Data retention monitor

Static information storage and retrieval – Systems using particular element – Amorphous

Reexamination Certificate

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Details

C365S189070, C365S201000, C365S189060, C365S189150, C365S189160, C365S046000, C365S100000, C365S112000, C365S148000

Reexamination Certificate

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07864565

ABSTRACT:
A data retention monitor for a memory cell including a voltage source and a voltage comparator. The voltage source is adapted to provide a selectable voltage to the memory cell. The selectable voltage includes a read voltage and a test voltage, with the test voltage being greater than the read voltage. The voltage comparator is adapted to compare a voltage of the memory cell with a reference voltage after the provision of the selectable voltage to the memory cell. The memory cell retains data when the memory cell voltage generated at least in part by the test voltage is substantially equal to the reference voltage.

REFERENCES:
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patent: 6707737 (2004-03-01), Tanizaki
patent: 7042760 (2006-05-01), Hwang et al.
patent: 7336526 (2008-02-01), Osada et al.
patent: 7483305 (2009-01-01), Yamada
patent: 7534713 (2009-05-01), Lung
patent: 2006/0198183 (2006-09-01), Kawahara et al.
patent: 2006/0227591 (2006-10-01), Lowrey et al.
Pirovano et al., Reliability Study of Phase-Change Nonvolatile Memories, IEEE Transactions on Device and Materials Reliability, 2004; 4(3):422-427.

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