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A safety-related product to IEC 61508 needs a microcontroller with

  • A.a package with more pins than the design strictly needs
  • B.a second crystal for redundant timekeeping
  • C.documented diagnostic coverage and a safety manual from the vendor
  • D.the highest available clock frequency in its family

Answer: C

The certification requires evidence about the part's failure modes and the diagnostics that detect them, which only the vendor can supply. Parts sold for such use come with a safety manual and often with a self-test library.

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