Power on reset circuit having hysteresis inverters
US5212412A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 26, 1992 |
| Grant date | May 18, 1993 |
| Priority date | — |
| Expiry date | Oct 26, 2012 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K17/22
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A power on reset circuit uses a first inverter with hysteresis operating in response to a first power supply potential to develop a first reset signal when the first power supply potential is greater than a first predetermined threshold. A second inverter with hysteresis also operates in response to the first power supply potential for developing a second reset signal when the first power supply potential is greater than a second predetermined threshold. The first reset signal disables the second inverter until the first power supply potential reaches the first predetermined threshold. A delay circuit delays the second reset signal to ensure the first power supply potential is fully operational before indicating a ready condition.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.