JAJST62 February   2024 SN74AVCH4T245-Q1

ADVANCE INFORMATION  

  1.   1
  2. 1 特長
  3. 2 アプリケーション
  4. 3 概要
  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  Switching Characteristics, VCCA = 1.2V ± 0.12V
    7. 5.7  Switching Characteristics, VCCA = 1.5V ± 0.1V
    8. 5.8  Switching Characteristics, VCCA = 1.8V ± 0.15V
    9. 5.9  Switching Characteristics, VCCA = 2.5V ± 0.2V
    10. 5.10 Switching Characteristics, VCCA = 3.3V ± 0.3V
    11. 5.11 Operating Characteristics
    12. 5.12 Typical Characteristics
  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 Fully Configurable Dual-Rail Design
      2. 7.3.2 Supports High Speed Translation
      3. 7.3.3 Ioff Supports Partial-Power-Down Mode Operation
      4. 7.3.4 Bus-Hold Circuitry
      5. 7.3.5 Vcc Isolation Feature
    4. 7.4 Device Functional Modes
  9.   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
      3. 8.2.3 Application Curve
    3. 8.3 Power Supply Recommendations
    4. 8.4 Layout
      1. 8.4.1 Layout Guidelines
      2. 8.4.2 Layout Example
  10. 8 Device and Documentation Support
    1. 8.1 Documentation Support
      1. 8.1.1 Related Documentation
    2. 8.2 ドキュメントの更新通知を受け取る方法
    3. 8.3 サポート・リソース
    4. 8.4 Trademarks
    5. 8.5 静電気放電に関する注意事項
    6. 8.6 用語集
  11. 9 Revision History
  12. 10Mechanical, Packaging, and Orderable Information
    1. 10.1 Tape and Reel Information
    2. 10.2 Mechanical Data

パッケージ・オプション

メカニカル・データ（パッケージ｜ピン）
サーマルパッド・メカニカル・データ
発注情報

8.3 Power Supply Recommendations

The SN74AVCH4T245-Q1 device uses two separate configurable power-supply rails, VCCA and VCCB. VCCA accepts any supply voltage from 1.08V to 3.6V, and VCCB accepts any supply voltage from 1.08V to 3.6V. The A port and B port are designed to track VCCA and VCCB respectively allowing for low voltage bidirectional translation between any of the 1.2-V, 1.5-V, 1.8-V, 2.5-V, and 3.3-V voltage nodes.

The output-enable (OE) input circuit is designed so that it is supplied by VCCA, and all outputs are placed in the high-impedance state when the OE input is high. To put the outputs in the high-impedance state during power up or power down, the OE input pin must be tied to VCCA through a pull-up resistor and must not be enabled until VCCA and VCCB are fully ramped and stable. The current-sinking capability of the driver determines the minimum value of the pull-up resistor to VCCA.

VCCA or VCCB can be powered up first. If the SN74AVCH4T245-Q1 is powered up in a permanently enabled state, pull-up resistors are recommended at the input. This allows for proper or glitch-free power-up. For more information, refer to Designing with SN74LVCXT245 and SN74LVCHXT245 Family of Direction Controlled Voltage Translators/Level-Shifters application note.