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UPD720100AGM-8ED Datasheet(PDF) 21 Page - NEC |
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UPD720100AGM-8ED Datasheet(HTML) 21 Page - NEC |
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21 / 32 page  Data Sheet S15535EJ2V0DS 21 µµµµPD720100A (2/2) Parameter Symbol Conditions MIN. MAX. Unit High-speed Source Electrical Characteristics Rise time (10% - 90%) tHSR 500 ps Fall time (90% - 10%) tHSF 500 ps Driver waveform See Figure 2-6. High-speed Data Rate tHSDRAT 479.760 480.240 Mbps Microframe Interval tHSFRAM 124.9375 125.0625 µs Consecutive Microframe Interval Difference tHSRFI 4 high- speed Bit times Data source jitter See Figure 2-6. Receiver jitter tolerance See Figure 2-4. Hub event Timings Time to detect a downstream facing port connect event tDCNN 2.5 2000 µs Time to detect a disconnect event at a downstream facing port: tDDIS 2.0 2.5 µs Duration of driving resume to a downstream port tDRSMDN Nominal 20 ms Time from detecting downstream resume to rebroadcast. tURSM 1.0 ms Inter-packet Delay for packets traveling in same direction for high-speed tHSIPDSD 88 Bit times Inter-packet Delay for packets traveling in opposite direction for high-speed tHSIPDOD 8Bit times Inter-packet delay for root hub response for high-speed tHSRSPIPD1 192 Bit times Time for which a Chirp J or Chirp K must be continuously detected during Reset handshake tFILT 2.5 µs Time after end of device Chirp K by which hub must start driving first Chirp K tWTDCH 100 µs Time for which each individual Chirp J or Chirp K in the chirp sequence is driven downstream during reset tDCHBIT 40 60 µs Time before end of reset by which a hub must end its downstream chirp sequence tDCHSE0 100 500 µs |
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