The SI5319B-C-GM is an any-frequency precision clock multiplier and jitter attenuator from Skyworks Solutions, built for equipment that demands sub-picosecond timing accuracy. It suits engineers designing telecom line cards, networking hardware, and SONET/SDH or OTN systems, where a clean, precisely translated reference clock keeps the entire signal chain stable.
Part of the Si5319 family, this B-grade device accepts an input clock from 2 kHz to 710 MHz and generates a single output up to 808 MHz using Skyworks' third-generation DSPLL technology. It ships in a surface-mount 36-lead 6 x 6 mm QFN package, is Pb-free and RoHS compliant, and integrates its loop filter on-chip to remove the noise risk of discrete designs. Here is what makes it worth specifying.
Key Features of the SI5319B-C-GM
Any-frequency clock multiplication and jitter attenuation
The device combines frequency synthesis and jitter cleaning in a single IC, translating a 2 kHz to 710 MHz input into an output up to 808 MHz. This gives designers virtually any M/N frequency translation across the operating range from one part.
Sub-picosecond jitter performance
It delivers 0.3 ps RMS phase jitter, meeting the timing budgets of high-speed serial links and optical transport. Cleaner edges reduce bit errors downstream and protect margin across the rest of the board.
Fully integrated on-chip loop filter
The loop filter sits inside the device, so there are no external filter components to source, place, or shield. That removes a common noise-coupling risk and simplifies the surrounding PCB layout.
Digitally programmable loop bandwidth
Jitter attenuation bandwidth is set digitally rather than by discrete components, letting engineers tune performance for the specific application. Configuration runs over a standard I2C or SPI interface.
Surface-mount 36-lead QFN package
The 6 x 6 mm 36-lead QFN footprint is compact and reflow-friendly for automated assembly, and its exposed pad supports thermal dissipation on dense line-card and infrastructure boards. The part is rated for the industrial -40 to 85 degrees C range.
Pb-free and RoHS compliant
The SI5319B-C-GM is Pb-free and RoHS compliant, so it drops directly into environmentally compliant manufacturing and reporting.
Applications of the SI5319B-C-GM
This part is typically used in:
- SONET/SDH transport equipment
- Optical transport network (OTN) systems
- ITU G.709 FEC line cards
- Ethernet and Gigabit Ethernet line cards
- Telecom infrastructure and switching
- Wireless base station timing
- Broadcast video and network synchronisation
- Test and measurement instrumentation
- Data centre networking hardware
- Any-frequency clock generation and translation