The CD4051H is an 8-channel analog multiplexer/demultiplexer with three address inputs (S1 to S3), an active LOW enable input (E(—)), eight independent inputs/outputs (Y0 to Y7) and a common input/output (Z). The device contains eight bidirectional analog switches, each with one side connected to an independent input/output (Y0 to Y7) and the other side connected to a common input/output (Z). WithE(—) LOW, one of the eight switches is selected (low-impedance ON-state) by S1 to S3. WithE(—) HIGH, all switches are in the high-impedance OFF-state, independent of S1 to S3. If break before make is needed, then it is necessary to use the enable input.

V_DD and V_SS are the supply voltage connections for the digital control inputs (S1 to S3, andE(—)). The V_DD to V_SS range is 3V to 18V. The analog inputs/outputs (Y0 to Y7, and Z) can swing between V_DD as a positive limit and V_EE as a negative limit. V_DD-V_EE may not exceed 18V. Unused inputs must be connected to V_DD, V_SS, or another input. For operation as a digital multiplexer/demultiplexer, V_EE is connected to V_SS (typically ground). V_EE and V_SS are the supply voltage connections for the switches.