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871S1022 - Block Diagram
871S1022 - Pinout


Differential-to-0.7V Differential PCI Express® Jitter Attenuator

IDT's PLL-based clock generators offer sub-picosecond jitter, low-skew clock outputs, and edge rates that meet the ever-growing demands of today's networking solutions. The 871S1022 is a PLL-based clock generator specifically designed for PCI Express® Clock Generation applications. The device generates 100MHz, 125MHz, 250MHz or 500MHz from either a 25MHz fundamental mode crystal or a 100MHz recovered clock. The 871S1022 has two modes of operation: (1) high frequency jitter attenuator and (2) high performance clock synthesizer mode. When in jitter attenuator mode, the 871S1022 is able to both suppress high frequency noise components and function as a frequency translator. Designed to receive a jittery and noisy clock from an external source, the 871S1022 uses FemtoClock® technology to clean up the incoming clock and translate the frequency to one of the four common PCI Express® frequencies. When in synthesizer mode, the device is able to generate high performance SSC and non-SSC clocks from a low cost external, 25MHz, fundamental mode crystal. The 871S1022 uses FemtoClock® technology to generate low noise clock outputs capable of providing the seed frequencies for the common PCI Express® link rates.


  • Four 0.7V differential output pairs
  • One differential clock input pair
  • CLK, nCLK pair can accept the following differential input levels: LVPECL, LVDS, LVHSTLHCSL
  • Crystal oscillator interface designed for 25MHz, 18pF parallel resonant crystal
  • RMS phase jitter @ 100MHz, using a 25MHz crystal (12kHz - 20MHz): 0.608ps (typical)
  • High frequency jitter attenuator mode has high PLL bandwidth which allows for better input tracking
  • Supports PCI Express® Spread-Spectrum Clocking
  • PCI Express® Gen 1, 2 and 3 jitter compliant
  • 3.3V operating supply voltage
  • 0°C to 70°C ambient operating temperature
  • Available in lead-free (RoHS 6) package

Product Options

Orderable Part IDPart StatusPkg. CodePkg. TypeLead Count (#)Temp. GradePb (Lead) FreeCarrier TypeSample & Buy
871S1022EKLFActiveNLG32P3VFQFPN32CYesTrayCheck Availability
871S1022EKLFTActiveNLG32P3VFQFPN32CYesReelCheck Availability


Technical Documentation

Title Type Format File Size Datesort icon
Datasheets & Errata
871S1022 Datasheet Datasheet PDF 1001 KB May 22, 2012
PCN# : A1511-01(R1) Add SPEL India as Alternate Assembly Location Product Change Notice PDF 596 KB Jan 28, 2016
PCN# : A1511-01 Add SPEL India as Alternate Assembly Location Product Change Notice PDF 544 KB Nov 13, 2015

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