Output buffer having programmable drive current
US4855623A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 5, 1987 |
| Grant date | Aug 8, 1989 |
| Priority date | — |
| Expiry date | Nov 5, 2007 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K19/018585
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
The specification discloses output buffer circuitry (10) for providing selected output driving characteristics. A plurality of input terminals (13, 24 and 30) receive control and data signals. A plurality of interconnected driver transistors (20, 28, 36 and 42) are connected to an output terminal (22). Drive selector circuitry (16, 18, 38 and 40) is connected between the input terminals (13, 24, and 30) and is responsive to the control signals to vary the electrical interconnection of the driver transistors (20, 28, 36 and 42). The output driving characteristics presented to the output terminal (22) are variable in response to the control signals.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.