Question

The device shown here is most likely to be _____ .

• A. 4\(\times\)1 Multiplexer
• B. 6\(\times\)1 Multiplexer
• C. 4\(\times\)1 Demultiplexer
• D. 6\(\times\)1 Demultiplexer

Hint:

Multiplexer (MUX) vs Demultiplexer (DEMUX). MUX: Many Inputs \(\rightarrow\) One Output (Data Selector). DEMUX: One Input \(\rightarrow\) Many Outputs (Data Distributor). An \(N \times 1\) MUX has N data inputs and \(\log_2 N\) select lines. A \(1 \times N\) DEMUX has N outputs and \(\log_2 N\) select lines.

Answer 1

The Correct Option is A

The diagram shows a digital logic device with multiple data inputs (D0, D1, D2, D3), select inputs (S0, S1), an enable input (EN), and a single output (Y)
- A Multiplexer (MUX) is a device that selects one of several input signals and forwards the selected input to a single output line
The selection is controlled by the select inputs
An \(N \times 1\) MUX has N data inputs, \(\log_2 N\) select lines, and 1 output
Here, we have 4 data inputs (N=4) and \(\log_2 4 = 2\) select inputs (S0, S1)
This matches the structure of a 4x1 Multiplexer
- A Demultiplexer (DEMUX) takes a single input signal and routes it to one of several output lines, based on the select inputs
It has 1 data input, \(\log_2 N\) select lines, and N outputs
This does not match the diagram
The enable input (EN) is common to both MUX and DEMUX, used to activate or deactivate the device
Given the multiple data inputs and single output controlled by select lines, the device is a 4x1 Multiplexer