REFOUT DATASHEET Eight Output Differential Frequency Generator 9FG830 for PCIe Gen3 and QPI Features/Benefits: General Description: Pin-to-Pin with 9FG108D Easy upgrade to PCIe Gen3 The 9FG830 is a Frequency Timing Generator that provides 8 HCSL differential output pairs. These outputs support PCI-Express Generates common frequencies from 14.318 MHz or 25 Gen3, and QPI applications. The part supports Spread Spectrum MHz single part supports mulitple applications and synthesizes several additional output frequencies from either Provides copy of reference output eleminates need for a 14.31818 MHz crystal, a 25 MHz crystal or reference input clock. additional crystal or oscillator The 9FG830 also outputs a copy of the reference clock. Complete Three spread spectrum modes: -0.5%, +/-0.25%, and off control of the device is available via strapping pins or via the EMI reduction SMBus interface. Unused outputs may be disabled in Hi-Z save system power Recommended Application: Device may be configured by SMBus and/or strap pins 8 Output Differential Output Frequency Generator for PCIe Gen3 can be used in systems without SMBus and QPI Key Specifications: Output Features: Cycle-to-cycle jitter: < 50ps with 25MHz input 8 - 0.7V current mode differential HCSL output pairs Output-to-output skew: <50ps 1 - 3.3V LVTTL REF output 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 OSC X2 OE(7:0) 8 PROGRAMMABLE STOP DIF(7:0) SPREAD PLL LOGIC SPREAD SEL14M 25M CONTROL DIF STOP LOGIC FS(2:0) SDATA SCLK IREF IDT Eight Output Differential Frequency Generator for PCIe Gen3 and QPI 1680E04/04/17 19FG830 Eight Output Differential Frequency Generator for PCIe Gen3 and QPI Pin Configuration XIN/CLKIN 1 48 VDDA X2 2 47 GNDA VDD 3 46 IREF GND 4 45 vFS0 REFOUT 5 44 vFS1 vFS2 6 43 vOE 0 vOE 7 7 42 DIF 0 DIF 7 8 41 DIF 0 DIF 7 9 40 VDD VDD 10 39 DIF 1 DIF 6 11 38 DIF 1 DIF 6 12 37 OE 1 OE 6 13 36 VDD VDD 14 35 GND GND 15 34 OE 2 OE 5 16 33 DIF 2 DIF 5 17 32 DIF 2 DIF 5 18 31 VDD VDD 19 30 DIF 3 DIF 4 20 29 DIF 3 DIF 4 21 28 vOE 3 vOE 4 22 27 SEL14M 25M SDATA 23 26 vSPREAD SCLK 24 25 DIF STOP indicates internal 120K pull up v indicates internal 120K pull down Frequency Select Table Power Groups Pin Number SEL14M 25M FS2 FS1 FS0 OUTPUT(MHz) VDD GND Description (FS3) 34 REFOUT, Digital Inputs, SMBus 0 0 0 0 100.00 DIF Outputs 10,14,19,31,36,40 15,35 0 0 0 1 125.00 N/A 47 IREF 0 0 1 0 133.33 48 47 Analog VDD & GND for PLL Core 0 0 1 1 166.67 0 1 0 0 200.00 0 1 0 1 266.67 0 1 1 0 333.33 0 1 1 1 400.00 1 0 0 0 100.00 1 0 0 1 125.00 1 0 1 0 133.33 1 0 1 1 166.67 1 1 0 0 200.00 1 1 0 1 266.67 1 1 1 0 333.33 1 1 1 1 400.00 IDT Eight Output Differential Frequency Generator for PCIe Gen3 and QPI 1680E04/04/17 2 9FG830