Design with 74HC4051 CD4051 8-Channel Multiplexer in Cirkit DesignerThe 74HC4051 CD4051 is a high-speed CMOS 8-channel analog multiplexer/demultiplexer. It allows a single input/output line to be connected to one of eight independent channels, making it ideal for applications requiring signal routing, data acquisition, or analog signal selection. This component is manufactured by various generic manufacturers and is widely used due to its versatility and low cost.
This circuit uses a SparkFun 74HC4051 8-Channel Multiplexer to read the states of eight pushbuttons. Each pushbutton is connected to a corresponding input channel on the multiplexer through a 2k Ohm resistor, allowing the multiplexer to sequentially read the button states and output them to a single data line.
Open Project in Cirkit Designer
This circuit uses a 16-channel analog multiplexer to read the wiper positions of multiple rotary potentiometers, allowing for the selection and measurement of different analog signals. Additionally, an 8-channel multiplexer is used to read the states of multiple pushbuttons, enabling digital input selection.
Open Project in Cirkit Designer
This circuit features an Arduino Micro connected to three CD74HC4067 multiplexers, which are used to expand the number of analog inputs. Multiple potentiometers and toggle switches are connected to the multiplexers, allowing the Arduino to read various analog signals and switch states for further processing.
Open Project in Cirkit Designer
This circuit features a Teensy 4.1 microcontroller interfaced with a SparkFun 74HC4051 8-channel multiplexer to read multiple rotary potentiometers. The AMS1117 3.3V voltage regulator provides a stable 3.3V supply to the multiplexer and potentiometers, while electrolytic and ceramic capacitors are used for power supply filtering and stabilization.
Open Project in Cirkit Designer| Parameter | Value |
|---|---|
| Supply Voltage (Vcc) | 2V to 10V (CD4051), 2V to 6V (74HC4051) |
| Input Voltage Range | 0V to Vcc |
| Maximum Current per Pin | ±10mA |
| On-Resistance (Ron) | ~70Ω (at Vcc = 5V) |
| Propagation Delay | ~10ns (74HC4051) |
| Operating Temperature | -40°C to +125°C |
| Package Types | DIP, SOIC, TSSOP |
The 74HC4051 CD4051 has 16 pins, as described in the table below:
| Pin No. | Name | Description |
|---|---|---|
| 1 | X0 | Channel 0 input/output |
| 2 | X1 | Channel 1 input/output |
| 3 | X2 | Channel 2 input/output |
| 4 | X3 | Channel 3 input/output |
| 5 | X4 | Channel 4 input/output |
| 6 | X5 | Channel 5 input/output |
| 7 | X6 | Channel 6 input/output |
| 8 | X7 | Channel 7 input/output |
| 9 | VEE | Negative supply voltage (connect to GND for single-supply operation) |
| 10 | E (EN) | Enable pin (active LOW, enables the multiplexer when LOW) |
| 11 | S0 | Select line 0 (LSB) |
| 12 | S1 | Select line 1 |
| 13 | S2 | Select line 2 (MSB) |
| 14 | VCC | Positive supply voltage |
| 15 | Z | Common input/output (connected to one of X0-X7 based on select lines) |
| 16 | GND | Ground |
The following example demonstrates how to use the 74HC4051 CD4051 with an Arduino UNO to read analog signals from multiple sensors.
// Define select pins
const int S0 = 2; // Select line 0
const int S1 = 3; // Select line 1
const int S2 = 4; // Select line 2
// Define analog input pin
const int Z = A0; // Common input/output pin
void setup() {
// Set select pins as outputs
pinMode(S0, OUTPUT);
pinMode(S1, OUTPUT);
pinMode(S2, OUTPUT);
// Initialize serial communication
Serial.begin(9600);
}
void loop() {
for (int channel = 0; channel < 8; channel++) {
// Set select lines to choose the channel
digitalWrite(S0, channel & 0x01); // LSB
digitalWrite(S1, (channel >> 1) & 0x01);
digitalWrite(S2, (channel >> 2) & 0x01); // MSB
// Read the analog value from the selected channel
int sensorValue = analogRead(Z);
// Print the channel number and sensor value
Serial.print("Channel ");
Serial.print(channel);
Serial.print(": ");
Serial.println(sensorValue);
delay(500); // Wait for 500ms before reading the next channel
}
}
No Signal Output:
Incorrect Channel Selection:
Signal Distortion:
Q1: Can the 74HC4051 CD4051 handle digital signals?
Yes, it can route both analog and digital signals, provided the voltage levels are within the specified range.
Q2: What is the difference between 74HC4051 and CD4051?
The 74HC4051 operates at higher speeds and lower voltages (2V-6V), while the CD4051 supports a wider voltage range (2V-10V) but is slower.
Q3: Can I use this component for bidirectional signal routing?
Yes, the multiplexer supports bidirectional operation, allowing signals to flow in either direction between Z and the selected channel.
Q4: How do I use multiple 74HC4051 CD4051 chips in a single circuit?
You can cascade multiple chips by connecting their enable pins (E) to separate control signals and sharing the select lines (S0-S2).