Mumbai University > COMPS > Sem 3 > Digital Logic Design and Analysis

Marks: 5 M

Year: Dec 2013

1) Logic Diagram:

2) Timing Diagram:

3) Working:

• Assume initially $Q_0, Q_1, Q_2, Q_3 = 0001$. As soon as first clock pulse is applied, as per nature of D F/F the output follows the input. Therefore $Q_0 Q_1 Q_2 Q_3 = 1000$.

• After the second clock pulse $Q_0 Q_1 Q_2 Q_3 = 0100$

• After the third clock pulse $Q_0 Q_1 Q_2 Q_3 = 0010$
• After the fourth clock pulse $Q_0 Q_1 Q_2 Q_3 = 0001$
• In this way, data keeps on rotating in ring fashion so it is called Ring Counter.