Ic CD4017 pinout Datasheet and applications
The CD4017 is one of the most popular decade counter/divider ICs used in various electronics projects, especially for LED chasers, sequence counters, and digital clocks. It's part of the 4000-series CMOS integrated circuits and offers a simple yet powerful way to count from 0 to 9 using a clock signal. In this post, we will delve into the pinout, datasheet details, and applications of the CD4017 IC, giving you a comprehensive understanding of its usage in practical projects.
Pinout of IC CD4017
The CD4017 IC comes in a 16-pin dual in-line package (DIP) and operates on a wide voltage range from 3V to 15V, making it suitable for both low and high-power applications. Here's a breakdown of each pin:
Pin Configuration:
| Pin No | Pin Name | Description |
|---|---|---|
| 1 | Q5 | Output for counter position 5 |
| 2 | Q1 | Output for counter position 1 |
| 3 | Q0 | Output for counter position 0 |
| 4 | Q2 | Output for counter position 2 |
| 5 | Q6 | Output for counter position 6 |
| 6 | Q7 | Output for counter position 7 |
| 7 | Q3 | Output for counter position 3 |
| 8 | GND | Ground |
| 9 | Q8 | Output for counter position 8 |
| 10 | Q4 | Output for counter position 4 |
| 11 | Q9 | Output for counter position 9 |
| 12 | CO (Carry Out) | Carry output (used for cascading ICs) |
| 13 | EN (Enable) | Enable pin (active-low to count) |
| 14 | CLOCK | Clock input (triggers the counter) |
| 15 | RESET | Resets the counter to zero (active-high) |
| 16 | VDD (VCC) | Positive supply voltage (3V-15V) |
Key Pin Functions:
- CLOCK (Pin 14): The clock pin drives the counter. Each rising edge of the clock signal advances the counter by one.
- RESET (Pin 15): This pin resets the counter back to zero when pulled high. Useful for resetting or initializing a sequence.
- ENABLE (Pin 13): This active-low pin enables or disables the counter. When held HIGH, the counting stops, and the IC halts at its current state.
- OUTPUT Pins (Q0-Q9): These are the 10 outputs of the CD4017, each representing one of the 10 counting stages (0-9).
- CARRY OUT (Pin 12): Useful for cascading multiple CD4017 ICs to extend the counting beyond 10.
CD4017 Datasheet Highlights
The datasheet provides valuable technical insights into the CD4017, ensuring you understand its electrical characteristics and limitations. Here are some key details:
Electrical Specifications:
- Supply Voltage: 3V to 15V (typical operation at 5V or 9V)
- Maximum Clock Frequency: 5 MHz (at 5V)
- Output Current:
- Sink: 10mA at 5V
- Source: 0.88mA at 5V
- Power Dissipation: 500 mW (maximum)
- Input Threshold Voltage: Approximately 1.5V at 5V VDD
- Operating Temperature Range: -40°C to +85°C
The IC is highly efficient, with low power consumption, making it ideal for battery-operated devices. The noise immunity and static protection in the 4000-series CMOS chips further enhance its reliability in harsh conditions.
Applications of CD4017
The CD4017’s ability to count and sequentially output signals makes it a versatile IC used in a variety of applications. Let’s look at some of the most common uses.
1. LED Chasers and Sequence Lighting
One of the most popular uses of the CD4017 is in LED chasers. When combined with an oscillator or clock signal (usually generated using a 555 timer), the IC can turn on and off LEDs in a sequence, creating a "chasing" effect. This makes it useful in decorative lighting and visual displays.
2. Digital Counters
In digital electronics projects, CD4017 can be used to count events or time periods. For example, it can count clock pulses and display the result using 7-segment displays when combined with a decoder IC like the 4511.
3. Frequency Dividers
The CD4017 can act as a frequency divider. For instance, if you provide a clock signal of 10Hz, the IC will output a signal of 1Hz on its carry-out pin (Pin 12). This is useful in frequency-related applications like pulse-width modulation or in time-delay circuits.
4. Traffic Light Controller
A simple traffic light control system can be built using the CD4017 by sequentially turning on and off different traffic signals (red, yellow, green). It can be combined with a timer circuit for timing the intervals between signal changes.
5. Sequential Timing Circuits
You can use the CD4017 for creating sequential timing circuits for different tasks. For instance, you might use it to control different appliances in a timed manner (e.g., turning devices on and off in a specific sequence).
6. Cascaded Counters for Higher Counts
By using the carry-out (Pin 12), multiple CD4017 ICs can be connected to extend counting beyond 10. This allows designers to create counters for applications requiring higher counts, such as event counters or extended sequence controllers.
How to Use the CD4017 in Your Projects
The CD4017 is quite straightforward to use. Here's an example of how you can connect it to create an LED chaser:
Components Needed:
- CD4017 IC
- 555 Timer IC (as clock pulse generator)
- Resistors (various values)
- Capacitors
- 9V battery
- LEDs (10 pieces)
Basic Steps:
- 555 Timer Setup: Configure the 555 timer in astable mode to produce clock pulses at a desired frequency.
- Connect the Clock Input (Pin 14) to the 555 Timer’s Output: The clock pulses will drive the CD4017 counter.
- Reset and Enable Pins: Tie the RESET (Pin 15) to ground and the ENABLE (Pin 13) to ground for normal operation.
- LEDs: Connect the LEDs to the output pins Q0 to Q9 via current-limiting resistors.
- Power Supply: Connect Pin 16 to VCC (e.g., 9V) and Pin 8 to GND.
As the clock pulses are received, the CD4017 will turn on each LED in sequence, creating a chasing effect. This simple circuit is a great beginner project and demonstrates the core function of the IC.
Conclusion
The CD4017 decade counter is a versatile and easy-to-use IC that finds its place in numerous electronics projects, from simple LED chasers to complex event counters. Its low power consumption, wide voltage range, and high noise immunity make it ideal for both hobbyist and professional designs. By understanding its pinout, datasheet specifications, and applications, you can take full advantage of its capabilities in your next electronics project.
With a little experimentation, the CD4017 opens up a world of possibilities in sequential control circuits and digital counting systems!
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