Recently I bought an ethernet switch controller based on the Realtek RTL8305NB chip. It was bought as a proof of concept for my robot. Unfortunately, the board is too big and I want to design my own 2-layer PCB (also to learn new stuff). I would like to use the same chip, but finding its datasheet is almost impossible (I even contacted manufacturer and few shops - no result). Does anybody know a similar chip? Why is the datasheet for RTL8305NB so hard to find?
What I need:
- 10/100 MBPS,
- at least 3 ports,
- package for 2-layer board (not BGA).
I am new to the ethernet technology and I will appreciate any help and piece of advice.