Shared source line magnetic tunnel junction (MTJ) bit cells employing uniform MTJ connection patterns for reduced area
US9496314B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 14, 2015 |
| Grant date | Nov 15, 2016 |
| Priority date | — |
| Expiry date | Sep 14, 2035 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH10N50/80
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
Shared source line magnetic tunnel junction (MTJ) bit cells 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 disposed in an upper metal layer and electrically coupled to a free layer of a first MTJ, and the second source line disposed in a lower metal layer and electrically coupled to a second access transistor. Middle segments are disposed in middle metal layers to reserve the middle metal layers for strap segments of a strap cell that may be 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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.