CD74HC

16Ch Analog/Dig Multiplexer Breakout Module


  • The CD74HC4067 High-Speed CMOS 16-Channel Analog/Digital Multiplexer Breakout Module is a breakout board for the very handy 16-Channel Analog/Digital Multiplexer/Demultiplexer. 

  • 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 analog 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!

  • 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 device’s RX lines. By using multiple boards, you can create similar arrangements for I2C, SPI, etc.

  • The CD74HC4067  internal switches are bidirectional, support 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”).


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