型号 / 厂家，封装，批号，备注，订购

SN74AHC258D / ,SOIC,07+,010-62104891 订购 PDF文档

SN74AHC273DB / ,SSOP,07+,010-62104891 订购 PDF文档

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SN74AHC273DGVR / TI,,05+,010-66001623/66001621 订购 PDF文档

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