双列直插封
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。
在20世纪70年代芯片封
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的还是双列直插封
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。DIP封
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在当时具有适合PCB(印刷电路板)的穿孔安
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、易于对PCB布
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以及操作
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为方便等特点。其封
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的结构形式也很多,包括多层陶瓷双列直插式DIP、单层陶瓷双列直插式DIP
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框架式DIP等等。
但是衡量一个芯片封
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技术先进与否的重要指标是芯片面积与封
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面积之比,这个比值越接近1越好。以一颗采用40根I/O
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脚塑料双列直插式封
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(PDIP)的芯片为例,其芯片面积∶封
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面积为1∶86,离l相差很远。不难看出,这种封
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尺寸比芯片
欧 路 软 件版 权 所 有