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SN74LVC1T45 issue

Other Parts Discussed in Thread: SN74LVC1T45

Hi, 

I have tried to simulate the SN74LVC1T45  and i have notice something strange. 

When VDDA and VDDB are equal, everything is fine as shown bellow.





However, when i change the VDDA to 3.3V then my output is 0V and does not vary with the input oscillation.

Do you know the reason why this happens?

Thank you!!