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4、X163 4-bit 2-3 2-3 74X16374X163 2-3 74X163CLRN LDN ENT ENP QD QCQBQA QD*QC*QB*QA* RCO 0 X X X X X X X 0 0 0 0 0 1 0 X X X X X X D C B A 0 1 1 0 X X X X X QD QC QB QA 0 1 1 X 0 X X X X QD QC QB QA 0 1 1 1 1 0 0 0 0 0 0 0 1 0 1 1 1 1 0 0 0 1 0 0 1 0 0 1 1 1 1 0 0 1 0 0 0 1 1 0 1 1 1 1 0 0 1 1 0 1 0 0 0 1 1 1 1 . 0 1 1 1 1 1 1 1 1 0 0 0 0 1 2-3 7 725-1 10 Z=2.5 Y Y 4_bitZ2 15 D5 3 4Z 3-2 Z3-2
