SCPS225E August   2011  – October 2024 TCA9509

PRODUCTION DATA  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Pin Configuration and Functions
  6. 5 Specifications
    1. 5.1 Absolute Maximum Ratings
    2. 5.2 ESD Ratings
    3. 5.3 Recommended Operating Conditions
    4. 5.4 Thermal Information
    5. 5.5 Electrical Characteristics
    6. 5.6 Timing Requirements
    7. 5.7 I2C Interface Timing Requirements
  7. 6 Parameter Measurement Information
  8. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 Two-Channel Bidirectional Buffer
      2. 7.3.2 Integrated A-Side Current Source
      3. 7.3.3 Standard Mode and Fast Mode Support
    4. 7.4 Device Functional Modes
  9. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Application
      1. 8.2.1 Design Requirements
      2. 8.2.2 Detailed Design Procedure
        1. 8.2.2.1 Clock Stretching Support
        2. 8.2.2.2 VILC and Pulldown Strength Requirements
  10. 9 Power Supply Recommendations
  11. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Example
  12. 11Device and Documentation Support
    1. 11.1 Receiving Notification of Documentation Updates
    2. 11.2 Support Resources
    3. 11.3 Trademarks
    4. 11.4 Electrostatic Discharge Caution
    5. 11.5 Glossary
  13. 12Revision History
  14. 13Mechanical, Packaging, and Orderable Information
    1. 13.1 Tape and Reel Information

Package Options

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

9 Power Supply Recommendations

VCCB and VCCA can be applied in any sequence at power up. The TCA9509 includes a power-up circuit that keeps the output drivers turned off until VCCB is above 2.5 V and the VCCA is above 0.8 V. After power up and with the EN high, a low level on the B-side (below 0.3 × VCCB) turns the corresponding A-side driver (either SDA or SCL) on and drives the A-side down to approximately 0.2 V. When the B-side rises above 0.3 × VCCB, the A-side pull-down driver is turned off and the external pull-up resistor pulls the pin high. When the A-side falls first and goes below 0.3 × VCCA, the B-side driver is turned on and the B-side pulls down to 0 V. The A-side pull-down is not enabled unless the A-side voltage goes below 0.4 V. If the A-side low voltage does not go below 0.5 V, the B-side driver turns off when the A-side voltage is above 0.7 × VCCA. If the A-side low voltage goes below 0.4 V, the A-side pull-down driver is enabled, and the A-side is able to rise to only 0.5 V until the B-side rises above 0.3 × VCCB.

A 100 nF a decoupling capacitor should be placed as close to the VCCA and VCCB pins in order to provide proper filtering of supply noise.