Define demultiplexing In digital logic, demultiplexing is the function that ________.

Difficulty: Easy

Correct Answer: switches logic from one input to any of several output lines

Explanation:


Introduction / Context:
Multiplexers (MUX) and demultiplexers (DEMUX) are fundamental routing elements in digital systems. Knowing the direction of signal selection—many-to-one versus one-to-many—is key when designing data paths, addressing memory banks, or steering control signals.


Given Data / Assumptions:

  • A multiplexer selects one of many inputs and forwards it to a single output.
  • A demultiplexer takes one input and routes it to one of many outputs.
  • Selection is controlled by binary select lines.


Concept / Approach:
Demultiplexing distributes a single input to multiple destinations based on select signals. Typical notation: 1-to-N. In contrast, multiplexing is N-to-1. Real devices may combine with latches or tristate drivers in buses; the core logical definition remains the same.


Step-by-Step Solution:

Clarify MUX vs. DEMUX directionality (N→1 vs. 1→N).Match “one input to several outputs” with demultiplexer behavior.Identify option describing this routing explicitly.Choose “switches logic from one input to any of several output lines.”


Verification / Alternative check:
Truth tables for 1-to-4 DEMUX show input D appearing at Y0–Y3 depending on select S1:S0, validating the definition.


Why Other Options Are Wrong:

  • Determines greatest input: This is a magnitude comparator task.
  • Several inputs onto one output: That is a multiplexer.
  • Converts a code: That is a decoder/encoder function.
  • Stores data: That is memory or a latch/flip-flop function.


Common Pitfalls:
Confusing DEMUX with decoder; although related, a DEMUX also forwards the data signal, not just asserts a single line.


Final Answer:
switches logic from one input to any of several output lines

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