PAGE BUFFER CIRCUIT, NONVOLATILE MEMORY DEVICE INCLUDING THE PAGE BUFFER CIRCUIT, AND METHOD OF OPERATING THE NONVOLATILE MEMORY DEVICE
First Claim
1. A page buffer circuit, comprising:
- a bit line selection unit configured to select a bit line coupled to memory cells;
a latch unit, comprising a plurality of latch circuits coupled to a sense node and configured to latch data to be programmed into the memory cells or store data from the memory cells; and
a bit line control unit coupled to the sense node and configured to temporarily charge a voltage of the selected bit line in response to charge and transfer control signals or transfer the charged voltage to the selected bit line.
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Accused Products
Abstract
A page buffer circuit comprises a bit line selection unit, a latch unit, and a bit line control unit. The bit line selection unit is configured to select a bit line coupled to memory cells. The latch unit comprises a plurality of latch circuits. The plurality of latch circuits is coupled to a sense node and configured to latch data to be programmed into the memory cells or store data from the memory cells. The bit line control unit is coupled to the sense node and configured to temporarily charge a voltage of the selected bit line in response to charge and transfer control signals or transfer the charged voltage to the selected bit line.
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Citations
10 Claims
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1. A page buffer circuit, comprising:
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a bit line selection unit configured to select a bit line coupled to memory cells; a latch unit, comprising a plurality of latch circuits coupled to a sense node and configured to latch data to be programmed into the memory cells or store data from the memory cells; and a bit line control unit coupled to the sense node and configured to temporarily charge a voltage of the selected bit line in response to charge and transfer control signals or transfer the charged voltage to the selected bit line. - View Dependent Claims (2)
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3. A nonvolatile memory device, comprising:
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a memory cell array comprising a number of memory blocks each including memory cells for storing data, the memory cells being coupled by a bit line and a word line; a page buffer unit, comprising page buffers coupled to the bit line and configured to include a plurality of latch circuits for latching data to be programmed into the memory cells or storing data from the memory cells, wherein each of the page buffers comprises a bit line control unit configured to temporarily charge a voltage of a bit line varying according to a program degree of memory cells when a program verification operation is performed and to provide the bit line with the charged voltage when a program operation for the bit line is performed; and a control unit configured to control a program, read, or erase operation, charge a voltage of a bit line according to a verification result to the page buffer when a program verification operation is performed using a double verification method, and apply the bit line with the voltage charged at the page buffer when a program operation is performed. - View Dependent Claims (4, 5)
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6. A method of operating a nonvolatile memory device, the method comprising:
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a first program step of performing a program operation using a first program voltage; a first verification step of performing a first verification operation on selected memory cells using a first verification voltage and temporarily charging a voltage of a bit line coupled to the selected memory cells; a second verification step of performing a second verification operation using a second verification voltage higher than the first verification voltage; a bit line voltage change step of, if a result of the second verification operation is not a pass, precharging the bit line in proportion to the temporarily charged voltage; and a second program step of performing a program operation using a second program voltage higher than the first program voltage by as much as a step voltage. - View Dependent Claims (7, 8)
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9. A page buffer circuit, comprising:
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a bit line selection unit configured to select a bit line coupled to memory cells; a latch unit configured to latch data to be programmed into the memory cells or store data from the memory cells through a sense node; and a bit line control unit configured to charge a voltage of the selected bit line in response to a charge control signal when a program verification operation is performed, and when a result of the program verification operation is a fail, re-execute the program verification operation by supplying the selected bit line with the charged voltage in response to a transfer control signal. - View Dependent Claims (10)
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Specification