Patent ID: 6847084
Filing Date: 2005-01-25
Classification: H01L

Abstract:
1. A semiconductor device comprising: a semiconductor substrate; a first circuit formed on the semiconductor substrate, the first circuit including first and second field-effect transistors, the first field-effect transistor comprising: the second field-effect transistor comprising: the first drain region of the first field-effect transistor accompanying a first load capacitance, the second drain region of the second field-effect transistor accompanying a second load capacitance which is smaller than the first load capacitance, and the first gate insulation film of the first field-effect transistor having an average relative dielectric constant higher than that of the second gate insulation film of the second field-effect transistor, and a second circuit coupled to the first circuit as an input/output portion of the first circuit and powered by a voltage higher than that for the first circuit.