Cross point array using distinct voltages
View Patent ↗Cross point memory array using distinct voltages. The invention is a cross point memory array that applies a first select voltage on one conductive array line, a second select voltage on a second conductive array line, the two conductive array lines being uniquely defined. Additionally, an unselect voltage is applied to the unselected conductive array lines. The unselect voltage can be applied before, after or during the selection process. The unselect voltage can be approximately equal to the average of the first select voltage and the second select voltage.
1. A cross point array comprising:
a first layer of conductive array lines, the conductive array lines being arranged so that they do not come into direct contact with each other; and
a second layer of conductive array lines, the conductive array lines being arranged so that they do not come into direct contact with either each other or any of the conductive array lines of the first layer;
wherein one conductive array line from the first layer of conductive array lines and one conductive array line from the second layer of conductive array lines define a unique pair of conductive array lines, across which a read current is indicative of stored data value,
wherein applying a first select voltage to the one conductive array line from the first layer of conductive array lines and a second select voltage to the one conductive array line from the second layer of conductive array lines stores a first data value; and
wherein an unselect voltage can be applied to the unselected conductive array lines in the first and second layers, the unselect voltage being approximately equal to the average of the first select voltage and the second select voltage.
2. The cross point array of claim 1 , wherein the first select voltage is opposite in polarity and substantially equal in magnitude to the second select voltage.
3. The cross point array of claim 2 , wherein the read current is generated by applying a read voltage across the unique pair of conductive array lines.
4. The cross point array of claim 3 , wherein the unselect voltage is ground.
5. The cross point array of claim 3 , wherein a polarity of the read voltage is alternated.
6. The cross point array of claim 5 , wherein the polarity of the read voltage applied across the unique pair of conductive array lines is the same as a polarity of a write voltage applied to the unique pair of conductive array lines.
7. The cross point array of claim 1 , wherein the unselect voltage is applied after a memory plug positioned at an intersection of the unique pair of conductive array lines has been selected.
8. The cross point array of claim 7 , wherein the unselected conductive array lines are floating while the memory plug is being selected.
9. The cross point array of claim 1 , wherein the unselect voltage is applied while a memory plug positioned at an intersection of the unique pair of conductive array lines is being selected.
10. The cross point array of claim 1 , wherein the unselect voltage is applied before a memory plug positioned at an intersection of the unique pair of conductive array lines has been selected.
11. The cross point array of claim 10 , wherein the unselected conductive array lines are floating while the memory plug is being selected.
12. A cross point array:
a first layer of conductive array lines, the conductive array lines being arranged so that they do not come into direct contact with each other; and
a second layer of conductive array lines, the conductive array lines being arranged so that they do not come into direct contact with either each other or any of the conductive array lines of the first layer;
wherein one conductive array line from the first layer of conductive array lines and one conductive array line from the second layer of conductive array lines define a unique pair of conductive array lines, across which a read current is indicative of stored data, a first write voltage is used to store a first data value and a second write voltage is used to store a second data value; and
wherein an unselect voltage can be applied to unselected conductive array lines in the first and second layers and the unselect voltage is approximately equal for all of the unselected conductive array lines in the first and second layers.
13. The cross point array of claim 12 , wherein the first write voltage is applied across the unique pair of conductive array lines by applying a first select voltage to the one conductive array line from the first layer of conductive array lines and applying a second select voltage to the one conductive array line from the second layer of conductive array lines.
14. The cross point array of claim 13 , wherein the second write voltage is applied across the unique pair of conductive array lines by applying a third select voltage to the one conductive array line from the first layer of conductive array lines and applying a fourth select voltage to the one conductive array line from the second layer of conductive array lines.
15. The cross point array of claim 14 , wherein the polarity of the first select voltage is opposite the polarity of the third select voltage and the polarity of the second select voltage is opposite the polarity of the fourth select voltage.
16. The cross point array of claim 15 , wherein the magnitude of the first select voltage is substantially similar to the magnitude of the third select voltage and the magnitude of the second select voltage is substantially similar to the magnitude of the fourth select voltage.
17. The cross point array of claim 12 , wherein the unselect voltage is applied before the read current, the first write voltage or the second write voltage is applied.
18. The cross point array of claim 12 , wherein the unselect voltage is applied after the read current, the first write voltage or the second write voltage is applied.
19. The cross point array of claim 12 , wherein the unselect voltage is applied while the read current, the first write voltage or the second write voltage is applied.
20. The cross point array of claim 13 , wherein the unselect voltage is approximately equal to the average of the first select voltage and the second select voltage.
21. The cross point array of claim 12 , wherein the second write voltage is applied across the unique pair of conductive array lines by applying a third select voltage to the one conductive array line from the first layer of conductive array lines and applying a fourth select voltage to the one conductive array line from the second layer of conductive array lines.
22. The cross point array of claim 12 , wherein the read current is generated by applying a read voltage across the unique pair of conductive array lines.
23. The cross point array of claim 22 , wherein a polarity of the read voltage is alternated.
24. The cross point array of claim 23 , wherein the polarity of the read voltage applied across the unique pair of conductive array lines is the same as a polarity of a write voltage applied to the unique pair of conductive array lines.