This is a convenient 16 channel CD74HC4067 analog/digital multiplexer/demultiplexer. Drive it to a high level, and it completely disconnect the common pins (all switches are disconnected). It is suitable for digital and analog signals ( cannot be higher than VCC) and can be connected in either direction. To control this, connect the four digital outputs to the address pin of the chip (SO-) and send it the binary address of the channel. Because the multiplexer can also process digital signals, you can use it to TTL-level serial data to multiple devices through pipe or from multiple devices. The internal switch is bidirectional, with a low on resistance and off leakage, and to prevent talk, turn off the switch first and then on.
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