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GENERAL DESCRIPTION

The 9DB206 is a high perfromance 1-to-6 Differential-to-HCSL

Jitter Attenuator designed for use in PCI Express? systems. In

some PCI Express systems, such as those found in desktop PCs,

the PCI Express clocks are generated from a low bandwidth,

high phase noise PLL frequency synthesizer. In these systems, a

jitter-attenuating device may be necessary in order to reduce high

frequency random and deterministic jitter components from the PLL

synthesizer and from the system board. The 9DB206 has two PLL

bandwidth modes. In low bandwidth mode, the PLL loop bandwidth

is 500kHz. This setting offers the best jitter attenuation and is still

high enough to pass a triangular input spread spectrum profi le. In

high bandwidth mode, the PLL bandwidth is at 1MHz and allows

the PLL to pass more spread spectrum modulation.

For serdes which have x10 reference multipliers instead of x12.5

multipliers, 5 of the 6 PCI Express outputs (PCIEX1:5) can be set

for 125MHz instead of 100MHz by confi guring the appropriate

frequency select pins (FS0:1). Output PCIEX0 will always run at

the reference clock freq

Features

? Six 0.7V current mode differential HCSL output pairs

? One differential clock input

? CLK and nCLK supports the following input types:

LVPECL, LVDS, LVHSTL, SSTL, HCSL

? Maximum output frequency: 140MHz

? Input frequency range: 90MHz - 140MHz

? VCO range: 450MHz - 700MHz

? Output skew: 110ps (maximum)

? Cycle-to-Cycle jitter: 110ps (maximum)

? RMS phase jitter @ 100MHz, (1.5MHz - 22MHz):

2.42ps (typical)

? 3.3V operating supply

? 0°C to 70°C ambient operating temperature

? Available in lead-free RoHS compliant package

? Industrial temperature information available upon request