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:
Oct. 05, 1999
Filed:
Apr. 10, 1998
Tuong Hai Hoang, San Jose, CA (US);
National Semiconductor Corporation, Santa Clara, CA (US);
Abstract
A logic circuit for providing hysteresis in the sensing of the temperature of an integrated circuit includes two voltage comparators and a D-type flip-flop. Each of the comparators compares a reference voltage and a respective one of two voltage signals which represent and vary in respective relations to the temperature of the integrated circuit. The resulting binary output signals of the comparators are asserted and de-asserted at different approximate temperatures, i.e., with one being higher and the other being lower with respect to one another. One comparator output signal serves as both the input data signal and output clear control signal for the flip-flop while the other serves as the clock signal. Accordingly, the output signal of the flip-flop is asserted during a time which follows an increase in the measured temperature above the higher approximate temperature value and precedes a decrease in the measured temperature below the lower approximate temperature value.