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.

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It can operate either in the monostable or astable mode. It has a voltage range of 3VV but works best at 5V. The pinout is the same for all packages. We can depict the working of each from the pinout diagram. For details and functions of each pin, check the next section. It is a low gate IC having three outputs. It requires very few external components for performing astable or monostable multivibrator operation. You can use this IC in designing low power square wave inverters.

It can operate in a monostable mode. Monostable can be used in signal conditioning or time delay circuits. This IC is an ideal choice for frequency Division and time Delay applications due to its complemented buffered outputs.

Multivibrators are devices that change the state of electrical signals on either a regular basis or according to the requirement. CD is also a multivibrator IC. It can operate in two modes. A capacitor is connected externally between pins 1 and 3 to determine the pulse width of the output signal in the monostable mode and the output frequency is determined in astable mode by connecting a resistor between pins 2 and 3.

A reset input is provided to reset the output of Q to 0 and the other output will become 1. The astable input connects with a high level. The output frequency can be calculated through timing components and is given by the following equation:.

In astable mode, we have an additional oscillator output. The timing diagram of the three outputs is shown below:. The Q output frequency is half to that of the basic frequency. Pin 11 output is the same as that of pin But the output signal is inverted to degrees. The time required to generate pulses is given by the formula:. In this section, we will see some practical example circuits using CD multivibrator circuit IC. We should use IC in astable mode to generate a square wave. A square wave is a PWM signal with equal width of logic high and low signal.

We only need a couple of resistors and capacitors with this multivibrator IC to generate a square signal. This is a circuit diagram for the square PWM generator.

We use RV1 as a variable resistor to get the variable frequency. This circuit shows a complete circuit diagram with an output signal. Some of its applications are:. CD datasheet. Notify me of follow-up comments by email. Notify me of new posts by email. Table of Contents. Monostable operation enables when the signal at this input is triggers by high to low transition. Monostable operation is enabled when the signal at this input is triggered by low to high transition.

When the reset input connects with the HIGH level, it resets the output Q to 0 and the non-inverting output to 1.


Datasheet Texas Instruments CD4047BE

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CMOS Low-Power Monostable/Astable Multivibrator



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CD4047BE Datasheet


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