Patent ID: 7376004

Claim:
A Magnetic Random Access Memory (MRAM) device comprising: an array of magnetic memory cells arranged in intersecting rows and columns; a plurality of magnetic memory cell selection devices, each of which is coupled to a respective one of the magnetic memory cells in the array to enable selective access to any of the magnetic memory cells during a write operation, wherein a number of the rows included in the array is limited according to the relation: η = R m * ɛ ⁡ ( 2 + K DR ) R r ⁡ ( 1 - ɛ ) where R m comprises a resistance of one of the magnetic memory cells, ε comprises a maximum current non-uniformity of the array during a write operation, K DR depends on a reverse bias resistance of one of the magnetic memory cell selection devices, and R r comprises a resistance of a row or column of the magnetic memory cells.