SIT9507

MEMS Differential Oscillators | SiT9507 Series

Product Introduction

SiT9507 is SITIME's flagship ultra-low jitter differential MEMS oscillator for high-performance network infrastructure. Typical phase jitter: 29 fs RMS (12 kHz–20 MHz) — meeting 112G/224G SerDes and optical module timing demands. Industry's smallest 2.0×1.6 mm differential MEMS package saves 50% PCB space vs quartz. 4th-gen MEMS delivers superior vibration, EMI, and power noise immunity from -40°C to +105°C. Supports LVPECL, LVDS, HCSL, low-power HCSL; 1.8–3.63V; ±20 to ±50 ppm stability; 16 standard frequencies (100–625 MHz). Available through YQM ELECTRONICS (YQM).

Core Advantages

• 29 fs RMS Jitter — Proven in Real Designs: 29 fs is the typical production value, not just a datasheet claim. In 112G/224G SerDes links this translates into wider eye openings, lower BER, and fewer compliance-test failures — margin where high-speed links need it most.
• 625 MHz High-Fundamental — Field-Proven Leader: SITIME is among the very few suppliers shipping volume-verified 625 MHz MEMS differential oscillators. 625 MHz is the mainstream reference frequency of next-gen 1.6T optical modules, with direct headroom for 3.2T iteration and CPO optical engines (see below).
• 4th-Gen MEMS: 20× better shock/vibration resistance than quartz. No activity dips, no micro-jumps.
• Smallest Package: 2.0×1.6 mm — 50% smaller than quartz. Integrated termination resistors.
• Stable Semiconductor Supply: Silicon MEMS process — consistent quality, predictable lead times.

Why 625 MHz: Built for 1.6T → 3.2T → CPO

As optical interconnect moves from 800G to 1.6T, the 625 MHz differential reference clock has become the mainstream frequency point for next-generation optical modules. SiT9507's 625 MHz high-fundamental MEMS architecture skips multiplier-chain complexity, delivering the clean, low-jitter reference that 1.6T DSP retimers demand — while the same platform scales naturally to 3.2T iterations and co-packaged optics (CPO), where jitter budget per channel shrinks even further.

• 1.6T optical modules: 625 MHz reference with 29 fs RMS jitter keeps 224G/lane SerDes eye diagrams wide open.
• 3.2T pre-development: same frequency family, proven headroom for next-gen platforms.
• CPO optical engines: tiny 2.0×1.6 mm footprint + high-temperature stability fit dense co-packaged designs.

Engineer Pain Points → SiT9507 Solutions

Key Features

Applications

FAQ

Q: Is 29 fs the typical or maximum jitter?

A: 29 fs RMS is the typical production value (12 kHz–20 MHz integration), consistently delivered across volume — not a cherry-picked lab number.

Q: Does SiT9507 support 625 MHz for 1.6T optical modules?

A: Yes. 625 MHz is one of the 16 standard frequencies and the platform is already proven in 1.6T-class optical module designs, with headroom for 3.2T and CPO.

Q: Drop-in replacement for differential quartz oscillators?

A: Yes. Standard 2.0×1.6/2.5×2.0/3.2×2.5 mm footprints, standard LVPECL/LVDS/HCSL pinouts — no PCB changes.

Q: Does jitter hold up at high temperature?

A: Yes. The device is rated for -40~+105°C operation; 4th-gen MEMS keeps phase noise stable across the full temperature range, with no activity dips.

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