Pseudo-nonvolatile memory incorporating data refresh operation
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United States of America Patent
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Apr 23, 1996
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app pub date -
Nov 23, 1993
filing date -
Nov 23, 1993
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Abstract
A pseudo nonvolatile memory cell which may be operated in a pseudo-nonvolatile mode is achieved by utilizing a thin direct tunneling dielectric adjacent to the charge retaining region in a traditional nonvolatile memory cell such as an EPROM, EEPROM, flash EPROM, or flash EEPROM cell. The use of the direct tunneling dielectric allows for greatly enhanced write/erase cycles (exceeding 100 gigacycles) and reduced data write/erase time (under 1 microsecond). The direct tunneling dielectric also results in a reduced data retention period. Consequently, refresh circuitry is provided to maintain the non-volatility of the memory cell. A back-up battery is used to power the refresh circuitry when the system power is removed. This mode of operation provides an effectively nonvolatile memory system that is suitable for replacing traditional nonvolatile memory devices.
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