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. 11, 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 / ;
U.S. Cl.
CPC ...
326 83 ;
Abstract
A CMOS high voltage drive output buffer that protects the drive stage from seeing relatively high voltages (e.g., 5 V) during 'hot pluggable' conditions (that is, when the reference voltage VDD is not present). A transmission gate and clamping transistors are disposed around the output devices to provide the requisite protection. A backgate bias generator for use with P-channel devices is also disclosed that is capable of withstanding 'hot pluggable' conditions.