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:
Jun. 23, 1992
Filed:
Jan. 16, 1991
Other;
Abstract
An output buffer circuit is provided for use with a first external voltage which provides voltage at a first level, the output buffer circuit comprising: an output terminal; a second voltage supply for providing voltage at a second level less than the first level; an n-channel pull-up transistor including a drain coupled to the first voltage supply and including a source coupled to the output terminal; a p-channel pull-up transistor including a drain coupled to the output terminal and a source coupled to the second voltage supply; an n-channel pull-down transistor including a drain coupled to the output terminal; a bootstrapping turn-on circuit for raising a gate of the n-channel pull-up transistor to a raised voltage level which is above the first voltage level such that the n-channel pull-up transistor becomes turned on; a turn-off circuit for turning off the n-channel pull-up transistor when the output terminal has been substantially pulled up to the second voltage level; and a turn-on circuit for turning on the p-channel pull-up transistor when the output voltage at the output terminal has been substantially pulled up to the second level.