Patent ID: 8582365
Filing Date: 2013-11-12
Classification: G11C

Abstract:
1. A method of operating a non-volatile memory device, comprising: during a read operation directed to a nonvolatile memory cell having a positive threshold voltage and being connected between a selected word line and a selected bit line, applying a positive read voltage to the selected word line and a first control signal to a page buffer connected to the selected bit line, wherein the first control signal defines a first read operation interval comprising a first discharge interval, a first pre-charge interval, a first developing interval, and a first sensing interval; and during a read operation directed to the memory cell having a negative threshold voltage, applying a negative read voltage to the selected word line and a second control signal to the page buffer different from the first control signal, wherein the second control signal defines a second read operation interval longer in duration than the first read operation interval and comprising a second discharge interval, a second pre-charge interval, a second developing interval, and a second sensing interval.