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

2.1 Level 0 Isolation

A device with level 0 isolation is incapable of being inserted safely into a backplane without first powering down the host power supply. The device does not have circuitry designed for protection against instantaneous current flow or sudden changes in voltage, and does not have the capability to enter the high-impedance state during a hot-swap event. Damage to the device and other components on the board are almost certain. Also, system glitches and loss of data-signal integrity can occur.