Level shifting circuitry
US8680912B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jul 17, 2012 |
| Grant date | Mar 25, 2014 |
| Priority date | — |
| Expiry date | Sep 11, 2032 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K19/018507
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
Level shifting circuitry is provided for generating an output signal in response to an input signal. The level shifting circuitry includes a pulldown path for pulling the output signal to a lower output voltage level in response to a first transition of the input signal and a pullup path for pulling the output signal to a higher output voltage level in response to a second transition of the input signal. Pullup control circuitry places the pullup path in a non-conductive state in response to the output signal being pulled to the higher output voltage level. A keeper path keeps the output signal at the higher output voltage level while the pullup path is non-conductive until the pulldown path pulls the output signal low. A maximum drive current of the pulldown path is greater than a maximum drive current of the keeper path.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.