SiT95148

The Cascade™ SiT95148 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 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 network synchronizer integrates SiTime’s third-generation ApexMEMS™ 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 SiT95148 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.