CY7B9910-5SI

Clock Generators, PLLs, Frequency Synthesizers Overview

The CY7B9910-5SI is a low skew clock buffer manufactured by Infineon Technologies (formerly Cypress Semiconductor). It features an integrated Phase-Locked Loop (PLL) providing zero input-to-output delay and eight individual outputs. The device operates within a frequency range of 15 MHz to 80 MHz, selected via the FS pin. It supports TTL logic levels for the CY7B9910 variant and CMOS levels for the CY7B9920 variant. The component is housed in a 24-pin SOIC package and is rated for industrial operating temperatures ranging from -40°C to +85°C.

Clock Generators, PLLs, Frequency Synthesizers Feature Summary

• Integrated PLL enables zero delay synchronization between reference input and feedback loop.
• Eight outputs provide low skew distribution suitable for high-performance computer systems.
• Capable of driving terminated transmission lines with impedances as low as 50 ohms.

Clock Generators, PLLs, Frequency Synthesizers Applications

• System clock distribution for Pentium-based processors
• Low-skew clock tree construction on printed circuit boards
• Board-to-board clock distribution using cascaded buffers

Clock Generators, PLLs, Frequency Synthesizers Procurement Notes

Verify the specific suffix 'SI' confirms the Industrial temperature grade (-40°C to +85°C) and TTL output levels. Confirm the accuracy class corresponds to the 500 ps skew specification. Ensure the 24-lead SOIC package type matches the design footprint requirements before finalizing procurement.

Clock Generators, PLLs, Frequency Synthesizers Selection Notes

Select this component when zero-delay clock alignment is required for multiple loads. The -5SI suffix indicates the industrial temperature range and 500 ps typical skew accuracy. Compare against the -2SC or -7SC variants if commercial temperature ranges or different skew accuracies are acceptable for the application environment.

Clock Generators, PLLs, Frequency Synthesizers Part Context

This part belongs to the CY7B9910/CY7B9920 family of low skew clock buffers. The CY7B9910 provides TTL outputs while the CY7B9920 provides CMOS outputs. Both share identical internal PLL architecture and pin configurations, differing primarily in output drive characteristics and voltage thresholds.

Clock Generators, PLLs, Frequency Synthesizers Replacement Considerations

Direct replacements include other CY7B9910-5SI units or CY7B9920-5SI if CMOS outputs are acceptable. Verify that any substitute maintains the 24-lead SOIC package and industrial temperature rating.

Clock Generators, PLLs, Frequency Synthesizers FAQ

What determines the operating frequency range of the CY7B9910-5SI?

The operating frequency range (15-80 MHz) is determined by the state of the FS (Frequency Select) pin, which configures the Voltage-Controlled Oscillator (VCO).

How is the zero delay feature achieved?

Zero delay is achieved by connecting the Feedback (FB) input to one of the outputs, allowing the internal PLL to track the incoming REF signal and align the output phase accordingly.

Can multiple CY7B9910 devices be cascaded?

Yes, they can be connected in series for board-to-board distribution, but it is not recommended to connect more than two buffers in series due to accumulated low-frequency jitter.