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:
Nov. 25, 1997
Filed:
Jul. 17, 1995
Hidenori Yato, Suwa, JP;
Seiko Epson Corporation, Tokyo, JP;
Abstract
A semiconductor device, microcomputer, or electronic equipment capable of switching internal power voltages in order to suppress the power consumption thereof can prevent erroneous operation of the internal circuitry by switching the level of the internal power voltage in a stepwise manner. A constant-voltage circuit that causes the generation of power voltages is capable of generating voltages of at least three levels. During the switching of the power voltages, a control circuit implements stepwise switching of the power voltages by causing the sequential output of the voltages in increasing or decreasing order of absolute value. Immediately after a switch of power voltage, the level of the signal on the signal line is determined to be at the same level as that before the switching even if a potential change in a signal line is delayed by more than a change in the threshold voltage of a digital circuit, and thus erroneous recognition of data, or rather data inversion, is prevented. This improves the reliability of the device.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile