Semiconductor device
US6731558B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 5, 2002 |
| Grant date | May 4, 2004 |
| Priority date | — |
| Expiry date | Aug 5, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11C11/406
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A bias voltage having a positive temperature dependency is supplied to a current source that determines the operating current of a refresh timer that issues a refresh request to allow the driving current of the current source to have a positive temperature characteristic. In this manner, the refresh cycle of the refresh timer shortens the issue intervals when the temperature rises, and lengthens the issue intervals of the refresh request when the temperature decreases. Thus, the consumed current for the refresh at room temperature is reduced. Consequently, the consumed current in a self-refresh mode under the room temperature condition can be reduced.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.