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SM802105 Datasheet(PDF) 3 Page - Micrel Semiconductor |
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SM802105 Datasheet(HTML) 3 Page - Micrel Semiconductor |
3 / 11 page Micrel, Inc. SM802105 April 2011 3 M9999-042111-A hbwhelp@micrel.com or (408) 955-1690 Pin Description (Continued) Pin Number Pin Name Pin Type Pin Level Pin Function 5, 11, 16, 18 TEST Factory Test pins, Do not connect anything to these pins. 1 VDD PWR Core Power Supply 13, 14, 15 VSS PWR Core Power Supply Ground 17 VDDO1 PWR Power Supply for Output Bank 1 21 VSSO1 PWR Power Supply Ground for Output Bank 1 8 REF_IN I, (SE) LVCMOS Reference Clock Input 9 XTAL_IN I, (SE) 12pF crystal Crystal Reference Input, no load caps needed. See Fig. 5. 10 XTAL_OUT O, (SE) 12pF crystal Crystal Reference Output, no load caps needed. See Fig. 5. 6 FSEL I, (SE) LVCMOS Frequency Select, 1 = 156.25MHz, 0 = 312.5MHz, 45KΩ pull-up 7 OE1 I, (SE) LVCMOS Output Enable, Q1 disables to tri-state, 0 = Disabled, 1 = Enabled, 45KΩ pull-up 12 OE2 I, (SE) LVCMOS Output Enable, Q2 disables to tri-state, 0 = Disabled, 1 = Enabled, 45KΩ pull-up Application Information Input Reference When operating with a crystal input reference, do not apply a switching signal to REF_IN. Crystal Layout Keep the layers under the crystal as open as possible. Do not place switching signals or noisy supplies under the crystal. Truth Tables PLL_BYPASS XTAL_SEL INPUT OUTPUT 0 − − PLL 1 − − XTAL/REF_IN − 0 REF_IN − − 1 XTAL − FSEL Output Frequency (MHz) 0 312.5 1 156.25 |
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