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There are ground pins on a microprocessor chip for the same reason there are ground pins on any kind of chip - to provide a current sink path for gates that need to pull to ground.

If you are asking why there are two ground pins on some processors such as the 8086/8088, the answer is that one ground pin is not enough - that if all gates pulled to ground at the same time, the current transient would destabilize the processor - so two were provided.

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14y ago

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