M2006-03-491.5200

Clock Generators, PLLs, Frequency Synthesizers Overview

The M2006-03-491.5200 is a VCSO-based clock generator designed for frequency translation and jitter attenuation in cable modem termination systems (CMTS). It features an integrated SAW delay line with a center frequency of 491.52 MHz. The device accepts single-ended LVCMOS/LVTTL reference inputs at 2.048, 4.096, 10.24, or 20.48 MHz. It provides differential LVPECL outputs: two downstream clocks (245.76 or 491.52 MHz), one upstream clock (40.96 to 491.52 MHz), and a fixed 10.24 MHz system reference. Jitter performance is typically 9 ps rms (100 Hz–12 kHz) and 3 ps rms (12 kHz–1 GHz). It operates on a single 3.3V supply within a 9x9 mm ceramic leadless chip carrier package.

Clock Generators, PLLs, Frequency Synthesizers Feature Summary

• Integrated SAW delay line VCSO with 491.52 MHz center frequency
• Differential LVPECL outputs for downstream, upstream, and reference clocks
• Phase-slope limiting feature to prevent disruptive phase changes during input reselection
• Supports multiple input reference frequencies via selectable feedback dividers

Clock Generators, PLLs, Frequency Synthesizers Applications

• Cable Modem Termination Systems (CMTS)
• Frequency translation for DOCSIS modem applications
• Jitter attenuation of master reference clocks

Clock Generators, PLLs, Frequency Synthesizers Procurement Notes

Verify the manufacturer as Integrated Circuit Systems, Inc. (ICS) rather than Renesas Electronics Corporation, as the datasheet identifies ICS as the producer. Confirm the specific suffix -491.5200 matches the required 491.52 MHz VCSO frequency. Ensure external loop filter components are sourced according to the selected input reference frequency table.

Clock Generators, PLLs, Frequency Synthesizers Selection Notes

Select this component when designing CMTS architectures requiring low-jitter clock distribution from a single reference. Choose based on the available input reference frequency (2.048, 4.096, 10.24, or 20.48 MHz) to determine the correct feedback divider settings. Verify that the output frequency requirements for downstream (245.76/491.52 MHz) and upstream (40.96–491.52 MHz) paths align with the internal divider configurations.

Clock Generators, PLLs, Frequency Synthesizers Part Context

This part belongs to the M2006 series of direct conversion clock sources. The -491.5200 variant is specifically optimized for DOCSIS applications by providing integer multiples of common telecom reference frequencies. It replaces discrete PLL and oscillator solutions with a single integrated package.

Clock Generators, PLLs, Frequency Synthesizers Replacement Considerations

No public confirmed substitute part numbers are documented in the provided source material.