SHARED SOURCE LINE MAGNETIC TUNNEL JUNCTION (MTJ) BIT CELLS EMPLOYING UNIFORM MTJ CONNECTION PATTERNS FOR REDUCED AREA

摘要

Shared source line magnetic tunnel junction (MTJ) bit cells (300A) employing uniform MTJ connection patterns for reduced area are disclosed. In one aspect, a two (2) transistor, two (2) MTJ (2T2MTJ) bit cell includes a shared source line system having first and second source lines. A uniform MTJ connection pattern results in the first source line (SL1) disposed in an upper metal layer and electrically coupled to a free layer of a first MTJ (304), and the second source line (SL2) disposed in a lower metal layer and electrically coupled to a second access transistor (310). Middle segments are disposed in middle metal layers to reserve the middle metal layers for strap segments (368) of a strap cell (300B) that is used to electrically couple the first and second source lines. Electrically coupling the first and second source lines using the strap cell allows each MTJ to logically share a single source line.