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

2.2 Level 1 Isolation

A device with level 1 isolation prevents damage to the device by limiting the current transfer between an energized bus and the device input and output when powered down (Vcc = 0V). This static-current limitation allows insertion or removal without interrupting the host system power. However, the host system must suspend signaling during insertion or removal. Ioff circuitry is required for this level of isolation.