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:
May. 18, 2010
Filed:
Jul. 12, 2007
Mutsuo Kobayashi, Itami, JP;
Tsukasa Ooishi, Tokyo, JP;
Mutsuo Kobayashi, Itami, JP;
Tsukasa Ooishi, Tokyo, JP;
Renesas Technology Corp., Tokyo, JP;
Abstract
A semiconductor device includes a memory cell to and from which data is written and read in accordance with voltage supplied, a power supply circuit generating the voltage supplied to the memory cell, a microcomputer, an external terminal, a surge protection circuit clamping at a predetermined voltage value a voltage supplied to the external terminal, and a first switch circuit switching to output to one of the power supply circuit and the microcomputer a voltage having passed through the surge protection circuit. The power supply circuit includes a voltage conversion circuit changing the magnitude of a voltage received from the first switch circuit, and a second switch circuit switching to supply the memory cell with one of the voltage received from the first switch circuit and the voltage changed in magnitude.