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

2.3 Level 2 Isolation – Also Known as Hot-Insertion

A device that supports hot insertion (level 2 isolation) prevents driver conflict during card insertion or removal. In addition to the level 1 isolation capabilities, the device remains in the high-impedance state from a power-supply voltage of 0V to a specified voltage. Data along the active bus can be corrupted during insertion or removal in accordance to level 2 isolation compliance. Ioff circuitry is required, as well as partial-power-down mode.