We need a very small footprint chip and a very low propagation delay to select between different clocks in our boards. A clock switch has too much propagation delay or part to part skew. We are using this switch TS3USB3031, but it seems to affect the phase noise performance of our onboard oscillator.
So if we directly connect a single ended oscillator on the USB+ pin and the USB- to GND, what could affect our oscillator?
We are thinking of a capacitive/resistive load problem (we bypass the switch and everything is good or we select the other path who is coming from an external clock and it's good too). So the performance of the switch can be good with an external clock, but affect our onboard oscillator.
In the datasheet, I can find Ron and Con, but there is no diagram of how it is inside...does the Con is in series or parallel? if in series, what is the input pin capacitance on USB pins?
Thanks
