Logic circuits

Which correctly describes a sequential circuit?

  1. AIts output depends on the current inputs and a stored internal state
  2. BIts output depends only on the current inputs
  3. CIt handles only analog signals
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Answer: A. Its output depends on the current inputs and a stored internal state

A sequential circuit has storage elements such as flip-flops, and its output depends not only on the current inputs but also on the history of past inputs (its internal state). Counters, registers and state machines are typical examples. A circuit whose output depends only on the current inputs is a combinational circuit.

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  2. What is the hexadecimal number FF in decimal?
  3. Which bit pattern represents −1 in 4-bit two's complement?
  4. Which correctly describes the function of a multiplexer?
  5. What does a two-input NAND gate do when its two inputs are tied together to form a single input?