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:
Jan. 05, 1988
Filed:
Mar. 14, 1986
Kenneth W Ouyang, Huntington Beach, CA (US);
Melvin Marmet, Norco, CA (US);
Western Digital Corporation, Irvine, CA (US);
Abstract
A power-up reset circuit for providing a reset signal for resetting circuit elements such as flip-flops upon the application of power to the circuit includes a CMOS pair output section and a capacitor coupled to the gates of the CMOS transistors. The capacitor is charged up by the power supply to switch the reset signal to a low level after the resetting operation has been achieved. In order to accommodate slow ramping power supplies, circuitry operating as a voltage sensitive switch is included to prevent the capacitor from charging until the power supply voltage has reached a sufficient level to ensure proper operation. In order to accommodate fast ramping power supplies, the charging rate of the capacitor is controlled to assure a minimum necessary duration of the reset signal.