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:
Dec. 06, 2005
Filed:
Apr. 07, 2004
Mark E. Anderson, Ii, New York, NY (US);
Sundar K. Iyer, Beacon, NY (US);
Chandrasekara Kothandaraman, Hopewell Junction, NY (US);
Edward P. Maciejewski, Wappingers Falls, NY (US);
George E. Smith, Iii, Wappingers Falls, NY (US);
Mark E. Anderson, II, New York, NY (US);
Sundar K. Iyer, Beacon, NY (US);
Chandrasekara Kothandaraman, Hopewell Junction, NY (US);
Edward P. Maciejewski, Wappingers Falls, NY (US);
George E. Smith, III, Wappingers Falls, NY (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
An identification circuit for establishing and sensing the state of a fusible element used in on chip identification of the chip's type comprising: a circuit establishing control signals for turning the identification circuit on and off; dual paths energized by the control signals generated by the level setting circuit to energize one path through the fusible element to provide a state level and the other path through a reference path which provides a reference voltage level which is distinguishable from both the blown and unblown states of the fusible element; a differential sensing circuit for comparing the reference voltage level to the state level to provide a signal indicating the state of the fusible element; and protection circuitry to protect the circuit during an operation in which the state of the fusible element is set.