SGLS143E December   2002  – March 2025 TPS3820-Q1 , TPS3823-Q1 , TPS3824-Q1 , TPS3825-Q1 , TPS3828-Q1

PRODUCTION DATA  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Device Comparison Table
  6. 5 Pin Configuration and Functions
    1.     Pin Functions
  7. 6 Specifications
    1. 6.1 Absolute Maximum Ratings
    2. 6.2 ESD Ratings
    3. 6.3 Recommended Operating Conditions
    4. 6.4 Thermal Information
    5. 6.5 Electrical Characteristics
    6. 6.6 Timing Requirements
    7. 6.7 Switching Characteristics
    8. 6.8 Timing Diagram
    9. 6.9 Typical Characteristics
  8. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 Manual Reset ( MR)
      2. 7.3.2 Active High or Active Low Output
      3. 7.3.3 Push-Pull or Open-Drain Output
      4. 7.3.4 Watchdog Timer (WDI)
    4. 7.4 Device Functional Modes
  9. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Applications
      1. 8.2.1 Supply Rail Monitoring with Watchdog Time-out and 200ms Delay
        1. 8.2.1.1 Design Requirements
        2. 8.2.1.2 Detailed Design Procedure
        3. 8.2.1.3 Application Curve
      2. 8.2.2 Decoupling WDI During Reset Event
    3. 8.3 Power Supply Recommendations
    4. 8.4 Layout
      1. 8.4.1 Layout Guidelines
      2. 8.4.2 Layout Example
  10. 9 Device and Documentation Support
    1. 9.1 Documentation Support
      1. 9.1.1 Related Documentation
        1. 9.1.1.1 Related Links
    2. 9.2 Receiving Notification of Documentation Updates
    3. 9.3 Support Resources
    4. 9.4 Trademarks
    5. 9.5 Electrostatic Discharge Caution
    6. 9.6 Glossary
  11. 10Revision History
  12. 11Mechanical, Packaging, and Orderable Information

Package Options

Refer to the PDF data sheet for device specific package drawings

Mechanical Data (Package|Pins)
  • DBV|5
Thermal pad, mechanical data (Package|Pins)
Orderable Information

8.2.1 Supply Rail Monitoring with Watchdog Time-out and 200ms Delay

The TPS3823-xx-Q1 can be used to monitor the supply rail for devices such as microcontrollers. The downstream device is enabled by the TPS3823-xx-Q1 once the voltage on the supply pin (VDD) is above the internal threshold voltage (VIT– + VHYS). The downstream device is disabled by the TPS3823-xx-Q1 when VDD falls below the threshold voltage minus the hysteresis voltage (VIT–). The TPS3823-xx-Q1 also issues a reset signal if the WDI input is not periodically triggered by a positive or negative transition at WDI. When the supervising system fails to retrigger the watchdog circuit within the time-out interval, ttout, RESET becomes active for the time period td.

Some applications require a shorter reset signal than the 200ms that most of the TPS382x-xx-Q1 family provide. In these cases, the TPS3820-xx-Q1is a good choice because the device has a delay time of only 25ms. If an open-drain output is needed, replace the TPS3823-xx-Q1 with the TPS3828-xx-Q1 (if the WDI input must be active while RESET is low, see Section 8.2.2). Figure 8-1 shows the TPS3823-33-Q1 in a typical application.

TPS3820-Q1 TPS3823-Q1 TPS3824-Q1 TPS3825-Q1 TPS3828-Q1 Supply Rail Monitoring With Watchdog Time-outFigure 8-1 Supply Rail Monitoring With Watchdog Time-out