5 volt CMOS driver circuit for driving 3.3 volt line
US5786720A · kind A · utility
5Cited by
35References
7Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 22, 1994 |
| Grant date | Jul 28, 1998 |
| Priority date | — |
| Expiry date | Sep 22, 2014 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K19/018521
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A driver circuit that is powered by a power supply voltage has an output terminal, and includes a pull-up transistor for pulling the output terminal up toward the power supply voltage. A voltage divider that is connected across the power supply voltage has a tap connected in circuit to an input of the pull-up transistor and includes variable resistance elements whose resistance varies together with a threshold voltage of the pull-up transistor for limiting a voltage at the output terminal to within a predetermined range that is lower than the power supply voltage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.