Nonvolatile semiconductor memory device capable of uniformly inputting/outputting data
US7173857B2 · kind B2 · utility
409Cited by
19References
4Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 25, 2005 |
| Grant date | Feb 6, 2007 |
| Priority date | — |
| Expiry date | Jan 25, 2025 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11C2211/5634
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
At the time of an operation of writing data to a specific memory cell in a memory block, a semiconductor memory device applies a write voltage for a predetermined period and, after that, performs a verifying operation by using a sense amplifier circuit and a comparator. When it is found as a result of the verifying operation that writing to the memory cell is insufficient, the writing operation is performed again by an instruction of a memory control circuit. At this time, the memory control circuit adjusts a write voltage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.