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  • TCA9802 电平转换 I2C 总线缓冲器/中继器

    • ZHCSG41B March   2017  – February 2020 TCA9802

      PRODUCTION DATA.  

  • CONTENTS
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  • TCA9802 电平转换 I2C 总线缓冲器/中继器
  1. 1 特性
  2. 2 应用
  3. 3 说明
    1.     Device Images
      1.      简化原理图
  4. 4 修订历史记录
  5. 5 Device Comparison Table
  6. 6 Pin Configuration and Functions
    1.     Pin 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 Switching Characteristics
    8. 7.8 Typical Characteristics
  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 Integrated Current Source
      2. 9.3.2 Ultra-Low Power Consumption
      3. 9.3.3 No Static-Voltage Offset
      4. 9.3.4 Active-High Repeater Enable Input
      5. 9.3.5 Powered Off High Impedance I2C Bus Pins on A-Side
      6. 9.3.6 Powered-Off Back-Power Protection for I2C Bus Pins
      7. 9.3.7 Clock Stretching and Multiple Master Arbitration Support
    4. 9.4 Device Functional Modes
      1. 9.4.1 Device Operation Considerations
        1. 9.4.1.1 B-Side Input Low (VIL/IILC/RILC)
          1. 9.4.1.1.1 VILC & IILC
          2. 9.4.1.1.2 RILC
        2. 9.4.1.2 Input and Output Leakage Current (IEXT-I/IEXT-O)
          1. 9.4.1.2.1 IEXT-I
          2. 9.4.1.2.2 IEXT-O
  10. 10Application and Implementation
    1. 10.1 Application Information
      1. 10.1.1 Device Selection Guide
      2. 10.1.2 Special Considerations for the B-side
        1. 10.1.2.1 FET or Pass-Gate Translators
        2. 10.1.2.2 Buffered Translators/Level-shifters
    2. 10.2 Typical Application
      1. 10.2.1 Single Device
        1. 10.2.1.1 Design Requirements
        2. 10.2.1.2 Detailed Design Procedure
        3. 10.2.1.3 Application Curves
      2. 10.2.2 Buffering Without Level-Shifting
        1. 10.2.2.1 Design Requirements
        2. 10.2.2.2 Detailed Design Procedure
        3. 10.2.2.3 Application Curve
      3. 10.2.3 Parallel Device Use Case
        1. 10.2.3.1 Design Requirements
        2. 10.2.3.2 Detailed Design Procedure
        3. 10.2.3.3 Application Curves
      4. 10.2.4 Series Device Use Case
        1. 10.2.4.1 Design Requirements
        2. 10.2.4.2 Detailed Design Procedure
        3. 10.2.4.3 Application Curve
  11. 11Power Supply Recommendations
  12. 12Layout
    1. 12.1 Layout Guidelines
    2. 12.2 Layout Example
  13. 13器件和文档支持
    1. 13.1 文档支持
    2. 13.2 接收文档更新通知
    3. 13.3 支持资源
    4. 13.4 商标
    5. 13.5 静电放电警告
    6. 13.6 Glossary
  14. 14机械、封装和可订购信息
  15. 重要声明
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DATA SHEET

TCA9802 电平转换 I2C 总线缓冲器/中继器

本资源的原文使用英文撰写。 为方便起见，TI 提供了译文；由于翻译过程中可能使用了自动化工具，TI 不保证译文的准确性。 为确认准确性，请务必访问 ti.com 参考最新的英文版本（控制文档）。

1 特性

  • 双通道双向缓冲器
  • 在 B 侧集成了电流源，不需要外部 B 侧电阻器
  • 超低功耗
  • 无静态电压偏移，低 VOL
  • 与 I2C 总线和 SMBus 兼容
  • 在 A 侧上，工作电源电压范围为 0.8V 至 3.6V
  • 在 B 侧上，工作电源电压范围为 1.65V 至 3.6V
  • 高电平有效中继器使能输入
  • A 侧断电高阻抗 I2C 总线引脚
  • 断电反射功率保护 I2C 总线引脚
  • 支持时钟拉伸和多主仲裁
  • 0.5mA 至 3mA 的电流源选项系列

2 应用

  • 服务器
  • 路由器（路由设备）
  • 工业设备
  • 个人计算机
  • 功耗敏感型 应用

3 说明

TCA9802 是一款适用于 I2C 总线和 SMBus/PMBus 系统的双通道双向缓冲器。它在低电压（低至 0.8V）和较高电压（1.65V 至 3.6V）之间提供双向电平转换。TCA9802 在器件 B 侧 具有 一个内部电流源，因而 B 侧不需要外部上拉电阻器。该电流源还提供改进的上升时间和超低功耗。

TCA9802 能够在不使用静态电压偏移或增量偏移的情况下提供真正的缓冲（而不是 pass-FET 解决方案）。这意味着 TCA9802 的 A 侧和 B 侧上的 VOL 极低（约为 0.2V），有助于消除由于固定的 VIL 阈值导致的通信问题。TCA9802 的另一个重要特性是没有电源定序要求或电源依赖性。VCCA 可以大于、小于或等于 VCCB。这使得系统设计人员可以灵活地使用 TCA9802。

TCA9802 是由四种器件组成的产品系列中的一部分，每种器件有不同的电流源强度（请参见器件比较表）。

器件信息(1)

器件型号 封装 封装尺寸（标称值）
TCA9802 VSSOP (8) 3.00mm × 3.00mm
  1. 如需了解所有可用封装，请参阅数据表末尾的可订购产品附录。

器件比较

器件型号 ICS：电流源值（典型值）
TCA9800 0.54mA
TCA9801 1.1mA
TCA9802 2.2mA
TCA9803 3.3mA

Device Images

简化原理图

TCA9802 MainGraphic9802.gif

4 修订历史记录

Changes from A Revision (March 2017) to B Revision

  • Added last sentence: "When enable is a logic LOW while VCCB is powered on, the internal current source on B side is still enabled...." to the Active-High Repeater Enable Input sectionGo

Changes from * Revision (March 2017) to A Revision

  • Updated ICS typical values in Device Comparison TableGo

5 Device Comparison Table

Part Number ICS: Current Source Value (Typical)
TCA9800 0.54 mA
TCA9801 1.1 mA
TCA9802 2.2 mA
TCA9803 3.3 mA

6 Pin Configuration and Functions

DGK Package
8-Pin VSSOP
Top View

Pin Functions

PIN TYPE DESCRIPTION
NO. NAME
1 VCCA Supply A-side supply voltage (0.8 V to 3.6 V)
2 SCLA I/O Serial clock bus, A-side. Connect to VCCA through a pull-up resistor, even if unused
3 SDAA I/O Serial data bus, A-side. Connect to VCCA through a pull-up resistor, even if unused
4 GND — Ground
5 EN I Active-high repeater enable input, referenced to VCCA
6 SDAB I/O Serial data bus, B-side. Do NOT connect to VCCB through a pull-up resistor for proper operation. If unused, leave floating
7 SCLB I/O Serial clock bus, B-side. Do NOT connect to VCCB through a pull-up resistor for proper operation. If unused, leave floating
8 VCCB Supply B-side and device supply voltage (1.65 V to 3.6 V)

7 Specifications

7.1 Absolute Maximum Ratings

over operating free-air temperature range (unless otherwise noted)(1)
MIN MAX UNIT
VCCA Supply voltage on A-side –0.5 4 V
VCCB Supply voltage on B-side –0.5 4 V
VEN Enable input voltage –0.5 4 V
VI/O I2C bus voltage –0.5 4 V
IOL Maximum SDAA, SCLA IOL current 20 mA
IIK Input clamp current (SDAB/SCLB) –20 mA
Input clamp current (EN, VCCA, VCCB, SDAA, SCLA) –20 mA
IOK Output clamp current (SDAB/SCLB) –20 mA
Output clamp current (EN, VCCA, VCCB, SDAA, SCLA) –20 mA
Operating junction temperature TJ 130 °C
Storage temperature Tstg –60 150 °C
(1) Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only and functional operation of the device at these or any other conditions beyond those indicated under Recommended Operating Conditions is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.

 
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