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丝印MC74F32DR MC74F299N MC74F283N MC74F280N MC74F280D
丝印MC74F32M MC74F32J MC74F32D MC74F280 MC74F257
贴插MC33153D-74LS221P-74LS221N-74F280BN-74HCT86E
MC74F280D【PARITY GENERATOR/CHECKER 9 BIT 1】