IDT unveils precision clock generation devices for SONET and Gigabit Ethernet applications

17 June 2003 Santa Clara, CA Lightwave--Communications IC provider Integrated Device Technology, Inc., (IDT) entered the high-precision clock generation market with new patent-pending devices that combine independent clock outputs with phased-locked loop (PLL) technology. The 5T940 clock generators achieve ultra-low jitter generation of less than 0.5-psec RMS, ideal for Gigabit Ethernet and SONET applications up to OC-192.

The 5T940 devices 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 percent 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.

The two independent clock outputs support three modes of operation: 155.5 to 166.6 MHz, 622 to 666.5 MHz output; 155.5 to 166.6 MHz output, regenerated version of input clock; and 622 to 666.5 MHz output, regenerated version of input clock.

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.

The clock generation devices are priced at $39 each in 10,000-piece quantities. Samples are available now with production planned in the third quarter of this year.