Multiplexer function check: is a multiplexer (MUX) a device that generates a fixed sequence of binary states on each clock pulse, regardless of its data inputs?

Introduction / Context:
A multiplexer is often called a “data selector.” It forwards one of several input lines to a single output based on select inputs. This question tests whether a MUX inherently produces a fixed output sequence on each clock pulse, which would actually describe a counter or sequence generator, not a MUX.

Given Data / Assumptions:

• Standard n-to-1 MUX with data inputs D0…Dn−1 and select lines S.
• No internal clocked memory in a simple combinational MUX.
• Any clocking pertains to external logic driving the select lines, not the MUX core.

Concept / Approach:
A MUX is purely combinational: Output Y = Dk where k is the index set by S. If a clock drives the select lines through a counter, the observed output may change in a pattern—but the MUX itself is not the sequence generator. The “fixed sequence on each clock” description fits counters or shift registers, not multiplexers.

Step-by-Step Solution:

Verification / Alternative check:
Datasheets for basic MUX ICs (e.g., 74HC151) list propagation delay and truth table only—no clock, no internal state.

Why Other Options Are Wrong:
Applies: misidentifies the device function.
“Only if select lines are clocked”: even then, the pattern comes from the external counter, not from the MUX.

Common Pitfalls:
Assuming “clocked” equals “sequential”; forgetting a MUX is combinational.

Final Answer:
Does not apply