Multiple-Output Network Clock Generator

The MAX9489 clock generator provides multiple clock outputs, ideal for network routers. The MAX9489 provides 15 buffered clock outputs, each independently programmable to any of 10 individual frequencies: 133MHz, 125MHz, 100MHz, 83MHz, 80MHz, 66MHz, 62.5MHz, 50MHz, 33MHz, or 25MHz. All of the outputs are single-ended LVCMOS. The MAX9489 is controlled through its I²C interface.

At power-up, the frequency of output CLK1 is set by the tri-level input SEL to 100MHz, 125MHz, or 133MHz, while all other outputs are logic low. All outputs are then programmable to any available frequency through the I²C interface. Additionally, all output frequencies are adjustable up or down, by a margin of 5% or 10%, through the I²C interface.

The MAX9489 requires a 25MHz reference that can be either a crystal or an external clock signal. The MAX9489 requires a +3.0V to +3.6V power supply and is available in a 32-pin thin QFN package with an exposed pad for heat removal.

Applications

* Network Hubs, Switches, Routers * Storage Area Networks/Network Attached Storage * Telecom/Networking Equipment

* 15 LVCMOS Outputs with 10 Independently Programmable Frequencies: 133MHz, 125MHz, 100MHz, 83MHz, 80MHz, 66MHz, 62.5MHz, 50MHz, 33MHz, and 25MHz

* 25MHz Crystal or Clock Input Reference

* Programmable Through I²C Interface

* Programmable Output Frequency Margin of ±5% or ±10%

* Pin-Selectable Power-Up Frequency for CLK1 Output: 100MHz, 125MHz, or 133MHz

* Low Output Period Jitter: < 48psRMS

* Output-to-Output Skew < 200ps

* Available in 32-Lead, 5mm x 5mm x 0.8mm, Thin QFN Package

* Operates from +3.0V to +3.6V Power Supply

* Power Dissipation 450mW (typ)

* Extended Temperature Range: -40°C to +85°C