SiTime, Silicon MEMS Oscillators and Clock Generators

SiT8256: LVMCOS Oscillator with 0.3 ps Phase Jitter for 10GbE

E-mail Print

The SiT8256 is a best-in-class 0.3 ps phase jitter, ultra performance oscillator for 10GbE applications. This LVCMOS oscillator supports standard 156.25MHz 10 GbE frequency and 4 upshifted frequencies (+25PPM, +50PPM, +75PPM, etc.) for buffer management and reduction of packet loss. Unlike quartz or SAW oscillators, the SiT8256 is available in any combination of voltage (1.8 to 3.3V), frequency stability (±10 to ±50 PPM) and package (2525, 3225, 5032, 7050) options. The SiT8256 is 100% compatible with legacy quartz and replaces these devices without any design changes.



Frequency Range (MHz) 156.25, 15.253906, 156.2578, 156.257812, 156.261718
Frequency Stability (PPM) ±10, ±20, ±25, ±50
RMS Integrated Phase Jitter (ps)
SoftEdgeTM  Rise/Fall Time (ns)
1 to 4
Temp Range (°C) -20 to +70, -40 to +85
Supply Voltage (V) 1.8, 2.5 - 3.3 (continuous)
Package LxWxH (mm) 2.5x2.0x0.75, 3.2x2.5x0.75, 5.0x3.2x0.75, 7.0x5.0x0.9
Status Production
  • 10 GbE
  • XUAI

Features Benefits
  • 0.3 ps integrated RMS phase jitter
  • Excellent jitter margin for the most stringent applications such as 10 Gb Ethernet
  • 156.25 MHz
  • 156.253906 MHz
  • 156.2579800 MHz
  • 156.257812 MHz
  • 156.261718 MHz
  • Buffer management prevents overflow at the receiver and reduces packet loss
  • Excellent frequency stability, as low as ±10 PPM
  • Better timing margin that enhances system stability and robustness
  • Extensive programmability
    • Supply voltage of 1.8V, 2.5V to 3.3V
    • Frequency stability from ±10PPM to ±50PPM
  • Customized specifications for optimal system performance
  • Easy availability of any device specification within the operating range
  • Configurable drive strength using SoftEdge technology
  • Slower rise/fall time that reduce system EMI
  • Saves cost by driving multiple loads and eliminates external buffers
  • Four industry standard packages
  • 100% drop in replacement for quartz oscillator, SAW and overtone oscillators without any design changes



10. Contact SiTime for custom drive strength to drive higher or multiple load, or SoftEdge™ option for EMI reduction.



1.8V LVCMOS IBIS iconSiT8256_1v8v
2.5V LVCMOS IBIS iconSiT8256_2v5v
2.8V LVCMOS IBIS iconSiT8256_2v8v
3.3V LVCMOS IBIS icon SiT8256_3v3v