HCU_HCT_BASED_OSCILLATOR

Published:2009/7/9 1:33:00 Author:May | From:SeekIC

When frequency stability is not of prime importance, a simple, yet retable, digital clock oscillator can be made with the aid of relatively few components. High-speed CMOS (HCU/HCT) inverters or gates with an inverter function are eminently suitable to make such oscillators, thanks to their low power con-sumption, good output signal definition, and extensive frequency range. The circuit as shown uses two inverters in a 74HCT04 or 74HCU04. The basic design equations are: With RS and R calculated for a given frequency and value of C, both resistors can be realized as presets to enable precise setting of the output frequency and the duty factor. Do not forget, however, to fit small series resistors in series with the presets, in observance of the minimum values for R and RS as given in the design equations. The values quoted for IC are only valid if the inputs of the remaining gates are g fillnded.



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