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.

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 components. 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 + trigger input or HIGH-to-LOW transition at - trigger input. The device can be retriggered by applying a simultaneous LOW-to-HIGH transition to both the + trigger and retrigger inputs.

A high level on Reset input resets the outputs Q to LOW, Q# to HIGH.

• Wide supply voltage range: 3.0V to 15V
• High noise immunity: 0.45 V_DD (typ.)
• Low power TTL compatibility: Fan out of 2 driving 74L or 1 driving 74LS

Special Features
• Low power consumption: special CMOS oscillator configuration
• Monostable (one-shot) or astable (free-running) operation
• True and complemented buffered outputs
• Only one external R and C required

Monostable Multivibrator Features
• Positive- or negative-edge trigger
• Output pulse width independent of trigger pulse duration
• Retriggerable option for pulse width expansion
• Long pulse widths possible using small RC components by means of external counter provision
• Fast recovery time essentially independent of pulse width
• Pulse-width accuracy maintained at duty cycles approaching 100%

Astable Multivibrator Features
• Free-running or gatable operating modes
• 50% duty cycle
• Oscillator output available
• Good astable frequency stability

  typical= ±2% + 0.03%/°C @ 100 kHz

  frequency= ±0.5% + 0.015%/°C @ 10 kHz

  deviation (circuits trimmed to frequency V_DD = 10V ±10%)