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TNETX4090GGP Datasheet(PDF) 65 Page - Texas Instruments |
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TNETX4090GGP Datasheet(HTML) 65 Page - Texas Instruments |
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65 / 78 page ![]() TNETX4090 ThunderSWITCH II™ 9-PORT 100-/1000-MBIT/S ETHERNET™ SWITCH SPWS044E – DECEMBER 1997 – REVISED AUGUST 1999 65 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 PMA and GMII clock (see Figure 20) NO. MIN MAX UNIT 1 tr(Mxx_GCLK) Pulse width low, Mxx_RFCLK 2.5 ns 2 th(Mxx_GCLK) Pulse width high, Mxx_RFCLK 2.5 ns 3 tw(Mxx_GCLK) Cycle time, Mxx_RFCLK 8 ns PMA and GMII clock (see Figure 20) NO. MIN MAX UNIT 1 tr(Mxx_GCLK) Rise time, Mxx_RFCLK 1 ns 2 tf(Mxx_GCLK) Fall time, Mxx_RFCLK 1 ns 3 Accuracy 100 PPM duty cycle 40% 60% † tr and tf are measured between 20% and 80%, VDD(3.3-V) = min, output load (GTCLK) = 20pf. Mxx_RFCLK 1 2 3 Figure 20. GMII Clock |
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