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VSC8541-02 データシート(PDF) 78 Page - Microchip Technology |
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VSC8541-02 データシート(HTML) 78 Page - Microchip Technology |
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78 / 101 page  Electrical Specifications VMDS-10513 VSC8541-02 Datasheet Revision 4.1 69 Figure 24 • Test Circuit for Recovered Clock Outputs Signal 5.2.3 CLKOUT This section provides the AC characteristics for the CLKOUT signal. The following table shows the AC specifications for the CLKOUT output. 5.2.4 RMII_CLKOUT This section provides the AC characteristics for the RMII_CLKOUT signal. Note: The RMII_CLKOUT signal is provided on the RX_CLK pin (see Table 3, page 6) when the device is operating in RMII mode. The following table shows the AC specifications for RMII_CLKOUT. Table 101 • CLKOUT AC Characteristics Parameter Symbol Minimum Typical Maximum Unit Condition CLKOUT frequency ƒ 125 MHz CLKOUT frequency ƒ 50 MHz CLKOUT frequency ƒ 25 MHz CLKOUT cycle time tCOCYC 8ns CLKOUT cycle time tCOCYC 20 ns CLKOUT cycle time tCOCYC 40 ns Frequency stability ƒSTABILITY 5 ppm Relative to device REFCLK frequency Duty cycle DC 40 50 60 % CLKOUT at 25 MHz and 125 MHz Duty cycle DC 35 50 75 % CLKOUT at 50 MHz Clock rise time and fall time tR, tF 1.5 ns 20% to 80% Peak-to-peak jitter JPPCLKOUT 700 ps 10 k samples Table 102 • RMII_CLKOUT AC Characteristics Parameter Symbol Minimum Typical Maximum Unit RMII_CLKOUT frequency ƒ 50 MHz RMII_CLKOUT duty cycle DC 35 65 % RMII_CLKOUT rise time tR 1ns RMII_CLKOUT fall time tF 1ns Device Under Test Signal Measurement Point 50 Ω 1 ns T-line 39 Ω 5.1 pF |
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