Patent ID: 7349250
Filing Date: 2008-03-25
Classification: G11C,H01L

Abstract:
1. A semiconductor device having multiple nonvolatile memory elements in which first gate electrodes are provided on a main surface of a semiconductor substrate via a charge-storage film, a first nonvolatile memory cell comprising one nonvolatile memory element of the multiple nonvolatile memory elements, and a second nonvolatile memory cell comprising at least two nonvolatile memory elements of the multiple nonvolatile memory elements, wherein a rewriting frequency of the second nonvolatile memory cell is greater than a rewriting frequency of the first nonvolatile memory cell, wherein, in the first nonvolatile memory cell, one bit is formed from the one nonvolatile memory element, and wherein, in the second nonvolatile memory cell, one bit is formed from the at least two nonvolatile memory elements.