Sequential Logic Circuit and Memory

Question 1

PLA is Combinational Circuit or Sequential Circuit?

Answer 1

Combinational

Question 2

RAM and ROM are Combinational Circuit or Sequential Circuit?

Answer 2

Sequential

Question 3

Truth Table of SR flip flop

Answer 3

S = 1 R = 0 -> Set(1)
S = 0 R = 1 -> Reset(0)
both 0 = memory
both 1 = invalid

Question 4

Truth Table of D flip flop

Answer 4

D = 0 -> Reset(0)
D = 1 -> Set(1)
Clk = 0 -> Memory

Question 5

Truth Table for JK flip flop

Answer 5

J = K = 0 -> memory (Qn)
J = K = 1 -> Compliment (Qn’)
J = 0, K = 1 -> reset (0)
J = 1, K = 0 -> Set (1)