My question was who makes a board that can interface with the Arduino.
No it was not, your original question was:-
Hi everyone! I am working in a project about realiable wireless communication, and I need a external memory for store data when the Arduino is out of range. So, my question is very simple. Does anybody know which is the bigger memory RAM that i can add to the arduino? Because the biggest that i found it was 23K256 (32KB), and this is too small. Thanks!
You did not ask about who makes a board you said which is the bigger memory RAM that i can add to the arduino?
Was the phrase:-
that i can add to the arduino
accompanied by any more information, like I don't want to design it myself I want to buy something someone has already made. If so I missed it.
Yes that is the concept I speak of.
So that doesn't make sense in relationship to memory access of external RAM. It would only make sense if accompanied with things like sampling rate and number of memory accesses per sample. It is not an inherent function of any particular access architecture.