Si5371/5372 and Si5342H/5344H Coherent Optical Clocks

Si5371/5372 and Si5342H/5344H optical clocks address the needs of coherent optical communications applications. Each low jitter output can be configured as a high speed output (up to 2.75 GHz) or a general clock output (up to 717.5 MHz). The coherent optical clocks leverage 4th generation DSPLL® technology to clean recovered clocks, DCO mode for coherent DSP control via a fast SPI interface and integrated MultiSynth fractional synthesis to support eye-diagram monitors, FEC and MUX/DEMUX clock requirements. Such single-chip integration enables the stringent performance, form-factor and power requirements demanded in 100G/200G/400G line cards and modules.

Output frequency
0.0001 - 2750 MHz
Package size
7x7 mm

Coherent Optical Clock Common Specs

  • Up to 2.75 GHz outputs replace VCSOs and synthesizers
    • Si5372/5371
      • Grade A - external reference (same as Si5344H/42H)
      • Grade J - new integrated reference
        • Better acoustic emissions performance
        • Smaller board area
    • Ultra-low phase jitter:
      • High Speed Integer Mode: ≤ 50 fs-rms typ (1 MHz - 40 MHz)
      • Fractional MultiSynth Mode: ≤ 90 fs-rms typ (12 kHz - 20 MHz)
  • Digitally selectable loop bandwidth for cleaning recovered clocks
  • Digitally controlled oscillator (DCO) with fast SPI interface
  • MultiSynth fractional synthesis for any-frequency clock support
  • Single-chip solution in a small 7x7 mm, QFN44 package or LGA44 (Si5371J or 72J)
  • Si5372/5371: 4-inputs, Si5344H/5342H: 2-inputsSi5372/5344H: 4-outputs,
  • Si5371/5342H: 2-outputs


Find the Right Coherent Optical Clock Select Columns
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Part Number Input Frequency Output Frequency Output Format(s) Description Number of Inputs Number of Outputs Phase Jitter (RMS) VDD (V) VDDO (V) Package Type Package Size (mm) Output Bin Synchronous Ethernet/1588 Intel x86 Clocks Output Frequency Max

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