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As from the definition of ESD you can understand that uncontrollable current flows between source and drain which only stops when transistor breakdown happens . So that means ESD can destroy your whole chip.
This ESD is also known as Latchup.
so to overcome this we add filler cells which make the n-well continuous this means we get a continuous voltage inside our chip. and also it IO pads we include ESD protection circuit to take care of it.
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