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Consider the following circuits: 1. Full adder 2. Half adder 3. JK flip-flop 4. Counter Which of the above circuits are classified as sequential logic circuits?

Consider the following circuits: 1. Full adder 2. Half adder 3. JK flip-flop 4. Counter Which of the above circuits are classified as sequential logic circuits? Correct Answer 3 and 4

Concept:

Combinational Circuits

Sequential Circuits

Its output is determined by the present values of its input only.

Its output is determined by the present input as well as past output values

It does not have a memory and feedback path from output to input

It has a memory element and a feedback path from output to input

Its circuit is simpler than that of a sequential circuit.

Its circuit is more complex than that of combinational circuits.

Ex: Adder, subtractor, multiplexer, de-multiplexer, decoder, encoder etc.

Ex: Latches, flip flops, counters, shift registers

 

 

 

 

 

 

 

 

 

 

 

Application:

1. A full adder is a combinational circuit as the output doesn’t depend on past output.

2. An half adder is a combinational circuit as the output doesn’t depend on past output.

3. J-K flip flop is a sequential circuit as the output depend on past output.

4. Counter is sequential circuit as the output depend on past output.

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