1.74HC4051: The 74HC4051 is a highspeed CMOS building block with a low power Schottky TTL (LSTTL) 74HC4051 family that is compatible with 74HC4051 pins that comply with JEDEC standard No. 7A. The 74HC4051 is an 8channel analog multiplexer/demultiplexer with 3 digital selections (S0 to S2), 1 active lowenable (E) and 8 independent I/O (Y0 to Y7) and 1 common I/O (Z). 2.Compact design: when E is low, one of 8 switches from S0 to S2 (low resistance state) is selected. When E is high, all switches go to the high impedance state and ignore S0 to S2 directly. VCC and GND are the power pins for the digital control ports (S0 to S2, E). The VCC to GND range of the 74HC4051 is 2.0V to 10.0V. 3.High performance: 74HC4051 analogue input/output (Y0 to Y7, Z varies from the VCC upper limit to VEE lower limit, VCC VEE should not exceed 10.0 V. As a digital multiplexer/demultiplexer, VEE is connected to On GND (usually grounded). 4.FeaturesAnalog input and output voltage: 5V5V Interface communication type: digital simulation Module size: 29mm x 18mm with two M3 mounting holes