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ICS844256AMLF Datasheet(PDF) 1 Page - Integrated Circuit Systems |
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ICS844256AMLF Datasheet(HTML) 1 Page - Integrated Circuit Systems |
1 / 13 page 844256AM www.icst.com/products/hiperclocks.html REV. A NOVEMBER 29, 2005 1 Integrated Circuit Systems, Inc. ICS844256 FEMTOCLOCKS™CRYSTAL-TO-LVDS FREQUENCY SYNTHESIZER W/INTEGRATED FANOUT BUFFER PRELIMINARY GENERAL DESCRIPTION The ICS844256 is a Crystal-to-LVDS Clock Synthesizer/Fanout Buffer designed for SONET and Gigabit Ethernet applications and is a member of the HiperClockS™ family of High Performance Clock Solutions from ICS. The output frequency can be set using the frequency select pins and a 25MHz crystal for Ethernet frequencies, or a 19.44MHz crystal for SONET. The low phase noise charac- teristics of the ICS844256 make it an ideal clock for these demanding applications. BLOCK DIAGRAM PIN ASSIGNMENT FEATURES • Six LVDS outputs • Crystal oscillator interface • Output frequency range: 62.5MHz to 622.08MHz • Crystal input frequency range: 15.625MHz to 25.5MHz • RMS phase jitter at 125MHz, using a 25MHz crystal (1.875MHz to 20MHz): 0.48ps (typical) • Full 3.3V or 3.3V core, 2.5V output supply mode • 0°C to 70°C ambient operating temperature • Industrial temperature information available upon request • Available in both standard and lead-free RoHS-compliant packages HiPerClockS™ ICS Q0 ICS844256 24-Lead, 300-MIL SOIC 7.5mm x 15.33mm x 2.3mm body package M Package Top View VDDO VDDO nQ2 Q2 nQ1 Q1 nQ0 Q0 PLL_BYPASS VDDA VDD FB_SEL 1 2 3 4 5 6 7 8 9 10 11 12 Q3 nQ3 Q4 nQ4 Q5 nQ5 N_SEL1 GND GND N_SEL0 XTAL_OUT XTAL_IN OSC PLL Feedback Divider Output Divider 1 0 XTAL_IN XTAL_OUT PLL_BYPASS nQ0 24 23 22 21 20 19 18 17 16 15 14 13 Q1 nQ1 Q2 nQ2 Q3 nQ3 Q4 nQ4 Q5 nQ5 FB_SEL N_SEL1 N_SEL0 Pullup Pulldown Pullup Pullup 24-Lead TSSOP 4.40mm x 7.8mm x 0.92mm body package G Package Top View SELECT FUNCTION TABLE s t u p n In o i t c n u F L E S _ B F1 L E S _ N0 L E S _ Ne d i v i D Me d i v i D NN / M 00 0 5 21 5 2 00 1 5 22 5 . 2 1 01 0 5 24 5 2 . 6 01 1 5 25 5 10 0 2 31 2 3 10 1 2 32 6 1 11 0 2 34 8 11 1 2 38 4 The Preliminary Information presented herein represents a product in prototyping or pre-production. The noted characteristics are based on initial product characterization. Integrated Circuit Systems, Incorporated (ICS) reserves the right to change any circuitry or specifications without notice. |
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