CD4047BC Datasheet | National Semiconductor

Description CD4047B is capable of operating in either the monostable 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 width in the monostable mode and the output frequency in the astable mode Astable operation is enabled by a high level on the astable input or low level on the astable input The output frequency (at 50% duty cycle) at Q and Q outputs is determined by the timing ponents A frequency twice that of Q is available at the Oscillator Output a 50% duty cycle is not guaranteed Monostable operation is obtained when the device is triggered by low-to-high transition at a trigger input or high-tolow transition at b trigger input The device can be retriggered by applying a simultaneous low-to-high transition to both the a trigger and retrigger inputs A high level on Reset input resets the outputs Q to low Q to high MONOSTABLE MULTIVIBRATOR Features Positive- or negative-edge trigger Y Output pulse width independent of trigger pulse duration Y Retriggerable option for pulse width expansion Y Long pulse widths possible using small RC ponents by means of external counter provision Y Fast recovery time essentially independent of pulse width Y Pulse-width accuracy maintained at duty cycles approaching 100% Features ASTABLE MULTIVIBRATOR Features Y Free-running or gatable operating modes Y 50% duty cycle Y Oscillator output available Y Good astable frequency stability e g 2% a 0 03% C typical 100 k Hz frequency e g 0 5% a 0 015% C 10 k Hz deviation (circuits trimmed to frequency VDD e 10V g 10%) Wide supply voltage range High noise immunity Low power TTL patibility 3 0V to 15V 0 45 VDD (typ ) Fan out of 2 driving 74L or 1 driving 74LS Applications Y Y Y Y Y Y SPECIAL Features Y Low power consumption special CMOS oscillator configuration Y Monostable (one-shot) or astable (free-running) operation Y True and plemented buffered outputs Y Only one external R...