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PI6LC48P03LEX Datasheet(PDF) 7 Page - Pericom Semiconductor Corporation |
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PI6LC48P03LEX Datasheet(HTML) 7 Page - Pericom Semiconductor Corporation |
7 / 10 page 7 www.pericom.com PI6LC48P03 Rev. C 5/7/2015 PI6LC48P03 3-Output LVPECL Networking Clock Generator Recommendations for Unused Input and Output Pins Inputs: Crystal Inputs: For applications not requiring the use of the crystal oscillator input, both XTAL_IN and XTAL_OUT can be left floating. A 1kΩ resistor can be tied from XTAL_IN to ground for additional protection. Ref_IN Input: For applications not requiring the use of the clock, it can be left floating. A 1kΩ resistor tied from the Ref_IN to ground can provide additional protection. LVCMOS Control Pins: All control pins have internal pulldowns/pullups; A 1kΩ resistor tied from internal pulldown control pins to ground, and a 4.7kΩ tied from internal pullup control pins to power supply can provide additional protection. Outputs: LVPECL Outputs: All unused LVPECL outputs can be left floating. Crystal Input Interface The clock generator has been characterized with 18pF parallel resonant crystals. The capacitor values shown in the figure below were determined using a 31.25MHz or 26.041666MHz, 18pF parallel resonant crystal and were chosen to minimize the ppm error. C1 33pF C2 27pF XTAL_IN XTAL_OUT X1 18pF Parallel Crystal 15-0059 |
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