IDT49FCT3805AQI

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The IDT49FCT3805AQI is a dual retiming buffer which provides two low skew sources for system clocks. This device accommodates two types of input: differential LVPECL or LVDS; supporting switchovers from LVPECL inputs to LVDS. Its outputs are LVCMOS or LVTTL and include 34mA source and sink capability. The IDT49FCT3805AQI is characterized for operation from 0°C to +70°C and -40°C to +85°C, and is ideally suited for clock distribution in board-level applications.

Application Field: The IDT49FCT3805AQI is a versatile dual retiming buffer that is suited for many applications including board-level distributions in telecom, datacom, and computer motherboards. Since it is designed with differential features, it can greatly reduce the total transmission jitter of the system. Additionally, the device is designed to have a common mode range that is −1000mV to +4000mV. This range allows noise to be effectively rejected while maintaining standard LVCMOS/LVTTL levels. Overall, this device is a low-cost and reliable choice for board level retiming.

Working Principle: The IDT49FCT3805AQI uses a feedback technique to ensure the clock-to-clock accuracy and propagation delay relationship. The device is based on two delay stages which share a common voltage supply and two outputs that both have their active states simultaneously triggered by the chip\'s clock input. The feedback loop adjusts the delay of each stage so that the output pulse width is exactly the same as the input independent of environmental variation and temperature. The device is designed to pass only one picture clock per input, since it operates with a fixed rise and fall time, and therefore performs properly-metered duty cycle corrections. To ensure that duty cycle is not distorted, the device includes an incorrect duty cycle fail-safe feature that automatically adjusts delay times when duty cycle constraints are exceeded. Additionally, to minimize noise, the output is completely turned off for a few nanoseconds when switching a output rail from one state to another. This feature reduces the electrical noise generated by clocks and signals passing through the device.

The IDT49FCT3805AQI is an ideal solution for board-level clock distribution networks. Its robustness and stable performance in a variety of environmental conditions makes it an excellent choice for applications that require multiple and synchronized clock sources. Thanks to its feature set and its flexibility, this device can provide reliable clock distribution and can save system designers time and money.

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