Patent ID: 7372754

Claim:
A nonvolatile memory device, comprising: a nonvolatile memory cell array including a plurality of nonvolatile memory cells connected to a plurality of word lines; and a word line voltage generator configured to generate first and second sequences of voltage pulses, and to selectively supply one of the first and second sequences of voltage pulses to a selected one of the word lines to program the nonvolatile memory cells connected to the selected word line, wherein a slope of at least one voltage pulse of the first sequence of voltage pulses is greater than a slope of at least one voltage pulse of the second sequence of voltage pulses, wherein the word line voltage generator supplies the first sequence of voltage pulses when the selected word line belongs to a first set of one of more of the plurality of word lines, and wherein the word line voltage generator supplies the second sequence of voltage pulses when the selected word line belongs to a second set of one of more of the plurality of word lines.