I would need a buffer for an 1-Wire BUS. I find ADG3301.
1. I want to connect VCCA and VCCY both with 5V, what happens? On the first page I find: For proper operation, VCCA must always be less than VCCY. Is there a better alternative for my case?
I think the fastest signal is an 1us pulse. I want to connect max. 3 buffers in series.
I would recommend to have a look at the LTC4315, a 2-Wire Bus Buffer with High Noise Margin for I2C interface. This might be suitable for your 5V to 3.3V level translation with buffers.
Let me know if this helps.