TPS3813K33-EP

ACTIVE

Enhanced Product Processor Supervisory Circuits With Window-Watchdog

TPS3813K33-EP

ACTIVE

Product details

Number of supplies monitored 1 Threshold voltage 1 (typ) (V) 2.93 Features Reset time delay, Undervoltage monitor only, Watchdog timer Reset threshold accuracy (%) 2 Iq (typ) (mA) 0.009 Output driver type/reset output Active-low, Open-drain Time delay (ms) 25 Supply voltage (min) (V) 2 Supply voltage (max) (V) 6 Rating HiRel Enhanced Product Watchdog timer WDI (s) Programmable Operating temperature range (°C) -55 to 125
Number of supplies monitored 1 Threshold voltage 1 (typ) (V) 2.93 Features Reset time delay, Undervoltage monitor only, Watchdog timer Reset threshold accuracy (%) 2 Iq (typ) (mA) 0.009 Output driver type/reset output Active-low, Open-drain Time delay (ms) 25 Supply voltage (min) (V) 2 Supply voltage (max) (V) 6 Rating HiRel Enhanced Product Watchdog timer WDI (s) Programmable Operating temperature range (°C) -55 to 125
SOT-23 (DBV) 6 8.12 mm² 2.9 x 2.8
  • Controlled Baseline
    • One Assembly/Test Site, One Fabrication Site
  • Extended Temperature Performance of -55°C to 125°C
  • Enhanced Diminishing Manufacturing Sources (DMS) Support
  • Enhanced Product-Change Notification
  • Qualification Pedigree(1)
  • Window-Watchdog With Programmable Delay and Window Ratio
  • 6-Pin SOT-23 Package
  • Supply Current of 9 µA (Typ)
  • Power On Reset Generator With a Fixed Delay Time of 25 ms
  • Precision Supply Voltage Monitor 2.5 V, 3 V, 3.3 V, 5 V
  • Open-Drain Reset Output
  • APPLICATIONS
    • Applications Using DSPs, Microcontrollers, or Microprocessors
    • Safety Critical Systems
    • Automotive Systems
    • Healing Systems

(1)Component qualification in accordance with JEDEC and industry standards to ensure reliable operation over an extended temperature range. This includes, but is not limited to, Highly Accelerated Stress Test (HAST) or biased 85/85, temperature cycle, autoclave or unbiased HAST, electromigration, bond intermetallic life, and mold compound life. Such qualification testing should not be viewed as justifying use of this component beyond specified performance and environmental limits.

  • Controlled Baseline
    • One Assembly/Test Site, One Fabrication Site
  • Extended Temperature Performance of -55°C to 125°C
  • Enhanced Diminishing Manufacturing Sources (DMS) Support
  • Enhanced Product-Change Notification
  • Qualification Pedigree(1)
  • Window-Watchdog With Programmable Delay and Window Ratio
  • 6-Pin SOT-23 Package
  • Supply Current of 9 µA (Typ)
  • Power On Reset Generator With a Fixed Delay Time of 25 ms
  • Precision Supply Voltage Monitor 2.5 V, 3 V, 3.3 V, 5 V
  • Open-Drain Reset Output
  • APPLICATIONS
    • Applications Using DSPs, Microcontrollers, or Microprocessors
    • Safety Critical Systems
    • Automotive Systems
    • Healing Systems

(1)Component qualification in accordance with JEDEC and industry standards to ensure reliable operation over an extended temperature range. This includes, but is not limited to, Highly Accelerated Stress Test (HAST) or biased 85/85, temperature cycle, autoclave or unbiased HAST, electromigration, bond intermetallic life, and mold compound life. Such qualification testing should not be viewed as justifying use of this component beyond specified performance and environmental limits.

The TPS3813 family of supervisory circuits provides 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 TPS3813 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 TPS3813 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 TPS3813 devices are characterized for operation over a temperature range of -55°C to 125°C.

The TPS3813 family of supervisory circuits provides 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 TPS3813 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 TPS3813 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 TPS3813 devices are characterized for operation over a temperature range of -55°C to 125°C.

Download View video with transcript Video

Check TI.com inventory for similar products

Products with similar specifications, sorted by available TI.com inventory.

View now

Similar products you might be interested in

open-in-new Compare alternates
Same functionality with different pin-out to the compared device
TPS35-Q1 ACTIVE Automotive nano-quiescent-current precision supervisor with timeout watchdog timer Improved accuracy and lower quiescent current

Technical documentation

star =Top documentation for this product selected by TI
No results found. Please clear your search and try again.
View all 5
Type Title Date
* Data sheet TPS3813J25-EP, TPS3813L30-EP, TPS3813K33-EP, TPS3813I50-EP datasheet (Rev. A) 24 May 2006
* Radiation & reliability report TPS3813K33MDBVREP Reliability Report 05 Oct 2016
* VID TPS3813K33-EP VID V6206627 21 Jun 2016
E-book Voltage Supervisor and Reset ICs: Tips, Tricks and Basics 28 Jun 2019
Application note All Window Watchdog Supervisors 09 Sep 2009

Design & development

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

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 (...)
Package Pins CAD symbols, footprints & 3D models
SOT-23 (DBV) 6 Ultra Librarian

Ordering & quality

Information included:
  • RoHS
  • REACH
  • Device marking
  • Lead finish/Ball material
  • MSL rating/Peak reflow
  • MTBF/FIT estimates
  • Material content
  • Qualification summary
  • Ongoing reliability monitoring
Information included:
  • Fab location
  • Assembly location

Support & training

TI E2E™ forums with technical support from TI engineers

Content is provided "as is" by TI and community contributors and does not constitute TI specifications. See terms of use.

If you have questions about quality, packaging or ordering TI products, see TI support. ​​​​​​​​​​​​​​

Videos