在有些技术上，电源和接地引脚会伸出到边界或者边界外面。
In some technologies, power and ground pins extend to the edge or outside the boundary.
绝大多数的逻辑器件的接地引脚都设计在封装的某个角，所以金属框可以方便地接地。
Most LOGIC CIRCUITs have a ground pin at one of the PACKAGE corners and therefore the lid is grounded.
一般来说，这个引脚接地，但它可连接到任何电压参考。
Generally, this pin is grounded, but it can be tied to any voltage reference.
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