US6477077B2
Expired / Lapsed
US
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Non-volatile memory device
Assignee: Renesas Electronics Corp
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Filing: 2001-07-25
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Granted: 2002-11-05
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Expires: 2021-07-25
Abstract
Abstract A non-volatile memory device has a plurality of row lines extending in a first direction, a plurality of column lines extending in a second direction differing from the first direction, the plurality of column lines and the plurality of row lines forming a wiring matrix, a plurality of memory cells disposed at intersection points between the plurality of row lines and the plurality of column lines of the wiring matrix, each memory cell being formed by two ferromagnetic thin films and an insulation film therebetween, a wiring selection means for selecting at least one row line from the plurality of row lines and selecting at least one column line from the plurality of column lines, and a potential applying means for causing a prescribed current to flow in the selected row lines and column lines and applying to the row lines and column lines other than the selected row lines and column lines a prescribed potential which is not a ground potential.
Inventors
- 👤 Takeshi Okazawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 10:58
CPC Classifications
G; G11; G11C; G11C11/00; G11C11/02; G11C11/14; G11C11/15
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
236 words
A non-volatile memory device comprising: a plurality of row lines extending in a first direction; a plurality of column lines extending in a second direction differing from said first direction, said plurality of column lines and said plurality of row lines forming a wiring matrix; a plurality of memory cells disposed at intersection points between said plurality of row lines and said plurality of column lines of said wiring matrix, each memory cell being formed by two ferromagnetic thin films and an insulation film there between; a wiring selection means for selecting at least one row line from said plurality of row lines and selecting at least one column line from said plurality of column lines; and a potential applying means for causing a prescribed current to flow in said selected row lines and column lines and applying to said row lines and column lines other than said selected row lines and column lines a prescribed potential, wherein in a memory cell disposed at the intersection of a selected row line and an unselected column line a voltage drop from said selected row line to said unselected column line is not equal to a ground potential, or wherein in a memory cell disposed at the intersection of an unselected row line and a selected column line a voltage drop from said unselected row line to said selected column line is not equal to a ground potential.
Claim 2
Dependent Claim
236 words
A non-volatile memory device comprising: a plurality of row lines extending in a first direction; a plurality of column lines extending in a second direction differing from said first direction, said plurality of column lines and said plurality of row lines forming a wiring matrix; a plurality of memory cells disposed at intersection points between said plurality of row lines and said plurality of column lines of said wiring matrix, each memory cell being formed by two ferromagnetic thin films and an insulation film there between; a wiring selection means for selecting at least one row line from said plurality of row lines and selecting at least one column line from said plurality of column lines; and a potential applying means for causing a prescribed current to flow in said selected row lines and column lines and applying to said row lines and column lines other than said selected row lines and column lines a prescribed potential, wherein in a memory cell disposed at the intersection of a selected row line and an unselected column line a voltage drop from said selected row line to said unselected column line is not equal to a ground potential, or wherein in a memory cell disposed at the intersection of an unselected row line and a selected column line a voltage drop from said unselected row line to said selected column line is not equal to a ground potential.
Claim 3
Dependent Claim
177 words
A non-volatile memory device comprising: a plurality of row lines extending in a first direction; a plurality of column lines extending in a second direction differing from said first direction, said plurality of column lines and said plurality of row lines forming a wiring matrix; a plurality of memory cells disposed at intersection points between said plurality of row lines and said plurality of column lines of said wiring matrix, each memory cell being formed by two ferromagnetic thin films and an insulation film there between; a wiring selection means for selecting at least one row line from said plurality of row lines and selecting at least one column line from said plurality of column lines; and a potential applying means for causing a prescribed current to flow in said selected row lines and column lines and applying to said row lines and column lines other than said selected row lines and column lines a prescribed potential other than a ground potential and substantially not exceeding a voltage applied to said selected row lines and column lines.
Claim 4
Dependent Claim
177 words
A non-volatile memory device comprising: a plurality of row lines extending in a first direction; a plurality of column lines extending in a second direction differing from said first direction, said plurality of column lines and said plurality of row lines forming a wiring matrix; a plurality of memory cells disposed at intersection points between said plurality of row lines and said plurality of column lines of said wiring matrix, each memory cell being formed by two ferromagnetic thin films and an insulation film there between; a wiring selection means for selecting at least one row line from said plurality of row lines and selecting at least one column line from said plurality of column lines; and a potential applying means for causing a prescribed current to flow in said selected row lines and column lines and applying to said row lines and column lines other than said selected row lines and column lines a prescribed potential other than a ground potential and substantially not exceeding a voltage applied to said selected row lines and column lines.
Claim 5
Dependent Claim
192 words
A non-volatile memory device comprising: a plurality of row lines extending in a first direction; a plurality of column lines extending in a second direction differing from said first direction, said plurality of column lines and said plurality of row lines forming a wiring matrix; a plurality of memory cells disposed at intersection points between said plurality of row lines and said plurality of column lines of said wiring matrix, each memory cell being formed by two ferromagnetic thin films and an insulation film there between; a wiring selection means for selecting at least one row line from said plurality of row lines and selecting at least one column line from said plurality of column lines; and a potential applying means for causing a prescribed current to flow in said selected row lines and column lines and applying to said row lines and column lines other than said selected row lines and column lines a prescribed potential which is not a ground potential, and said prescribed potential not exceeding a maximum value and not lower than a minimum value of potential at end parts of said selected row lines and column lines.
Claim 6
Dependent Claim
192 words
A non-volatile memory device comprising: a plurality of row lines extending in a first direction; a plurality of column lines extending in a second direction differing from said first direction, said plurality of column lines and said plurality of row lines forming a wiring matrix; a plurality of memory cells disposed at intersection points between said plurality of row lines and said plurality of column lines of said wiring matrix, each memory cell being formed by two ferromagnetic thin films and an insulation film there between; a wiring selection means for selecting at least one row line from said plurality of row lines and selecting at least one column line from said plurality of column lines; and a potential applying means for causing a prescribed current to flow in said selected row lines and column lines and applying to said row lines and column lines other than said selected row lines and column lines a prescribed potential which is not a ground potential, and said prescribed potential not exceeding a maximum value and not lower than a minimum value of potential at end parts of said selected row lines and column lines.
Claim 7
Dependent Claim
52 words
A non-volatile memory device according to claim 1 , wherein said potential applying means further comprising a first power supply means for applying a first voltage to said non-selected row lines and a second power supply means for applying a second voltage differing from said first voltage to said non-selected column lines.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2005-11-04 | 2006-05-06 | 2006-11-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2009-11-04 | 2010-05-06 | 2010-11-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2013-11-04 | 2014-05-06 | 2014-11-05 | $7700.00 | Window Closed / Lapsed |