ZHCS352D August   2011  – April 2021 TCA9509

PRODUCTION DATA  

  1. 1 特性
  2. 2 应用
  3. 3 说明
  4. 4 Revision History
  5. 5 Description (continued)
  6. 6 Pin Configuration and Functions
  7. 7 Specifications
    1. 7.1 Absolute Maximum Ratings
    2. 7.2 ESD Ratings
    3. 7.3 Recommended Operating Conditions
    4. 7.4 Thermal Information
    5. 7.5 Electrical Characteristics
    6. 7.6 Timing Requirements
    7. 7.7 I2C Interface Timing Requirements
  8. 8 Parameter Measurement Information
  9. 9 Detailed Description
    1. 9.1 Overview
    2. 9.2 Functional Block Diagram
    3. 9.3 Feature Description
      1. 9.3.1 Two-Channel Bidirectional Buffer
      2. 9.3.2 Integrated A-Side Current Source
      3. 9.3.3 Standard Mode and Fast Mode Support
    4. 9.4 Device Functional Modes
  10. 10Application and Implementation
    1. 10.1 Application Information
    2. 10.2 Typical Application
      1. 10.2.1 Design Requirements
      2. 10.2.2 Detailed Design Procedure
        1. 10.2.2.1 Clock Stretching Support
        2. 10.2.2.2 VILC and Pulldown Strength Requirements
  11. 11Power Supply Recommendations
  12. 12Layout
    1. 12.1 Layout Guidelines
    2. 12.2 Layout Example
  13. 13Device and Documentation Support
    1. 13.1 接收文档更新通知
    2. 13.2 支持资源
    3. 13.3 Trademarks
    4. 13.4 静电放电警告
    5. 13.5 术语表

封装选项

机械数据 (封装 | 引脚)
散热焊盘机械数据 (封装 | 引脚)
订购信息

11 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.