Patent ID: 6501138
Filing Date: 2002-12-31
Classification: H01L,Y10S

Abstract:
A semiconductor memory device, comprising:a semiconductor substrate having a main surface; a well formed in the semiconductor substrate; a first memory cell region that is part of the main surface and located over the well; a second memory cell region that is part of the main surface and located over the well; a plurality of memory cells formed in the first and second memory cell regions; a border region that is part of the main surface, and is located over the well on a region between the first memory cell region and the second memory cell region; a well contact region that is formed in the well in the border region, wherein the well contact region electrically connects to a wiring layer for fixing the voltage of the well; a first dummy element and a second dummy element, wherein the first a second dummy elements are formed in the border region and do not function as device elements; a first transistor that is a component of the memory cell, wherein the first transistor is formed in the first memory cell region and is located adjacent to the first dummy element; and a second transistor that is a component of the memory cell, wherein the second transistor is formed in the second memory cell region and is located adjacent to the second dummy element; wherein the border region has a length that is equivalent to the sum of one half of the distance between a gate electrode of the first transistor and the first dummy element, the length of the first dummy element, the distance between the first dummy element and the second dummy element, the length of the second dummy element, and one half of the distance between a gate electrode of the second transistor and the second dummy element, wherein the well contact region is a first conductivity type, and a word line that extends from the first memory cell region to the second memory cell region, and passes through the border region, wherein the word line is a second conductivity type.