Abstract
In this paper, a review of reversible logic-based sequential circuits is presented for low-power digital system design. Reversible logic eliminates information loss, thereby reducing energy dissipation in accordance with Landauer’s principle. The study covers fundamental reversible gates such as Feynman and Fredkin gates and analyzes key sequential components, including flip-flops, counters, and universal shift registers. The paper also discusses important performance parameters like quantum cost, garbage outputs, and circuit efficiency, along with their role in designing Reversible Arithmetic Logic Units (RALU) for applications in VLSI and quantum computing. Overall, the review highlights the potential of reversible logic for developing energy-efficient and scalable computing systems.