Clock Generators Support Multiple MIPS-Family Processors

Dec. 4, 2003
With spread-spectrum support, a clock-generator pair from PMC-Sierra supplies flexible timing and low emitted RF radiation for the company's RM5000, 7000, and 9000 lines of MIPS processors. These generators operate from 50 to 200 MHz and include a...

With spread-spectrum support, a clock-generator pair from PMC-Sierra supplies flexible timing and low emitted RF radiation for the company's RM5000, 7000, and 9000 lines of MIPS processors. These generators operate from 50 to 200 MHz and include a single phase-locked loop. Also, an available low-skew clock buffer provides dual 1-to-8 fanouts and can handle clock speeds of up to 200 MHz.

The CM5371 clock generator, which can be used with both the RM7000 and 5000 CPU families, delivers four single-ended low-voltage TTL outputs. It typically consumes about 360 mW. Designed for the RM9000 series of CPUs, the CM5391L generator delivers one differential low-voltage differential-signalling output and two single-ended low-voltage TTL outputs. It typically consumes just 300 mW. The CM74CB218 clock buffer works with either clock generator and consumes 425 mW.

Both generators' integrated spread-spectrum control lowers the level of electromagnetic interference generated by the high-speed clock signal. By doing so, it plays a significant role in complying with radiation emissions rules, such as Federal Communications Commission (FCC) Class B guidelines. It also reduces the amount of shielding that systems might otherwise require, lowering cost and simplifying the manufacturing process.

All three devices are available in environmentally friendly lead-free small-outline packages.The clock generators come in 20-lead packages, while the buffer is housed in a 28-lead package. The CM5371 and CM5391L cost $4.50 and $7.50 each, respectively, while the CM74CB218 buffer goes for $3.45 each, all in lots of 10,000 units.

PMC-Sierra Inc.www.pmc-sierra.com/clk

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