OBJECTIVE

We learnt in Chapter 14 the basic memory section elements SR, D, JK and T flip flops. A D flip flop registers at the Q output the bit at D input. This fact can be used to design the multi-bit registers. JK flip-flop, when both J and K equal 1, and T flip flop toggles the Q output on each excitation. This fact can be used to design a divide-by-two element and a multi-bit counter.

We learnt the circuit implementation concepts for the clocked sequential circuits in Chapter 15. Using these, we design a large number of useful circuits, for example, for registers and counters.

We will learn the designs of registers, shift registers, ripple and synchronous counters in this chapter. We will also learn their timing diagrams.