Patent application number | Description | Published |
20090184305 | Resistive memory devices and methods of manufacturing the same - A resistive memory device includes a first electrode and a first insulation layer arranged on the first electrode. A portion of the first electrode is exposed through a first hole in the first insulation layer. A first variable resistance layer contacts the exposed portion of the first electrode and extends on the first insulation layer around the first hole. A first switching device electrically connects to the first resistive switching layer. | 07-23-2009 |
20090184396 | Resistive random access memories and methods of manufacturing the same - Provided are resistive random access memories (RRAMs) and methods of manufacturing the same. A RRAM includes a storage node including a variable resistance layer, a switching device connected to the storage node, and a protective layer covering an exposed part of the variable resistance layer. The protective layer includes at least one of aluminum oxide and titanium oxide. The variable resistance layer is a metal oxide layer. | 07-23-2009 |
20090242992 | Inverter, logic circuit including an inverter and methods of fabricating the same - An inverter, a logic circuit including the inverter and method of fabricating the same are provided. The inverter includes a load transistor of a depletion mode, and a driving transistor of an enhancement mode, which is connected to the load transistor. The load transistor may have a first oxide layer as a first channel layer. The driving transistor may have a second oxide layer as a second channel layer. | 10-01-2009 |
20090290423 | METHOD OF ERASING A NONVOLATILE MEMORY DEVICE - In a method of erasing a nonvolatile memory device, an erase operation is performed on memory cells of a selected block. A first soft program operation is performed on the cells on which the erase operation has been performed. The erase operation and the first soft program operation are repeatedly performed by increasing an erase voltage by a first step voltage until a threshold voltage of the memory cells becomes lower than a first erase verify voltage. When the threshold voltage of the memory cells becomes lower than the first erase verify voltage, a second soft program operation is performed. The second soft program operation is repeatedly performed by increasing a soft program voltage by a second step voltage until a cell is programmed to have a soft program verify voltage. | 11-26-2009 |
20090290427 | METHOD OF ERASING A NONVOLATILE MEMORY DEVICE - The present invention relates to a method of erasing a nonvolatile memory device. According to an aspect of the present invention, an erase operation is performed on a selected memory block. The bit lines of the memory block are precharged, and a change of a voltage level of the bit lines is verified according to an erase state of the memory cells. A data read operation is performed on a first bit line according to a voltage level of the first bit line. A data read operation is performed on a second bit line according to a voltage level of the second bit line. The data read operation is performed on the second bit line after the data read operation is performed on the first bit line. An erase verify result is then determined according to the data read operation result. | 11-26-2009 |
20090290433 | METHOD OF INPUTTING ADDRESS IN NONVOLATILE MEMORY DEVICE AND METHOD OF OPERATING THE NONVOLATILE MEMORY DEVICE - A method of inputting address in a nonvolatile memory device includes inputting a row address including an information for selecting a memory block and an information for selecting a page, and inputting a column including an information for selecting a column and an information for selecting a plane. | 11-26-2009 |
20100008137 | NONVOLATILE MEMORY DEVICE AND PROGRAM OR ERASE METHOD USING THE SAME - A nonvolatile memory device includes a comparison unit configured to compare a reference voltage and a voltage of each of a plurality of nodes of a sample memory cell string, a state storage unit configured to store state information of each of memory cells depending on the corresponding comparison result of the comparison unit, and a high voltage generation unit configured to change a program start voltage depending on data stored in the state storage unit. | 01-14-2010 |
20100195402 | PAGE BUFFER CIRCUIT - A page buffer circuit comprises a first sensing unit configured to sense a voltage of a bit line and change a voltage of a first sense node, a data conversion unit configured to sense a voltage level of the first sense node and change a voltage level of a second sense node or to couple the second sense node and the first sense node, and first and second latch units coupled in common to the second sense node. | 08-05-2010 |
20100195406 | METHOD OF OPERATING NONVOLATILE MEMORY DEVICE - A method of operating a nonvolatile memory device comprising cell strings each comprising memory cells coupled in series between a drain select transistor and a source select transistor, including precharging a sense node to thereby precharge a bit line coupled to the cell string for a program or data read operation; and simultaneously resetting a cell channel in a state in which the drain select transistor is turned off, the source select transistor is turned on, and the memory cells are turned on by applying a first voltage to a number of word lines coupled to the memory cells during a first time period, wherein the first time period is less than a bit line precharge time period. | 08-05-2010 |
20100283509 | Inverter, logic circuit including an inverter and methods of fabricating the same - An inverter, a logic circuit including the inverter and method of fabricating the same are provided. The inverter includes a load transistor of a depletion mode, and a driving transistor of an enhancement mode, which is connected to the load transistor. The load transistor may have a first oxide layer as a first channel layer. The driving transistor may have a second oxide layer as a second channel layer. | 11-11-2010 |
20110158000 | SEMICONDUCTOR MEMORY DEVICE AND METHOD OF PROGRAMMING THE SAME - A semiconductor memory device includes a voltage generator configured to supply a program voltage, a sub-verification voltage, or a target verification voltage to memory cells selected during a program operation, page buffers configured to latch first data according to results from comparing threshold voltages of the selected memory cells with the sub-verification voltage and latch second data according to results from comparing the threshold voltages of the memory cells with the target verification voltage, a sub-pass check circuit configured to output a sub-pass signal in response to the first data outputted from the page buffers, a main pass check circuit configured to output a main pass signal in response to the second data outputted from the page buffers, and a control circuit configured to control whether the voltage generator supplies the sub-verification voltage and the target verification voltage in response to the sub-pass signal and the main pass signal. | 06-30-2011 |
20110158002 | SEMICONDUCTOR MEMORY DEVICE AND METHOD OF OPERATING THE SAME - A semiconductor memory device includes a memory string coupled between a common source line and a bit line, a page buffer configured to supply a first precharge voltage to the bit line and to latch data corresponding to a threshold voltage level of a memory cell of the memory string, wherein the data is detected according to a shift in a voltage of the bit line, in a precharge operation, a precharge circuit configured to supply a second precharge voltage to the common source line in the precharge operation, and a voltage supply circuit configured to generate operating voltages for turning on the memory string in the precharge operation. While the first precharge voltage is supplied from the page buffer to the bit line, the second precharge voltage is supplied to the bit line through the memory string. | 06-30-2011 |
20120008396 | SEMICONDUCTOR MEMORY DEVICE AND METHOD OF ERASING THE SAME - A semiconductor memory device includes memory cell blocks having physical pages coupled to memory cells, peripheral circuits configured to program the memory cells or read data stored in the memory cells, and a controller configured to control the peripheral circuits so that a pre-program is performed to make memory cells in the memory cell blocks have threshold voltages higher than a set voltage by programming memory cells of the selected memory cell block, having threshold voltages lower than the set voltage, in response to an erase command. The set voltage is an intermediate threshold voltage obtained from the threshold voltages of the memory cells of the selected memory cell block. | 01-12-2012 |
20120008407 | SEMICONDUCTOR MEMORY DEVICE AND METHOD OF PROGRAMMING THE SAME - A method of programming a semiconductor memory device includes a first program step for performing a program by supplying a first program voltage, having a specific amount, to a selected word line of the semiconductor memory device for a set time and a second program step for performing a program by supplying, to the selected word line, a second program voltage which is a step pulse gradually rising from a start voltage lower than the first program voltage. | 01-12-2012 |
20120008412 | NONVOLATILE MEMORY DEVICE AND METHOD OF ERASING THE SAME - A method of erasing a nonvolatile memory device includes the steps of supplying an erase voltage to the P well of a semiconductor substrate having a memory cell block disposed therein; performing a first erase verification operation for verifying the erase state of memory cells coupled to the even bit lines of the memory cell block; making a determination of success or failure for the first erase verification operation; and if, as a result of the determination for the first erase verification operation, all the memory cells coupled to the even bit lines are determined to be erased, performing a second erase verification operation for verifying the erase state of memory cells coupled to odd bit lines of the memory cell block. | 01-12-2012 |
20120140572 | SEMICONDUCTOR MEMORY DEVICE AND METHOD OF OPERATING THE SAME - A semiconductor memory device includes a switching element coupled between a power supply line and an output terminal of a power supply circuit for supplying a power supply voltage, wherein the switching element is configured to be turned on in response to a standby signal, a page buffer including a plurality of latch circuits, wherein a voltage input terminal of at least one of the latch circuits is coupled to the output terminal of the power supply circuit and a voltage input terminal of at least another one of the latch circuits is coupled to the power supply line, and a control logic circuit configured to generate the standby signal according to an operation mode of the semiconductor memory device. | 06-07-2012 |
20120268992 | SEMICONDUCTOR MEMORY DEVICE - A semiconductor memory device includes a memory cell array configured to include a plurality of memory blocks, a voltage generator configured to output operating voltages for data input and output to global lines, and a row decoder configured to transfer the operating voltages to local lines of a memory block, selected from among the plurality of memory blocks, and supply a ground voltage to local lines of unselected memory blocks in response to address signals. | 10-25-2012 |
20120275232 | SEMICONDUCTOR DEVICE AND ERASE METHODS THEREOF - An erase method of a semiconductor device includes performing an operation comprised of supplying an erase pulse to erase the memory cells of a memory block, performing an erase verify operation for detecting memory cells of the memory block having threshold voltages dropped to a target erase voltage, from among the memory cells, performing a pre-program operation on the memory cells having the threshold voltages dropped to the target erase voltage, if, as a result of the erase verify operation, the memory block comprises memory cells having the threshold voltages higher than the target erase voltage and the memory cells having the threshold voltages dropped to the target erase voltage, and repeating the operation of supplying an erase pulse, the erase verify operation, and the pre-program operation until the threshold voltages of all the memory cells drop to the target erase voltage. | 11-01-2012 |
20130003453 | SEMICONDUCTOR MEMORY DEVICE AND METHOD OF OPERATING THE SAME - A semiconductor memory device is operated by, inter alia: precharging a bit line, providing a first voltage to a coupling circuit for coupling the bit lines and cell strings of a plurality of memory cells, providing a program voltage to a selected word line coupled to a memory cell on which a program operation will be performed among the plurality of memory cells, providing a pass voltage to unselected word lines, providing a second voltage lower than the first voltage to the coupling circuit, discharging the bit line by loading program data, and providing a third voltage lower than the second voltage to the coupling circuit. | 01-03-2013 |
20130070529 | Semiconductor device and operating method thereof - A method of operating a semiconductor device includes programming one of a drain dummy cell and a source dummy cell which are included in a cell string; and coupling a bit line to the cell string in response to program states of the drain dummy cell and the source dummy cell and a voltage level applied to a drain dummy line coupled to a gate of the drain dummy cell and a source dummy line coupled to a gate of the source dummy cell. | 03-21-2013 |