Apparatuses and methods for providing set and reset voltages at the same time
View Patent ↗Apparatuses and methods are described, such as those involving driver circuits that are configured to provide reset and set voltages to different variable state material memory cells in an array at the same time. Additional apparatuses, and methods are described.
1. A memory device, comprising:
an array of memory cells, each of the cells including a variable state material; and
a driver coupled to the array of memory cells to provide set and reset voltages to different memory cells in the array at the same time.
2. The memory device of claim 1 , wherein the variable state material includes a resistance switching material.
3. The memory device of claim 1 , wherein the driver is configured to provide three different voltages to different memory cells in the array at the same time.
4. The memory device of claim 3 , wherein the three different voltages include the set voltage, the reset voltage and an inhibit voltage.
5. The memory device of claim 1 , wherein the array further includes selector devices to access memory cells.
6. The memory device of claim 5 , wherein the selector devices include N channel transistors.
7. The memory device of claim 5 , wherein the selector devices include P channel transistors.
8. A driver circuit, comprising:
a plurality of voltage input nodes, including a reset voltage input node and a set voltage input node;
selector circuitry to selectively couple the reset voltage input node and the set voltage input node to different memory cells in an array of memory cells at the same time.
9. The driver circuit of claim 8 , wherein the selector circuitry is coupled to a number of data lines, wherein the selector circuitry selectively couples the voltage input nodes to the different memory cells in the array via the number of data lines.
10. The driver circuit of claim 8 , wherein the plurality of voltage input nodes includes three different voltage input nodes.
11. The driver circuit of claim 10 , wherein the three different voltage input nodes includes the set voltage node, the reset voltage node, and an inhibit voltage node.
12. The driver circuit of claim 8 , wherein each of the memory cells includes a variable state material.
13. The driver circuit of claim 12 , wherein the plurality of voltage input nodes includes a set voltage node approximately equal to 4 volts.
14. The driver circuit of claim 12 , wherein the plurality of voltage input nodes includes a reset voltage node approximately equal to 2 volts.
15. The driver circuit of claim 12 , wherein the plurality of voltage input nodes includes an inhibit voltage node approximately equal to 3 volts.
16. An apparatus, comprising:
an array of memory cells, each of the cells including a resistance switching material;
a driver circuit coupled to data lines of the array to provide set and reset voltages to selected ones of the memory cells in the array at the same time.
17. The apparatus of claim 16 , wherein each of the cells further includes first and second electrodes, wherein the switching material is between the first and second electrodes.
18. The apparatus of claim 16 , further including a host processor coupled to the driver circuit.
19. The apparatus of claim 18 , wherein the host processor and the array of memory cells are located in a single chip assembly.
20. A method, comprising:
selecting a plurality of resistive random access memory cells;
driving reset and set voltages to different ones of the memory cells in the selected plurality at the same time.
21. The method of claim 20 , wherein driving reset and set voltages to different ones of the memory cells in the selected plurality at the same time includes driving reset, set and inhibit voltages to different ones of the memory cells in the selected plurality at the same time.
22. The method of claim 20 , wherein driving reset and set voltages to different ones of the memory cells in the selected plurality at the same time comprises driving the reset and set voltages using a driver circuit.
23. The method of claim 22 , wherein a column decoder comprises the driver circuit and wherein selecting a plurality of resistive random access memory cells comprises selecting a plurality of resistive random access memory cells using row selection circuitry.
24. The method of claim 20 , wherein driving reset and set voltages to different ones of the memory cells in the selected plurality at the same time includes driving substantially discrete reset and set voltages.
25. The method of claim 24 , wherein driving substantially discrete reset and set voltages to different ones of the memory cells in the selected plurality at the same time comprises driving substantially discrete inhibit, reset and set voltages to different ones of the memory cells in the selected plurality at the same time.
26. The method of claim 21 , wherein the set voltage is substantially equal to the inhibit voltage plus a voltage offset, and wherein the reset voltage is substantially equal to the inhibit voltage minus the voltage offset.
27. The method of claim 26 , wherein the inhibit voltage is approximately 3 volts, and the voltage offset is approximately one volt.
28. The method of claim 21 , wherein the reset voltage is less than the inhibit voltage, and the inhibit voltage is less than the set voltage.
29. A method, comprising:
coupling a variable state material to a selector device to form a memory cell;
coupling a plurality of memory cells to a plurality of transmission lines;
coupling a driver to the plurality of transmission lines; and
forming circuitry in the driver capable of providing two or more different voltages to different transmission lines at the same time.
30. The method of claim 29 , wherein forming circuitry in the driver includes forming circuitry capable of three different voltages of the same polarity, wherein inhibit voltage is less than the set voltage, and the set voltage is less than the reset voltage.
31. The method of claim 29 , wherein forming circuitry in the driver includes forming circuitry capable of three different voltages of the same polarity, wherein inhibit voltage is less than the reset voltage, and the reset voltage is less than the set voltage.
32. The method of claim 29 , wherein forming circuitry in the driver includes forming circuitry capable of three different voltages of the same polarity, wherein inhibit voltage is greater than the set voltage, and the set voltage is greater than the reset voltage.
33. The method of claim 29 , wherein forming circuitry in the driver includes forming circuitry capable of three different voltages of the same polarity, wherein inhibit voltage is greater than the reset voltage, and the reset voltage is greater than the set voltage.