SNVSB66A July   2018  – October 2021 TPS3431

PRODUCTION DATA  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Pin Configuration and Functions
  6. 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 Timing Diagrams
    8. 6.8 Typical Characteristics
  7. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 Enable Input (EN) and Enable Output (ENOUT)
      2. 7.3.2 Watchdog Mode
        1. 7.3.2.1 CWD
        2. 7.3.2.2 Watchdog Input WDI
        3. 7.3.2.3 Watchdog Output WDO
        4. 7.3.2.4 SET1
    4. 7.4 Device Functional Modes
      1. 7.4.1 VDD is Below VPOR ( VDD < VPOR)
      2. 7.4.2 Above Power-On-Reset, But Less Than VDD(min) (VPOR ≤ VDD < VDD(min))
      3. 7.4.3 Normal Operation (VDD ≥ VDD(min))
  8. 8 Application and Implementation
    1. 8.1 Application Information
      1. 8.1.1 CWD Functionality
        1. 8.1.1.1 Factory-Programmed Timing Options
        2. 8.1.1.2 CWD Adjustable Capacitor Watchdog Timeout
    2. 8.2 Typical Application
      1. 8.2.1 Design 1 Requirements
      2. 8.2.2 Detailed Design 1 Procedure
        1. 8.2.2.1 Calculating WDO Pullup Resistor Design 1
        2. 8.2.2.2 Setting the Watchdog Design 1
      3. 8.2.3 Application Curves Design 1
    3. 8.3 Programmable Application
      1. 8.3.1 Design 2 Requirements
      2. 8.3.2 Detailed Design 2 Procedure
        1. 8.3.2.1 Calculating WDO Pullup Resistor Design 2
        2. 8.3.2.2 Setting the Watchdog Design 2
        3. 8.3.2.3 Watchdog Disabled During Initialization Period Design 2
        4. 8.3.2.4 Programmable Disable Feature Design 2
      3. 8.3.3 Application Curves Design 2
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Example
  11. 11Device and Documentation Support
    1. 11.1 Device Support
    2. 11.2 Documentation Support
      1. 11.2.1 Related Documentation
    3. 11.3 Receiving Notification of Documentation Updates
    4. 11.4 Support Resources
    5. 11.5 Trademarks
    6. 11.6 Electrostatic Discharge Caution
    7. 11.7 Glossary
  12. 12Mechanical, Packaging, and Orderable Information

6.5 Electrical Characteristics

at 1.8 V ≤ VDD ≤ 6.5 V over the operating temperature range of –40°C ≤ TJ ≤ +125°C (unless otherwise noted); the open-drain pullup resistors are 10 kΩ; typical values are at TJ = 25°C
PARAMETERTEST CONDITIONSMINTYPMAXUNIT
GENERAL CHARACTERISTICS
VDD(2)(3)Supply voltage1.86.5V
IDDSupply current1019µA
VPOR(1)Power-on reset voltageVOL(MAX) = 0.25 V0.8V
WINDOW WATCHDOG FUNCTION
IENEN pin internal pullup currentVEN = 0V500620700nA
ICWDCWD pin charge currentCWD = 0.5 V347375403nA
VCWDCWD pin threshold voltage1.1961.211.224V
VOLENOUT,   WDO output lowVDD = 5 V, ISINK = 3 mA0.4V
IDENOUT,   WDO output leakage currentVDD = 1.8 V, VWDO = 6.5 V1µA
VILLow-level input voltage (EN, SET1)0.25V
VIHHigh-level input voltage (EN, SET1)0.8V
VIL(WDI)Low-level input voltage (WDI)0.3 × VDDV
VIH(WDI)High-level input voltage (WDI)0.8 × VDDV
(1) When VDD falls below VPOR, WDI and ENOUT is undefined.
(2) When VDD falls below VDDMIN, WDI is ignored and ENOUT is driven low
(3) During power-on, VDD must be a minimum 1.8 V for at least 300 µs before WDI is active and ENOUT is high impedance.