How to Use 4013: Examples, Pinouts, and Specs

The CD4013 is a CMOS Dual D-Type Flip-Flop integrated circuit. Each flip-flop has independent data, set, reset, and clock inputs and Q and Q\ outputs. This component is widely used in digital electronics for storing and transferring data based on clock signals. Common applications include:

• Signal buffering
• Data storage
• Frequency division
• Shift registers
• Counters

• Supply Voltage (Vdd): 3V to 15V
• Input Voltage (Vin): -0.5V to Vdd + 0.5V
• Operating Temperature: -55°C to +125°C
• Output Current: ±6.8 mA
• Propagation Delay Time: 50 ns (typical at Vdd = 10V)
• Power Dissipation: 500 mW

To use the CD4013 in a circuit:

1. Connect Vdd (pin 14) to your power supply (3V to 15V).
2. Connect GND (pin 7) to the ground of your power supply.
3. Apply the data signal to the D input (pin 5 for flip-flop 1 or pin 9 for flip-flop 2).
4. Apply the clock signal to the CLK input (pin 3 for flip-flop 1 or pin 11 for flip-flop 2).
5. The Q and Q\ outputs (pins 1 and 2 for flip-flop 1, pins 13 and 12 for flip-flop 2) will reflect the stored data based on the clock signal.

• Use a decoupling capacitor (0.1 µF) close to the Vdd pin to filter out noise.
• Avoid floating inputs by connecting unused set and reset pins to ground.
• Ensure that the clock signal has clean rising and falling edges to prevent glitches.

// Example code to control a CD4013 flip-flop with an Arduino UNO

const int clockPin = 2; // Connect to CLK1 (pin 3 of CD4013)
const int dataPin = 3;  // Connect to D1 (pin 5 of CD4013)
const int resetPin = 4; // Connect to RST1 (pin 4 of CD4013)

void setup() {
  pinMode(clockPin, OUTPUT);
  pinMode(dataPin, OUTPUT);
  pinMode(resetPin, OUTPUT);
  
  // Reset the flip-flop at the start
  digitalWrite(resetPin, HIGH);
  delay(10);
  digitalWrite(resetPin, LOW);
}

void loop() {
  // Set data to HIGH
  digitalWrite(dataPin, HIGH);
  // Toggle the clock to store the data
  digitalWrite(clockPin, HIGH);
  delay(10);
  digitalWrite(clockPin, LOW);
  
  // Set data to LOW
  digitalWrite(dataPin, LOW);
  // Toggle the clock to store the new data
  digitalWrite(clockPin, HIGH);
  delay(10);
  digitalWrite(clockPin, LOW);
  
  // Add a delay between cycles
  delay(1000);
}

• Unstable Outputs: Ensure that all unused inputs are tied to either Vdd or GND to prevent floating inputs.
• No Output Change on Clock Pulse: Check if the set or reset pins are inadvertently activated or if the data input is not changing.
• Glitches on Output: Verify that the clock signal is clean and without noise. Use a pull-up or pull-down resistor on the clock line if necessary.

Q: Can I use the CD4013 at 5V? A: Yes, the CD4013 can operate at 5V, which is within its supply voltage range.

Q: What is the maximum frequency the CD4013 can handle? A: The maximum frequency depends on the supply voltage. At 10V, the typical propagation delay is 50 ns, which corresponds to a maximum frequency of about 10 MHz.

Q: How do I reset the flip-flop? A: Apply a HIGH signal to the reset pin (RST1 or RST2). The output Q will go LOW, and Q\ will go HIGH.

Q: Can I chain multiple CD4013s together? A: Yes, you can connect the output of one flip-flop to the data input of another to create shift registers or counters.

This documentation provides a comprehensive guide to using the CD4013 Dual D-type Flip-Flop. For further information, consult the manufacturer's datasheet.