MK1491-06R

Overview

The MK1491-06R is a clock synthesizer designed for AMD Geode-based computer and portable appliance applications. It utilizes patented analog PLL techniques to accept a 14.318 MHz crystal input and generate multiple output clocks, including selectable PCI local bus, AC97 audio, 24 MHz, and 48 MHz clocks. The device operates within a supply voltage range of 3.15V to 3.45V and supports a maximum frequency of 49.152MHz. It features a 1:10 input-to-output ratio with LVCMOS outputs in a 28-QSOP package.

Feature Summary

• Generates critical timing for AMD Geode companion chips, including four PCI clocks and AC97 audio support.
• Includes a Low EMI Enable pin that reduces electromagnetic interference radiation on PCI clocks.
• Offers multiple power-down modes to minimize power consumption during idle states.
• Provides 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 interfaces requiring 24 MHz or 48 MHz clocks

Procurement Notes

Verify the specific suffix 'R' against the manufacturer's ordering guide to confirm the 28-pin SSOP tube packaging configuration. Confirm RoHS compliance status as lead-free variants exist within the MK1491-06 family. Check current product lifecycle status, as this component may be subject to discontinuation notices.

Selection Notes

Select this component when designing for AMD Geode platforms requiring precise 14.318 MHz reference synthesis. Ensure the design accommodates the 3.3V ±5% supply requirement and provides adequate decoupling capacitors (0.1µF) near each VDD pin. Verify that the 28-QSOP footprint matches the PCB layout constraints.

Part Context

This part belongs to the MK1491-06 series of clock generators originally developed by Integrated Device Technology (IDT) and later acquired by Renesas Electronics. It serves as a specialized timing solution for legacy x86 embedded architectures based on the AMD Geode processor line.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. Designers should consult the official datasheet for potential cross-reference recommendations or contact the manufacturer directly for obsolescence management options.