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Product details

Parameters

Number of supplies monitored 1 Threshold voltage 1 (Typ) (V) 2.25, 2.64, 2.93, 4.55 Features Watchdog timer Reset threshold accuracy (%) 2.4 Output driver type/reset output Active-low, Open-drain Time delay (ms) 25 VCC (Max) (V) 6 Rating Catalog VCC (Min) (V) 2 Watchdog timer WDI (sec) Programmable Operating temperature range (C) -40 to 85 open-in-new Find other Supervisor & reset ICs

Package | Pins | Size

SOT-23 (DBV) 6 5 mm² 2.9 x 1.6 open-in-new Find other Supervisor & reset ICs

Features

  • Window-Watchdog With Programmable Delay and Window Ratio
  • 6-Pin SOT-23 Package
  • Supply Current of 9 µA (Typical)
  • Power-On Reset Generator With a Fixed Delay Time of 25 ms
  • Precision Supply Voltage Monitor: 2.5 V, 3 V, 3.3 V, and 5 V
  • Open-Drain Reset Output
  • Temperature Range: –40°C to 85°C
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Description

The TPS3813xxx family of supervisory circuits provide circuit initialization and timing supervision, primarily for DSPs and processor-based systems.

During power on, RESET is asserted when supply voltage (VDD) becomes higher than 1.1 V. Thereafter, the supervisory circuit monitors VDD and keeps RESET active as long as VDD remains below the threshold voltage (VIT). An internal timer delays the return of the output to the inactive state (high) to ensure proper system reset. The delay time, td = 25 ms typical, starts after VDD has risen above the threshold voltage (VIT). When the supply voltage drops below the threshold voltage (VIT), the output becomes active (low) again. No external components are required. All the devices of this family have a fixed-sense threshold voltage (VIT) set by an internal voltage divider.

For safety critical applications the TPS3813xxx family incorporates a so-called window-watchdog with programmable delay and window ratio. The upper limit of the watchdog time-out can be set by either connecting WDT to GND, VDD, or using an external capacitor. The lower limit and thus the window ratio is set by connecting WDR to GND or VDD. The supervised processor now needs to trigger the TPS3813xxx within this window not to assert a RESET.

The product spectrum is designed for supply voltages of 2.5 V, 3 V, 3.3 V, and 5 V. The circuits are available in a 6-pin SOT-23 package.

The TPS3813xxx devices are characterized for operation over a temperature range of –40°C to 85°C.

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Technical documentation

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Type Title Date
* Datasheet TPS3813xxx Family Processor Supervisory Circuits With Window-Watchdog datasheet (Rev. H) Feb. 18, 2016
Selection guides Voltage Supervisors (Reset ICs) Quick Reference Guide (Rev. H) Feb. 28, 2020
More literature Voltage Supervisor and Reset ICs: Tips, Tricks and Basics Jun. 28, 2019
Application notes Voltage Supervisors (Reset ICs): Frequently Asked Questions (FAQs) Oct. 09, 2018
User guides TPS3813XXXEVM for Processor Voltage Supervisor User's Guide Sep. 30, 2016
Application notes Window Watchdog Calculator for TPS3813 Voltage Supervisors (Rev. A) Sep. 13, 2016
Technical articles Why monitoring voltages matters Jun. 17, 2015
Technical articles A New Understanding: Blast Motion redefines movement, tracking and training for athletes. Aug. 06, 2014
Technical articles Improving Fly-Buck Regulation Using Opto (Part-1) Jul. 15, 2014
Technical articles Altium and WEBENCH – together at last Jul. 12, 2014
Application notes Choosing an Appropriate Pull-up/Pull-down Resistor for Open Drain Outputs Sep. 19, 2011
Application notes All Window Watchdog Supervisors Sep. 09, 2009

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Hardware development

EVALUATION BOARDS Download
document-generic User guide
$49.00
Description
The TPS3813-Q1 device is a processor supervisory circuit with watchdog functionality for applications that use DSPs, microcontrollers (MCUs) or microprocessors, or are safety critical. The incorporated window watchdog allows for programmable delay and window ratio that can realease a (...)
Features
  • Major pins of the device are broken out into onboard test points
  • Onboard test point to exercise watchdog functionality
  • Onboard jumpers for easy IC configuration and attachement for probes
  • Q200-qualified passives in EVM solution

CAD/CAE symbols

Package Pins Download
SOT-23 (DBV) 6 View options

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