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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
 

leo_o2

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

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