Non-volatile storage device refresh time detector
Patent 5852582 Issued on December 22, 1998. Estimated Expiration Date: 
February 18, 2017. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
February 18, 2017. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3737879 Nonvolatile memory device having self-refresh function Patent #: 5347486 InventorsAssigneeApplicationNo. 801305 filed on 02/18/1997US Classes:365/222, Data refresh365/185.25Line charging (e.g., precharge, discharge, refresh)ExaminersPrimary: Fears, Terrell W.Attorney, Agent or FirmInternational ClassG11C 013/00AbstractA timing apparatus for monitoring when a memory array in a non-volatile storage device needs to be refreshed includes a programmable semiconductor device and detecting means for detecting when the amount of charge on the programmable semiconductor device has diminished to at most a threshold amount. In one embodiment, the programmable semiconductor device is a floating gate transistor programmed by adding charge to the floating gate. The detecting means monitors the IDS current of the transistor and determines an array refresh time when more than a negligible amount of IDS current is detected. | |
