Datasheet part dimensions
As indicated on the drawing, the first number is inches and the number in parentheses is millimeters. When two values are given they are the minimum and maximum dimensions.

The part itself appears to be a pretty standard SOIC package, but TI recommends a very non-standard PCB footprint for best results. This layout is provided and discussed in the datasheet.

As always, you should make sure you have a good layout by printing the copper layers at 1X scale on paper, then placing the actual components where they are supposed to go. Really, do it.