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M74HC299F1R Datasheet(PDF) 2 Page - STMicroelectronics |
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M74HC299F1R Datasheet(HTML) 2 Page - STMicroelectronics |
2 / 15 page INPUT AND OUTPUT EQUIVALENT CIRCUIT TRUTH TABLE MODE INPUTS INPUTS/OUTPUTS OUTPUTS CLEAR FUNCTION SELECTED OUTPUT CONTROL CLOCK SERIAL A/QA H/QH QA’ QH’ S1 S0 G1 * G2 * (299) (323) SL SR Z L H H X XXX X Z Z L L CLEAR L L X LLX X X L L L L L X LL L X X X LLL L HOLD H L L L L X X X QA0 QH0 QA0 QH0 SHIFT RIGHT H L H L L X H H QGn H QGn H L H L L X L L QGn L QGn SHIFT LEFT H H L L L H X QBn H QBn H H H L L L L X QBn L QBn L LOAD H H H X X X X a h a h * When one or both output controls are high, the eight, input/output terminals are in the high impedance state: however sequential operation or clearing of the register is not affected. Z : HIGH IMPEDANCE Qn0 : THE LEVEL OF An BEFORE THE INDICATED STEADY STATE INPUT CONDITIONS WERE ESTABLISHED. Qnn : THE LEVEL ON Qn BEFORE THE MOST RECENT ACTIVE TRANSITION INDICATED BY OR a, h : THE LEVEL OF THE STEADY STATE INPUTS A, H, RESPECTIVELY. X : DON’T CARE M54/M74HC299/323 2/15 |
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