Input/output circuit with programmable input sensing time
US5029272A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 3, 1989 |
| Grant date | Jul 2, 1991 |
| Priority date | — |
| Expiry date | Nov 3, 2009 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K2005/00293
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
An input/output circuit of an integrated circuit with a programmable input sensing time. The output driver of the input/output circuit is open drain and is designed for use in a wire-OR configuration with other devices. The input/output circuit is coupled to a bonding pad and through the bonding pad to a device pin, and counts a programmable number of clock cycles between a negation of an output drive signal and when the state of the pin is sampled as an input. Since different applications use a wide range of values for external pullup resistors, the input/output circuit allows adjustment of the sample time to fit a particular application.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.