The TPS3813-Q1 supervisory circuits provide circuit initialization and timing supervision, primarily for DSPs and processor-based systems.
During power on, the RESET pin is asserted when the supply voltage (VDD) becomes higher than 1.1 V. Thereafter, the supervisory circuit monitors VDD and keeps the RESET pin active as long as VDD remains below the threshold voltage (VIT).
An internal timer delays the return of the output to the inactive (high) state to ensure proper system reset. The delay time, td = 25 ms typical, begins 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-Q1 family of device s incorporate a window-watchdog with programmable delay and window ratio. The upper limit of the watchdog time-out can be set by either connecting the WDT pin to GND or VDD, or by using an external capacitor. The lower limit, and thus the window ratio, is set by connecting the WDR pin to GND or VDD. The RESET pin will assert a reset to the microcontroller if the watchdog is incorrectly serviced.
The product spectrum is designed for supply voltages of 2.5 V, 3 V, 3.3 V, and 5 V. The device s are available in a 6-pin SOT-23 package. The device s are characterized for operation over a temperature range of –40°C to 125°C.
Products with similar specifications, sorted by available TI.com inventory.
| Type | Title | Date | ||
|---|---|---|---|---|
| * | Data sheet | TPS3813-Q1 Automotive Processor Supervisory Circuits With Window-Watchdog datasheet (Rev. H) | PDF | HTML | 09 Sep 2021 |
| Functional safety information | TPS3813-Q1 Functional Safety, FIT Rate, Failure Mode Distribution and Pin FMA | PDF | HTML | 25 Nov 2020 | |
| Application note | Voltage Supervisors (Reset ICs): Frequently Asked Questions (FAQs) (Rev. A) | 17 Mar 2020 | ||
| Functional safety information | TPS3813-Q1 Functional Safety FIT Rate and Failure Mode Distribution | 18 Dec 2019 | ||
| E-book | Voltage Supervisor and Reset ICs: Tips, Tricks and Basics | 28 Jun 2019 | ||
| Application note | Window Watchdog Calculator for TPS3813 Voltage Supervisors (Rev. A) | 13 Sep 2016 | ||
| Application note | All Window Watchdog Supervisors | 09 Sep 2009 |
For additional terms or required resources, click any title below to view the detail page where available.
| Package | Pins | CAD symbols, footprints & 3D models |
|---|---|---|
| SOT-23 (DBV) | 6 | Ultra Librarian |
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