JAJSH83E June   2014  – April 2019 SN65HVD1470 , SN65HVD1471 , SN65HVD1473 , SN65HVD1474 , SN65HVD1476 , SN65HVD1477

PRODUCTION DATA.  

  1. 1 特長
  2. 2 アプリケーション
  3. 3 概要
    1.     Device Images
      1.      ブロック図
  4. 4 改訂履歴
  5. 5 Device Comparison Table
  6. 6 Pin Configuration and Functions
    1.     Pin Functions — SOIC-8 and MSOP-8
    2.     Pin Functions — MSOP–10
    3.     Pin Functions — SOIC-14
  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 — D Packages
    5. 7.5  Thermal Information — DGS and DGK Packages
    6. 7.6  Power Dissipation
    7. 7.7  Electrical Characteristics
    8. 7.8  Switching Characteristics — 400 kbps
    9. 7.9  Switching Characteristics — 20 Mbps
    10. 7.10 Switching Characteristics — 50 Mbps
    11. 7.11 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
    4. 9.4 Device Functional Modes
      1. 9.4.1 Equivalent Circuits
  10. 10Application and Implementation
    1. 10.1 Application Information
    2. 10.2 Typical Application
      1.      Master Enable Control
      2.      Slave Enable Control
      3. 10.2.1 Design Requirements
        1. 10.2.1.1 Data Rate and Bus Length
        2. 10.2.1.2 Stub Length
        3. 10.2.1.3 Bus Loading
        4. 10.2.1.4 Receiver Failsafe
        5. 10.2.1.5 Transient Protection
      4. 10.2.2 Detailed Design Procedure
      5. 10.2.3 Application Curves
  11. 11Power Supply Recommendations
  12. 12Layout
    1. 12.1 Layout Guidelines
    2. 12.2 Layout Example
  13. 13デバイスおよびドキュメントのサポート
    1. 13.1 デバイス・サポート
      1. 13.1.1 デベロッパー・ネットワークの製品に関する免責事項
    2. 13.2 関連リンク
    3. 13.3 ドキュメントの更新通知を受け取る方法
    4. 13.4 コミュニティ・リソース
    5. 13.5 商標
    6. 13.6 静電気放電に関する注意事項
    7. 13.7 Glossary
  14. 14メカニカル、パッケージ、および注文情報

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

10.2.1.2 Stub Length

When connecting a node to the bus, the distance between the transceiver inputs and the cable trunk, known as the stub, should be as short as possible. Stubs present a non-terminated piece of bus line which can introduce reflections as the length of the stub increases. As a general guideline, the electrical length, or round-trip delay, of a stub should be less than one-tenth of the rise time of the driver, thus giving a maximum physical stub length as shown in Equation 1.

Equation 1. L(STUB) ≤ 0.1 × tr × v × c

where

  • tr is the 10/90 rise time of the driver
  • v is the signal velocity of the cable or trace as a factor of c
  • c is the speed of light (3 × 108 m/s)

Per Equation 1, Table 5 lists the maximum cable-stub lengths for the minimum-driver output rise-times of the SN65HVD147x full-duplex family of transceivers for a signal velocity of 78%.

Table 5. Maximum Stub Length

DEVICE MINIMUM DRIVER OUTPUT RISE TIME (ns) MAXIMUM STUB LENGTH
(m) (ft)
SN65HVD1470 100 2.34 7.7
SN65HVD1471 100 2.34 7.7
SN65HVD1473 4 0.1 0.3
SN65HVD1474 4 0.1 0.3
SN65HVD1476 2 0.05 0.15
SN65HVD1477 2 0.05 0.15