Abstract:
A variable resistance non-volatile memory device includes a variable resistance memory cell array and an input/output circuit for inputting writing data from the outside or outputting reading data. The memory device includes an encoder for generating the writing data as DC balance code data and a writing circuit for writing the DC balance code data to the memory cell array. The memory device includes a sensing circuit for sensing the stored data from the memory cell array and a decoder for recovering the reading data offered to the input/output circuit by decoding the DC balance code data. The sensing circuit compares the average current of cell lead currents with each cell lead current. When the average current is bigger than a cell lead current, the sensing circuit senses a reset state. When the average current is smaller than the cell lead current, the sensing circuit senses a set state. The present invention reduces the impact of changes in cell resistance, which is generated by time, by using the average current of a DC balance state.
Abstract:
PURPOSE: A resistive memory device, an operating method thereof, and a memory system including the same improve the distribution of a memory cell by blocking current flowing through the memory cell. CONSTITUTION: A memory cell array (10) includes multiple resistive memory cells (11-1-11-k). A write driver supplies a predetermined current to the resistive memory cells corresponding to multiple local bit lines through multiple global bit lines, respectively. Multiple first switches connect multiple word lines to a ground line in response to a first switch control signal. Multiple second switches connect the global bit lines to the local bit lines in response to a second switch control signal.
Abstract:
PURPOSE: A write signal generating circuit, a variable resistance memory device including the same, and a driving method thereof are provided to improve data write performance by minimizing the setup time of a write current. CONSTITUTION: A pre-emphasis signal generating circuit(160) receives the location information of a program target memory cell and generates a pre-emphasis signal according to the location information of the program target memory cell. A write driver(130) generates a program signal corresponding to data programmed in the program target memory cell. The write driver generates a write signal by adding the program signal to the pre-emphasis signal from the pre-emphasis signal generating circuit and outputs the write signal to the program target memory cell.
Abstract:
PURPOSE: A memory device, a precharge controlling method thereof, and apparatuses including the same are provided to reduce RC delay of a global bit line by arranging a precharge circuit between sub arrays. CONSTITUTION: A memory cell array includes a plurality of sub arrays(21-1,21-2). One or more first precharge circuits(22-1,22-2) are formed in the memory cell array. At least one first precharge circuit precharges the selected global bit line with the first precharge voltage. A second precharge circuit(24) is formed outside the memory cell array and precharges the selected global bit line with a second precharge voltage.