56-pin SSOP buffer — what the supply voltage tells you
That supply ceiling means it is a 5 V tolerant part, not a 3.3 V only device — it will run on a 5 V rail with margin for transients, or on a 3.3 V rail if the logic levels align. The 56-pin SSOP footprint is the standard wide-body SSOP with 0.635 mm pitch, common on telecom line cards and backplane buffers where you need 16 or 20 bits of unidirectional drive.