Low Jitter, 11-output MEMS Clock Generator

The Cascade™ SiT95143 is a single-chip MEMS clock generator optimized for the highest level of clock tree integration. This clock-system-on-a-chip (ClkSoC) consolidates multiple clock ICs and oscillators into a single device. Its low noise quad-PLL architecture and programmable output drivers provide up to 10 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 clock generator integrates SiTime’s third-generation MEMS resonator. This integrated MEMS approach eliminates the traditional clock dependency on crystal reference and quartz related issues, and improves system robustness:

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

The SiT95143 is supported by TimeMaster™ software that simplifies 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 SiT95143 is also supported with the SiT6503EB evaluation board.

Single-chip clock generator 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 11
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 PLL, 1 time domain
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
Package Type (mm²) 9x9 mm, 64-pin
Features Redundant clock inputs with manual switching, DCO mode via I2C or SPI, 5 ppt resolution, programmable output delay control
Availability Sampling

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

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

Flexible features for the highest level of clock consolidation

  • 11 outputs, 4 independent PLLs, up to 2.1 GHz output frequency for maximum frequency agility
  • Individually configurable output types and voltage to support a wide range of processors and SOCs
  • Optional 4 inputs to enable flexible input-output frequency translation
  • In-system programmability via I2C or SPI for further SKU reduction

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

  • Clock tree consolidation replacing crystal oscillators (XOs) and buffers
  • 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

SiT6503EB Evaluation Board User Manual

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

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