型号 / 厂家，封装，批号，备注，订购

SN54LS687 / Texas Instruments,Datasheet,06/07+,8-BIT MAGNITUDE/IDEN 订购 PDF文档

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SN54LS681 / Texas Instruments,Datasheet,06/07+,4-BIT PARALLEL BINAR 订购 PDF文档

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