Patent ID: 7512017

Claim:
An apparatus comprising: a first diffusion formed on a substrate, the first diffusion including a pair of channels, each of which separates a source from a drain; a second diffusion formed on the substrate, the second diffusion including a channel that separates a source from a drain; a first gate electrode formed on the substrate, wherein the first gate electrode overlaps one of the pair of channels on the first diffusion to form a first pass-gate transistor; a second gate electrode formed on the substrate, wherein the second gate electrode overlaps one of the pair of channels of the first diffusion to form a first pull-down transistor and overlaps the channel of the second diffusion to form a first pull-up transistor, and wherein the pass-gate, pull-down and pull-up transistors are of at least two different constructions; a third diffusion formed on the substrate, the third diffusion including a channel that separates a source from a drain; a fourth diffusion formed on the substrate, the fourth diffusion including therein a pair of channels, each channel separating a source from a drain; a third gate electrode formed on the substrate, wherein the third gate electrode overlaps one of the pair of channels on the fourth diffusion to form a second pass-gate transistor; and a fourth gate electrode formed on the substrate, wherein the fourth gate electrode overlaps one of the pair of channels of the fourth diffusion to form a second pull-down transistor and overlaps the channel of the third diffusion to form a second pull-up transistor, and wherein the second pass-gate, pull-down and pull-up transistors are of at least two different constructions.