Semiconductor device
US6172537A · kind A · utility
49Cited by
3References
5Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 6, 1999 |
| Grant date | Jan 9, 2001 |
| Priority date | — |
| Expiry date | Apr 6, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03L7/0816
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A semiconductor device has a DLL circuit or the like for adjusting the phase of an external clock and producing an internal clock that lags behind by a given phase. The semiconductor device further includes a clock frequency judging unit for judging the frequency of a first clock on the basis of an indication signal indicating a delay value of the first clock in the DLL circuit or the like to output a control signal; and a clock selecting unit for selecting either one of the first clock and the second clock, in response to the control signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.