Patent ID: 8547734
Filing Date: 2013-10-01
Classification: G11C

Abstract:
1. A method of reading a magnetic memory cell comprising a pair of magnetic tunnel junctions (MTJs) programmed in opposite states by selecting a magnetic memory cell of a magnetic memory array to be read, the magnetic memory cell including a pair of MTJs, an access transistor coupled between a first MTJ of the pair of MTJs and a second MTJ of the pair of MTJs, the method comprising: turning ‘off’ a first word line coupled to a first access transistor that is directly coupled to a first MTJ of a pair of MTJs of a magnetic memory cell and to a second MTJ of the pair of MTJs; turning ‘on’” a second and a third word lines, the second word line coupled to a second access transistor and the third word line coupled to a third access transistor; turning ‘on’ the second and third access transistors; depending on whether the magnetic memory cell is ‘even’ or ‘odd’, turning ‘on’ ‘even’ or ‘odd’ bit lines and floating the remaining bit lines; comparing the current flowing through the first MTJ of the pair of MTJs to the current through the second MTJ of the pair of MTJs; and based on the comparison, declaring the state of the magnetic memory cell.