Shared bit line SMT MRAM array with shunting transistors between bit lines
View Patent ↗An array of rows and columns of SMT MRAM cells has each of the columns associated with one of its adjacent columns. Each of the SMT MRAM cells of the column is connected to a true data bit line and each of the SMT MRAM cells of the associated pair of columns is connected to a shared complement data bit line. A shunting switch device is connected between each of the true data bit lines and the shared complement data bit line for selectively connecting one of the true data bit lines to the shared complement data bit line to effectively reduce the resistance of the complement data bit line and to eliminate program disturb effects in adjacent non-selected columns of the SMT MRAM cells.
1. An SMT MRAM memory device comprising:
array of rows and columns of SMT MRAM cells wherein Each of the columns of SMT MRAM cells is associated with one of its adjacent columns of SMT MRAM cells;
a plurality of true data bit lines, wherein each of the true data bit lines is connected to each of the SMT MRAM cells of one of the columns of SMT MRAM cells;
a plurality of complement data bit lines, wherein each complement data bit line is associated with one of the true data bit lines and connected each of the SMT MRAM cells connected to its associated true data bit line;
a plurality of true data bit line shunting switch devices, wherein at least one true data bit line shunting switch devices is connected between the true data bit line and the complement data bit line of the connected columns of SMT MRAM cells for selectively connecting one of the true data bit lines to its associated complement data bit line of a non-selected column in parallel to effectively to eliminate program disturb effects in adjacent non-selected columns of the SMT MRAM cells.
2. The SMT MRAM memory device of claim 1 further comprising a plurality of complement data bit line shunting switch devices connected between two complement data bit lines of adjacent columns of SMT MRAM cells to selectively connect the two complement data bit lines of the adjacent columns together in parallel to merge the two adjacent complement data bit lines to appear as single much wider complement data bit line that is less resistive to permit a larger and more area efficient array of SMT MRAM cells.