Recognizing applications of digital multiplexers Which application correctly reflects a common, practical use of a digital multiplexer (data selector) in digital system design?

Introduction / Context:
A multiplexer (MUX) routes one of many inputs to a single output based on select signals. It is often called a “data selector.” This role is ubiquitous in digital systems for bus sharing, input selection, and time-division multiplexed display driving.

Given Data / Assumptions:

• Multiplexer has multiple data inputs, select lines, and one output.
• At any instant exactly one input is connected through to the output.
• We are not describing arithmetic or error-detection functions.

Concept / Approach:
The MUX’s primary use is selection of one input among many. Functions like serial-to-parallel conversion are typically performed by shift registers and demultiplexers, while parity checking uses XOR logic. Data generation suggests sources such as counters or LFSRs rather than a selector.

Step-by-Step Solution:

Verification / Alternative check:
Look up 74HC151 (8-to-1 data selector) or similar: datasheets explicitly label these ICs as “multiplexer/data selector.”

Why Other Options Are Wrong:

• Data generation: multiplexers select existing data, they do not generate new data.
• Serial-to-parallel conversion: primarily uses shift registers and demultiplexers.
• Parity checking: uses XOR/XNOR networks, not a selector.

Common Pitfalls:
Confusing multiplexers (many-to-one) with demultiplexers (one-to-many) and shift-register-based format converters.

Final Answer:
data selector