General Description
The 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.
Features
â Wide supply voltage range: 3.0V to 15V
â High noise immunity: 0.45 VDD (typ.)
â Low power TTL compatibility: Fan out of 2 driving 74L or 1 driving 74LS
Special Features
â Low power consumption: special CMOS oscillator configuration
â Monostable (one-shot) or astable (free-running) operation
â True and complemented buffered outputs
â Only one external R and C required
Monostable Multivibrator Features
â Positive- or negative-edge trigger
â Output pulse width independent of trigger pulse duration
â Retriggerable option for pulse width expansion
â Long pulse widths possible using small RC components by means of external counter provision
â Fast recovery time essentially independent of pulse width
â Pulse-width accuracy maintained at duty cycles approaching 100%
Astable Multivibrator Features
â Free-running or gatable operating modes
â 50% duty cycle
â Oscillator output available
â Good astable frequency stability
typical= ±2% + 0.03%/°C @ 100 kHz
frequency= ±0.5% + 0.015%/°C @ 10 kHz
deviation (circuits trimmed to frequency VDD = 10V ±10%)
Applications
⢠Frequency discriminators
⢠Timing circuits
⢠Time-delay applications
⢠Envelope detection
⢠Frequency multiplication
⢠Frequency division
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