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. 31, 2005
Filed:
Jan. 09, 2003
Kanji Natori, Fujimi-machi, JP;
Kanji Natori, Fujimi-machi, JP;
Seiko Epson Corporation, Tokyo, JP;
Abstract
A detection circuit detects a rising time period between a power supply ON time or a reset time and a time when a boosted voltage reaches a standby voltage, and outputs a detection signal representing a result of the detection. An oscillation circuit generates an outputs a clock signal having a constant frequency which is lower than a frequency in an ordinary state, while the detection signal is at a high level. A charge pump circuit boosts a power source voltage in response to the input clock signal of the constant frequency and causes the boosted voltage to gently rise from the power source voltage, thereby effectively interfering with an increase in reference voltage accompanied by the increase in boosted voltage.