Programmable drive circuit for I/O port
US6624661B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 15, 2002 |
| Grant date | Sep 23, 2003 |
| Priority date | — |
| Expiry date | Apr 15, 2022 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K19/018585
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
This specification discloses a programmable drive circuit for the I/O port. Using a logic circuit, the driver on the IC I/O port can be programmed to be an open-drained driver or a push-pull driver. In an embodiment of the invention, the programmable drive circuit contains a first transistor group and a second transistor group connected in series between a work voltage and a ground level. A first logic circuit controls the first transistor group, and a second logic circuit controls the second transistor group. The logic circuits are controlled by a select signal so that the first transistor group and the second transistor group become the open-drained driver or the push-pull driver.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.