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. 13, 1995
Filed:
Dec. 10, 1993
Applicant:
Inventors:
Mark R Sikkink, Chippewa Falls, WI (US);
Terrance L Bowman, Altoona, WI (US);
Assignee:
Cray Research, Inc., Eagan, MN (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H03K / ;
U.S. Cl.
CPC ...
326 77 ; 326 66 ; 326126 ;
Abstract
A level shifting circuit which can be implemented as part of a bipolar ECL integrated circuit, provides reliable switching and level shifted output suitable for driving a low voltage CMOS integrated circuit. The circuit includes a level shifting circuit which is connected to trigger a high gain positive feedback bootstrap circuit to reliably ensure switching even under poor signal conditions. An output taken from one of the switched pair is allowed to go to V.sub.CC, 0 volts, or is clamped by a clamping circuit to -3.3 volts, representing the two output states suitable for driving inverted rail CMOS circuitry.