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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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PDIUSBH12D 데이터시트(PDF) 22 Page - NXP Semiconductors |
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PDIUSBH12D 데이터시트(HTML) 22 Page - NXP Semiconductors |
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22 / 28 page  Philips Semiconductors Product specification PDIUSBH12 USB 2-port hub 1999 Jul 22 22 CROSSOVER POINT CROSSOVER POINT CROSSOVER POINT SV00514 CROSSOVER POINT Hub Delay Downstream tHDD Hub Delay Upstream tHDD DOWNSTREAM DIFFERENTIAL DATA UPSTREAM- DIFFERENTIAL DATA UPSTREAM DIFFERENTIAL DATA DOWNSTREAM- DIFFERENTIAL DATA VDD VSS VSS A. DOWNSTREAM HUB DELAY B. UPSTREAM HUB DELAY SOP DISTORTION tSOP = tHDD(SOP) – tHDD (NEXT J) LOW SPEED TIMINGS ARE DETERMINED IN THE SAME WAY FOR: tLHDD AND tLSOP Figure 2. Hub Differential Data Delay and SOP distortion UPSTREAM- DIFFERENTIAL DATA DOWNSTREAM- DIFFERENTIAL DATA VDD VSS VSS A. DOWNSTREAM EOP DELAY B. UPSTREAM EOP DELAY EOP DELAY tEOPD = tEOP– EOP DELAY RELATIVE TO tHDD tEOPDR = tEOPD – tHDD EOP SKEW tHESK = tEOP+ – tEOP– LOW SPEED TIMINGS ARE DETERMINED IN THE SAME WAY FOR: tLEOPD, tLEOPDR, AND tLHESK tEOP+ tEOP– CROSSOVER POINT EXTENDED CROSSOVER POINT EXTENDED UPSTREAM END OF CABLE DOWNSTREAM PORT tEOP+ tEOP– CROSSOVER POINT EXTENDED CROSSOVER POINT EXTENDED SV00515 Figure 3. Hub EOP Delay and EOP Skew |
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