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Digital ElectronicsEncoders & Decoders

How many 2-to-4 decoders with enable inputs are minimally needed to construct a 3-to-8 decoder using a straightforward hierarchical arrangement?

  • A1
  • B2
  • C3
  • D4
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Correct Answer: B. 2
Explanation: The most significant input can enable one of two 2-to-4 decoders, while the remaining two inputs feed both decoders. Thus two decoders are sufficient.
Reference: Standard digital electronics: decoder expansion
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