The CD4047B is capable of operating in either themonostable or astable mode. It requires an external capacitor(between pins 1 and 3) and an external resistor(between pins 2 and 3) to determine the output pulse widthin the monostable mode, and the output frequency in theastable mode.Astable operation is enabled by a high level on the astableinput or low level on the astable input. The output frequency(at 50% duty cycle) at Q and Q outputs is determinedby the timing components. A frequency twice that ofQ is available at the Oscillator Output; a 50% duty cycle isnot guaranteed.Monostable operation is obtained when the device is triggeredby LOW-to-HIGH transition at + trigger input orHIGH-to-LOW transition at - trigger input. The device canbe retriggered by applying a simultaneous LOW-to-HIGHtransition to both the + trigger and retrigger inputs.A high level on Reset input resets the outputs Q to LOW, Qto HIGH.
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