Design of counters using reversible logic

Now-a-days, the reversible logic design attracts more interest due to its low power consumption. A lot of research has been done in combinational as well as sequential design of reversible circuits. In this paper we have proposed a reversible T-Flip-flop which is better than the existing designs in the literature. A novel design of reversible asynchronous and synchronous counters is also proposed in this paper. As far as it is known, this is the first attempt to apply reversible logic to the counter design. In this paper we have also proposed a new reversible gate which can be used as copying gate. We hope this paper will initiate a new area of research in the field of reversible sequential circuit.