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SM840051 Clock Synthesizer


Micrel's SM840051 clock synthesizer designed for Ethernet standards


SM840051 Clock SynthesizersMicrel's SM840051 clock synthesizer was designed for Ethernet standards. The SM840051 is optimized for 77.76, 78.125, 80.56, 155.52, 156.25, and 161.13MHz using a crystal at 1/8th the output frequency. The SM840051 includes a unique power reduction methodology, along with a patented RotaryWave™ architecture, that provides a stable clock with very low noise for optimized performance. This yields an overall improved bit error rate (BER) and improved waveform integrity.

Power supplies of either 3.3V or 2.5V are supported with superior jitter and phase noise performance. An FSEL pin supports 4x or 8x multiplication of the crystal frequency. The SM840051 provides ultra-low jitter and consumes low power.

Features
  • Generates a single LVCMOS/LVTTL output
  • RMS phase jitter at 156.25MHz (1.875MHz-20MHz): 58fs (typical)
  • Integrated loop filter components
  • Operates with either a 3.3V or 2.5V supply
  • Fundamental parallel resonant crystal
  • Crystal frequencies: 20.141601MHz,19.53125MHz, and 19.44MHz
  • Industrial temperature range: -40°C to +75°C
  • Power consumption is <77mA @ 3.3 V

Digi-Key P/N Manufacturer P/N Description  
576-3622-5-ND SM840051KA IC CLK SYNTHESIZER 10G 8TSSOP High-Capacitance MLCC Datasheet