Abstract| An 8 x 8-b nRERL serial multiplier is implemented in a 0.6-m n-well 3-metal CMOS process. nRERL nMOS Reversible Energy Recovery Logic is a new reversible adiabatic logic circuit, which can be operated at the leakage-current level for ultralow-energy applications. Measurement results showed that the nRERL serial multiplier consumed only 0.9 of the energy dissipation of the static CMOS one at the operating frequency 100 kHz at 5V, where its adiabatic and leakage losses were about equal.