Memory array with reduced charging current
AssigneeSiemens Aktiengesellschaft
InventorMartin Brox
Life of this patent
Estimating the term…
Loading patent…
AssigneeSiemens Aktiengesellschaft
InventorMartin Brox
Estimating the term…
The spacing of the bit lines and/or the master bit lines (MBLs) of a memory array is skewed to decrease the charging current required to precharge the bit-lines and or the master bit lines. In one embodiment of the invention, an integrated circuit (IC) includes an array of memory cells arranged in rows and columns, with a pair of bit lines (BLTi and BLCi) per column of memory cells with BLTi carrying the cell data and BLCi its complement. The bit lines are disposed within a first level of the IC and run generally parallel to each other wherein there is a certain capacitance, CINT, between each two paired bit lines (BLTi and BLCi) and a capacitance, CEXT, between the bit lines of adjacent columns. The bit lines are coupled to selected MBLs with the MBLs being paired so that one MBL of a pair (MBLT) carries bit line data and the other MBL of a pair (MBLC) carries the complement of that bit line data. The MBLs are formed on a second level of the IC and run generally parallel to each other wherein there is a capacitance (MCINT) between the two paired master bit lines and a capacitance (MCEXT) between the master bit lines of a pair and the adjacent master bit lines. The spacing between the bit lines is skewed in order to decrease CINT relative to CEXT, and/or the spacing between the MBLs is skewed in order to decrease MCINT relative to MCEXT.
In an integrated circuit (IC) including an array of memory cells arranged in rows and columns and including a pair of bit lines per column of memory cells, the pair of bit lines per column for carrying the data of a cell and its complement, and wherein the bit lines are disposed along a level of the IC, wherein there is a capacitance, CINT, between paired bit-lines and a capacitance, CEXT, between each one of the bit-lines of a pair and the bit lines of adjacent columns, the improvement comprising:
In an integrated circuit (IC) including an array of memory cells arranged in rows and columns and including a pair of bit lines per column of memory cells, the pair of bit lines per column for carrying the data of a cell and its complement, and wherein the bit lines are disposed along a level of the IC, wherein there is a capacitance, CINT, between paired bit-lines and a capacitance, CEXT, between each one of the bit-lines of a pair and the bit lines of adjacent columns, the improvement comprising:
In an integrated circuit (IC) including an array of memory cells arranged in rows and columns and including a pair of bit-lines per column of memory cells, the pair of bit-lines per column for carrying the data of a cell and its complement, and wherein the bit-lines are disposed along a level of the IC, wherein there is a capacitance, CINT, between each two paired bit-lines and a capacitance, CEXT, between the bit-lines of adjacent columns, and wherein the bit-lines are precharged before each read operation of the memory cells, the improvement comprising:
In an integrated circuit (IC) including an array of memory cells arranged in rows and columns and including a pair of bit-lines per column of memory cells disposed within a first level of the IC, with one bit-line of a pair for carrying the data contained in the memory cells of its associated column, and the other bit-line of a pair for carrying the complement of that data, and including master bit-lines (MBL) disposed within a second level of the IC with the master bit-lines being coupled to a predetermined number of bit-lines, and the master bit-lines being arranged in pairs with one MBL of a pair for carrying the data of one or more bit lines and the other MBL of a pair for carrying the complement of that data, and wherein there is a capacitance, MCINT, between paired master bit-lines and a capacitance, MCEXT, between the master bit-lines of a pair of master bit lines and the adjacent master bit-lines, the improvement comprising:
Dependencies are inferred from the claim text.