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Digital ElectronicsEncoders & Decoders

A decoder with active-LOW outputs is enabled. What does selection of one output normally mean?

  • AThe selected output goes LOW while the others remain HIGH
  • BThe selected output goes HIGH while all others go LOW
  • CAll outputs become high impedance
  • DEvery output toggles continuously
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Correct Answer: A. The selected output goes LOW while the others remain HIGH
Explanation: For an active-LOW decoder, assertion is represented by logic 0, so the selected output is LOW and unselected outputs remain HIGH.
Reference: Standard digital electronics: active-low decoders
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