Patent ID: 6724065
Filing Date: 2004-04-20
Classification: G11C,H01L,Y10S

Abstract:
A static random access memory, wherein memory cells of the static random access memory each includes:N-type MOS transistors each having a channel-forming semiconductor region and a gate electrically connected with each other; and P-type MOS transistors each having a channel-forming semiconductor region electrically connected with a power source, wherein the channel-forming semiconductor regions of the P-type MOS transistors are formed of a same deep N-type well so that these channel-forming semiconductor regions are electrically connected to each other, and the channel-forming semiconductor regions of the N-type MOS transistors are formed of shallow P-type wells formed in the deep N-type well, wherein trenches are individually provided between the channel-forming semiconductor regions of the P-type and N-type MOS transistors, said trenches being deeper than the shallow P-type wells, but shallower than the deep N-type well.