Non-volatile storage device refresh time detector

Details Non-volatile storage device refresh time detector Non-volatile storage device refresh time detector

1997-02-18

1998-12-22

Fears, Terrell W.

Static information storage and retrieval

Read/write circuit

Data refresh

36518525, G11C 1300

Patent

active

058525823

ABSTRACT:
A 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 I.sub.DS current of the transistor and determines an array refresh time when more than a negligible amount of I.sub.DS current is detected.

REFERENCES:
patent: 3737879 (1973-06-01), Greene et al.
patent: 5347486 (1994-09-01), Urai

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