CD4017 - Decade Counter IC

Overview

Overview

The CD4017 is a decade counter integrated circuit (IC) designed to count from 0 to 9 and decode the output to drive 10 outputs. It is a popular CMOS (Complementary Metal-Oxide-Semiconductor) device commonly used in digital circuits for various applications, including clocks, timers, and sequencers.

Functionality

The CD4017 is a synchronous decade counter, meaning it counts the input clock pulses and decodes the output to drive one of the 10 outputs (Q0 to Q9) high, based on the count value. The counter can be reset to zero by applying a high pulse to the reset input (MR).

Here's a step-by-step explanation of the counter's operation:

The counter increments by one on the rising edge of the clock input (CLK).
The counter wraps around to zero when it reaches 10 (i.e., Q9 goes high).
The output of the counter is decoded to drive one of the 10 outputs (Q0 to Q9) high, based on the count value.
The counter can be reset to zero by applying a high pulse to the reset input (MR).

Key Features

Decade Counting: The CD4017 can count from 0 to 9, making it suitable for applications such as clocks, timers, and sequencers.
Synchronous Counting: The counter increments on the rising edge of the clock input, ensuring accurate counting.
Decode Output: The counter decodes the output to drive one of the 10 outputs (Q0 to Q9) high, based on the count value.
Reset Input: A high pulse on the reset input (MR) resets the counter to zero.
Low Power Consumption: The CD4017 has a low power consumption of 1 W (typical) at 5V, making it suitable for battery-powered applications.
Wide Operating Voltage: The IC operates from a wide voltage range of 3V to 18V, making it compatible with various power supply systems.
High Noise Immunity: The CD4017 has a high noise immunity due to its CMOS technology, ensuring reliable operation in noisy environments.

Pin Configuration

The CD4017 is available in a 16-pin dual in-line package (DIP) with the following pin configuration:

| Pin Number | Pin Name | Function |

| --- | --- | --- |

| 1 | Q0 | Output 0 |

| 2 | Q1 | Output 1 |

| 3 | Q2 | Output 2 |

| 4 | Q3 | Output 3 |

| 5 | Q4 | Output 4 |

| 6 | Q5 | Output 5 |

| 7 | Q6 | Output 6 |

| 8 | Q7 | Output 7 |

| 9 | Q8 | Output 8 |

| 10 | Q9 | Output 9 |

| 11 | CLK | Clock Input |

| 12 | MR | Master Reset Input |

| 13 | VCC | Positive Supply Voltage |

| 14 | GND | Ground |

| 15 | NC | No Connection |

| 16 | NC | No Connection |

Applications

The CD4017 is commonly used in various applications, including:

Digital clocks and timers

Sequencers and counters

Industrial control systems

Automotive systems

Medical devices

Consumer electronics

By providing a clear understanding of the CD4017's functionality and key features, this documentation aims to assist technical professionals and informed hobbyists in designing and developing innovative IoT projects that utilize this decade counter IC.

Pin Configuration

CD4017 - Decade Counter IC Pinout and Description
The CD4017 is a decade counter IC, a member of the 4000 series of CMOS (Complementary Metal-Oxide-Semiconductor) logic ICs. It is a 16-pin DIP (Dual In-Line Package) IC used for counting applications. Here's a detailed explanation of each pin:
Pin 1 - VDD (Positive Supply Voltage)
Function: Positive supply voltage pin
Description: Connect to a positive voltage source (+Vcc) in the range of 3V to 15V. Typically, 5V or 12V is used.
Pin 2 - Q1 (Output)
Function: Output pin of the first counter stage
Description: This pin goes high (logic 1) when the counter reaches 1.
Pin 3 - Q2 (Output)
Function: Output pin of the second counter stage
Description: This pin goes high (logic 1) when the counter reaches 2.
Pin 4 - Q4 (Output)
Function: Output pin of the fourth counter stage
Description: This pin goes high (logic 1) when the counter reaches 4.
Pin 5 - Q8 (Output)
Function: Output pin of the eighth counter stage
Description: This pin goes high (logic 1) when the counter reaches 8.
Pin 6 - CLK (Clock Input)
Function: Clock input pin
Description: This pin is used to feed the clock signal to the counter. A rising edge on this pin increments the counter.
Pin 7 - Enable (Enable Input)
Function: Enable input pin
Description: When this pin is high (logic 1), the counter is enabled, and when it's low (logic 0), the counter is disabled.
Pin 8 - Reset (Reset Input)
Function: Reset input pin
Description: When this pin is high (logic 1), the counter is reset to 0. The counter will start counting from 0 when the reset pin is brought low (logic 0) again.
Pin 9 - Q3 (Output)
Function: Output pin of the third counter stage
Description: This pin goes high (logic 1) when the counter reaches 3.
Pin 10 - Q5 (Output)
Function: Output pin of the fifth counter stage
Description: This pin goes high (logic 1) when the counter reaches 5.
Pin 11 - Q6 (Output)
Function: Output pin of the sixth counter stage
Description: This pin goes high (logic 1) when the counter reaches 6.
Pin 12 - Q7 (Output)
Function: Output pin of the seventh counter stage
Description: This pin goes high (logic 1) when the counter reaches 7.
Pin 13 - Q9 (Output)
Function: Output pin of the ninth counter stage
Description: This pin goes high (logic 1) when the counter reaches 9.
Pin 14 - Q10 (Output)
Function: Output pin of the tenth counter stage
Description: This pin goes high (logic 1) when the counter reaches 10.
Pin 15 - VSS (Negative Supply Voltage)
Function: Negative supply voltage pin
Description: Connect to a negative voltage source (GND) or 0V.
Pin 16 - Carry Out (Carry Output)
Function: Carry output pin
Description: This pin goes high (logic 1) when the counter reaches 10, indicating that the counter has overflowed.
Connecting the Pins:
1. Connect VDD (Pin 1) to a positive voltage source (+Vcc) in the range of 3V to 15V.
2. Connect VSS (Pin 15) to a negative voltage source (GND) or 0V.
3. Connect the CLK (Pin 6) to a clock signal source.
4. Connect the Enable (Pin 7) to a logic-high signal to enable the counter.
5. Connect the Reset (Pin 8) to a logic-high signal to reset the counter.
6. Connect the output pins (Q1 to Q10) to the desired load, such as LEDs, transistors, or other logic ICs.
7. Connect the Carry Out (Pin 16) to a logic circuit or another counter IC to cascade the counters.
Note: Ensure that the voltage and current ratings of the CD4017 IC are not exceeded during operation. Additionally, use proper decoupling capacitors and voltage regulators to ensure stable power supply to the IC.

Code Examples

CD4017 Decade Counter IC Documentation

Overview

The CD4017 is a 5-stage Johnson decade counter integrated circuit (IC) used for counting and decoding applications. It is a popular IC used in digital circuits, microcontrollers, and other electronic devices. The CD4017 can be used to generate a binary count from 0 to 9, making it suitable for various applications such as clocks, timers, and sequencers.

Pinout

The CD4017 IC has 16 pins, with the following pinout:

| Pin Number | Pin Name | Function |
| --- | --- | --- |
| 1 | VCC | Positive Supply Voltage |
| 2 | Q0 | Output (Binary 0) |
| 3 | Q1 | Output (Binary 1) |
| 4 | Q2 | Output (Binary 2) |
| 5 | Q3 | Output (Binary 3) |
| 6 | Q4 | Output (Binary 4) |
| 7 | Q5 | Output (Binary 5) |
| 8 | Q6 | Output (Binary 6) |
| 9 | Q7 | Output (Binary 7) |
| 10 | Q8 | Output (Binary 8) |
| 11 | Q9 | Output (Binary 9) |
| 12 | CLK | Clock Input |
| 13 | CLR | Clear Input (Active Low) |
| 14 | ENABLE | Enable Input (Active High) |
| 15 | GND | Ground |
| 16 | VCC | Positive Supply Voltage |

Code Examples

### Example 1: Basic Decade Counter using CD4017

In this example, we will use the CD4017 to generate a decimal count from 0 to 9. We will connect the clock input (CLK) to a push-button, and the outputs (Q0-Q9) to LEDs to display the count.

Circuit Diagram

Connect the push-button to pin 12 (CLK) and the LEDs to pins 2-11 (Q0-Q9). Connect VCC to +5V and GND to GND.

Arduino Code

```c
const int clockPin = 2;  // Clock input
const int resetPin = 3;  // Clear input
const int enablePin = 4;  // Enable input

int count = 0;

void setup() {
  pinMode(clockPin, INPUT);
  pinMode(resetPin, OUTPUT);
  pinMode(enablePin, OUTPUT);
  
  digitalWrite(resetPin, HIGH);  // Initialize clear input to high
  digitalWrite(enablePin, HIGH);  // Initialize enable input to high
}

void loop() {
  if (digitalRead(clockPin) == LOW) {
    count++;
    if (count > 9) {
      count = 0;
    }
    delay(50);  // Debounce time
  }
  
  // Display count on LEDs
  if (count == 0) {
    digitalWrite(2, HIGH);
    digitalWrite(3, LOW);
    digitalWrite(4, LOW);
    ...
  } else if (count == 1) {
    digitalWrite(2, LOW);
    digitalWrite(3, HIGH);
    digitalWrite(4, LOW);
    ...
  }
  ...
}
```

### Example 2: CD4017 as a Sequencer

In this example, we will use the CD4017 to sequence a series of events. We will connect the clock input (CLK) to a timer circuit, and the outputs (Q0-Q9) to relays that control different loads.

Circuit Diagram

Connect the timer circuit to pin 12 (CLK) and the relays to pins 2-11 (Q0-Q9). Connect VCC to +5V and GND to GND.

Arduino Code

```c
const int clockPin = 2;  // Clock input
const int relayPins[] = {3, 4, 5, 6, 7, 8, 9, 10, 11};  // Relay pins

void setup() {
  pinMode(clockPin, INPUT);
  
  for (int i = 0; i < 9; i++) {
    pinMode(relayPins[i], OUTPUT);
  }
}

void loop() {
  static int sequence = 0;
  
  if (digitalRead(clockPin) == LOW) {
    sequence++;
    if (sequence > 9) {
      sequence = 0;
    }
    
    // Sequence the relays
    for (int i = 0; i < 9; i++) {
      if (i == sequence) {
        digitalWrite(relayPins[i], HIGH);
      } else {
        digitalWrite(relayPins[i], LOW);
      }
    }
    delay(1000);  // Time between sequence steps
  }
}
```

Note: These examples are for illustration purposes only and may require additional components and modifications to work in a real-world application.