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ICS557G-05ATR Datasheet(PDF) 1 Page - Integrated Circuit Systems |
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ICS557G-05ATR Datasheet(HTML) 1 Page - Integrated Circuit Systems |
1 / 12 page ICS557-05A MDS 557-05A E 1 Revision 011606 Integrated Circuit Systems, Inc. ● 525 Race Street, San Jose, CA 95126 ● tel (408) 297-1201 ● www.icst.com Quad Differential PCI-Express Clock Source Description The ICS557-05A is a spread-spectrum clock generator that supports PCI-Express requirements. It is used in PC or embedded systems to substantially reduce electro-magnetic interference (EMI). The device provides four differential HCSL or LVDS high-frequency outputs with spread spectrum capability. The output frequency and spread type are selectable using external pins. Features • Packaged in 20-pin TSSOP • Available in Pb (lead) free package • Supports PCI-Express applications • Four differential spread spectrum clock outputs • Spread spectrum for EMI reduction • Uses external 25 MHz clock or crystal input • Power down pin turns off chip • OE control tri-states outputs • Spread and frequency selection via external pins • Spread Bypass option available • Industrial temperature range available Block Diagram Spread Spectrum/ Output clock selection CLKOUTA CLKOUTA Rr(IREF) PLL Clock Synthesis 3 GND VDD Clock Oscillator X1 SEL[2:0] Spread Spectrum Circuitry 2 2 CLKOUTB CLKOUTD X2 25 MHz crystal or clock OE PD Optional tuning crystal capacitors CLKOUTD CLKOUTC CLKOUTC CLKOUTB |
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