型号 / 厂家，封装，批号，备注，订购

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MM74HCT590J / National Semiconductor,Datasheet,07+,8-Bit Binary Up Coun 订购 PDF文档

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MM74HCT574WMX_NL / Fairchild Semiconductor,Datasheet,06/07+,3-STATE Octal D-Type 订购 PDF文档