Patent ID: 6590266
Filing Date: 2003-07-08
Classification: H01L

Abstract:
A 2-bit mask ROM device, comprising:a substrate; a gate structure, disposed on a part on the substrate; a 2-bit code region, configured in the substrate beside both sides of the gate structure; at least a spacer, disposed on both sides of the gate structure; a buried drain region, configured in the substrate beside both sides of the spacer; a doped region, configured in the substrate between the buried drain region and the 2-bit code region, wherein a dopant type of the doped region is different from that of the 2-bit code region and a dopant concentration of the doped region is higher than a dopant concentration of the 2-bit code region; an insulation layer, disposed above the buried drain region; and a word line, disposed on a surface of the gate structure.