What is the function of Power Clamp?

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wccheng

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Dear all,

It is my first time to use ESD pad. Based on the Design rule, it recommends us to put a power clamp between the VDD and GND pad. Could anyone tell me what is the function of this power clamp?

Thanks

wccheng
 

When ESD voltage exceeds breakdown voltage of the power clamp, it will discharge electrostatic.
 

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