Logic gates with a programmable number of inputs
US5012135A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 12, 1989 |
| Grant date | Apr 30, 1991 |
| Priority date | — |
| Expiry date | May 12, 2009 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K19/1736
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
Apparatus for programming an OR gate, an AND gate or an EXCLUSIVE-OR gate to accept or not accept an input signal at an input terminal of the gate. The apparatus includes two pass transistors, a source of high or low voltage depending on the gate to be programmed, and a control signal that is used for programming the gates of the pass transistors. The two pass transistors may be of the same channel type i.e.,. both n-channel or both p-channel, or they may be of opposite channel types. This apparatus provides positive input signals from a group of input signals to avoid voltage signal ambiguities in programming the gates. Use of these programmable gates in combination in an AND-OR array is illustrated.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.