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.
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When it is high, the circuit will not receive clock signals and the counter will not count. On every positive edge of a clock, counter value gets increment by 1.
As this CD is a 5-stage decade counter. Therefore its most basic use is in counting applications. It can turn on its 10 outputs sequentially according to time and frequency at CLK input pin. In this project, the decade counter IC increments the counter value on every clock pulse and the output pins gets high one by one.
CD IC is best for projects that require a sequential counting pattern. How to use CD? Pin 13 which is clock enable pin is kept LOW otherwise it can halt the clock signal. This pin is responsible for resetting the counter to restart the counting from 0. Therefore, for normal operation of a circuit, these two pins are kept LOW.
Similarly, this range can be increased to 30, 40, …, 10N numbers. It will remain HIGH for 5 counts then will go down to 0 volts. When the count reaches 10, it will go HIGH again. The timing diagram indicating the behavior of all the outputs on different inputs is given below: Example Circuits In this section, we will see some example circuit using CD Counter. Therefore, we will display output of counter on LED bargraph.
As we mentioned earlier, output pins Q0-Q9 give logic high signal sequentially. Output transition occurs on every positive edge of clock cycle. The rate of output change depends on clock frequency. The maximum operating frequency which CD supports is 10MHz. Further, we can control output with the help of Enable pin.
For example, if input to enable pin is active high, output will halt. Therefore output will not change even on positive clock edge. Additionally, if you want to reset the output, MR pin can restart the counting.
We will provide clock signal through timer IC.
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