How to Use HCF4067B 16-channel analog multiplexer (DIP-24): Examples, Pinouts, and Specs

The HCF4067B, manufactured by STMicroelectronics, is a versatile 16-channel analog multiplexer/demultiplexer. It allows the selection of one of 16 input signals to be routed to a single output, or vice versa. This component supports both analog and digital signals, making it ideal for signal routing, data acquisition systems, and sensor multiplexing.

• Signal routing in data acquisition systems
• Sensor multiplexing in embedded systems
• Audio signal switching
• Expanding the number of analog inputs for microcontrollers
• Digital signal selection in logic circuits

The HCF4067B is designed for high-performance signal switching and routing. Below are its key technical details:

• Operating Voltage (VDD): 3V to 15V
• Input Signal Range: 0V to VDD
• On-Resistance (RON): 70Ω (typical at VDD = 10V)
• Maximum Input Current: ±10mA
• Propagation Delay: 50ns (typical at VDD = 10V)
• Power Dissipation: 700mW (maximum)
• Package Type: DIP-24
• Temperature Range: -55°C to +125°C

The HCF4067B is housed in a 24-pin DIP package. Below is the pinout and description:

The HCF4067B is straightforward to use in both analog and digital circuits. Below are the steps and considerations for integrating it into your design.

1. Power Supply:

   • Connect the VDD pin to the positive supply voltage (3V to 15V).
   • Connect the VSS pin to ground (0V).

2. Address Selection:

   • Use the S0-S3 pins to select one of the 16 channels. The binary value on these pins determines the active channel:
     • Example: S3 S2 S1 S0 = 0000 selects channel Y0, and 1111 selects channel Y15.

3. Signal Routing:

   • Connect the signal sources to the Y0-Y15 pins.
   • The selected channel will route its signal to the Z pin (or vice versa for demultiplexing).

4. Inhibit Control:

   • When the INH pin is HIGH, all channels are disabled, and no signal is routed to/from the Z pin.

5. Analog Signal Handling:

   • Ensure the input signal voltage stays within the range of 0V to VDD to avoid damage.

• Decoupling Capacitor: Place a 0.1µF ceramic capacitor close to the VDD pin to stabilize the power supply.
• Signal Integrity: For high-frequency signals, minimize trace lengths to reduce noise and signal degradation.
• Unused Inputs: Tie unused address pins (S0-S3) to ground or VDD to avoid floating inputs.
• Voltage Compatibility: Ensure the control signals (S0-S3, INH) are compatible with the VDD voltage level.

The HCF4067B can be easily interfaced with an Arduino UNO for channel selection. Below is an example code snippet:

// Define address pins connected to Arduino
const int S0 = 2;  // Connect S0 to Arduino pin 2
const int S1 = 3;  // Connect S1 to Arduino pin 3
const int S2 = 4;  // Connect S2 to Arduino pin 4
const int S3 = 5;  // Connect S3 to Arduino pin 5

// Define the common I/O pin
const int Z = A0;  // Connect Z to Arduino analog pin A0

void setup() {
  // Set address pins as outputs
  pinMode(S0, OUTPUT);
  pinMode(S1, OUTPUT);
  pinMode(S2, OUTPUT);
  pinMode(S3, OUTPUT);

  // Initialize serial communication for debugging
  Serial.begin(9600);
}

void loop() {
  for (int channel = 0; channel < 16; channel++) {
    // Set the address pins to select the channel
    digitalWrite(S0, channel & 0x01);  // LSB
    digitalWrite(S1, (channel >> 1) & 0x01);
    digitalWrite(S2, (channel >> 2) & 0x01);
    digitalWrite(S3, (channel >> 3) & 0x01);

    // Read the signal from the selected channel
    int signal = analogRead(Z);

    // Print the channel and signal value
    Serial.print("Channel ");
    Serial.print(channel);
    Serial.print(": ");
    Serial.println(signal);

    delay(500);  // Wait for 500ms before switching to the next channel
  }
}

1. No Signal on Output (Z):

   • Ensure the INH pin is LOW. If HIGH, all channels are disabled.
   • Verify the address pins (S0-S3) are set correctly for the desired channel.

2. Signal Distortion:

   • Check if the input signal voltage exceeds the range of 0V to VDD.
   • Minimize trace lengths and use proper shielding for high-frequency signals.

3. High On-Resistance:

   • The on-resistance increases at lower supply voltages. Use a higher VDD (within the specified range) for better performance.

4. Floating Inputs:

   • Tie unused address pins (S0-S3) to a defined logic level (HIGH or LOW) to avoid erratic behavior.

Q: Can the HCF4067B handle bi-directional signals?
A: Yes, the HCF4067B supports bi-directional signal routing, making it suitable for both multiplexing and demultiplexing.

Q: What is the maximum frequency the HCF4067B can handle?
A: The maximum frequency depends on the supply voltage and load conditions. For typical applications, it can handle signals up to a few MHz.

Q: Can I use the HCF4067B with 5V logic systems?
A: Yes, the HCF4067B is compatible with 5V logic systems when VDD is set to 5V.

Q: How do I disable all channels?
A: Set the INH pin HIGH to disable all channels and disconnect the Z pin from any input/output.