CY7B9910-7SXCT

Clock Generators, PLLs, Frequency Synthesizers Overview

The CY7B9910-7SXCT is a low skew clock buffer manufactured by Infineon Technologies (formerly Cypress Semiconductor). It features an integrated PLL for zero-delay operation and provides eight differential outputs. The device operates within a frequency range of 15 to 80 MHz, depending on the FS pin configuration. Key electrical parameters include a typical output skew of 0.3 ns and a maximum of 0.75 ns. Jitter specifications are limited to 200 ps peak-to-peak and 25 ps RMS. The component utilizes a 24-pin SOIC package and supports commercial temperature ranges.

Clock Generators, PLLs, Frequency Synthesizers Feature Summary

• Integrated PLL enables zero-delay synchronization between input reference and feedback signals.
• Provides eight individual drivers capable of terminating transmission lines with impedances as low as 50Ω.
• Maintains specified output skews and full-swing logic levels across all outputs.

Clock Generators, PLLs, Frequency Synthesizers Applications

• Low skew system clock distribution in high-performance computer systems.
• Board-to-board clock distribution trees using cascaded buffers.
• Timing optimization for multiple loads requiring synchronized clock signals.

Clock Generators, PLLs, Frequency Synthesizers Procurement Notes

Verify the specific suffix 'SXCT' corresponds to the tape and reel packaging variant listed in the official ordering information. Confirm that the manufacturer designation aligns with Infineon Technologies following their acquisition of Cypress Semiconductor assets. Ensure the component meets the required commercial operating temperature range before integration into the design.

Clock Generators, PLLs, Frequency Synthesizers Selection Notes

Select this model when a low skew clock buffer with integrated PLL is required for frequencies up to 80 MHz. The -7 accuracy grade offers a typical skew of 0.3 ns, suitable for applications tolerating slightly higher skew than the -2 or -5 grades. Consider the 24-pin SOIC package constraints and ensure the PCB layout accommodates the necessary termination resistors for the 50Ω transmission lines.

Clock Generators, PLLs, Frequency Synthesizers Part Context

This component belongs to the CY7B9910/CY7B9920 family of low skew clock buffers. The CY7B9910 variant specifically delivers TTL logic levels, whereas the CY7B9920 provides CMOS levels. Both share identical functional block diagrams and PLL capabilities, differing primarily in output drive characteristics and voltage thresholds.

Clock Generators, PLLs, Frequency Synthesizers Replacement Considerations

Direct substitutes within the same family include CY7B9910-2SXCT and CY7B9910-5SXCT, which offer tighter skew specifications of 0.1 ns and 0.25 ns respectively. These alternatives maintain the same package and pinout but may require adjustments to timing budgets due to improved performance metrics.

Clock Generators, PLLs, Frequency Synthesizers FAQ

What is the function of the TEST input pin?

The TEST input is a three-level input used for testing purposes. In normal operation, it is connected to ground. Forcing it to MID or HIGH disconnects the internal PLL, allowing the REF input to directly control all outputs while maintaining relative output-to-output functions.

How is the operating frequency range determined?

The operating frequency range is selected via the FS (Frequency Select) pin. Setting FS to LOW allows 15-30 MHz, MID allows 25-50 MHz, and HIGH allows 40-80 MHz operation.

Can multiple CY7B9910 devices be cascaded?

Yes, they can be connected in series to construct a board-to-board clock distribution tree. However, the datasheet advises against connecting more than two clock buffers in series due to jitter accumulation caused by non-ideal PLL filter characteristics.