5V tolerant PCI I/O buffer on 2.5V technology
US6005413A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 9, 1997 |
| Grant date | Dec 21, 1999 |
| Priority date | — |
| Expiry date | Sep 9, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K19/00315
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A tri-state input-output (I/O) buffer which includes a core terminal, a pad terminal and an enable terminal. A pad pull-down transistor and pad pull-up transistor are coupled to the pad terminal and have pull-up and pull-down control terminals, respectively. A pull-down control circuit is coupled between the core terminal and the pull-down control terminal. A pull-up control circuit is coupled between the core terminal and the pull-up control terminal. A feedback circuit is coupled between the pad terminal and the pull-up control terminal for sensing a first voltage on the pad terminal and adjusting a second voltage on the pull-up control terminal based on the sensed first voltage to reduce leakage current through the pull-up transistor when an enable signal received on the enable terminal is an inactive state.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.