Safety device for electrically programmable read-only memory
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United States of America Patent
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Mar 7, 1989
Grant Date -
N/A
app pub date -
May 21, 1987
filing date -
May 23, 1986
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A safety device for an electrically programmable read-only memory of the type comprising a matrix of memory cells, each comprising a floating gate MOS transistor that exhibits a defined threshold voltage after programming, each cell being accessible by rows and columns connected to means which can be used to apply, to these rows and columns, potentials representing the data to be recorded in the cells or potentials representing the command for reading the recorded data. This device comprises at least one reference memory cell included in the memory, the memory cell exhibiting a threshold voltage, after programming, which is lower than the minimum of the dispersal of threshold voltages of the transistors of the matrix.
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