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NON-VOLATILE SEMICONDUCTOR MEMORY DEVICE

  • US 20080205119A1
  • Filed: 12/10/2007
  • Published: 08/28/2008
  • Est. Priority Date: 02/28/2007
  • Status: Active Grant
First Claim
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1. A non-volatile semiconductor memory device comprising:

  • a cross-point cell array;

    a plurality of word lines extended in a first direction;

    a plurality of bit lines extended in a second direction different from the first direction;

    a first decoding circuit for selecting a selected word line from the plurality of word lines;

    a second decoding circuit for selecting a selected bit line from the plurality of bit lines;

    a first reference signal generating circuit for generating a first reference signal;

    a second reference signal generating circuit for generating a second reference signal different from the first reference signal; and

    a read circuit,wherein the cross-point cell array includes a plurality of cells,each of the plurality of cells is interposed between one of the plurality of word lines and one of the plurality of bit lines,a selected cell is interposed between the selected word line and the selected bit line,based on a detection signal corresponding to a detection current which is caused to flow through the selected bit line by applying a voltage between the selected word line and the selected bit line, the read circuit compares a first difference signal corresponding to a difference between the detection signal and the first reference signal with a second difference signal corresponding to a difference between the detection signal and the second reference signal, thereby determining data stored in the selected cell.

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