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CD 4017 IC-Decade Counter

13

When we build the 10 LEDs running light for hobby. Often use IC-4017 CMOS-IC. This really neat chip contains a counter and a decoder circuit, that can show a single output pin for each count from 0 to 9. And also use to build all kinds of timer, LED sequencers and controllers circuits.

  • The supply voltage of this IC is 3V to 15V.
  • It is compatible with TTL (Transistor -Transistor Logic).
  • The clock speed or operational speed of CD4017 IC is 5 MHz.

The CD4017 is  a CMOS Decade counter IC. CD4017 is used for low range counting applications. It can count from 0 to 10 (the decade count). The circuit designed by using  this ic  will save board space and also time required to design the circuit. CD4017 is  as ‘Johnson 10 stage decade counter’.

This IC is also used in electronic industries, automotive industries, manufacturing medical electronic devices, alarms and in electronic instrumentation devices.

CD4017 Pin description

It has 16 I/O pins.CD4017

Output pins of CD4017(Pin 1 to 7 & 9 to 11)

  • Pins 1 to 7 and 9 to 11 are outputs pins.
  • These  pins changes to ‘high’ level one by one (one after another) in a sequence. For each clock signal each pin goes high in a sequence.

Enable pin/Clock Inhibit(Pin 13)

  • Enable pin enables the CD4017 IC.IC is enabled when the pin is active low.
  • In order to disable or switch off the IC,this pin should be connected to active high input.When this pin is active high ,it ignores the clock signals.

Clock pin(pin 14)

  • Clock signal provided to 14 th is responsible for sequential output.
  • When the first clock pulse is detected pin 3 goes ,for next clock pulse pin2 goes high,like this sequence is formed.
  • The important thing to remember is, if we don’t connect any clock signal to this input pin, it must be connected to either positive or negative voltage supply.
  • It is not left unconnected as per the CMOS input standard rules.
  • The clock input pin (pin number 14) responds only to the positive voltage signal or positive clock

Reset pin(Pin 15)

  • Reset pin resets the output of the sequence.That is the current state of the output sequence is set to initial state.
  • Reset pin should be connected to ground in order to reset the circuit.

Ground pin & supply pin(Pin 8 & Pin 16)

Pin number 8 acts as ground and it must be connected to negative supply voltage & pin number 16 is the supply pin for CD4017 and it is connected to positive voltage supply.

Carry out pin(pin12)

The pin 12 is supplied with the CARRY OUT signal. It completes one full cycle for every 10 clock cycles. This is used to ‘ripple’ the IC, which means to delay in counting operations.

When we build the 10 LEDs running light for hobby. Often use IC-4017 CMOS-IC. This really neat chip contains a counter and a decoder circuit, that can show a single output pin for each count from 0 to 9. And also use to build all kinds of timer, LED sequencers and controllers circuits.

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