determine the nature of fault conditions. The watchdog timeouts can be programmed either by an external capacitor, or by factory-programmed default delay settings. The watchdog can be disabled via logic pins to avoid undesired watchdog timeouts during the development process.

TPS3851 is available in a small 3.00-mm × 3.00-mm, 8-pin VSON package.

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Technical documentation

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Type Title Date
* Data sheet TPS3851 Precision Voltage Supervisor with Integrated Watchdog Timer datasheet (Rev. A) 20 May 2021
Technical article 3 quiescent-current (Iq) specifications you need to understand 12 Nov 2021
Application note Voltage Supervisors (Reset ICs): Frequently Asked Questions (FAQs) (Rev. A) 17 Mar 2020
Selection guide Voltage Supervisors (Reset ICs) Quick Reference Guide (Rev. H) 28 Feb 2020
E-book Voltage Supervisor and Reset ICs: Tips, Tricks and Basics 28 Jun 2019
Technical article Exploring watchdog timer applications 02 Feb 2017
Technical article What is a watchdog timer and why is it important? 11 Jan 2017
User guide TPS3851EVM-780 Evaluation Module 17 Nov 2016

Design & development

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Evaluation board

TPS3851EVM-780 — TPS3851 high-accuracy supervisor with window watchdog evaluation module

The TPS3851EVM-780 evaluation module (EVM) is designed for a typical configuration to evaluate the operation and performance of the TPS3851 low-quiescent current, 0.8% accuracy supervisor with integrated window watchdog timer. The EVM circuit board is configured to be a reference design for (...)
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Simulation model

TPS3851XyyS PSpice Transient Model (Rev. A)

SBVM650A.ZIP (66 KB) - PSpice Model
Simulation model

TPS3851XyyS Unencrypted PSpice Transient Model (Rev. A)

SBVM651A.ZIP (6 KB) - PSpice Model
Simulation model

TPS3851XyyE PSpice Transient Model (Rev. A)

SBVM652A.ZIP (66 KB) - PSpice Model
Simulation model

TPS3851XyyE Unencrypted PSpice Transient Model (Rev. A)

SBVM653A.ZIP (7 KB) - PSpice Model
Simulation tool

PSPICE-FOR-TI — PSpice® for TI design and simulation tool

PSpice® for TI is a design and simulation environment that helps evaluate functionality of analog circuits. This full-featured, design and simulation suite uses an analog analysis engine from Cadence®. Available at no cost, PSpice for TI includes one of the largest model libraries in the (...)
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