Active bit-line clamp circuit for flat cell structure of mask read-only memory
US5475637A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 27, 1994 |
| Grant date | Dec 12, 1995 |
| Priority date | — |
| Expiry date | Dec 27, 2014 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11C17/126
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A mask ROM device having active bit-line clamp circuits which employ a voltage-to-current converter as the clamp circuit for selectively coupling a main bit line of the ROM memory device to a selected one of virtual ground lines. The voltage-to-current converter is selectively coupled between the main bit line and a first or second virtual ground line for clamping therebetween. The voltage-to-current converter converts the voltage difference between the coupled main bit line and the selected first or second virtual ground line into a corresponding current in proportion to a voltage difference, the converted current being coupled to the selected first or second virtual ground line.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.