Patent ID: 6208557
Filing Date: 2001-03-27
Classification: G11C,H01L

Abstract:
A memory cell formed in a semiconductor material of a first conductivity type, the memory cell comprising:a source region of a second conductivity type formed in the semiconductor material;a drain region of the second conductivity type formed in the semiconductor material;a channel region defined in the material between the source and drain regions, the channel region having a first region, a second region, and a third region;a first isolation layer formed on the semiconductor material over the channel region;a non-conductive layer formed on the first isolation layer, the non-conductive layer having a material not found in the first isolation layer, the non-conductive layer trapping a first number of electrons when the memory cell is programmed, and a second number of electrons when the memory cell is unprogrammed, the first number being different from the second number;a second isolation layer formed on the nonconductive layer;a first gate formed on the second isolation layer over the first channel region;an isolation region formed on the second isolation layer over the second channel region; anda second gate formed on the second isolation layer over the third channel region.