SmartNICs (smart network interface cards) are an essential piece of today’s data center infrastructure, offloading the workload of the host processor and enabling expanded services. Reference clocks are a critical component in SmartNICs. These clocks must be resilient under airflow, heat, and vibration. SiTime MEMS timing solutions are built to reliably operate in the tight, hot environments of BBUs and DUs, while consuming less space and power.

SiTime differential oscillators offer low jitter and best-in-class PSNR to improve signal integrity. When IEEE 1588 clock recovery is needed, SiTime Elite Platform® Super-TCXOs® for Data Center Infrastructure are ideal – offering OCXO-grade frequency slope in a TCXO form factor that is small enough to fit on the back of a card.

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SiTime MEMS Timing Benefits for Data Center Infrastructure Applications

Complete MEMS clock tree

Precision MEMS TCXO

Low jitter differential MEMS XO

More robust in real-world conditions

4x better dF/dT for accurate IEEE 1588

Resistant to airflow and heat

Immunity to power supply noise

Thin profile, easy to use

No cover or shielding

≤1 mm thin that fits back of a card

IEEE1588 Enabled, 10/40/100 GbE NIC

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10/40/100 GbE NIC

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MEMS Timing Solutions for SmartNICs

MEMS Timing Solutions Function Frequency Key Features
SiT5907 Super-TCXO IEEE1588 and high-speed SERDES reference clock 20 MHz ±20 ppb up to 70°C, operable to 105°C
SiT535x Super-TCXO 1 to 220 MHz ±100 ppb, ±1 ppb/°C 105°C

SiT9501 Differential XO

High-speed SERDES reference clock 25 to 644.53125 MHz

70 fs jitter for Ethernet, 105°C

SiT9375 Differential XO 25 to 644.53125 MHz  

200 fs jitter for Ethernet, 105°C

MEMS Timing Outperforms Quartz

Better Stability

Better Frequency Slope

Image: MEMS vs. Quartz - Better Stability Graphs


Image: MEMS vs. Quartz graphs - Better Frequency Slope graphs


Better Vibration Resistance

Better Aging

Image: MEMS vs. Quartz - Better Vibration Resistance graphs


Image: MEMS vs. Quartz - Better Aging graphs


Better Allan Deviation

Better PSNR (Power Supply Noise Rejection)

Image: MEMS vs. Quartz - Better Allan Deviation graphs


Image: MEMS vs. Quartz - Better PSNR (Power Supply Noise Rejection) graphs


Watch Video: SiTime MEMS Timing Solutions for SmartNICs

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