QUESTION 4 (a) There are two types of the sequential circuit which are synchronous and asynchronous. 0 Explain the differences between these two types of a sequential circuit. [2 marks] Active-low input SET-RESET(S-R) latch is an asynchronous sequential circuit. Draw the logic circuit using only NAND-gates and state the truth table for it. [4 marks) (b) By referring to Figure Q4(b)). draw the timing diagram for Q.Q.Q and Q. Note that the CLK signal is shown in Figure Q4b)). [12 marks] HIGH 13 14 PC PC PC PC PC Ko K K CLK Figure Q4(b)(i): 5 stages synchronous binary counter CLK Q Q Q: Figure Q4(b)(ii): Timing diagram