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. 29, 2005
Filed:
May. 20, 2003
Takao Watanabe, Kokubunji, JP;
Ryoichi Hori, Tokyo, JP;
Goro Kitsukawa, Tokyo, JP;
Yoshiki Kawajiri, Hachioji, JP;
Takayuki Kawahara, Kokubunji, JP;
Kiyoo Itoh, Higashikurume, JP;
Takao Watanabe, Kokubunji, JP;
Ryoichi Hori, Tokyo, JP;
Goro Kitsukawa, Tokyo, JP;
Yoshiki Kawajiri, Hachioji, JP;
Takayuki Kawahara, Kokubunji, JP;
Kiyoo Itoh, Higashikurume, JP;
Renesas Technology Corporation, Tokyo, JP;
Abstract
A semiconductor integrated circuit comprises a semiconductor chip, a power supply terminal provided on the semiconductor chip for receiving a voltage from an external power supply source, an internal circuit provided on the semiconductor chip, a power supply circuit provided on the semiconductor chip for transforming an external power supply voltage received from the power supply terminal for supplying a source voltage resulting from the voltage transformation to the internal circuit, and a control circuit provided on the semiconductor chip for controlling the power supply circuit, wherein the control circuit includes external power supply voltage detecting means and/or temperature detecting means and responds to the signal from the external power supply voltage detecting means and/or the temperature detecting means by changing the power supply voltage to the internal circuit to thereby maintain the operating speed of the internal circuit to be constant.