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CD74HC4051: In floating, Getting voltage in the MUX I/O line.

Part Number: CD74HC4051
Other Parts Discussed in Thread: SN74LV4051A

Dear Team

We are using a MUX PN: CD74HC4051M96G3. In this, we are measuring analog voltages. 

When the I/O pins kept floating, we got 3.6V, 4.1V, and random voltages in the lines. 

Kindly suggest removing the floating voltages. 

If we need to add Pull down resistor kindly share the value of it.