Nonvolatile semiconductor memory
US7554849B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 15, 2007 |
| Grant date | Jun 30, 2009 |
| Priority date | — |
| Expiry date | Nov 26, 2027 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11C2029/5004
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A nonvolatile semiconductor memory for setting control voltages to be supplied to an internal circuit, to an external reference voltage inputted from outside, has a parameter control circuit. The parameter control circuit causes a parameter register to sequentially output the plurality of parameters to a voltage generating control circuit. The parameter control circuit counts, for a fixed period of time, the number of oscillations of each of the trimming flag signals sequentially outputted from the voltage generating control circuit in response to the parameters. The parameter control circuit stores counted values corresponding to the parameters. The parameter control circuit selects the parameter having a maximum counted value as a parameter corresponding to the control voltage closest to the external reference voltage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.