Input or output selectable circuit pin
US5539338A · kind A · utility
6Cited by
7References
20Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Dec 1, 1994 |
| Grant date | Jul 23, 1996 |
| Priority date | — |
| Expiry date | Dec 1, 2014 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K19/1732
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A circuit for selecting between two states and using the same pin as an input and an output. On power-up, the pin can be connected to either a grounded resistor (to select the first state) or the power supply (to select the second state). The input signal generates a logic select signal. The logic select signal selects between first and second logic formats. If the first format is selected, the pin is used to output a reference voltage for that format. If the second format is selected, the logic select signal also provides a disable signal, that prevents the reference voltage output from appearing on the pin.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.