Method of detecting a light attack against a memory device...

Details Method of detecting a light attack against a memory device... Method of detecting a light attack against a memory device...

2008-10-09

2010-10-26

Pham, Ly D (Department: 2827)

Static information storage and retrieval

Floating gate

Particular biasing

C365S189080, C365S195000

Reexamination Certificate

active

07821841

ABSTRACT:
A memory device having a plurality of memory cells employs a method to detect a light attack on the memory device. The method utilizes at least one memory cell to detect a light attack when the memory cell is in an inactive state, and outputs a signal indicating whether a light attack is detected. In one case, the method includes turning off all of the memory cells of memory blocks of the memory device that are not currently being accessed for a read/write operation; sensing a leakage current of at least one of the memory cells of the memory blocks that are not currently being accessed for a read/write operation; and detecting a light attack on the memory device when a leakage current of the one of the memory cells of the memory blocks that are not currently being accessed for a read/write operation is greater than a threshold.

REFERENCES:
patent: 5550494 (1996-08-01), Sawada
patent: 2007/0217277 (2007-09-01), Kuenemund
patent: 2008/0135966 (2008-06-01), Kim
patent: 2008/0266989 (2008-10-01), Wood

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