The CD4066 is a Quad Bilateral Switch IC, that is, it has four switches which can be controlled individual using a control pin. These switches can conduct in both the directions making it bilateral, it is commonly used for multiplexing analog or digital signals. The switches have very low internal resistance making it suitable for audio applications.
Pin Configuration
Pin Number
Pin Name
Description
1, 3, 8, 11
Switch Input A,B,C,D
Input pins for the four bilateral switches
2, 4, 9, 10
Switch Output A,B,C,D
Output pins for the four bilateral switches
5, 6, 12, 13
Control A,B,C,D
Control pins for the four bilateral switches
7
Ground
Ground pin of the IC
14
Vcc
Pin to power the IC
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