Memory array method and system
View Patent ↗An MRAM memory array includes a set of memory cell strings wherein each memory cell string has a voltage divider input, a bit-sense output, a voltage divider ground, and a bit-sense output control, a shared switched voltage line that is capable of applying a voltage to the voltage divider inputs of the memory cell strings in the set, a common bit-sense line operatively coupled to the bit-sense outputs of the memory cell strings, a bit-sense output control line that is capable of selectively connecting the bit-sense output of a memory cell string to the common bit-sense line, and a ground operatively coupled to the voltage divider grounds of the voltage divider grounds.
1. An MRAM memory array, comprising:
a set of memory cell strings wherein each memory cell string has a voltage divider input, a bit-sense output, and a voltage divider ground and wherein the set of memory cell strings is arranged in a matrix of rows and columns;
a switched voltage line that is capable of applying a voltage to the voltage divider input of a memory cell string, whereupon application of the voltage selects the memory cell string and wherein the switched voltage line is operatively coupled to the voltage divider inputs of memory cell strings along a row of the matrix;
a common bit-sense line operatively coupled to the bit-sense outputs of the set of memory cell strings; and
a ground operatively coupled to the voltage divider grounds of the set of memory cell strings.
2. The MRAM memory array of claim 1 wherein the common bit-sense line is operatively coupled to the bit-sense outputs of memory cell strings along a column of the matrix.
3. The MRAM memory array of claim 1 wherein the common bit-sense line is operatively coupled to a sense amplifier.
4. The MRAM memory array of claim 1 wherein multiple common bit-sense lines are operatively coupled to a sense amplifier through a multiplexer.
5. The MRAM memory array of claim 1 wherein the switched voltage line is set to ground for unselected memory cell strings.
6. A method of fabricating an MRAM memory array comprising a set of memory cell strings wherein each memory cell string has a voltage divider input, a bit-sense output, and a voltage divider ground and wherein the set of memory cell strings is arranged in a matrix of rows and columns, the method comprising:
coupling a switched voltage line to the voltage divider inputs of memory cell strings along a row of the matrix;
coupling a common bit-sense line to the bit-sense outputs of the set of memory cell strings; and
coupling a ground to the voltage divider grounds of the set of memory cell strings.