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TXB0108 question for the VCC slew rate

Other Parts Discussed in Thread: TXB0108

Hi Sir,

My customer are using the TXB0108 on their platfrom. it is a 1.8V(VCCA) to 3.3V(VCCB) appliation. Customer found that the slew rate of the 1.8V will change the initial direction.

If the 1.8V slew rate is slow, it will be A to B, if the 1.8V slew rate is fast, it will be B to A.

Below is the waveform, yellow is the VCCB(3.3V), blue is the VCCA (1.8V).

Thanks,

Patrick