型号 / 厂家，封装，批号，备注，订购

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QS74FCT2191CTS1 / Quality Semiconductor,Datasheet,07+,4-Bit Binary Up-Down 订购 PDF文档

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QS74FCT2193ATS1 / Quality Semiconductor,Datasheet,07+,4-Bit Binary Up-Down 订购 PDF文档