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:
Jul. 27, 1993
Filed:
Sep. 13, 1991
Richard R Rasmussen, Fremont, CA (US);
National Semiconductor Corporation, Santa Clara, CA (US);
Abstract
Circuit and method of glitchless switching between asynchronous data inputs to a digital multiplexer (MUX) by maintaining and conditioning the width of the clock pulse corresponding to a first data input signal so that an output pulse is produced having a pulse width that is never narrower than the narrowest of input signals, i.e., does not produce a narrow-pulse glitch. The circuit comprises select inputs in parallel to both a MUX via a select latch device and to an edge detector having an output pulse triggering a synchronization assembly. The synchronization assembly freezes the output in the last state received from the multiplexer. The select input edge detector freezes the original D0 input at a high state until the new input D1 is cleared through the synchronization assembly.