Patent ID: 6528839
Filing Date: 2003-03-04
Classification: B82Y,G11C,H01L

Abstract:
A semiconductor integrated circuit device on a semiconductor substrate, comprising:a logic circuit; a nonvolatile memory; and an external input/output circuit wherein said nonvolatile memory comprises: a nonvolatile memory element which is constructed so as to be electrically programmable by a MIS transistor and a control gate; the MIS transistor having a source and a drain of a second conductivity type formed in a semiconductor region of a first conductivity type, a gate insulating film formed on a channel defined between the source and the drain, and a floating gate formed on the gate insulating film; the control gate being formed of a semiconductor region of a second conductivity type formed under an extension portion of the floating gate through another gate insulating film; and the gate insulating films of the nonvolatile memory element, and a gate insulating film of a MIS transistor included in the external input/output circuit have substantially equal thicknesses.