Because the multiplexer can also process digital signals, you can use it to fer TTL-level serial data to multiple devices through pipe or fer from multiple devices. Drive it to a high level, and it will completely disconnect the common pins (all switches are disconnected). It is suitable for digital and analog signals (voltage cannot be higher than VCC) and can be connected in either direction. To control this, please connect the four digital outputs to the address selection pin of the chip (SO-S3) and send it the binary address of the desired channel. This is a very convenient 16 channel CD74HC4067 analog/digital multiplexer/demultiplexer. The internal switch is bidirectional, with a low on resistance and off leakage, and to prevent cross talk, please turn off the switch first and then on. Colour: blue Material: PCB Package Contents: 10 * CD74HC4067 Analog Multiplexer Only the above package content, other products are not included. Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm. Note: 1. Please allow 1-3 mm error due to manual measurement and 1-3g weight error make sure you don't mind before ordering. 2. Due to the lighting of the photos and the difference of monitors, the pictures may not reflect the actual color of the real item. Please make sure you don't mind before ordering, thank you! About Shipping: 1.please pay attention to your delivery address such as: name, street, house number, doorbell/email without name, etc. is correct, or the order will not be delivered correctly. 2.All items will be shipped within 3 business days after the payment is received. Most times you will receive them within 8-12 days then. The specific delivery time is depend on circumstances. 3.During the shopping process, if you have any questions, please feel free to consult us, we will reply you within 24 hours Hope you have a pleasant shopping experience!