ICS874005

Integrated Circuit Systems, Inc. ICS874005 www.DataSheet4U.com PCI EXPRESS™ JITTER ATTENUATOR FEATURES Five differential LVDS output pairs One differential clock input CLK and nCLK supports the following input types: LVPECL, LVDS, LVHSTL, SSTL, HCSL Output frequency range: 98MHz - 160MHz Input frequency range: 98MHz - 128MHz VCO range: 490MHz - 640MHz Cycle-to-cycle jitter: 30ps (maximum) 3.3V operating supply 3 bandwidth modes allow the system designer to make jitter attenuation/tracking skew design trade-offs 0°C to 70°C ambient operating temperature Available in both standard and lead-free RoHS compliant packages GENERAL DESCRIPTION The ICS874005 is a high performance Differential-to-LVDS Jitter Attenuator designed for HiPerClockS™ 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 attenuator may be required to attenuate high frequency random and deterministic jitter components from the PLL synthesizer and from the system board. The ICS874005 has 3 PLL bandwidth modes: 200kHz, 400kHz, and 800kHz. The 200kHz mode will provide maximum jitter attenuation, but with higher PLL tracking skew and spread spectrum modulation from the motherboard synthesizer may be attenuated. The 400kHz provides an intermediate bandwidth that can easily track triangular spread profiles, while providing go...