An internal combustion engine provided with a variable compression ratio mechanism able to change a mechanical compression ratio and a variable valve timing mechanism able to control a closing timing of an intake valve. Specifically, the present invention provides an SRAM cell having one or more sets of stacked transistors for isolating the cell during a read operation. Design features can alternatively, or additionally, be introduced after optical proximity correction and asymmetrically relative to one or more parts of a reticle pattern.