Fairchild CMOS Oscillators Data Handbook
Summary
This application note (AN-118) from Fairchild Semiconductor, published in October 1974, describes multiple square wave oscillator circuits built using CMOS logic elements. The circuits operate over a wide supply voltage range of 3 V to 15 V and a frequency range from less than 1 Hz to approximately 15 MHz with guaranteed startability and low power consumption. Both RC oscillators and two crystal-controlled oscillator designs are presented. The application note also covers oscillator stability co
Manual Details
| Brand | Fairchild |
|---|---|
| Pages | 4 |
| File Size | 77.59 KB |
| Published | July 07, 2026 |
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Frequently Asked Questions
What is the recommended supply voltage range for these oscillators?
The circuits can operate over a wide supply voltage range of 3V to 15V.
How does stability relate to application needs?
RC oscillators may be adequate for short time intervals or small errors, but high precision applications like timekeeping require crystal control.
What determines the natural frequency of an oscillator built with CMOS logic elements?
The frequency is determined by the total propagation delay through the ring and the number of gates used.
Is there a stable way to make these oscillators work in practice?
To build a usefully stable oscillator, it is necessary to add passive elements to supplement internal components like resistors or capacitors.