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hi,
When simulate TXB0304 i see unreasonable behavior with 40MHz signal with 10cm transmition line load in series and 1pF capacitance to ground (even with series termination).
Can i please get assistance in understanding the issue?
thanks
Lidar
Hi Lidar,
It may be something to do with the software you are using.
I used the Hyperlynx s/w and captured this waveform under similar conditions. The signal integrity is much better compared to your simulations.
I found that the model of the TXB0304 had 2 parts. one with the one-shot and another without it.
we need to include both the models together to make it work as shown below.
The loading is 50k, and 1pF, with the trans line with 75Zo and 0.5ohm resistance. The signal goes to 1.8V at 40Mhz.
I have a scope shot with me for testing a 1.8 to 3.3V translation using TXB0304 at 1Mhz as attached. There were no loading except for the probes which might contribute ~20pF overall.
