Demultiplexer behavior – does a demultiplexer take a single input signal and “turn it into a binary number,” or does it distribute that signal to one of many outputs based on select lines?

Introduction / Context:
The names “encoder,” “decoder,” “multiplexer,” and “demultiplexer” can be confusing. This question clarifies the specific function of a demultiplexer (DEMUX) and whether it performs numeric code generation from an input signal.

Given Data / Assumptions:

• DEMUX has one data input, multiple outputs, and select inputs.
• An encoder generates a binary number from one-of-N active inputs.
• A decoder translates a binary code into one-of-N outputs or display segments.

Concept / Approach:
A DEMUX routes a single input to one selected output among many, as determined by the select lines. It does not analyze the content of the input to produce a binary number; that function belongs to an encoder. Therefore, the claim that a DEMUX “turns an input into a binary number” is incorrect. Instead, a DEMUX is essentially the inverse of a multiplexer with respect to routing, not coding.

Step-by-Step Solution:

Verification / Alternative check:
Look at truth tables: 1-of-N DEMUX truth tables show output selection, while encoder truth tables map one-hot inputs to binary codes—two distinct behaviors.

Why Other Options Are Wrong:
“Correct” confuses DEMUX with encoder; references to “active-low” or specific device counts do not change the fundamental routing function.

Common Pitfalls:
Misapplying DEMUX in applications that require code generation or decoding; ensure you select the right primitive for the job.

Final Answer:
Incorrect