Hi Alex,
We don't seem to have any official minimum specs.
Here is an old document in which different (now fairly old) hardware models were discussed in the past Hardware Information
My guess would be that 8GB would be more than enough RAM to give optional performance. As for minimum, I would recommend 3GB. (However most of the time 2GB would likely work fine. If a device only had 1GB I wouldn't be surprised if problems were experienced with normal usage).
I don't have any recommendation about specific android processors, but if I were spec-ing out tablets for Paratext Lite, I would compare the processor on cpu bench mark .