HCT4051

The 74HC/HCT4051 are high-speed Si-gate CMOS devices and are pin compatible with the "4051" of the"4000B" series. They are specified in compliance with JEDEC standard no. 7A.

The 74HC/HCT4051 are 8-channel analog multiplexers/demultiplexers with three digital select inputs (S₀ to S₂), an active LOW enable input (E), eight independent inputs/outputs (Y₀ to Y₇) and a common input/output (Z).

With E LOW, one of the eight switches is selected (low impedance ON-state) by S₀ to S₂. With E HIGH, all switches are in the high impedance OFF-state, independent of S₀ to S₂.  V_CC and GND are the supply voltage pins for the digital control inputs (S₀ to S₂, and E). The VCC to GND ranges are 2.0 to 10.0 V for HC and 4.5 to 5.5 V for HCT. The analog inputs/outputs (Y₀ to Y₇, and Z) can swing between V_CC as a positive limit and V_EE as a negative limit. V_CC - V_EE may not exceed 10.0 V.  For operation of 74HC/HCT4051 as a digital multiplexer/demultiplexer, V_EE is connected to GND (typically ground).