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An engineer reports that a part specified to 20 MHz is running reliably at 40 MHz on the bench. Shipping the design at 40 MHz would be

  • A.acceptable provided the temperature stays below 25 degrees
  • B.unwise, nothing outside the specification being guaranteed
  • C.acceptable, since the part demonstrably works
  • D.acceptable if the supply is raised to compensate

Answer: B

One sample working at double its rating says nothing about the next ten thousand across temperature and process spread, and raising the supply beyond its own maximum compounds the problem. The whole value of a specification is that it holds for every part.

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