Secondary clock source for low power, fast response clocking

摘要

An integrated digital logic circuit includes a free-running secondary clock oscillator for generating free-running clocking pulses and a frequency-stabilized master oscillator for generating primary clocking pulses. A clock signal selector selects and puts out either the secondary clocking pulses or the primary clocking pulses depending upon integrated circuit operations/applications. A method for rapidly generating clocking signals during an integrated circuit start-up interval is also described.