型號(hào) / 廠家，封裝，批號(hào)，備注，訂購(gòu)

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QS74FCT2191ATS1 / Quality Semiconductor,Datasheet,06/07+,4-Bit Binary Up-Down 訂購(gòu) PDF文檔

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QS74FCT2191CTP / Quality Semiconductor,Datasheet,07+,4-Bit Binary Up-Down 訂購(gòu) PDF文檔

QS74FCT2191CTS1 / Quality Semiconductor,Datasheet,07+,4-Bit Binary Up-Down 訂購(gòu) PDF文檔