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:
Dec. 28, 1993
Filed:
Jun. 01, 1990
Christopher M Hall, Redwood City, CA (US);
National Semiconductor Corporation, Santa Clara, CA (US);
Abstract
An EPROM register is programmed in a manner substantially similar to the manner used to program a main EPROM array contained on the same integrated circuit. Data in the main EPROM array must be read out by applying appropriate address and output enable signals. The EPROM register allows the data stored therein to be available at all times by providing a full-time static output signal. The register includes a static evaluation circuit for determining the data stored in the register, a precharge keeper circuit for providing a pseudo-static evaluation of the data, as well as providing a periodic refresh of the sense node during pseudo-static evaluation, and a margin test circuit for testing the threshold voltage of the register, as well as actual or relative shifts in the threshold voltage. The EPROM register serves as a nonvolatile memory which can be written to store configuration information for an integrated circuit.