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GS1661 Datasheet(PDF) 28 Page - Semtech Corporation |
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GS1661 Datasheet(HTML) 28 Page - Semtech Corporation |
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28 / 84 page ![]() GS1661 HD/SD SDI Receiver Data Sheet 53751 - 3 September 2012 28 of 84 Figure 4-2: 27MHz Clock Sources External Crystal Connection XTAL1 XTAL2 XTAL1 XTAL2 External Clock Source Connection 16pF 16pF External Clock NC K6 K6 J6 J6 Notes: 1. Capacitor values listed represent the total capacitance, including discrete capacitance and parasitic board capacitance. 2.XTAL1 serves as an input, which may alternatively accept a 27MHz clock source. Table 4-3: Input Clock Requirements Parameter Min Typ Max UOM Notes XTAL1 Low Level Input Voltage (Vil) −− 20% of VDD_IO V 3 XTAL1 High Level Input Voltage (Vih) 80% of VDDIO −− V3 XTAL1 Input Slew Rate 2 −− V/ns 3 XTAL1 to XOUT Prop. Delay (High to Low) 1.3 1.5 2.3 ns 3 XTAL1 to XOUT Prop. Delay (Low to High) 1.3 1.6 2.3 ns 3 NOTES: Valid when the cell is used to buffer an external clock source which is connected to the XTAL1 pin, then nothing should be connected to the XTAL2 pin. |
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