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:
May. 16, 2000
Filed:
Apr. 28, 1998
Applicant:
Inventors:
Makeshwar Kothandaraman, Emmaus, PA (US);
Bernard Lee Morris, Emmaus, PA (US);
Bijit Thakorbhai Patel, Breinigsville, PA (US);
Wayne E Werner, Coopersburg, PA (US);
Assignee:
Lucent Technologies, Inc., Murray Hill, NJ (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H03K / ; H03K / ; H03K / ;
U.S. Cl.
CPC ...
326 83 ; 326 80 ; 326 81 ; 326 86 ; 326 30 ; 326 21 ; 326 34 ;
Abstract
A low voltage CMOS input buffer protection circuit that is used to protect an input buffer from any high voltage signal (e.g., 5 V) that may appear along a signal bus. The protection circuit is also 'hot-pluggable', meaning that the protection circuit will not draw any current when not powered (i.e., when VDD is not present). The circuit includes a CMOS transmission gate and utilizes on-chip generated reference voltages to provide the necessary protection.