74HC4067 CD74HC4067 Precise Module Digital Multiplexer MUX Breakout Board
1. This is a breakout board for the very handy 16-Channel Analogue/Digital Multiplexer/Demultiplexer CD74HC4067. This chip is like a rotary switch – it internally routes the common pin (COM in the schematic, SIG on the board) to one of 16 channel pins (CHANxx). It works with both digital and analogue signals (the voltage can’t be higher than VCC), and the connections function in either direction. To control it, connect 4 digital outputs to the chip’s address select pins (S0-S3) and send it the binary address of the channel you want (see the datasheet for details). This allows you to connect up to 16 sensors to your system using only 5 pins!
2. Since the mux/demux also works with digital signals, you can use it to pipe TTL-level serial data to or from multiple devices. For example, you could use it to connect the TX pins of 16 devices to one RX pin on your microcontroller. You can then select any one of those 16 devices to listen to. If you want two-way communications, you can add a second board to route your microcontroller’s TX line to 16 devices’ RX lines. By using multiple boards, you can create similar arrangements for I2C SPI etc.
3. The internal switches are bidirectional, supporting voltages between ground and VCC, have low on resistance and low off leakage and to prevent crosstalk, perform break-before-make switching. The board also breaks out the chip’s enable pin, which, when driven high, will completely disconnect the common pin (all switches off).
Specifications Summary
| Feature | Details |
|---|---|
| Supply Voltage (HC) | 2 V – 6 V |
| Supply Voltage (HCT) | 4.5 V – 5.5 V |
| ON-Resistance (RON) | ~70 Ω @ 4.5 V, ~60 Ω @ 6 V |
| Control Interface | S0–S3 selects channel (binary-decoded) |
| Enable Pin (E) | High → all channels off; Low → enabled |
| Leakage Current (Off) | ±0.8 µA typical |
| Quiescent Current (ICC) | ~8 µA |
| Switching Delay | ~6 ns (break-before-make) |
| Bandwidth (–3 dB) | ~89 MHz for HC/HCT @ 4.5 V |
| Signal Feedthrough | –75 dB |
| Operating Temperature | –55 °C to +125 °C |
| Package Options | SOIC, SSOP, TSSOP, narrow/wide body |
Package Includes:
- 1 x CD74HC406716-Channel Analog/Digital Multiplexer/Demultiplexer with 24 pins
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