Logic circuits

Which correctly describes the function of a multiplexer?

  1. AIt stores the input value for one clock cycle
  2. BIt inverts the logic of the input signal
  3. CIt selects one of several inputs according to select signals and outputs it
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Answer: C. It selects one of several inputs according to select signals and outputs it

A multiplexer (selector) chooses one of several inputs according to the value of its select signals and passes it to the output. For example, with 2-bit select signals it can choose one of four inputs. A circuit that routes one input to one of several outputs is a demultiplexer.

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More Logic circuits questions

  1. What does a two-input NAND gate do when its two inputs are tied together to form a single input?
  2. What is the main use of a Karnaugh map?
  3. Which correctly describes the setup time of a flip-flop?
  4. How many states can a 4-bit binary counter represent?
  5. Which is a characteristic of Gray code?