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关于lm5161芯片PCB封装的一点小问题?急急急!

Other Parts Discussed in Thread: LM5161

您好,这是lm5161的封装图,其中有几处我不大明白

1   单位到底是mm还是cm?

2   图中的14*1.78和14*0.42是什么意思?是长和宽的意思还是乘的结果是长?这时候的单位又是什么?这个封装图看的真的很头疼····

3  有没有参考的画好的PCB封装?