SNOAA91 may   2023 TLV1812 , TLV1851 , TLV7011

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
  5. 2Input Types
    1. 2.1 Classic Bipolar Inputs
    2. 2.2 ESD Protected Inputs
    3. 2.3 "Fail-Safe" and "Fault Tolerant" Inputs
      1. 2.3.1 LM339 Family - The Original "Fail-Safe" Input
      2. 2.3.2 Modern "Fail-Safe" Inputs
    4. 2.4 "Over-the-Rail" Inputs
  6. 3Identifying The Difference Between The Input Types
    1. 3.1 Older Bipolar Device Inputs
    2. 3.2 Identifying ESD Clamped Inputs
    3. 3.3 Identifying "Failsafe" or "Over-The-Rail" Inputs
  7. 4Precautions for "Failsafe" and "Over-The-Rail" Inputs
  8. 5Negative Input Voltages
  9. 6Input Types Comparison Table
  10. 7Summary
  11. 8References

3.2 Identifying ESD Clamped Inputs

If the Absolute Maximum Ratings upper input voltage is referenced to the supply, such as "V+" or "Vcc + 0.2", then that is a good sign that there is an upper ESD clamp. Excursions outside the supplies need to be limited to prevent the ESD diodes from conducting (typically around 500 mV - 600 mV depending on process).

GUID-20230215-SS0I-WBXT-XPFX-LWMCBZGMRHX8-low.svg Figure 3-2 Example of TLV1812 Abs Max Table for ESD Clamped Inputs

Figure 3-2 from the TLV1812 data sheet Absolute Maximum Ratings table shows an example of the ESD clamped inputs. Notice that the highlighted "Input Pins" row shows a Max of "(V+) + 0.3", which is referred to the V+ power supply rail.