49FCT3805AQG8 Integrated Circuits (ICs)

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The 49FCT3805AQG8 is a high performance, multiplexed, 3.3V clock driver with Fanout Buffer. It operates up to a frequency of 240MHz and has a programmable propagation delay of up to 12ns. It is capable of driving multiple output clock signals at a lower frequency than the input signal, thereby allowing for design flexibility. It also has a low-skew, totally independent clock distribution across multiple outputs.

The 49FCT3805AQG8 is designed for synchronous networking applications, such as those involving gigabit Ethernet, fiber channel, synchronous optical networking (SONET), ATM, and general purpose clock distribution. It is a low-cost alternative to other clock drivers, providing higher speed and lower cost. Additionally, the input clock is enabled/disabled through an asynchronous enable/disable pin, enabling it to be used as both a clock reducer/multiplier and a clock enable/disable manager.

Application Field

The 49FCT3805AQG8 is a best-in-class clock driver designed for high-speed, low-cost synchronization of clock signals in various applications. For instance, in optical networks, the 49FCT3805AQG8 can provide single-ended or differential synchronization of clocks by providing wide bandwidth with low boost and skew tolerances over frequency range of up to 240MHz. Additionally, in telecommunication applications, the driver can drive different high-speed nodes at different speeds. In computer systems, the 49FCT3805AQG8 can be used to lower clock speed before distributing the clock to multiple outputs. It can also synchronize clock sources of different speeds.

Working Principle

The 49FCT3805AQG8 works in a similar way to other clock drivers. It takes an input clock, which can have a frequency of up to 240MHz, and then performs various operations on it such as boosting its strength or reducing its frequency, before distributing the voltage-variable, low-skew clocks to its multiple outputs. The clock driver is programmable to reduce its frequency at each output by a certain amount and is designed to test for propagation delay across the entire group of outputs.

The clock driver has an asynchronous enable/disable pin that allows the user to enable or disable the input clock independently from the output clocks. The driver also has a programmable delay line feature that can adjust the phase of the output clock relative to the input clock by a multiple of 4ns, up to 12ns. This allows the 49FCT3805AQG8 to be used as a clock multiplier, in order to increase the clock frequency at any of the outputs without the need for an external clock generator.

The propagation delay test feature of the 49FCT3805AQG8 allows the user to measure the delay skews between different output clocks. This feature is also useful in synchronizing several independent clock sources. The driver also has integrated glitch filtering that ensures glitch-free operation, even over large frequency changes.

In summary, the 49FCT3805AQG8 is a high performance clock driver designed for synchronization applications involving high-speed clock signals. It is capable of boosting the input clock and distributing it to multiple outputs with low boost and skew tolerances over frequency ranges up to 240MHz, and also has a low-skew, totally independent clock distribution across multiple outputs. Additionally, the driver is capable of providing single-ended or differential synchronization of clocks and can be used as a clock multiplier and a delay-skew tester. This makes it an ideal choice for various applications requiring clock synchronization.

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