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:
Mar. 23, 2004
Filed:
Jul. 26, 2002
Takuya Ishida, Hyogo, JP;
Jun Setogawa, Hyogo, JP;
Renesas Technology Corp., Tokyo, JP;
Abstract
The output of a ring oscillator that receives an internal power supply potential as an operating power supply potential to conduct an oscillation operation is counted by a counter that receives an external power supply potential as an operating power supply potential, and reset is canceled. The circuit that operates with an internal power supply potential can be reliably reset even when the rise of the internal power supply potential is delayed. By adjusting the number of stages of the inverter of a ring oscillator and the number of bits of the counter, the power-on reset time can be adjusted while suppressing increase of the area. An appropriate power-on reset signal can be generated to prevent erroneous operation even in the case where the rise of the internal power supply potential lags behind the rise of the external power supply potential.