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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 LVDS output pair
  • Crystal oscillator interface designed for 18pF, parallel resonant crystal (23.2MHz – 30MHz)
  • Output frequency ranges: 116MHz – 150MHz and 580MHz – 750MHz
  • VCO range: 580MHz – 750MHz
  • RMS phase jitter at 125MHz, using a 25MHz crystal (1.875MHz – 20MHz): 0.46ps (typical)
  • Full 3.3V or 2.5V output supply modes
  • 0°C to 70°C ambient operating temperature
  • Available in a lead-free (RoHS 6) package

Description

The 844251-15 is an Ethernet Clock Generator and a member of the HiPerClocks™ family of high-performance devices. The 844251-15 uses an 18pF parallel resonant crystal over the range of 23.2MHz - 30MHz. For Ethernet applications, a 25MHz crystal is used. The device has excellent <1ps phase jitter performance, over the 1.875MHz - 20MHz integration range. The 844251-15 is packaged in a small 8-pin TSSOP, making it ideal for use in systems with limited board space.

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