问题描述：
英语翻译
The PLCC and LCCC packages have leads arranged on all four sides.Pin 1 is indicated by a dot or other index mark and is located at the center of one set of leads.The pin number increase going counterclockwise as viewed from the of the package.The highest pin number is always to the right of pin 1.Figure 7-4(b)illustrates this format for a 20-pin PLLC package.
The PLCC and LCCC packages have leads arranged on all four sides.Pin 1 is indicated by a dot or other index mark and is located at the center of one set of leads.The pin number increase going counterclockwise as viewed from the of the package.The highest pin number is always to the right of pin 1.Figure 7-4(b)illustrates this format for a 20-pin PLLC package.
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