MK1491-06RLF

Overview

The MK1491-06RLF is a clock synthesizer designed for AMD Geode-based computer and portable appliance applications. It accepts a 14.318 MHz crystal input to generate multiple output clocks, including selectable PCI local bus, AC97 audio, 24 MHz, and 48 MHz clocks. The device operates at a maximum frequency of 49.152MHz with a 1:10 input-to-output ratio. It utilizes patented analog PLL techniques and features LVCMOS outputs. Power supply voltage ranges from 3.15V to 3.45V, and it functions within an operating temperature range of 0°C to 70°C. The component is housed in a 28-SSOP package.

Feature Summary

• Generates critical timing for AMD Geode companion chips, including four PCI clocks and AC97 audio support.
• Features a dedicated Low EMI Enable pin that reduces electromagnetic interference radiation on PCI clocks.
• Includes multiple power-down modes to minimize power consumption during idle states.
• Supports selectable PCIF functionality on up to two outputs with early PCI clock selectability.

Applications

• AMD Geode-based desktop computers
• Portable appliance systems
• Super I/O and USB controller clocking (24 MHz/48 MHz)
• AC97 audio subsystem synchronization

Procurement Notes

Verify the manufacturer designation as Renesas Electronics Corporation while noting the original design by IDT. Confirm the specific suffix 'RLF' corresponds to the lead-free, RoHS-compliant version packaged in tubes. Ensure compatibility with the 28-SSOP footprint dimensions specified in the datasheet before procurement.

Selection Notes

Select this component specifically for AMD Geode platform designs requiring integrated clock synthesis. Verify that the 0°C to +70°C commercial temperature rating meets system requirements, as industrial variants (-40°C to +85°C) exist under different part numbers like MK1491-06RILF. Ensure the 3.3V ±5% supply voltage aligns with the target board's power rails.

Part Context

This component belongs to the MK1491 series of clock synthesizers originally developed by Integrated Device Technology (IDT). Following Renesas Electronics Corporation's acquisition of IDT, these products are now marketed under the Renesas brand. The MK1491-06 is distinct from other series members like the MK1491-09, which targets different frequency ratios and applications.

Replacement Considerations

For industrial temperature range requirements (-40°C to +85°C), consider the MK1491-06RILF or MK1491-06RILFTR. For tape and reel packaging options in the commercial range, the MK1491-06RLFTR is available. Direct functional substitutes are not explicitly listed; verify pinout and electrical parameters against alternative vendors if sourcing from non-Renesas channels.