JAJSTH9U January   1993  – March 2024 SN54LVC08A , SN74LVC08A

PRODUCTION DATA  

  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, SN54LVC08A
    4. 5.4  Recommended Operating Conditions, SN74LVC08A
    5. 5.5  Thermal Information
    6. 5.6  Electrical Characteristics, SN54LVC08A
    7. 5.7  Electrical Characteristics, SN74LVC08A
    8. 5.8  Switching Characteristics, SN54LVC08A
    9. 5.9  Switching Characteristics, SN74LVC08A
    10. 5.10 Operating Characteristics
    11. 5.11 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 Balanced High-Drive CMOS Push-Pull Outputs
      2. 7.3.2 Standard CMOS Inputs
      3. 7.3.3 Clamp Diodes
      4. 7.3.4 Over-voltage Tolerant Inputs
    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
      3. 8.2.3 Application Curves
    3.     Power Supply Recommendations
    4. 8.3 Layout
      1. 8.3.1 Layout Guidelines
      2. 8.3.2 Layout Examples
  10. 9 Device and Documentation Support
    1. 9.1 Documentation Support (Analog)
      1. 9.1.1 Related Documentation
      2. 9.1.2 Related Links
    2. 9.2 Receiving Notification of Documentation Updates
    3. 9.3 サポート・リソース
      1. 9.3.1 Community Resources
    4. 9.4 Trademarks
    5. 9.5 静電気放電に関する注意事項
    6. 9.6 用語集
  11. 10Revision History
  12. 11Mechanical, Packaging, and Orderable Information

パッケージ・オプション

デバイスごとのパッケージ図は、PDF版データシートをご参照ください。

メカニカル・データ（パッケージ｜ピン）
  • D|14
  • RGY|14
  • DB|14
  • PW|14
  • BQA|14
  • NS|14
サーマルパッド・メカニカル・データ
発注情報

8.3.1 Layout Guidelines

When using multiple bit logic devices, inputs should not float. In many cases, functions or parts of functions of digital logic devices are unused. Some examples are when only two inputs of a triple-input AND gate are used, or when only 3 of the 4-buffer gates are used. Such input pins should not be left unconnected because the undefined voltages at the outside connections result in undefined operational states.

Specified in Figure 8-4 are rules that must be observed under all circumstances. All unused inputs of digital logic devices must be connected to a high or low bias to prevent them from floating. The logic level that should be applied to any particular unused input depends on the function of the device. Generally they will be tied to GND or VCC, whichever makes more sense or is more convenient.

Even low data rate digital signals can have high frequency signal components due to fast edge rates. When a PCB trace turns a corner at a 90° angle, a reflection can occur. A reflection occurs primarily because of the change of width of the trace. At the apex of the turn, the trace width increases to 1.414 times the width. This increase upsets the transmission-line characteristics, especially the distributed capacitance and self–inductance of the trace which results in the reflection. Not all PCB traces can be straight and therefore some traces must turn corners. Figure 8-5 shows progressively better techniques of rounding corners. Only the last example (BEST) maintains constant trace width and minimizes reflections.