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A design must survive an eight kilovolt electrostatic discharge to a connector pin. The microcontroller's own pin rating of two kilovolts means

  • A.the design cannot be built around that particular part at all, on any terms
  • B.the pin must be reconfigured as an input only
  • C.the rating applies to handling rather than to operation
  • D.external protection devices are required on that pin

Answer: D

A device rating covers handling in manufacture, not a discharge to the finished product's connector, and a transient suppressor and series resistance are what stand between the two. Every exposed connector needs that treatment whatever the part's own rating.

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