Multivibrator Circuit Composed of 74HC123

Published:2011/8/23 7:17:00 Author: | Keyword: Multivibrator | From:SeekIC

The picture shows the multivibrator circuit which is composed of 74HC123. In the figure 6-18, (a) shows the circuit of 74HC123's Q andits output pulse when the input signal's trailing edge is put on A terminal. (b) shows the circuit of 74HC123's Q andits output pulse when the input signal's rising edge is put on B terminal. The output pulse's width Tw is determined by R1,C1, which means Tw=R1C1. C1's accumulated electric charge is released through pin15 or pin7. When C1's capacitance is large, in order to reduce pin7's or pin 15's discharge current, R1 can be connected to the diode VD1 in parallel. C1's discharge current can get into +UCC directly through VD1 so that it can protect 74HC123.



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