Is ESD cell and clamp cell the same?

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huckle

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Is ESD cell and clamp cell the same? From the name 'clamp', it seems it would clamp something to 1 or 0, what does it clamp?
 

Clamp (supply) cell is ESD protection cell also, but typically it is used at supply rails. It should clamp ESD spikes only (!) to safety levels. ESD protection cell should be included in every IO, and in general it clamps ESD spikes in some manner.
 
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