Logic Gates Definitions Flashcards
(20 cards)
Combinational Circuit
A logic circuit whose output depends only on the current inputs.
Sequential Circuit
A logic circuit whose output depends on both current inputs and past inputs (i.e., history).
Examples of Combinational Circuits
Adders, Subtractors, Multiplexers, Demultiplexers, Encoders, Decoders
Basic Building Block of Sequential Circuits
Flip-Flops (e.g., SR, D, T, JK)
Clock Signal
Used in sequential circuits to synchronize changes in state.
How does combinational circuit output behave
Changes instantly with input change.
Sequential Circuit Output
May change on a clock edge due to memory elements.
What is a Moore Machine?
Output depends only on current state.
What is a Mealy Machine
Output depends on current state and input.
Which circuit type has feedback?
Sequential circuits
What is a Flip-Flop
A bistable device used to store 1 bit of data.
State Diagram
Graphical representation of states and transitions in sequential circuits.
Truth Table
Used in combinational circuits to show input-output mapping.
Timing Diagram
Used in sequential circuits to show signal behavior over time. Shows a graphical representation of clock and all other input signals
Can a combinational circuit remember past inputs?
No, it has no memory.
Which circuits are memoryless and react instantly to input changes?
Combinational Circuits
Which machine can respond faster to input changes: Mealy or Moore?
Mealy Machine
What kind of diagram represents state transitions in a sequential circuit?
State Diagram
What’s the key feature that distinguishes sequential circuits from combinational ones?
They have memory and feedback.
Which type of logic circuit uses feedback loops?
Sequential Circuits
