VS-500-LFF-GNN-622M080000 Microchip Crystal or Oscillator (Other) In Stock
Microchip VS-500-LFF-GNN-622M080000 is a 622.8 MHz VCSO oscillator with PECL output, 3.3V supply, and ±50 ppm frequency stability for high-speed communication clock applications. Available from stock worldwide.
- Manufacturer
- Microchip
- Package
- Other
- Pin Count
- 6
- Lifecycle
- ACTIVE
- Category
- Crystal or Oscillator
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
What are the key features of VS-500-LFF-GNN-622M080000?
- 622.8 MHz VCSO output with PECL differential signaling for low-jitter high-speed clock distribution in telecom systems
- 3.3V supply with ±50 ppm APR frequency accuracy ensuring stable clocking over temperature and aging
- Voltage-controlled oscillator functionality enabling fine frequency trimming in PLL and SONET/SDH reference clock circuits
What is VS-500-LFF-GNN-622M080000 used for?
The VS-500-LFF-GNN-622M080000 is designed for SONET/SDH OC-12 line card clocking, Gigabit Ethernet PHY reference oscillators, and optical transceiver modules requiring a stable 622.8 MHz PECL clock source. Its voltage-control input supports integration into PLL-based clock synthesis and jitter attenuation circuits in telecom switching equipment, test instrumentation, and high-speed serial communication systems operating at 3.3V.
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
Where can I find the VS-500-LFF-GNN-622M080000 datasheet?
VS-500-LFF-GNN-622M080000 Datasheet DownloadOfficial datasheet from Microchip
What are equivalent replacements for VS-500-LFF-GNN-622M080000?
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
What output frequency and signaling standard does VS-500-LFF-GNN-622M080000 provide for SONET clock applications?
The VS-500-LFF-GNN-622M080000 outputs a 622.8 MHz clock using PECL (Positive Emitter-Coupled Logic) differential signaling. This frequency corresponds exactly to the OC-12 SONET line rate, making it a direct reference clock source for OC-12 framer ICs and jitter attenuators in optical networking line cards operating at 622 Mbit/s transmission rates.
How does the ±50 ppm frequency accuracy of VS-500-LFF-GNN-622M080000 affect timing budget in a SONET/SDH system?
With ±50 ppm frequency accuracy over the full operating temperature range, the VS-500-LFF-GNN-622M080000 contributes a worst-case frequency offset of ±31.14 kHz at 622.8 MHz to the system clock budget. For SONET/SDH applications requiring Stratum 4E or better holdover, this initial frequency accuracy must be combined with a PLL to reduce long-term wander below the ITU-T G.813 mask, which the VCSO's voltage-control input facilitates directly.
What supply voltage does VS-500-LFF-GNN-622M080000 require, and what load termination do PECL outputs need?
The VS-500-LFF-GNN-622M080000 operates from a 3.3V supply rail. PECL differential outputs require DC termination resistors to VCC-2V (approximately 1.3V referenced to the 3.3V rail) at each output line, typically implemented with 50-ohm resistors to a VCC-2V node or equivalent AC-coupled termination, ensuring the PECL swing levels and output impedance match the receiving device's input requirements for reliable 622.8 MHz signal integrity.
What design advantage does using a VCSO like VS-500-LFF-GNN-622M080000 offer over a fixed-frequency crystal oscillator in a PLL loop?
A VCSO provides a voltage-tunable frequency control input that a PLL feedback loop can drive to lock the 622.8 MHz output to an external reference, enabling both frequency synthesis accuracy and low phase noise. A fixed-frequency crystal oscillator lacks this tuning input, making it unable to correct for frequency offset within a PLL, while the VCSO's ±50 ppm initial accuracy reduces the PLL pull-in range required and shortens lock acquisition time in SONET jitter attenuator designs.
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