Hi again,
I have found a couple of figures (Figure 51/52. Typical Output Rise/Fall Time) with time data depending of capacitance load and at half and full drive (not sure what it is), but i am not sure which to have into account. The same with output impedance, some figures show current vs voltage but i am not sure to figurate out Zout from these in data pins...in DDR2 case...there's no current @1.8V. I get high Zout values from any calculation that i do from this table. I guess Zout should be less than 50ohms at least.
BR
Carlos M