PDF CY24293 Data sheet ( Hoja de datos )

Número de pieza	CY24293
Descripción	Two Outputs PCI-Express Clock Generator
Fabricantes	Cypress Semiconductor
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No Preview Available ! CY24293 Two Outputs PCI-Express Clock Generator Features ■ 25 MHz Crystal or Clock Input ■ Two sets of Differential PCI-Express Clocks ■ Pin Selectable Output Frequencies ■ Supports HCSL or LVDS Compatible Output Levels ■ Spread Spectrum Capability on all Output Clocks with Pin Selectable Spread Range ■ 16-pin TSSOP Package ■ Operating Voltage 3.3V ■ Commercial and Industrial Operating Temperature Range Functional Description CY24293 is a two output PCI-Express clock generator device intended for networking applications. The device takes 25 MHz crystal or clock input and provides two pairs of differential outputs at 25 MHz, 100 MHz, 125 MHz, or 200 MHz for HCSL, and 25 MHz or 100 MHz for the LVDS signaling standard. The device incorporates Lexmark Spread Spectrum profile for maximum electromagnetic interference (EMI) reduction. The spread type and amount can be selected using select pins. Logic Block Diagram VDDX VDDO XIN/EXCLKIN (25 MHz) XOUT SS0 SS1 S0 S1 OE Clock Buffer/ Crystal Oscillator Control Logic PLL Clock Synthesizer GNDX GNDO PCIE0P PCIE0N PCIE1P PCIE1N I REF R REF= 475 Ohms 1% Cypress Semiconductor Corporation • 198 Champion Court Document Number: 001-46117 Rev. C www.DataSheet.in • San Jose, CA 95134-1709 • 408-943-2600 Revised April 02, 2009 [+] Feedback 1 page CY24293 LVDS Compatible Layout Guidelines Table 7. Common Recommendations for Differential Routing Differential Routing[2] Dimension or Value L1 length, route as noncoupled 50Ω trace 0.5 max L2 length, route as noncoupled 50Ω trace 0.2 max L3 length, route as noncoupled 50Ω trace 0.2 max RP 100 RQ 150 RS 33 RT 49.9 Table 8. LVDS Device Differential Routing Differential Routing[2] L4 length, route as coupled microstrip 100Ω differential trace L4 length, route as coupled stripline 100Ω differential trace Dimension or Value 2 to 32 1.8 to 30 Figure 4. LVDS Device Routing Unit inch inch inch Ω Ω Ω Ω Unit inch inch Rs L1 L2 RQ Rs L1 L2 L4 L4 Output Buffer RT RT L3 L3 RP LVDS Device Input Note 2. Refer to Figure 4. Document Number: 001-46117 Rev. C www.DataSheet.in Page 5 of 10 [+] Feedback 5 Page

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