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. 27, 2001
Filed:
Nov. 03, 2000
Masaru Yano, Sunnyvale, CA (US);
Fujitsu Limited, , JP;
Abstract
Disclosed are output drivers for integrated circuit chips which receive a second supply voltage VCCQ for driving signals off the chips. The output drivers according to the present invention can accept a wide range of voltage values for the second supply voltage VCCQ, and control their rise and fall slew times so that there is only a small variation in the slew times over a wide range of VCCQ values. The charging and discharging of the driver's pull-up and pull-down transistors is varied as a function of the second supply voltage VCCQ. In one set of embodiments, constructive discharge current branches and charging current branches are selectively activated depending upon the value of VCCQ. In other embodiments, counteracting discharge current branches and charging current branches are selectively activated depending upon the value of VCCQ. Drivers according to the present invention enable integrated circuits to be used with a wide variation of second supply voltages VCCQ while maintaining consistent slew times and low noise levels.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile