The new Si5350/51 octal clock generators with on-chip voltage-controlled crystal oscillators (VCXOs) replace traditional multi-component phase-locked loop (PLL) solutions with a single clock IC that delivers twice the frequency flexibility, 70 percent lower jitter and 30 percent lower power than competing timing products. The Si5350/51 clocks are optimized for cost-sensitive consumer electronics products such as DVRs, HDTVs, set-top boxes and gaming systems as well as printers, projectors, video conferencing, blade servers, single-board computers, RAID systems, femtocells and telecom customer premises equipment.

The Si5350/51 clock generators leverage Silicon Labs’ patented MultiSynth technology to provide superior frequency flexibility, lower jitter, lower power and smaller footprint than any three-PLL or four-PLL clock generator on the market today. Unlike traditional clock generators that require a separate PLL to synthesize each non-integer related output frequency, the Si5350/51 devices synthesize a unique frequency on each of their eight output clocks. By integrating clock synthesis in the clock device’s output divider stage rather than its PLL, the Si5350/51 provides the equivalent clock synthesis capability of eight PLLs while dramatically reducing board space and power consumption.

The Si5350/51 generates all system clocks (audio, video, interface and SoC) and can synthesize any combination of eight unique, non-integer-related frequencies up to 133 MHz with 0 ppm frequency error. The Si5350/51 can also simultaneously generate free-running clocks from a crystal input as well as clocks synchronized to a reference clock or analog control voltage input, allowing multiple board-level timing domains to be clocked from a single device.

The device provides:

• Frequency synthesis capability of 8 PLLs
• Significantly lower jitter, lower power and smaller size
• Supports any frequency from 8 kHz to 133 MHz with 0 ppm frequency synthesis error
• Can replace both fixed-frequency clock ICs and crystal oscillators (XO)

The Si5350/51 features an integrated VCXO which eliminates the need for custom, pullable crystals. The Si5350/51 are optimized for low jitter clock generation in cost-sensitive consumer, enterprise and communications applications.

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• Generates any frequency on any output
• 8 kHz to 133 MHz
• Exact clock synthesis: 0 ppm error
• Similar frequency flexibility as 8 independent PLLs
• Accepts crystal, clock or analog control voltage input
• <100 ps period jitter for any configuration
• Glitchless switching between output frequencies
• Integrated VCXO eliminates need for pullable crystal
• Si5350 (pin) and Si5351 (I2C) versions
• User-definable control pins:
• Frequency select, output enable, spread spectrum enable, powerdown
• Excellent PSRR: no discrete filter components required
• Spread spectrum clock generation
• -0.5 to -2.5% down, ±0.1 to ±1.5% center
• Factory and field-programmable versions
• Two week sample lead time for any custom clock
• Small size: 4 mm x 4 mm 20-QFN, 24-QSOP and 10-MSOP
• Industrial temperature range: -40 to +85 °C

• Consumer
• HDTV
• DVR/Blu-Ray
• A/V Receivers
• HD cameras
• Enterprise
• Tower/rack/blade servers
• Storage
• Video Encoders
• Video Transport
• Video Conferencing
• Projectors
• Printers
• Communications
• Gateway
• Femtocell
• Networking