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74HC157n mux problems

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Jay23

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Hi All,
I am using quad 2:1 to control 3 relays. as the input signals to the mux are comming from 2 different uCs.
The mux has these config.
pin 15 is Enable
pin 1 Select

IN: 2,5,11 and 14
OUT: 4,7,9 and 12

The problem is when the circuit is turned on the relays are switching constantly On and Off.
The relays are SPST type. Enable and Select are grounded.

I am using the config as in the function table for this chip.
appreciate some help on this matter.
 

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Without a schematic there's no way to answer this. Your screenshot is useless. If you have Select grounded, then why even use the mux, why not just direct connect the signals?
 

He has already got an apropriate answer in another forum.
 

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