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Renesas Electronics Corporation

Renesas’ Timing product portfolio has been acquired by SiTime.

Datasheets, documentation, and sample orders remain available on Renesas.com through late 2026. For new designs, purchasing, support, and product inquiries, visit SiTime.com or send an email to [email protected]. Full transition to SiTime is expected by late 2026.

Features

  • One differential 3.3V LVPECL output
  • Crystal oscillator interface designed for 18pF parallel resonant crystal
  • Crystal input frequency range: 19.33MHz – 30MHz
  • Output frequency range: 145MHz – 187.5MHz
  • VCO range: 580MHz – 750MHz
  • RMS phase jitter @ 156.25MHz, (1.875MHz – 20MHz): 0.39ps (typical)
  • Full 3.3V supply mode
  • -40°C to 85°C ambient operating temperature
  • Industrial temperature information available upon request
  • Available in lead-free (RoHS 6) package

Description

The 843251I-04 is a 10Gb/12Gb Ethernet clock generator that can synthesize 10 Gigabit Ethernet and 12 Gigabit Ethernet with a 25MHz crystal. It can also generate SATA and 10Gb Fibre Channel reference clock frequencies with the appropriate choice of crystals. The 843251I-04 has excellent phase jitter performance and is packaged in a small 8-pin TSSOP, making it ideal for use in systems with limited board space.

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