TPS3813
- 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 (VIT): 2.5 V, 3 V, 3.3 V, and 5 V
- Open-drain reset output
- Temperature range: –40°C to 85°C
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.
技術文件
類型 | 標題 | 日期 | ||
---|---|---|---|---|
* | Data sheet | TPS3813xxx Family Processor Supervisory Circuits With Window-Watchdog datasheet (Rev. I) | PDF | HTML | 2021年 9月 9日 |
Application note | Voltage Supervisors (Reset ICs): Frequently Asked Questions (FAQs) (Rev. A) | 2020年 3月 17日 | ||
Selection guide | Voltage Supervisors (Reset ICs) Quick Reference Guide (Rev. H) | 2020年 2月 28日 | ||
E-book | Voltage Supervisor and Reset ICs: Tips, Tricks and Basics | 2019年 6月 28日 | ||
EVM User's guide | TPS3813XXXEVM for Processor Voltage Supervisor User's Guide | 2016年 9月 30日 | ||
Application note | Window Watchdog Calculator for TPS3813 Voltage Supervisors (Rev. A) | 2016年 9月 13日 | ||
Technical article | Why monitoring voltages matters | PDF | HTML | 2015年 6月 17日 | |
Application note | Choosing an Appropriate Pull-up/Pull-down Resistor for Open Drain Outputs | 2011年 9月 19日 | ||
Application note | All Window Watchdog Supervisors | 2009年 9月 9日 |
設計與開發
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TPS3813Q1EVM — 具有窗口看門狗功能的 TPS3813-Q1 處理器監控電路評估模組
PSPICE-FOR-TI — PSpice® for TI 設計與模擬工具
封裝 | 引腳 | 下載 |
---|---|---|
SOT-23 (DBV) | 6 | 檢視選項 |
訂購與品質
- RoHS
- REACH
- 產品標記
- 鉛塗層/球物料
- MSL 等級/回焊峰值
- MTBF/FIT 估算值
- 材料內容
- 資格摘要
- 進行中可靠性監測
- 晶圓廠位置
- 組裝地點