Digital Systems: Principles and Design

Sequential Circuits for

Registers and Counters

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, ...