Semiconductor memory device with built-in accessing system for redundant information less affecting data access speed in standard mode
US5535161A · kind A · utility
33Cited by
3References
6Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Oct 5, 1994 |
| Grant date | Jul 9, 1996 |
| Priority date | — |
| Expiry date | Oct 5, 2014 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11C29/84
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A semiconductor memory device replaces defective regular memory cells with redundant memory cells upon discrimination of an access to the defective regular memory cells. A redundant data accessing unit controls sense amplifiers to produce an information signal indicative of the address of the defective regular memory cell. A redundancy circuit for storing the address allows an output circuit to output the information signal when external address bits are indicative of the address of the defective regular memory cell, thereby making the circuit arrangement simple.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.