One device field effect transistor (FET) AC stable random access memory (RAM) array

Abstract

Disclosed is an integrated circuit electrode memory array having a plurality of FET memory cells arranged in rows and columns and formed on the same integrated circuit chip with associated support circuits. Each memory cell of the array has a capacitive storage region, an adjacent channel region, and a gate region for controlling the transfer of binary information through the channel region in and out of the capacitive storage region. Each memory cell also has a bit line contact region which is shared with an adjacent memory cell. The word lines are arranged in rows in a substantially equidistant parallel relationship, each word line passing, in succession, over the storage region of a first one of the memory cells and electrically integral with the gate region of a second one of the memory cells. The column arrangement of memory cells is interdigitated such that the memory cells associated with a single bit line are arranged in first and second parallel lines along both the left and right sides of each bit line. Thus, the bit line is arranged in a zig-zag configuration alternatively contacting memory cells arranged along its left and right side.

What is claimed is: 
     
       1. An integrated circuit electronic memory array having a plurality of memory cells, each memory cell of said array having a gate region for controlling the transfer of binary information in and out of a corresponding storage region, and a bit line contact region, said array comprising: a plurality of word lines arranged in rows each of said word lines alternately passing over the storage region of a first one of said memory cells and being electrically integral with the gate region of a second one of said memory cells; and   a plurality of bit lines arranged in columns substantially orthogonal to said word lines, memory cells being arranged along first and second parallel lines in each one of said columns;   each of said plurality of bit lines having portions extending to electrically contact memory cells arranged along said first and second parallel lines, respectively.[...]..Iadd., wherein each said bit line contact region is a common bit line contact region for a pair of adjacent memory cells along said plurality of bit lines. .Iaddend. .[.2. An integrated circuit electronic memory array as in claim 1 wherein each said bit line contact region is a common bit line contact region for a pair of   
     
     
        adjacent memory cells along said plurality of bit lines..]. 3. An integrated circuit electronic memory array as in claim 1 wherein at least one of said plurality of word lines is spaced substantially the same 
     
     
        distance from each of its adjacent word lines. 4. An integrated circuit electronic memory array as in claim 1 wherein each said plurality of bit lines is formed substantially passing over each said plurality of word 
     
     
        lines. 5. An integrated circuit electronic memory array as in claim 4 wherein each said plurality of word lines is formed from a conductive material selected from the group consisting of polysilicon and polysilicide material, and each said plurality of bit lines is formed from 
     
     
        a metal. 6. An integrated circuit electronic memory array as in claim 4 wherein each said plurality of word lines and bit lines is formed from a conductive material selected from the group consisting of polysilicon and 
     
     
        polysilicide material. 7. An integrated circuit electronic memory array as in claim 1 wherein said plurality of memory cells and associated support circuits are formed on a semiconductor substrate doped with impurities of a first conductivity type and comprising: a doped region of a second conductivity type introduced into said substrate and forming a PN junction therewith, one of said plurality of bit lines contacting said doped region and forming said bit line contact region therewith;   a channel region in said substrate adjacent said doped region and underlying the gate region electrically integral with one of said plurality of word lines;   a capacitor region in said substrate adjacent said channel region and underlying a plate region, forming said corresponding storage region; and   an isolation region formed into said substrate adjacent said capacitor   
     
     
        region. 8. An integrated circuit electronic memory array as in claim 7 wherein said doped region is shared with an adjacent memory cell also 
     
     
        having a capacitor region, a channel region, and an isolation region. 9. An integrated circuit electronic memory array as in claim 8 further comprising: an additional doped region of a second conductivity type also introduced into said substrate and forming a PN junction therewith, and positioned   
     
     
        between said channel region and said capacitor region. 10. An integrated circuit electronic memory array as in claim 7 wherein said first conductivity type is formed by P type impurities and said second 
     
     
        conductivity type is formed by N type impurities. 11. An integrated circuit electronic memory array as in claim 7 wherein said word line is 
     
     
        formed from a polysilicon material. 12. An integrated circuit electronic memory array as in claim 7 wherein said word line is formed from a 
     
     
        polysilicide material. 13. An integrated circuit electronic memory array as in claim 7 wherein said word lines are positioned entirely above the substrate surface and said bit lines are positioned substantially passing 
     
     
        over said word lines. 14. An integrated circuit electronic memory array as 
     
     
        in claim 13 wherein said bit lines are formed from a metal. 15. An integrated circuit electronic memory array as in claim 7 further comprising: an additional doped region of a second conductivity type also introduced into said substrate and forming a PN junction therewith, and positioned   
     
     
        between said channel region and said capacitor region. 16. An integrated circuit electronic memory array having a plurality of memory cells, each memory cell of said array having a gate region for controlling the transfer of binary information in and out of a corresponding storage region, and a bit line contact region, said array comprising: a plurality of word lines arranged in rows, each said word lines alternately passing over the storage region of a first one of said memory cells and being electrically integral with the gate region of a second one of said memory cells; and   a plurality of bit lines arranged in columns substantially along parallel center lines orthogonal to said word lines, each said plurality of bit lines alternately contacting a bit line contact region on opposite sides of its center line.[...]..Iadd., wherein each said bit line contact region is a common bit line contact region for a pair of adjacent memory cells along said plurality of bit lines. .Iaddend. .[.17. An integrated circuit electronic memory array as in claim 16 wherein each said bit line contact region is a common bit line contact region for a pair of adjacent memory   
     
     
        cells along said plurality of bit lines..]. 18. An integrated circuit electronic memory array as in claim 16 wherein at least one of said plurality of word lines is spaced substantially the same distance from 
     
     
        each of its adjacent word lines. 19. An integrated circuit electronic memory array as in claim 16 wherein each said plurality of bit lines is 
     
     
        formed substantially passing over each said plurality of word lines. 20. An integrated circuit electronic memory array as in claim 16 wherein each said plurality of word lines is formed from a conductive material selected from the group consisting of polysilicon and polysilicide material, and each said plurality of bit lines is formed from a metal. 
     
     
            An integrated circuit electronic memory array as in claim 16 wherein each said plurality of word lines is formed from a conductive material selected from the group consisting of polysilicon and polysilicide 
     
     
        material. 22. An integrated circuit electronic memory array as in claim 16 wherein said plurality of memory cells and associated support circuits are formed on a semiconductor substrate doped with impurities of a first conductivity type and comprising: a doped region of a second conductivity type introduced into said substrate and forming a PN junction therewith, one of said plurality of bit lines contacting said doped region and forming said bit line contact region therewith;   a channel region in said substrate adjacent said doped region and underlying the gate region electrically integral with one of said plurality of word lines;   a capacitor region in said substrate adjacent said channel region and underlying a plate region, forming said corresponding storage region; and   an isolation region formed into said substrate adjacent said capacitor   
     
     
        region. 23. An integrated circuit electronic memory array as in claim 22 wherein said doped region is shared with an adjacent memory cell also 
     
     
        having a capacitor region, a channel region, and an isolation region. 24. An integrated circuit electronic memory array as in claim 22 wherein said first conductivity type is formed by P type impurities and said 
     
     
        second conductivity type is formed by N type impurities. 25. An integrated circuit electronic memory array as in claim 22 wherein said word line is 
     
     
        formed from a polysilicon material. 26. An integrated circuit electronic memory array as in claim 22 wherein said word line is formed from a 
     
     
        polysilicide material. 27. An integrated circuit electronic memory array as in claim 22 wherein said word lines are positioned entirely above the substrate surface and said bit lines are positioned substantially passing 
     
     
        over said word lines. 28. An integrated circuit electronic memory array as 
     
     
        in claim 27 wherein said bit lines are formed from a metal. 29. An integrated circuit electronic memory array as in claims 1 or 16, further comprising: a plurality of conducting lines disposed over corresponding ones of said plurality of word lines respectively and making periodic electrical contact with said plurality of word lines, thereby reducing the effective electrical resistance of each said plurality of word lines. .Iadd.30. An integrated circuit electronic memory array as in claim 1 wherein each said bit line has sides which change direction at spaced intervals along the   
     
     
        length of the line..Iaddend. .Iadd.31.  An integrated circuit electronic memory array as in claim 1 wherein said gate region and said storage region of each said pair of cells lie in that sequence from said bit line contact region along the same one of said first and second parallel lines..Iaddend.