The output drive is specified with two current ratings: 12mA source and 12mA sink, or alternatively 32mA source and 64mA sink. The higher 32mA/64mA figure is the one to use when calculating fan-out on a heavily loaded backplane — it tells you the part can drive the characteristic impedance of a typical 50-ohm trace or a multi-drop bus segment without edge-rate degradation. The 12mA rating applies when the device is configured for lower drive to reduce ground bounce on a dense board.
The 48-BSSOP package has a 7.50mm body width and 0.295-inch lead pitch, which is the standard SSOP footprint for 48-pin wide-body devices. It is a surface-mount package, so the reflow profile follows standard lead-free (ROHS3 compliant) soldering. The 48-SSOP supplier device package is the same mechanical outline — no footprint difference between the two designators. This is not a fine-pitch BGA or QFN, so visual inspection and rework are straightforward with a hot-air station and flux.