US Patent 7325089 Controller for refreshing memories

Patent 7325089 was granted and assigned to Micron Technology on January, 2008 by the United States Patent and Trademark Office.

Overview Structured Data Issues Contributors Activity

Is a

Patent

Patent attributes

Current Assignee

Micron Technology

Patent Jurisdiction

United States Patent and Trademark Office

Patent Number

7325089

Date of Patent

January 29, 2008

Patent Application Number

11062768

Date Filed

February 22, 2005

Patent Primary Examiner

‌

Woo H. Choi

Patent abstract

A memory utilizes a data refresh algorithm to preserve data integrity over disturbances caused by memory programming or erase operations. The memory device maintains a counter for each memory block or sector. When a memory block or sector is erased or programmed, the associated counter is set to a predetermined value while other counters are incremented or decremented. Whenever a counter reaches a predetermined threshold value, the associated block or sector is refreshed. The threshold value is set to ensure that each block or sector is refreshed before data integrity is adversely affected by disturbances caused by repeated programming and erase operations.