CD4047_CMOS_OSCILLATOR

Published:2009/7/22 2:21:00 Author:Jessie | From:SeekIC

This CMOS square-wave oscillator is based on the 4047 multivibrator circuit, which can be used for either monostable ( one-shot ) or astable applications. In the configuration shown, the 4047 is an astable multivibrator. There are three outputs from the 4047. The first is the oscillator (OSC) output, which is connected directly to the internal oscillator circuit. The other two outputs, Q and Q, are complementary to each other and operate at one half the frequency of the internal oscillator. The output frequency is set by timing components R1 and C1: ƒo=1/(4.4R1C1) R1 should be between 10,000 Ω and 1 MΩ, while C1 should be 100 pF or more (the maximum capacitance is not limited theoretically, but a practical limit exists when the leakage resistance of C1 is of the same order of magnitude as R1).



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