CMOS power-on reset circuit
US5039875A · kind A · utility
53Cited by
4References
9Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Nov 28, 1989 |
| Grant date | Aug 13, 1991 |
| Priority date | — |
| Expiry date | Nov 28, 2009 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K17/223
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A power-on reset circuit. The reset circuit provides an automatic reset pulse immediately after power-up. The supply voltage is provided to the reset circuit. An RC filter with a variable time constant provides a "hump" waveform which is coupled to a waveform shaper. The waveform shaper converts the hump voltage output from the RC filter into a reset signal. Latching mechanisms are included to prevent refiring of the reset signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.