CD4017 – A Decade Counter with Decoded Output
4017 Counter ic Working
CD4017 or HCF4017BE or 74HC4017 is a CMOS decade counter/ Divider. It has 16 pins and this counter has 10 decoded outputs. This is known also as 10 stages ‘Johnson decade counter. It has total 10 outputs. when a clock signal from the clock input given then output turns to Highl one by one in sequence. When the clock input is given to input, at each pulse of the clock input signal the output turns on in sequence.
CD4017 is the most popular ic which is widely used in various applications like Binary counter, Decoder, Decade counter, Frequency division, etc. This is more useful in different types of projects like Light Chaser, Remote controlled Switch, Alarm, Touch ON-OFF switch, Clap switch, Matrix Die etc.
This counter IC is also used in the electronic industries, medical electronic manufacturing devices, automotive industries, alarms and electronic instrumentation devices.
Pin diagram of 4017
Clock pin (pin14)- This is the input pin of this counter ic which gets the input clock signal from external circuit. Whenever pin 14 get clock pulse or it goes high to Low, it provides the output. At the first clock pulse pin 3 will turn high and give output; for next pulse pin 2 will high and provide output and after from pin 4 and so on. After 10 pulses it will repeat and again start to give output from Q0 .
Reset pin (pin 15) – This pin is known as reset pin and it used to reset the counter to zero. This pin is used to do reset the IC. The function of this pin is to start again the sequence from to the initial state. When a positive signal or supply voltage applied at this pin, the sequence comes back to pin 3 and the cycle starts from begins.
If the positive supply is connected to this pin15 continuously, output goes at the first output pin and get hold to the pin 3 (output First) and this pin is making high continuously.
Therefore to make this ic in Enable function, so pin 15 should be connected to the ground always.
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