Resistance variable element methods and apparatuses
Apparatus and methods are disclosed, including a method that performs a first operation on a first resistance variable element using a common source voltage, a first data line voltage and a first control gate voltage, and then performs a second operation on a second resistance variable element using the common source voltage, a second data line voltage and a second control gate voltage. Additional apparatus and methods are described.
1. A method comprising:
performing a program operation on a first resistance variable element coupled to a first access device, wherein performing the program operation comprises providing the first access device with a first control gate voltage, the first resistance variable element and the first access device being coupled between a first data line at a first data line voltage and a common source at a common source voltage; and
performing an erase operation on a second resistance variable element coupled to a second access device, wherein performing the erase operation comprises providing the second access device with a second control gate voltage that is greater than the first control gate voltage, the second resistance variable element and the second access device being coupled between a second data line at a second data line voltage that is greater than the first data line voltage and the common source biased at the common source voltage.
2. The method of claim 1 , wherein:
providing the first access device with the first control gate voltage comprises providing a first field-effect transistor with the first control gate voltage; and
providing the second access device with the second control gate voltage comprises providing a second field-effect transistor with the second control gate voltage.
3. The method of claim 1 , further comprising providing a common source voltage of approximately 1.5 volts to the common source.
4. The method of claim 1 , wherein the second control gate voltage is substantially equal to the first control gate voltage plus the common source voltage.
5. The method of claim 1 , wherein the first data line voltage is less than the common source voltage.
6. The method of claim 5 , further comprising providing the common source voltage to the first data line and the second data line after performing the first operation and before performing the second operation.
7. The method of claim 1 , wherein the second data line voltage is higher than the common source voltage.
8. A method comprising:
providing a common source voltage to a common source;
providing a plurality of data lines with a standby data line voltage;
providing a plurality of access devices with a control gate voltage;
providing a first data line voltage to a first one of the data lines to program a first resistance variable element coupled to a first one of the access devices, the first one of the access devices and the first resistance variable element being coupled between the first one of the data lines and the common source biased at the common source voltage;
providing a second data line voltage, that is higher than the first data line voltage, to a second one of the data lines to erase a second resistance variable element coupled to a second one of the access devices, the second one of the access devices and the second resistance variable element being coupled between the second one of the data lines and the common source that is biased at the common source voltage.
9. The method of claim 8 , wherein the standby data line voltage equal to the common source voltage.
10. A method comprising:
providing a common source voltage to a common source of an array of memory cells;
providing a plurality of data lines of the array with a standby data line voltage;
providing a first data line voltage to a first one of the data lines;
providing a first access device with a first control gate voltage to program a first resistance variable element coupled to the first access device between the common source, biased at the common source voltage, and the first one of the data lines;
providing the standby data line voltage to the first data line;
providing a second data line voltage, greater than the first data line voltage, to the second one of the data lines; and
providing a second access device with a second control gate voltage to erase a second resistance variable element coupled to the second access device between the common source, biased at the common source voltage, and the second data line.
11. The method of claim 10 , wherein:
providing the first access device with the first control gate voltage comprises raising a gate terminal of the first access device from a reference voltage to the first control gate voltage; and
providing the second access device with the second control gate voltage comprises raising a gate terminal of the second access device from the reference voltage to the second control gate voltage.
12. The method of claim 10 , wherein:
providing the first access device with the first control gate voltage comprises raising a gate terminal of the first access device from a reference voltage to the first control gate voltage; and
providing the second access device with the second control gate voltage comprises raising a gate terminal of the second access device from the first control gate voltage to the second control gate voltage.
13. The method of claim 10 , wherein:
providing the first access device with the first control gate voltage comprises lowering a gate terminal of the first access device from a reference voltage to the first control gate voltage; and
providing the second access device with the second control gate voltage comprises lowering a gate terminal of the second access device from the reference voltage to the second control gate voltage.
14. The method of claim 10 , wherein:
providing the first access device with the first control gate voltage comprises lowering a gate terminal of the first access device from a reference voltage to the first control gate voltage; and
providing the second access device with the second control gate voltage comprises raising a gate terminal of the second access device from the first control gate voltage to the second control gate voltage.
15. The method of claim 10 , wherein:
providing the plurality of data lines of the array with the standby data line voltage comprises providing the plurality of data lines with the common source voltage.
16. An apparatus comprising:
a plurality of data lines;
a common source;
a plurality of resistance variable memory cells, each resistance variable memory cell being coupled between one of the data lines and the common source, wherein each resistance variable memory cell comprises a resistance variable element coupled to an access device; and
a memory control unit configured to control:
provision of a standby data line voltage to the data lines;
performance of a program operation on first one of the resistance variable elements, wherein performance of the program operation comprises providing a first one of the access devices with a first control gate voltage, wherein a first one of the data lines is at a first data line voltage and the common source is at a common source voltage; and
performance of an erase operation on a second one of the resistance variable elements, wherein performance of the an erase operation comprises providing a second one of the access devices with a second control gate voltage that is greater than the first control gate voltage and providing a second data line voltage to a second one of the data lines that is different than the first data line voltage, wherein the common source is at the common source voltage during the performance of the erase operation.
17. The apparatus of claim 16 , wherein the apparatus comprises a system.
18. The apparatus of claim 16 , wherein the apparatus comprises a resistive random access memory device.
19. The apparatus of claim 16 , wherein provision of a standby data line voltage to the data lines comprises provision of the common source voltage to the data lines.
20. The apparatus of claim 16 , wherein the second control gate voltage is lower than the first control gate voltage.