Apparatus and methods including source gates
First Claim
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1. A method for operation of a memory device, the method comprising:
- biasing a common source to 0 volts;
turning on a first source select gate coupled to a selected string of charge storage devices;
turning off a second source select gate coupled to an unselected string of charge storage devices;
turning on a source gate coupled to both the selected and unselected string of charge storage devices;
biasing, with a read voltage, a selected access line coupled to a selected charge storage device in the selected string of charge storage devices;
biasing a plurality of unselected access lines to a voltage greater than the read voltage, the unselected access lines coupled to charge storage devices not being read; and
biasing a slot, coupled to a semiconductor well of the selected and unselected string of charge storage device, with 0 volts.
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Abstract
Apparatus and methods are disclosed, such as an apparatus that includes a string of charge storage devices associated with a pillar (e.g., of semiconductor material), a source gate device, and a source select device coupled between the source gate device and the string. Additional apparatus and methods are described.
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Citations
18 Claims
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1. A method for operation of a memory device, the method comprising:
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biasing a common source to 0 volts; turning on a first source select gate coupled to a selected string of charge storage devices; turning off a second source select gate coupled to an unselected string of charge storage devices; turning on a source gate coupled to both the selected and unselected string of charge storage devices; biasing, with a read voltage, a selected access line coupled to a selected charge storage device in the selected string of charge storage devices; biasing a plurality of unselected access lines to a voltage greater than the read voltage, the unselected access lines coupled to charge storage devices not being read; and biasing a slot, coupled to a semiconductor well of the selected and unselected string of charge storage device, with 0 volts. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method for operation of a memory device, the method comprising:
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biasing a common source to 0 volts; biasing a control gate of a first source select gate, coupled to a selected string of charge storage devices, at a voltage; biasing a control gate of a second source select gate, coupled to an unselected string of charge storage devices, with the voltage; turning off a source gate coupled to both the selected and unselected string of charge storage devices; biasing, with a programming voltage, a selected access line coupled to a selected charge storage device in the selected string of charge storage devices; and biasing a plurality of unselected access lines to a voltage that is less than the programming voltage, the unselected access lines coupled to charge storage devices not being programmed; and biasing a slot, coupled to a semiconductor well of the selected and unselected string of charge storage devices, with a voltage in a range of 0V to 2V. - View Dependent Claims (10)
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11. A method for operation of a memory device, the method comprising:
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biasing a common source to 0 volts; biasing a control gate of a first source select gate, coupled to a selected string of charge storage devices, at a voltage; biasing a control gate of a second source select gate, coupled to an unselected string of charge storage devices, with the voltage; turning off a source gate coupled to both the selected and unselected string of charge storage devices; biasing, with a programming voltage, a selected access line coupled to a selected charge storage device in the selected string of charge storage devices; and biasing a plurality of unselected access lines to a voltage that is less than the programming voltage, the unselected access lines coupled to charge storage devices not being programmed; wherein turning on the first and second source select gates comprises biasing control gates of the first and second source select gates with a voltage between 0V and 3V.
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12. A method for operation of a memory device, the method comprising:
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biasing a common source to 0 volts; biasing a control gate of a first source select gate, coupled to a selected string of charge storage devices, at a voltage; biasing a control gate of a second source select gate, coupled to an unselected string of charge storage devices, with the voltage; turning off a source gate coupled to both the selected and unselected string of charge storage devices; biasing, with a programming voltage, a selected access line coupled to a selected charge storage device in the selected string of charge storage devices; biasing a plurality of unselected access lines to a voltage that is less than the programming voltage, the unselected access lines coupled to charge storage devices not being programmed; and biasing a data line coupled to the selected and unselected strings of charge storage devices with a voltage that is less than 1V.
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13. A method for operation of a memory device, the method comprising:
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biasing a common source to 0 volts; biasing a control gate of a first source select gate, coupled to a selected string of charge storage devices, at a voltage; biasing a control gate of a second source select gate, coupled to an unselected string of charge storage devices, with the voltage; turning off a source gate coupled to both the selected and unselected string of charge storage devices; biasing, with a programming voltage, a selected access line coupled to a selected charge storage device in the selected string of charge storage devices; and biasing a plurality of unselected access lines to a voltage that is less than the programming voltage, the unselected access lines coupled to charge storage devices not being programmed; wherein biasing the plurality of unselected access lines to the voltage that is less than the programming voltage comprises biasing the plurality of unselected access lines with 10V.
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14. A method for operation of a memory device, the method comprising:
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biasing a semiconductor well to a first voltage substantially equal to 20V; biasing a first source select gate, coupled to a selected string of charge storage devices that is coupled to the well, at the first voltage; biasing a second source select gate, coupled to an unselected string of charge storage devices that is coupled to the well, at the first voltage; biasing a source gate, coupled to both the selected and unselected string of charge storage devices, at the first voltage; biasing, with an erase voltage, a selected access line coupled to a selected charge storage device in the selected string of charge storage devices; and biasing a plurality of unselected access lines, coupled to charge storage devices not being erased, with the erase voltage. - View Dependent Claims (15, 16, 17, 18)
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Specification