Patent ID: 7235835

Claim:
A semiconductor device having a first region including a silicide layer and a second region without a silicide layer being formed, wherein a sidewall composed of a plurality of insulating films which includes a first, second, and third insulating layer formed as lower, middle, and upper layers is formed at a side of a gate electrode of a first field effect transistor formed in said first region and said silicide layer is also formed at a source/drain region of said first field effect transistor, and said second region includes a second field effect transistor and is covered by a plurality of insulating films which includes said first and second insulating layers, said second field effect transistor having a sidewall further comprised of said third upper insulating layer of said plurality of insulating films formed corresponding to a side of a gate electrode of said second field effect transistor such that said third upper insulating layer is formed exclusively as a sidewall of the gate electrode in said second region.