Refresh apparatus for semiconductor memory device, and refresh method thereof
US6731560B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 6, 2002 |
| Grant date | May 4, 2004 |
| Priority date | — |
| Expiry date | Dec 6, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11C2029/1802
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A refresh apparatus for a semiconductor memory device and a refresh method thereof that can reduce a test time by simultaneously refreshing a normal cell and a redundant cell in one test mode is disclosed. The refresh apparatus for the semiconductor memory device may include a redundant cell refresh signal generator for generating a redundant cell refresh signal for refreshing a redundant cell when a refresh is requested in a test mode, a wordline enable signal generator for generating a normal main wordline enable signal and a redundant main wordline enable signal in response to the redundant cell refresh signal in a redundant cell test mode and a wordline driver for simultaneously refreshing the normal and redundant cells by simultaneously driving a normal main wordline and a redundant main wordline in response to the redundant cell refresh signal, the normal main wordline enable signal, the redundant main wordline enable signal and a row address in the redundant cell test mode.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.