Power off recovery in cross-point memory with threshold switching selectors

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United States of America Patent

PATENT NO 11501831
SERIAL NO

17090438

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Abstract

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In a memory array with a cross-point structure, at each cross-point junction a programmable resistive memory element, such as an MRAM memory cell, is connected in series with a threshold switching selector, such as an ovonic threshold switch. The threshold switching selector switches to a conducting state when a voltage above a threshold voltage is applied. When powered down for extended periods, the threshold voltage can drift upward. If the drift is excessive, this can make the memory cell difficult to access and can disturb stored data values when accessed. Techniques are presented to determine whether excessive voltage threshold drift may have occurred, including a read based test and a time based test.

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Patent Owner(s)

  • SANDISK TECHNOLOGIES LLC

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Grobis, Michael Campbell, US 23 30
Parkinson, Ward Boise, US 80 1354
Robertson, Neil Palo Alto, US 10 82

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