What is typ ( in a datasheet )
typ stands for typical.

This is the typical value of the specification a part; the actual distribution of a population of parts will vary, but the typical value should be representative of the distribution of a large population of parts.

Sometimes a parameter will have a typical value and no minimum and/or maximum values in a data sheet.  In this case, the value of this parameter is not gauranteed by the manufacturer.  If a specification has a minimum or maximum value, it is usually gauranteed by production test or gauranteed by design.