Patent ID: 6638821
Filing Date: 2003-10-28
Classification: G11C,H01L

Abstract:
A multi-bit spit-gate (MSG) flash cell containing N+1 bits, having single bit and cell erasing functions comprising.a substrate having a surface region of first conductivity type; a first drain region and a second drain region formed in said surface region, said drain regions being of second conductivity type opposite from said one conductivity type; a first bit line contacting said first drain region; a second bit line contacting said second drain region; a plurality of (N+1) stacked gates, each comprising a floating gate and a control gate, where N is any integer; a plurality of N select gates disposed therebetween said stacked gates, wherein said stacked gates cooperating with said select gates form a means for erasing, and a word line contacting said plurality of N select gates; whereby a single bit is erased by applying a first potential to a selected control gate and said cell is erased by applying a second potential to said select gates.