PDF PI6C557-05 Data sheet ( Hoja de datos )

Número de pieza	PI6C557-05
Descripción	PCIe 2.0 Clock Generator
Fabricantes	Pericom Semiconductor
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No Preview Available ! PI6C557-05 PCIe® 2.0 Clock Generator with 4 HCSL Outputs Product Features ÎÎPCIe® 2.0 complaint →Phase jitter - 2.1ps RMS (typ) ÎÎLVDS compatible outputs ÎÎSupply voltage of 3.3V ±5% ÎÎ25MHz crystal or clock input frequency ÎÎHCSL outputs, 0.7V Current mode differential pair ÎÎJitter 40ps cycle-to-cycle (typ) ÎÎSpread of -0.5%, -1.0%, -1.5%, and no spread ÎÎIndustrial temperature range ÎÎSpread Bypass option available ÎÎSpread and frequency selection via external pins ÎÎPackaging: (Pb-free and Green) →20-pin, 173-mil wide TSSOP Description The PI6C557-05 is a spread spectrum clock generator compliant to PCI Express® 2.0 and Ethernet requirements. The device is used for PC or embedded systems to substantially reduce Elec- tromagnetic Interference (EMI). The PI6C557-05 provides four differential (HCSL) or LVDS spread spectrum outputs. The PI6C557-05 is configured to select spread and clock selection. Using Pericom's patented Phase- Locked Loop (PLL) techniques, the device takes a 25MHz crys- tal input and produces four pairs of differential outputs (HCSL) at 100MHz and 200MHz clock frequencies. It also provides spread selection of -0.5%, -1.0%, -1.5%, and no spread. Block Diagram Pin Configuration VDD PD OE 2 S[2:0] 3 Spread Spectrum/ Output clock selection SS Circuitry 25 MHzX1/CLK crystal or clock X2 Crystal Driver PCualpliancgitors PLL 2 GND Rr(IREF) CLK0 CLK0 CLK1 CLK1 CLK2 CCLLKK23 CLK3 VDDXD S0 S1 S2 X1 X2 PD OE GNDXD IREF 1 2 3 4 5 6 7 8 9 10 20 CLK0 19 CLK0 18 CLK1 17 CLK1 16 GNDODA 15 VDDODA 14 CLK2 13 CLK2 12 CLK3 11 CLK3 All trademarks are property of their respective owners. 11-0063 1 www.pericom.com P-0.1 04/29/11 1 page PI6C557-05 PCIe® 2.0 Clock Generator with 4 HCSL Outputs Application Information LVDS Recommendations for Differential Routing L1 length, route as non-coupled 50-Ohm trace. L2 length, route as non-coupled 50-Ohm trace. RP RQ RT L3 length, route as 100Ω differential trace. L3 length, route as 100Ω differential trace. LVDS Device Routing Dimension or Value 0.5 max 0.2 max 100 100 150 Unit inch inch Ohm Ohm Ohm PI6C557-05 Clock Output L1 RQ L1’ RT RT L2’ L2 L3 L3’ RP LVDS Device Load Typical LVDS Waveform 1325 mV 1000 mV tOR 500 ps 1250 mV 1150 mV 500 ps tOF 1250 mV 1150 mV All trademarks are property of their respective owners. 11-0063 5 www.pericom.com P-0.1 04/29/11 5 Page

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