The CD4017 is a 16 pin CMOS counter/divider which consists of 10 Johnson counters with 10 decoded outputs and a carry-out bit. The configuration of the CD4017 is used for a counting sequence. The 10/8 decoded outputs are turned on in sequence when the clock signal is applied at the input means that the outputs are in the low state “0” when we apply clock it goes in high state “1” on every positive edge of a clock each output turn on one by one. The carry-out signal will be high when for every 10 clock input cycles. The enable and reset pins are used to control counting and reset. The configuration permits medium speed operation and assures a hazard-free counting sequence. This IC count from 0 to 9 or 1 to 10.
Features:
Cd4017 is 16 pin CMOS decade counter high operating frequency IC
The voltage supply range is from 3V to 15V but in normal operation, +5V is used.
Decoded outputs pins = 10
Wide supply voltage range: 3.0V to 15V
Clock input is Schmitt triggered which provides pulse shaping and therefore it has no rise and fall times limitation.
Storage Temperature (TS) −65°C to +150°C
High noise immunity: 0.45 VDD (typ.)
Medium speed operation: 5.0 MHz (typ.) with 10V VDD
Low power: 10 µW (typ.)
Fully static operation
CD4017 is TTL compatible
It has a medium operational speed which is typically 5MHz and the maximum clock frequency is 5.5Mhz
Multiple 16-pin packages PDIP, GDIP, PDSO packages
CD4017 IC Pin Configuration Description
The pin configuration of this IC can be explained below:
Q0 – Q9
CD4017 consists of 10 decoded outputs. One of the 10 decoded outputs may be high at a time. It is used to receive the output in a sequential manner. When the first pulse came from the clock pin 3 which output 0 will provide you the output and so on.
Pin-1: When the counter reads 5 counts then this pin 1 will become high which is output number 5.
Pin-2: When the counter reads 1 count then this pin 2 will become high which is output number 1.
Pin-3: When the counter reads 0 counts then this pin 3 will become high which is the output number 0.
Pin-4: When the counter reads 2 counts then this pin 4 will become high which is output number 2.
Pin-5: When the counter reads 6 counts then this pin 5 will become high which is output number 6.
Pin-6: When the counter reads 7 counts then this pin 6 will become high which is the output number 7.
Pin-7: When the counter reads 3 counts then this pin 7 will become high which is the output number 3.
Pin-9: When the counter reads 8 counts then this pin 9 will become high which is output number 8.
Pin-10: When the counter reads 4 counts then this pin 10 will become high which is output number 4.
Pin-11: When the counter reads 9 counts then this pin 11 will become high which is the output number 9.
Ground pin 8:
The ground is supply to this IC at Pin number 8.
Carry out pin 12:
This pin number is used to delay the counting operation. When the 10 clock cycles complete one full cycle complete and the carry bit will be used as a delay
Enable pin/Clock Pin 13:
When the enable is low then the IC CD 4017 will perform its operation. So to make the IC on we will ground the enable pin and if we want to off the IC we will make it high when this pin is in the high state it will ignore the clock signal. It will work only when we make this pin to operate in a low state.
Clock pin 14:
This pin will operate on the positive edge of the clock. When the first clock pulse is detected pin 3 goes, for the next clock pulse pin 2 goes high like this sequence is formed. A sequence output will be formed Q0 to Q9.
The clock signal important part of this IC because the whole working of this IC is based on this PIN, it should be connected with the voltage source if there is no clock signal because it should be not left unconnected.
Reset pin (Pin 15)
This pin will reset the counter from the beginning. The IC will operate when the Reset pin is in the low state and if we want to reset the counter we will provide high voltage.
Supply Pin 16
The voltage is supplied to this IC CD4017 through Pin number 16. The voltage range for this IC 3V to 15V for the IC to function.
CD4017 IC Uses:
As this CD4017 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 the CLK input pin. Its counting speed can be increase or decrease by increasing its frequency. This is commonly used in projects used for LED chasers for example LED sequencer. In this project, the decade counter IC increments the counter value on every clock pulse and the output pins get high one by one. LEDs are connected to these outputs which glow in a sequential pattern. CD4017 IC is best for projects that require a sequential counting pattern.
CD4017 IC working:
CD4017 has 10 output pins (Q0 to Q9) that get HIGH in a sequential pattern when the clock signal is ied. The first output we will get at pin number 3. The clock signal will be applied at Pin 14. This clock signal can be generated through 555 timer IC or any other digital IC’s. Pin 13 which is clock enable pin is kept LOW otherwise it can halt the clock signal and the IC will not perform counting. The Reset Pin is also kept LOW. 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 which are Pin 13 and Pin 15.
CD4017 IC Timing Diagram
We can increase the counting to 20 by cascading two IC’s. Similarly, this range can be increased to 30, 40, …, 10N numbers. The cascading is done by carrying Out pin which is LOW by default but when the counts reach 10, this pin gets HIGH. It will remain HIGH for 5 counts then will go down to 0 volts. When the count reaches 10, it will go HIGH again.
Frequency Divider Circuit using 555 Timer and CD4017:
In this project, the input frequency will be dividing by 2 and 4. This project works as Frequency Divider. When the input signal will be applied its frequency will be divided. Analog and digital signals both require Frequency dividers. In this circuit the input signal will be generated with the help of 555 timer IC the input frequency of the signal can be adjusted with the help of a potentiometer and resistor 555 timer will work as an astable multivibrator. The input signal will be divided by the help of CD4017. SPDT relay will uses for switching the frequency.
The CD4017 is a 16 pin CMOS counter/divider which consists of 10 Johnson counters with 10 decoded outputs and a carry-out bit. The configuration of the CD4017 is used for a counting sequence. The 10/8 decoded outputs are turned on in sequence when the clock signal is applied at the input means that the outputs are in the low state “0” when we apply clock it goes in high state “1” on every positive edge of a clock each output turn on one by one. The carry-out signal will be high when for every 10 clock input cycles. The enable and reset pins are used to control counting and reset. The configuration permits medium speed operation and assures a hazard-free counting sequence. This IC count from 0 to 9 or 1 to 10.
Features:
Cd4017 is 16 pin CMOS decade counter high operating frequency IC
The voltage supply range is from 3V to 15V but in normal operation, +5V is used.
Decoded outputs pins = 10
Wide supply voltage range: 3.0V to 15V
Clock input is Schmitt triggered which provides pulse shaping and therefore it has no rise and fall times limitation.
Storage Temperature (TS) −65°C to +150°C
High noise immunity: 0.45 VDD (typ.)
Medium speed operation: 5.0 MHz (typ.) with 10V VDD
Low power: 10 µW (typ.)
Fully static operation
CD4017 is TTL compatible
It has a medium operational speed which is typically 5MHz and the maximum clock frequency is 5.5Mhz
Multiple 16-pin packages PDIP, GDIP, PDSO packages
CD4017 IC Pin Configuration Description
The pin configuration of this IC can be explained below:
Q0 – Q9
CD4017 consists of 10 decoded outputs. One of the 10 decoded outputs may be high at a time. It is used to receive the output in a sequential manner. When the first pulse came from the clock pin 3 which output 0 will provide you the output and so on.
Pin-1: When the counter reads 5 counts then this pin 1 will become high which is output number 5.
Pin-2: When the counter reads 1 count then this pin 2 will become high which is output number 1.
Pin-3: When the counter reads 0 counts then this pin 3 will become high which is the output number 0.
Pin-4: When the counter reads 2 counts then this pin 4 will become high which is output number 2.
Pin-5: When the counter reads 6 counts then this pin 5 will become high which is output number 6.
Pin-6: When the counter reads 7 counts then this pin 6 will become high which is the output number 7.
Pin-7: When the counter reads 3 counts then this pin 7 will become high which is the output number 3.
Pin-9: When the counter reads 8 counts then this pin 9 will become high which is output number 8.
Pin-10: When the counter reads 4 counts then this pin 10 will become high which is output number 4.
Pin-11: When the counter reads 9 counts then this pin 11 will become high which is the output number 9.
Ground pin 8:
The ground is supply to this IC at Pin number 8.
Carry out pin 12:
This pin number is used to delay the counting operation. When the 10 clock cycles complete one full cycle complete and the carry bit will be used as a delay
Enable pin/Clock Pin 13:
When the enable is low then the IC CD 4017 will perform its operation. So to make the IC on we will ground the enable pin and if we want to off the IC we will make it high when this pin is in the high state it will ignore the clock signal. It will work only when we make this pin to operate in a low state.
Clock pin 14:
This pin will operate on the positive edge of the clock. When the first clock pulse is detected pin 3 goes, for the next clock pulse pin 2 goes high like this sequence is formed. A sequence output will be formed Q0 to Q9.
The clock signal important part of this IC because the whole working of this IC is based on this PIN, it should be connected with the voltage source if there is no clock signal because it should be not left unconnected.
Reset pin (Pin 15)
This pin will reset the counter from the beginning. The IC will operate when the Reset pin is in the low state and if we want to reset the counter we will provide high voltage.
Supply Pin 16
The voltage is supplied to this IC CD4017 through Pin number 16. The voltage range for this IC 3V to 15V for the IC to function.
CD4017 IC Uses:
As this CD4017 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 the CLK input pin. Its counting speed can be increase or decrease by increasing its frequency. This is commonly used in projects used for LED chasers for example LED sequencer. In this project, the decade counter IC increments the counter value on every clock pulse and the output pins get high one by one. LEDs are connected to these outputs which glow in a sequential pattern. CD4017 IC is best for projects that require a sequential counting pattern.
CD4017 IC working:
CD4017 has 10 output pins (Q0 to Q9) that get HIGH in a sequential pattern when the clock signal is ied. The first output we will get at pin number 3. The clock signal will be applied at Pin 14. This clock signal can be generated through 555 timer IC or any other digital IC’s. Pin 13 which is clock enable pin is kept LOW otherwise it can halt the clock signal and the IC will not perform counting. The Reset Pin is also kept LOW. 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 which are Pin 13 and Pin 15.
CD4017 IC Timing Diagram
We can increase the counting to 20 by cascading two IC’s. Similarly, this range can be increased to 30, 40, …, 10N numbers. The cascading is done by carrying Out pin which is LOW by default but when the counts reach 10, this pin gets HIGH. It will remain HIGH for 5 counts then will go down to 0 volts. When the count reaches 10, it will go HIGH again.
Frequency Divider Circuit using 555 Timer and CD4017:
In this project, the input frequency will be dividing by 2 and 4. This project works as Frequency Divider. When the input signal will be applied its frequency will be divided. Analog and digital signals both require Frequency dividers. In this circuit the input signal will be generated with the help of 555 timer IC the input frequency of the signal can be adjusted with the help of a potentiometer and resistor 555 timer will work as an astable multivibrator. The input signal will be divided by the help of CD4017. SPDT relay will uses for switching the frequency.
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