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DM7495N Arkusz danych(PDF) 3 Page - National Semiconductor (TI) |
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DM7495N Arkusz danych(HTML) 3 Page - National Semiconductor (TI) |
3 / 6 page Switching Characteristics at VCC e 5V and TA e 25 C (See Section 1 for Test Waveforms and Output Load) Symbol Parameter From (Input) RL e 400X CL e 15 pF Units To (Output) Min Max fMAX Maximum Clock Frequency 25 MHz tPHL Propagation Delay Time Clock to 35 ns High to Low Level Output Output tPLH Propagation Delay Time Clock to 35 ns Low to High Level Output Output Function Table Inputs Outputs Mode Clocks Serial Parallel QA QB QC QD Control 2(L) 1(R) A B C D HH X X X X X X QA0 QB0 QC0 QD0 H v XXa b c d a b c d H v XX QB QC QD dQBn QCn QDn d LL H X X X X X QA0 QB0 QC0 QD0 LX v HX X X X H QAn QBn QCn LX v LX X X X L QAn QBn QCn u LL X X X X X QA0 QB0 QC0 QD0 v LL X X X X X QA0 QB0 QC0 QD0 v LH X X X X X QA0 QB0 QC0 QD0 u HL X X X X X QA0 QB0 QC0 QD0 u HH X X X X X QA0 QB0 QC0 QD0 Shifting left requires external connection of QB to A QC to B QD to C Serial data is entered at input D H e High Level (Steady State) L e Low Level (Steady State) X e Don’t Care (Any input including transitions) v e Transition from high to low level u e Transition from low to high level a b c d e The level of steady state input at inputs A B C or D respectively QA0 QB0 QC0 QD0 e The level of QA QB QC QD respectively before the indicated steady state input conditions were established QAn QBn QCn QDn e The level of QA QB QC QD respectively before the most recent v transition of the clock Logic Diagram TLF6534 – 2 3 |
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