Sequential Logic

Question 1

What are Combinational Logic Circuits?

Answer 1

Their outputs are formed from some combination of their present inputs

Question 2

What are Sequential circuits?

Answer 2

Their outputs depend upon the past history of their inputs

Question 3

What is the difference between combinational and sequential circuits?

Answer 3

Combinational circuits do not have any memory. Sequential circuits exhibit memory properties

Question 4

Describe a basic bistable circuit

Answer 4

• Uses positive feedback from output to input
• The input signal is inverted twice and fed back to the output
• This makes the circuit have two stable states: X high and Y low or X low and Y high