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CD4047 ic

CD4047 ic

We can use the IC in both Astable and Monostable mode, for making different circuit. The IC can be used for generating clock pulse, sine wave, square wave and many others. It can also be used in application of timing delay circuits, frequency multiplier and frequency divider. To generate an envelope signal from the original signal this IC is helpful.

It needs an external resistor to be connected between PIN 1 and 3 to determine the output pulse width in Monostable mode. For determining Output frequency in Astable mode it needs a capacitor to be connected between PIN 2 and 3.

Astable mode

If you want to use the IC in Astable mode you need to HIGH the PIN 5 and LOW the PIN 4. So that you will be able to get constantly fluctuating output between HIGH and LOW. 

The formula for finding the value of oscillated output frequency (from PIN 13) mathematically is:

OSC Out Frequency= 1 / 4.4RC

Formula for finding the pulse duration is:

t = 2.48RC


Monostable mode

If you want to use the IC in Monostable mode you have to use the +trigger and –trigger PIN. By giving Low to High transition at +trigger PIN and High to Low transition at –trigger PIN you wil be able to get a Monostable output. 

The formula for finding the value of frequency mathematically at PIN 11 and 10 is:

F = 1 / 8.8RC


  • Power Consumption is low
  • Provide Monostable (one-shot) and Astable (free running) operation
  • High noise immunity
  • Only one resistor and capacitor required externally
  • Standardized, symmetrical output characteristics

Monostable Features

  • Retriggerable option for pulse width expansion
  • Positive and negative edge trigger
  • Output pulse width independent of trigger pulse duration

Astable Features

  • Free running operating modes
  • 50% duty cycle
  • Oscillator output available
  • Astable frequency stability is good


Technical Specification

  • Wide range of supply input: 3v to 18v
  • Operating temperature range: −55°C to +125°C
  • Storage temperature range: −65°C to +150°C
  • DC input current: ±10mA
  • Soldering Lead temperature: 260°C ( for 10s max)


  • Frequency discriminators
  • Timing circuits
  • Time-delay applications
  • Envelope detection
  • Frequency multiplication
  • Frequency division

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