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Interfacing txb0108 causes signal distortion

Other Parts Discussed in Thread: TXB0108

Hi Experts,

While interfacing through the IC txb0108, I tried coupling it with the 100K pulled up resistor pins  between 3.3V and 1.8V.

The signal at 3.3V is driven Low at one end of level translator and it is expected that 1.8V also needs to be driven Low. But instead the signal goes High for every 300 ns.