SN74HC4051MES

The 74HC4051 is an 8-channel analog multiplexer/demultiplexer with three address select inputs (A0~A2), an active-low enable input (E), eight independent I/O channels (Y0~Y7), and a common I/O terminal (Z). The device contains eight bidirectional analog switches, each with one end connected to an independent I/O channel (Y0~Y7) and the other end connected to the common I/O terminal (Z). When E is low, the switch on the channel selected by A0~A2 is in a low-resistance ON state. When E is high, the A0~A2 settings are ignored and all switches are in a high-resistance OFF state. The enable input (E) must be used whenever switch states need to be toggled. VDD and VSS are the supply voltages for the digital control inputs (A0~A2 and E). The (VDD − VSS) range is 3~9V. The analog I/O terminals (Y0~Y7 and Z) can swing between a maximum of VDD and a minimum of VEE. VDD − VEE must not exceed 9V. When used as a digital multiplexer, VEE and VSS are connected together (typically to ground).