SCPS272C October   2019  – January 2021 TCA9511A

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 Switching Characteristics
    8. 6.8 Typical Characteristics
  7. 7 Parameter Measurement Information
  8. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1 Hot bus insertion
      2. 8.3.2 Pre-charge voltage
      3. 8.3.3 Rise time accelerators
      4. 8.3.4 Bus ready output indicator
      5. 8.3.5 Powered-off high impedance for I2C and I/O pins
      6. 8.3.6 Supports clock stretching and arbitration
    4. 8.4 Device Functional Modes
      1. 8.4.1 Start-up and precharge
      2. 8.4.2 Bus idle
      3. 8.4.3 Bus active
  9. 9 Application Information Disclaimer
    1. 9.1 Application Information
    2. 9.2 Typical Application
      1. 9.2.1 Design Requirements
        1. 9.2.1.1 Series connections
        2. 9.2.1.2 Multiple connections to a common node
        3. 9.2.1.3 Propagation delays
      2. 9.2.2 Detailed Design Procedure
      3. 9.2.3 Application Curves
    3. 9.3 Typical Application on a Backplane
      1. 9.3.1 Design Requirements
      2. 9.3.2 Detailed Design Procedure
  10. 10Power Supply Recommendations
    1. 10.1 Power Supply Best Practices
    2. 10.2 Power-on Reset Requirements
  11. 11Layout
    1. 11.1 Layout Guidelines
    2. 11.2 Layout Example
  12. 12Device and Documentation Support
    1. 12.1 Receiving Notification of Documentation Updates
    2. 12.2 Support Resources
    3. 12.3 Trademarks
    4. 12.4 Electrostatic Discharge Caution
    5. 12.5 Glossary
  13. 13Mechanical, Packaging, and Orderable Information

Package Options

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

8.4.1 Start-up and precharge

When the TCA9511A first receives power on the VCC pin, either during power-up or during live insertion, it starts in an under voltage lockout (UVLO) state, ignoring any activity on the SDA and SCL pins until VCC rises above UVLO.

Once the ENABLE pin goes high, the ‘Stop Bit and Bus Idle’ detect circuit is enabled and the device enters the bus idle state.

When VCC rises above UVLO, the precharge circuitry will activate, which biases the bus pins on both sides to about 1 V through an internal 100 kΩ resistor.