9FG430

DATASHEET Four Output Differential Frequency Generator for PCIe Gen3 and QPI 9FG430 General Description: The 9FG430 is a Frequency Timing Generator that provides 4 HCSL differential output pairs. These outputs support PCI-Express Gen3, and QPI applications. The part supports Spread Spectrum and synthesizes several additional output frequencies from either a 14.31818 MHz crystal, a 25 MHz crystal or reference input clock. The 9FG430 also outputs a copy of the reference clock. Complete control of the device is available via strapping pins or via the SMBus inteface. Recommended Application: 4 Output Differential Frequency Generator for PCIe Gen3 and QPI Output Features: 4 - 0.7V current mode differential HCSL output pairs 1 - 3.3V LVTTL REF output Features/Benefits: Pin-to-Pin with 9FG104D/Easy upgrade to PCIe Gen3 Generates common frequencies from 14.318 MHz or 25 MHz; single part supports mulitple applications Provides copy of reference output; eleminates need for additional crystal or oscillator Unused outputs may be disabled in Hi-Z; save system power Device may be configured by SMBus and/or strap pins; can be used in systems without SMBus Key Specifications: Cycle-to-cycle jitter: < 50ps with 25MHz input Output-to-output skew: <50ps Phase jitter: PCIe Gen3 < 1ps rms Phase jitter: QPI 9.6GB/s < 0.2ps rms 10 ppm synthesis error with 25MHz input and Spread Off Functional Block Diagram XIN/CLKIN X2 OSC REFOUT PROGRAMMABLE SPREAD PLL STOP LOGIC ...