CY7B991V-2JXCT

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CY7B991V-2JXCT is a product of Cypress Semiconductor, specialized in the product suites of Clock/Timing family, more specifically in Clock Buffers, Drivers. It is a 3.3V low-power dual-mode clock buffer, which helps to generate a low-jitter, low-skew multi-phase clock from LVCMOS input or spread spectrum clock input. This product can be beneficial in reducing EMI, but the resulting clock output signals may not be entirely in phase with each other.

Applications

The CY7B991V-2JXCT is suitable for a variety of applications in end markets such as networking, storage, and consumer electronics. Common use for the product includes:

• Gigabit Ethernet
• Specialized interface control (such as xAUI, SFI, and XGMII)
• Motherboard high frequency application
• Clock generation
• High Speed Serial Port Interface (such as SFI and XFI)

Features

Other than the mentioned applications, the CY7B991V-2JXCT has several features which are beneficial in terms of power consumption, immunity to noise and EMI, flexibility, etc.:

• Low Power: With the new architecture, CY7B991V-2JXCT can operate with a lower total power consumption
• Low Jitter and Low Skew: Achieving precise time synchronization with the target system
• Spread Spectrum Clocking (SSC) Function: To reduce EMI generation
• Output Enable/Disable: On chip supply sequencing allows for safe power up and shut down
• Programmable Multi-Phase Clock Generation: Increased flexibility for other motherboard applications
• Temperature Monitoring: Through on-chip temperature monitoring and on-chip programmable thermal alert

Working Principle

The CY7B991V-2JXCT is designed to be a dual-mode clock buffer, with the ability to accept both LVCMOS clocks and spread spectrum clock (SSC) inputs. This allows for a number of different clock outputs to be generated, depending on the application.

The clock input can be generated internally as well, through programmable multi-phase clock generation. It also includes output enable/disable to put the device into a low power-consumption state. Spread Spectrum Clocking is included to reduce EMI. Lastly, there is a temperature monitor feature, to monitor the temperature of the device and provide thermal alerts if needed.

For the LVCMOS input, the clock buffer will generate multiple output clock with the same frequency and phase as the input clock. The output clocks may be all in phase with the input depending on the setup; otherwise, the output clocks may not be in phase with each other. For the SSC input, the clock buffer acts as an SSC generator and provides multiple spread spectrum clock outputs.

Conclusion

CY7B991V-2JXCT is an ideal solution for a variety of end markets, such as networking, storage, and consumer electronics. With the combination of low power consumption, low jitter and low skew output, spread spectrum feature and programmable multi-phase clock generation, the CY7B991V-2JXCT is highly suitable for a variety of applications. It is also suitable for a variety of low power applications in motherboards, as the output enable/disable feature allows for power savings. The temperature monitoring function also enhances the device security as well.

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