The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 30, 2004
Filed:
Nov. 30, 2001
Timothy E. Fiscus, South Burlington, VT (US);
Cypress Semiconductor Corp., San Jose, CA (US);
Abstract
An apparatus comprising an array of memory cells, a refresh circuit, a first monitor cell, a second monitor cell, and a control circuit. The refresh circuit may be configured to refresh the array of memory cells in response to a refresh control signal. The first monitor cell may be configured to have a charge leakage similar to the memory cells. The second monitor cell may be configured to have a discharge leakage similar to the memory cells. The control circuit may be configured to generate the refresh control signal in response to either a voltage level of the first monitor cell rising above a first pre-determined threshold level or a voltage level of the second monitor cell dropping below a second pre-determined threshold level, where the first and second threshold levels are different.