Integrated circuits with persistent data storage
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United States of America Patent
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Jun 15, 2010
Grant Date -
N/A
app pub date -
Oct 31, 2005
filing date -
May 31, 2001
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The circuitry introduced in this invention selectively slows down the functioning of an electronic circuit by maintaining a particular state for a prolonged period of time. This circuitry is used not only to achieve the desired effect in maintaining security from electronic thieves trying to circumvent codes but also in other applications such as enabling a circuit to continue to function in the event of a brief loss of power. For example, in an RFD system, if a reader is frequency hopping, a tag loses power for as long as about 400 milliseconds when the reader changes to other frequencies. In a preferred embodiment, the disclosed circuitry is used in conjunction with a destruct sequence.
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