Part Number: NB3L553MNR4G

Manufacturer: Onsemi

Description: IC CLK BUFFER 1:4 200MHZ 8DFN

Shipped from: Shenzhen/HK Warehouse

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NB3L553MNR4G Introduction

The NB3L553MNR4G is a high-performance, flexible, low-skew 1-to-4 clock fanout buffer that was made for clock sharing. This detailed guide is meant to help you learn everything you need to know about the NB3L553MNR4G, including its features, benefits, best design practices, layout suggestions, and how to reduce skew within and between devices.

Understanding the NB3L553MNR4G

The NB3L553MNR4G is a special 1-to-4 clock fanout buffer with low skew that is very important in clock distribution applications. Clock distribution is the process of sending a single clock signal to multiple parts of a system. This keeps the timing and function of all the parts in sync. The NB3L553MNR4G is made to send clock signals to up to four devices quickly. This makes it an important part of many high-speed digital systems, such as microprocessors, FPGAs, and network switches.

NB3L553MNR4G Features and Specifications

  • Low Skew Performance: The NB3L553MNR4G is guaranteed to have a low output-to-output skew, which is the smallest change in timing between the clock signals that are sent to different places. This makes sure that all devices get the clock information at the same time. This keeps everything working in sync and keeps timing mistakes to a minimum.
  • 1-to-4 Fanout Capability: The NB3L553MNR4G has the ability to copy a single clock input signal to four different clock outputs. This is called the “fanout” capability. This lets a single clock signal be sent to multiple devices, getting rid of the need for separate time sources and making system design easier.
  • High-Speed Operation: The NB3L553MNR4G can handle high-frequency clock signals, which makes it a good choice for demanding apps that need to be synchronized with exact timing. Depending on the type of gadget, it can handle clock frequencies from several hundred megahertz to several gigahertz.
  • Low Input Jitter: The input circuitry of the buffer is made to reduce input jitter, which is the difference in timing of the clock signal at the input of the buffer. By reducing input jitter, the NB3L553MNR4G makes sure that the distributed clock output is clean and stable. This improves the overall performance of the system.
  • Wide Operating Voltage Range: The NB3L553MNR4G works with a wide range of input and output voltage levels, so it can meet the needs of different systems and voltage standards. It works with common voltage standards like LVCMOS, LVTTL, and LVPECL, which makes it easy to use in a variety of systems.

Benefits of the NB3L553MNR4G

● Reliable Clock Distribution

The NB3L553MNR4G makes sure that all of the clock messages in a system are accurate and in sync across all of the devices. By turning a single clock input into four separate clock outputs, it gets rid of the need for four separate clock sources. This makes system design easier and reduces the chance that the clocks won’t match or the signal will get worse. This reliability is important for keeping the system’s integrity, stopping data corruption, and making sure that the different parts work well together.

● Reduced Signal Delay

The NB3L553MNR4G’s low skew performance keeps signal delays to a minimum and makes sure that the distributed clock signals travel at the same speed and in sync. The buffer helps improve system performance and avoid timing errors by reducing skew, which is the difference in timing between the clock outputs. This decrease in signal delay is very important for high-speed digital systems, which need precise timing synchronization to work well and transfer data as quickly as possible.

● Scalability and Flexibility

The NB3L553MNR4G gives clock distribution scalability and flexibility by making it easier to add and combine various clock domains within a system. It acts as a central hub for sending clock messages to different devices, which lets different clock domains work together. This makes it possible to combine different parts with different clocking needs. This meets the needs of complicated systems with multiple processors, FPGAs, ASICs, or other devices that depend on the clock.

Also, the NB3L553MNR4G’s ability to be scaled up or down makes it easy to grow the clock delivery network as system needs change. More NB3L553MNR4G devices can be chained together to increase the fanout capacity and make room for a growing number of devices that need clock signals to be synced. The NB3L553MNR4G is a flexible option for clock distribution because it is scalable and can be changed to fit different system architectures and future system upgrades.

Optimal Design Considerations for the NB3L553MNR4G

● Input and Output Voltage Compatibility

Think about the input and output voltage compatibility to make sure the NB3L553MNR4G works well with different platforms. The buffer works with many different voltage levels, like LVCMOS, LVTTL, and LVPECL. It is important to make sure that the voltage levels of the buffer and the rest of the electronics are the same to avoid signal level mismatches and make sure that the circuit works right.

● Integrity of the clock signal

Maintaining the integrity of the clock signal is essential for a reliable function. Think about the following things to make sure the clock signal quality is at its best:

● Matching the resistance

Match the transmission lines’ characteristic impedance to the NB3L553MNR4G’s impedance needs. This helps cut down on signal echoes and distortions, which can cause timing problems.

● Signal Routing

Pay attention to how clock signals are sent so that there is as little confusion and interference as possible. To keep signal purity, use the right amount of space and shielding.

● Signal Distortions

Use controlled impedance traces, shorten the length of signal lines, and avoid sharp bends or turns in the signal path to reduce signal distortions.

Power and Ground Plane Considerations

To make sure the NB3L553MNR4G works smoothly and quietly, think about the following power and ground plane issues:

  • Capacitors that don’t connect: Put decoupling capacitors near the power source pins of the buffer to filter out high-frequency noise and provide stable power.
  • Grounding: To reduce noise and disturbance, connect the ground pins of the buffer correctly to a clean, low-impedance ground plane.
  • Controlling the clock’s edges and keeping them in sync:
  • Consider the following ways to further reduce skew and make sure the clocks are in perfect sync:
  • Setting the clock’s edge: Use edge control and skew compensation to line up the sides of the clock and reduce timing differences. This can be done by delaying or moving the clock lines as needed to get them in sync.
  • Synchronization: Use the right methods for synchronizing clocks, such as phase-locked loops (PLLs) or delay-locked loops (DLLs), to line up and send clock signals to multiple devices in the right way.

By taking these best design practices into account, you can get the most out of the NB3L553MNR4G in clock distribution applications in terms of speed and reliability. With these things in mind, integration will go smoothly, clock signals will keep their integrity, power and ground planes will be stable, and methods will be used to reduce skew and synchronize clocks exactly.


For clock distribution applications, the NB3L553MNR4G is a low skew 1-to-4 clock fanout buffer that is dependable and effective. Its guaranteed low output-to-output skew and optimal design, layout, and processing techniques make it a top choice for ensuring synchronized clock signals in various high-speed digital systems. By following the guidelines outlined in this comprehensive guide, you can maximize the performance and reliability of your clock distribution system using the NB3L553MNR4G.

Don’t settle for anything less than exceptional clock distribution. Contact ICRFQ today to explore how the NB3L553MNR4G can revolutionize your next embedded system project. Discover firsthand how this remarkable fanout buffer can optimize your clock signals and unlock unparalleled system performance and reliability. Get in touch with us now to embark on a journey of synchronized excellence with the NB3L553MNR4G.

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