Low Jitter, 8-output MEMS Network Synchronizer

The Cascade™ SiT95147 is a single-chip MEMS network synchronizer optimized for IEEE 1588 and time synchronization applications. The device comes with 4 independent time domains, 1 mHz to 4 kHz programmable loop bandwidth, low wander mode and fastest hitless switching.  Its low noise quad-PLL architecture and programmable output drivers provide up to 8 differential or 20 LVCMOS low jitter clock outputs. It supports 4 additional clock inputs with Frac-N dividers, enabling virtually any input to output frequency translation configurations from 8 kHz to 2.1 GHz.  

This network synchronizer integrates SiTime’s third-generation MEMS resonator. This integrated MEMS approach eliminates the dependency on a crystal reference, along with all quartz related issues, offering a true clock-system-on-a-chip that improves system robustness:

  • Always-accurate clock synthesis by eliminating crystal capacitive mismatch
  • Always-reliable startup even at cold temperature and other harsh environmental conditions
  • No jitter degradation due to noise coupling onto a crystal interface
  • No activity dips/frequency jumps inherent to quartz
  • 10x more resistant to vibration and board bending

The SiT95147 is supported by TimeMaster™ software application to simplify clock tree design. The device can also be shipped with a user-specified, factory pre-programmed default startup configuration. The device configuration can be re-programmed twice using two banks of one-time-programmable (OTP) memory during manufacturing or configured in-system via I2C/SPI for additional BOM flexibility. The SiT95147 is also supported with the SiT6502EB evaluation board.

Single-chip network synchronizer consolidates MEMS resonator, multiple clock ICs and oscillators into a single 9 x 9 mm 64-pin device
Number of Inputs 4
Number of Outputs 8
Input Frequency Range 8 kHz to 2.1 GHz (differential), 8 kHz to 250 MHz (LVCMOS)
Output Frequency Range 8 kHz to 2.1 GHz (differential), 8 kHz to 250 MHz (LVCMOS), 1 PPS (one output only)
Output Type LVPECL, CML, HCSL, LVDS, LVCMOS
Number of PLL/Clock Domains 4 PLLs, 4 time domains
Programmable Loop Bandwidth 1 mHz to 4 kHz
Operating Temperature Range (°C) -40 to +85
Phase Jitter (rms) 120 fs
Voltage Supply (V) 1.8, 2.5, 3.3
Operating Mode Free running, synchronized, holdover
Package Type (mm²) 9x9 mm, 64-pin
Features Low wander mode, hitless switching, zero-delay buffer mode, DCO with 50-ppt resolution, programmable output delay control
Availability Sampling

Clock-system-on-a-chip with integrated MEMS, simplifies designs

  • No crystal capacity matching, always-accurate frequency synthesis
  • No noise coupling onto crystal circuits, guaranteed jitter
  • Resistant to vibration and board bending, anywhere PCB replacement

Flexible features for best IEEE 1588, syncE, and timing synchronization performance

  • 4 inputs, 8 outputs, 4 PLLs, up to 2.1 GHz output frequency for flexible frequency translation
  • Individually configurable output types and voltage to support a wide range of processor and SOCs
  • Programmable loop bandwidth (1 mHz to 4 kHz)
  • Low wander mode using precision TCXO for clock recovery and OCXO for holdover
  • Fastest hitless switching (sub 50 ps phase build-out)

35% space saving ideal for high density designs

  • 9 x 9 mm package, no external XTAL/oscillator required

Semiconductor level quality and reliability, eliminates quartz related issues associated with traditional clocks

  • IEEE 1588 Precision Time Protocol (PTP)
  • Synchronous Ethernet (G.8262, options 1 and 2)
  • JESD204B support
  • Low jitter clock frequency translation and generation
  • 10G/100G/400G Ethernet clocking
  • Optical transport network (OTN) clocking for framers, mappers, and processors
  • FPGA, processor, and memory clocking
  • Storage, servers and datacenters
  • Test and measurement
  • Broadcast video

SiT6502EB Evaluation Board User Manual

TimeMaster for Clocks Software -- Simplifes clock tree design (Contact SiTime)

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