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M74HCT648 데이터시트(PDF) 3 Page - STMicroelectronics |
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M74HCT648 데이터시트(HTML) 3 Page - STMicroelectronics |
3 / 12 page TRUTH TABLE HCT646 (The truth table for HCT648 is the same as this, but with the outputs inverted) G DIR CAB CBA SAB SBA A B FUNCTION HX INPUTS INPUTS Both the A bus and the B bus are inputs X X X X Z Z The output functions of the A and B bus are disabled X X INPUTS INPUTS Both the A and B bus are used for inputs to the internal flip-flops. Data at the bus will be stored on low to high transition of the clock inputs LH iNPUTS OUTPUTS The A bus are inputs and the B bus are outputs X X* L X L L The data at the A bus are displayed at the B bus HH X* L X L L The data at the A bus are displayed at the B bus. The data of the A bus are stored to the internal flip-flop on low to high transition of th clock pulse. HH X X* H X X Qn The data stored to the internal flip-flop are dispayed at the B bus X* H X L L The data at the A bus are stored to the internal flip- flop on low to high transition of the clock pulse. The states of the internal flip-flops output directly to the B bus HH LL OUTPUTS INPUTS The A bus are outputs and the B bus are inputs X* X X L L L The data at the B bus are displayed at the A bus HH X* X L L L The data at the B bus are displayed at the A bus. The data of the B bus are stored to the internal flip- flop on low to high transition of the clock pulse HH X* X X H Qn X The data stored to the internal flip-flops are displayed at the B bus x* X H L L the data at the B bus are stored to the internal flip- flop on low to high transition of the clock pulse. The states of the internal flip-flops output directly to the A bus HH X : DON’T CARE Z : HIGH IMPEDANCE Qn : THE DATA STORED TO THE INTERNAL FLIP-FLOPS BY MOST RECENT LOW TO HIGH TRANSITION OF THE CLOCK INPUTS * : THE DATA AT THE A AND B BUS WILL BE STORED TO THE INTERNAL FLIP-FLOPS ON EVERY LOW TO HIGH TRANSITION OF THE CLOCK INPUTS M74HCT646/648 3/12 |
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