Integratable solid state reset circuit operable over a wide temperature range
US5498987A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 20, 1994 |
| Grant date | Mar 12, 1996 |
| Priority date | — |
| Expiry date | Jun 20, 2014 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K17/223
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A reset circuit asserts, de-asserts and re-asserts a reset signal in response to a voltage applied between first and second nodes to which the reset circuit is connected. The reset signal includes a plurality of transistor switches connected together with positive feedback to achieve latching of the reset signal in either a high or a low state. The different inherent conductivity characteristics of the transistor switches causes the switches to begin closing when the applied voltage is at a first predetermined level and causes the transistor switches to begin opening when the applied voltage achieves a second predetermined lower level. The conductivity characteristics of the transistor switches cause the first and second predetermined levels to slightly vary over temperatures in the range of approximately -50.degree. C. to 150.degree. C., allowing reliable operation over a wide range of temperatures. The reset circuit may be integrated with the circuit which it resets.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.