SCDA055 December   2024 SN74CB3Q16210

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
  5. 2Electrical Protection Definitions
    1. 2.1 Level 0 Isolation
    2. 2.2 Level 1 Isolation
    3. 2.3 Level 2 Isolation – Also Known as Hot-Insertion
    4. 2.4 Level 3 Isolation – Also Known as Live-Insertion
  6. 3Isolation Requirements Features
    1. 3.1 Ioff
    2. 3.2 Partial-Power-Down Mode
    3. 3.3 Hot Swapping or Insertion With Multiplexers
    4. 3.4 Hot-Insertion Hero Devices – Up to Level 2 Isolation Support
  7. 4Summary
  8. 5References

1 Introduction

High-speed data systems continue to drive faster data rates and are expected to support an extremely wide variety of system features, while the levels of reliability they are expected to meet also continue to increase. One of the most common strategies for keeping a system running continuously is live-insertion (also known as hot plugging or insertion or hot swapping). Live-insertion continues to be more prevalent within state-of-the-art systems, however, establishing a high reliability rating for such a system is not easy.

Live-insertion systems require additional care during design to make sure that signal-integrity levels remain acceptable throughout an operating system. In addition to signal-integrity concerns, hot-inserted cards can have adverse effects on other devices, which are caused by quickly changing voltage levels and damaging current flow. Protective components, such as a multiplexer with isolation features can reduce the risks associated with line-insertion operations, as seen in Figure 1-1.

Using a Multiplexer in Hot-Insertion Application Figure 1-1 Using a Multiplexer in Hot-Insertion Application