Protection circuit for non-volatile memory
US5163025A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 16, 1990 |
| Grant date | Nov 10, 1992 |
| Priority date | — |
| Expiry date | Nov 16, 2010 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11C5/142
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A reset control circuit for an EAROM includes a zener diode coupled across the input of a voltage regulator which supplies operating voltage for the EAROM. The breakdown voltage of the zener diode is greater than the output voltage of the regulator. During turn-on, the reset voltage, which is taken from the zener diode, is held below the low point of its active region until the operating voltage has been established. During turn-off, the operating voltage is maintained until the reset voltage has become inactive, i.e. has dropped below its reset low voltage. The sequencing of operating voltage and reset voltage protects the data in the EAROM.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.