Abstract:
A nonvolatile memory system includes a nonvolatile memory device including a plurality of memory cells, and a memory controller. The memory controller is configured to count a clock to generate a current time, program dummy data at predetermined memory cells among the plurality of memory cells at a power-off state, detect a charge loss of the predetermined memory cells when a power-on state occurs after the power-off state, and restore the current time based on the detected charge loss.
Abstract:
An operating method of a memory controller controlling a nonvolatile memory device including a plurality of pages includes receiving a read request and a logical address from an additional device; determining a program state of an upper unselected word line of a selected word line corresponding to the received logical address; and transmitting a physical address corresponding to the logical address, state information, and a read command to the nonvolatile memory device according to a result of the determination in response to the read request, wherein the state information indicates a level of a first unselect read voltage the nonvolatile memory device is to apply to the upper unselected word line.
Abstract:
A soft-decision read method of a nonvolatile memory device includes receiving a soft-decision read command, applying a read voltage to a selected word line, pre-charging bit lines respectively connected to selected memory cells of the selected word line, continuously sensing states of the selected memory cells. The pre-charged voltages of the bit lines and the read voltage supplied to the selected word line are not varied during the sensing states of the selected memory cells.
Abstract:
Various example embodiments provide a flash memory device, comprising a cell string having a plurality of memory cells; a page buffer connected to the cell string and a bit line and configured to sense data stored in a selected memory cell from among the plurality of memory cells by precharging a sensing node connected to the bit line; and a voltage regulator providing a source voltage to the page buffer. The page buffer comprises a latch including first and second inverters coupled between a latch node and an inverted latch node; and a pull-down NMOS transistor for tripping the sensing result of the selected memory cell to the latch node. The voltage regulator adjusts a trip voltage by providing the source voltage to the pull-down NMOS transistor. The flash memory device according to the embodiment of the present invention may reduce a trip voltage variation range by using only the pull-down NMOS transistor characteristics. Also, according to the present invention, an OFF cell margin and an ON cell margin may be sufficiently secured by adjusting the level of the trip voltage Vtrip using the source voltage Vs.
Abstract:
A vertically-integrated nonvolatile memory device includes a peripheral circuit structure with a peripheral circuit therein, and cell array structure that is bonded to the peripheral circuit structure, and has a cell area and a connection area therein. The cell area includes a plurality of gate electrodes and a plurality of insulating layers alternately stacked, in the connection area. The plurality of gate electrodes include a cell stack having a staircase shape, a plurality of capacitor core contact structures configured to pass through the cell stack in the cell area, and a plurality of capacitor gate contact structures connected to the plurality of gate electrodes in the connection area. Each of the plurality of capacitor core contact structures includes: (i) a first core conductor electrically connected to the peripheral circuit, and (ii) a first cover insulating layer extending between the first core conductor and the plurality of gate electrodes, and constitutes a capacitor in which the first core conductor, the first cover insulating layer, and the plurality of gate electrodes are connected to the peripheral circuit.
Abstract:
The present disclosure provides serial-gate transistors and nonvolatile memory devices including serial-gate transistors. In some embodiments, a nonvolatile memory device includes a plurality of memory blocks, a plurality of pass transistor blocks, and a plurality of gates sequentially arranged in a horizontal direction in a gate region above a semiconductor substrate. Each of the plurality of pass transistor blocks includes a plurality of serial-gate transistors configured to transfer a plurality of driving signals to a corresponding memory block of the plurality of memory blocks. Each of the plurality of serial-gate transistors includes a first source-drain region, a gate region, and a second source-drain region that are sequentially arranged in a horizontal direction at a semiconductor substrate. The plurality of gates are electrically decoupled from each other. A plurality of block selection signals respectively applied to the plurality of gates are controlled independently of each other.
Abstract:
A method of programming a nonvolatile memory device comprises determining a temperature condition of the nonvolatile memory device, determining a program pulse period according to the temperature condition, supplying a program voltage to a selected word line using the program pulse period, and supplying a pass voltage to unselected word lines while supplying the program voltage to the selected word line.