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SN74LVC2244A: Different output when input float

Part Number: SN74LVC2244A

Tool/software:

Hi team,

customer use SN74LVC244 in their test system, and they found that when input is float by mistake, one device output high voltage and another device output low voltage on same board. I have explained that input pin can't be floated and noise may cause this different output. But customer still want to get more clear explanation of different output. Could you pls help to explain more clear? Thanks!

B&Rs,

Rayna