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:
Aug. 09, 1983
Filed:
Jun. 15, 1981
William D Atwell, Jr, Austin, TX (US);
Marc Belleville, Austin, TX (US);
Motorola, Inc., Schaumburg, IL (US);
Abstract
A circuit for switching between multiple asynchronous clocks is provided. A synchronizer comprising D-type flip-flops, which are controlled by a clock change signal, are provided for each control signal being switched. Output signals provided by the synchronizers are used to control MOS transistor gates which switch the asynchronous clocks to the circuit output. The synchronizers also control a clamping transistor gate which clamps the circuit output to a reference during a switching operation. An additional synchronizer provides synchronization between the clock change signal and the circuit output allowing the circuit output to be interrupted at a known state.