Product category: Communications ICs (Wired)
News Release from: IDT | Subject: 5T940
Edited by the Electronicstalk Editorial Team on 23 July 2003
Precise clocks for Gigabit Ethernet and Sonet
IDT's 5T940 precision clock generation devices achieve ultra-low jitter of less than 0.5ps RMS, making them ideal for Gigabit Ethernet and Sonet applications up to OC-192.
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IDT's 5T940 precision clock generation devices achieve ultra-low jitter of less than 0.5ps RMS, making them ideal for gigabit Ethernet and Sonet applications up to OC-192. The new devices provide two independent clock outputs, with three modes of operation, making them more flexible than alternative solutions. The 5T940 precision clock generators offer a host of other value-added features, including a "jitter-cleaning" capability, selectable-loop bandwidth, a wide range of multiply options and hitless auto switchover capability for robust clock redundancy.
The two independent clock outputs support three modes of operation: 155.5 to 166.6MHz, 622 to 666.5MHz output; 155.5 to 166.6MHz output, regenerated version of input clock; and 622 to 666.5MHz output, regenerated version of input clock.
The IDT 5T940 clock generators include a clock regeneration feature that is able to attenuate jitter from recovered clocks from line transceiver devices.
To support robust clock redundancy for high-performance applications, the clock generators provide a hitless switchover capability, with period deviation as low as 0.005% per cycle.
The devices also support multiplier ratios of 2, 4, 8, 16 and 32, and feature selectable-loop bandwidth, which allow the 5T940 clock generators to be tuned for specific applications.
The jitter cleaning capability enables the device to accept an input clock with relatively high jitter, and then reduce the jitter to meet the requirements of a line transmission device such as a Sonet or Gigabit Ethernet transceiver.
In addition, the 5T940 clock generators can be used in conjunction with the IDT WAN PLL devices to provide Stratum-3 compliant clock generation that also meets Sonet/SDH jitter requirements.
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