CD4518 PDF

And also use to build all kinds of the timer, LED sequencers and controllers circuits. This counts with 5 D-type flip-flops. Decoding and control are by 16 inverters and 15 gates. Pin 16 is a positive power supply and pin 8 is a ground. The power supply range of 3 volts to 16 volts. And Maximum power supply voltage does not more than 18 volts.

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Where to use CD IC The IC CD is used for counting applications, it has the capability to turn on 10 outputs sequentially in a pre-defined time and reset the count or hold it when required. It also has the capability to indicate the status of counting using Carry pin.

We have 10 output pins ranging from Q0 to Q9, these pins can be connected to any load but we are using LEDs here as shown in the circuit below. This IC will increment the count from 0 to 9 Q0 to Q9 each time it senses a high pulse from the clock pin pin The output changes sequentially from Q0 to Q9 for every high pulse from the Clock pin, but this sequence can be interrupted by two pins.

They are the Clock Enable pin 13 and Reset pin 15 pins. Similarly, if the reset pin is made high. The count will reset itself back to Q0 and will stay there until Q0 is made low again. We have another pin called the carry out pin 12th pin , this pin will stay low 0V by default. But when the IC completes counting up to 10, the pin will go high and will remain high till it counts till 5, when its 5 it will go down 0V and turn on again when it reaches The timing diagram of the IC indicating the state of Output pins and Carry pin for every high pulse signal is shown below.

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