A conditional clocking flip-flop for low power H.264/MPEG-4 audio/visual codec LSI

A novel conditional clocking flip-flop is proposed. The flip-flop circuit does not consume any power when the data input of the flip-flop does not change its state. Taking the overhead of the auxiliary circuits into account, the flip-flop consumes less power than the conventional flip-flop when the data transition probability is less than 55%. By employing the conditional clocking flip-flop circuits in a mobile applications LSI, the power consumption is reduced by 8-31%.