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SM802121UMGTR Datasheet(PDF) 3 Page - Micrel Semiconductor |
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SM802121UMGTR Datasheet(HTML) 3 Page - Micrel Semiconductor |
3 / 10 page Micrel, Inc. SM802121 January 2012 3 M9999-011212-A hbwhelp@micrel.com or (408) 955-1690 Pin Description Pin Number Pin Name Pin Type Pin Level Pin Function 16, 17 /Q, Q O, (DIF) LVPECL Differential Clock Output 156.25MHz. 1, 18 VDDO PWR Power Supply for Output. 2, 22 VSSO PWR Power Supply Ground for Output. 6 XTAL_SEL I, (SE) LVCMOS Selects PLL Input Reference Source (0 = REF_IN, 1 = XTAL, 45KΩ pull-up). 3, 4, 20, 21, 23, 24 NC No Connect. Do not connect anything to these pins. 5, 7, 12, 15, 19 TEST Factory Test Pins. Do not connect anything to these pins. 8 VDD PWR Core Power Supply. 13, 14 VSS (Exposed Pad) PWR Core Power Supply Ground. The exposed pad must be connected to the VSS ground plane. 9 REF_IN I, (SE) LVCMOS Reference Clock Input. 10 XIN I, (SE) crystal Crystal Reference Input. No load caps needed. (See Fig. 5) 11 XOUT O, (SE) crystal Crystal Reference Output. No load caps needed. (See Fig. 5) 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 and do not place switching signals or noisy supplies under the crystal. Crystal load capacitance is built inside the die so no external capacitance is needed. See the Selecting a quartz crystal for the Clockworks Flex I Family of Precision Synthesizers application note for further details. Contact Micrel’s HBW applications group if you need assistance on selecting a suitable crystal for your application at hbwhelp@micrel.com Truth Table XTAL_SEL INPUT 0 REF_IN 1 XTAL |
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