ive nor gate 異或非門74hc73 dual j-k flip-flop w/clear 雙jk觸發(fā)器74hc74a preset/clear d flip-flop 雙d觸發(fā)器74hc75 4bit bistable latch 4位雙穩(wěn)鎖存器74hc76 preset/clear jk flip-flop 雙jk觸發(fā)器74hc85 4bit magnitude comparator 4位判決電路74hc86 2input exclusive or gate 2輸入異或門74hc942 baud