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. 12, 1993
Filed:
Nov. 05, 1990
Donald G Tipon, San Diego, CA (US);
NCR Corporation, Dayton, OH (US);
Abstract
In a high speed digital computer data transfer system, a data bus driver reduces data bus voltage swings between logic high and logic low levels by defining minimum and maximum bus voltages which lie between said logic levels, thus lowering bus transition and hence data transfer times. Positive and negative overshoot of the reduced bus logic levels are prevented by 'clamping diode' transistors. The data bus driver assumes a tri-state mode when not transmitting data, during which the clamping diode transistors also eliminate positive and negative bus voltage overshoot. The preferred embodiment is implemented using complementary metal-oxide-semiconductor (CMOS) technology.