CDC2351QDB

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The CDC2351QDB is a low-skew clock buffer and driver designed to achieve the noise immunity, signal integrity, and low-skew performance of large-scale high-speed systems. The device is ideally suited for applications that require multiple receives or transmits from a single clock generator, high-performance debug and verification systems, and applications requiring very high-speed clock distribution. This article will discuss the application field and working principle of the CDC2351QDB.

Application Field

CDC2351QDB is a highly integrated clock buffer and driver, intended to be used in a range of applications. Due to its low-skew and high-performance characteristics, this device is well suited for applications that require multiple receive and transmit signals from a single clock source. This includes digital systems operating at high data rates, as well as FPGA-based systems with multiple clock streams. It is also suitable for applications with very high-speed serial links and amplified signals, such as memory and peripheral interfaces.

CDC2351QDB is ideal for use within high-performance debug and verification systems to ensure signal integrity and noise immunity. It can be used in device test systems for dynamically testing and verifying performance of high-speed integrated circuits. Clock distribution in FPGA-based systems and ASIC design and verification processes also benefit from using these devices. Additionally, CDC2351QDB is well suited for applications where precise timing is necessary, such as test and instrumentation systems.

Other applications of these devices include clock synchronization between multiple modules and systems, as well as high-speed networking and parallel computing. Broadband and cellular communication systems, such as CDMA and LTE, also benefit from the CDC2351QDB\'s robust performance.

Working Principle

CDC2351QDBClock Buffers, Drivers are designed with integrated gate drivers and an advanced signal integrity control architecture to ensure a high-speed data transfer rate and high signal integrity. The device works by converting a single input clock signal, typically operating at up to 40MHz, into as many as 16 output clocks. These output clocks operate with nearly identical frequency, phase, and peak-to-peak signal level.

The CDC2351QDB utilizes a low-skew differential design architecture to accurately replicate and distribute the input signal across multiple outputs. This low-skew differential design is critical for signal integrity, assuring that all output signals maintain the same timing relationship with respect to the input signal, ensuring reliable operation and increased data transfer speed.

The CDC2351QDB also has a built-in edge-placement control feature that automatically triggers and terminates up to eight edge-evenly placed output clocks on the rising edge of the differential source clock. This allows for flexible clock management and improved system performance, as fewer output clock edges are needed.

The CDC2351QDB also has systems-friendly clock selection and de-skew control capabilities. This includes an integrated low-skew selector that allows the user to choose between two reference clocks and two external inputs when selecting the system clock source. Additionally, the device supports fully-programmable de-skew for optimum signal integrity, allowing for edge placement to be adjusted up to 3ns.

Finally, the CDC2351QDB also features a special sleep and standby mode, which allows the output signals to be disabled when the device is not in use. This ensures reliable operation in a power-down mode and also extends device life.

Conclusion

The CDC2351QDB is an ideal device for applications that require multiple receive and transmit signals from a single clock source, applications requiring very high-speed clock distribution, and high-performance debug and verification systems. The device is designed to provide low-skew, high-speed signal distribution and enhanced signal integrity, as well as flexible clock control and de-skewing capabilities. Combined, these features make the CDC2351QDB an ideal device for a wide range of clock distribution and signal integrity applications.

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