Semiconductor memory device
US5267205A · kind A · utility
14Cited by
5References
2Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Dec 26, 1990 |
| Grant date | Nov 30, 1993 |
| Priority date | — |
| Expiry date | Dec 26, 2010 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11C7/062
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A semiconductor memory device with a redundant configuration according to the present invention includes a roll call circuit which turns an output signal of a sense amplifier compulsorily to a signal of a predetermined logical level when a portion constituting the redundant configuration is accessed, and turns an output signal of the output control circuit to that of the same predetermined logical level when a write instruction is given outside a normal level. Whether a spare memory cell is accessed can be checked in every output and the redundant configuration can operate with stability.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.