04503538 is referenced by 97 patents and cites 3 patents.

To recognize change in the storage characteristics of programmable memory elements, particularly EPROMs, the memory content of an addressed memory element or cell is read out, the first time, at normal design voltage level; the data so read are then again read out at a changed voltage level, for example at a higher or lower read-out voltage, or higher or lower operating voltage of the EPROM, and compared. If the data do not match, the particular memory cell will have the tendency to become defective due to loss or accumulation of charge carriers in due course although, for some time yet, the specific memory cell will function satisfactorily. Detection of errors upon operation under changed voltage conditions provides early warning of failure of a cell.

Title
Method and system to recognize change in the storage characteristics of a programmable memory
Application Number
6/390291
Publication Number
4503538
Application Date
June 21, 1982
Publication Date
March 5, 1985
Inventor
Eberhard Fritz
Schwieberdingen
DE
Agent
Frishauf Holtz Goodman & Woodward
Assignee
Robert Bosch
DE
IPC
G01R 31/28
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