Noise resistant low voltage brownout detector with shut off option
US5187389A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 3, 1991 |
| Grant date | Feb 16, 1993 |
| Priority date | — |
| Expiry date | May 3, 2011 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K2217/0036
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
An integrated circuit which will produce a switched output when the circuit power supply drops a predetermined level below which reliable IC operation is not assured. This reduced power supply condition is referred to as brownout wherein the switching is related to the active devices. A preferred CMOS circuit is disclosed. The switching level is related to the N channel and P channel transistor sum of thresholds which makes the CMOS circuit process adaptive. The circuit is provided with a transistor gate oxide capacitor for improving noise immunity while achieving maximum utilization of IC chip area. In addition, output enable and circuit shutdown capabilities are detailed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.