MK1491-06RLFTR

Overview

The MK1491-06RLFTR 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 within a supply voltage range of 3.15V to 3.45V and supports a maximum frequency of 49.152MHz. It utilizes patented analog PLL techniques for low-jitter performance and features multiple power-down modes to reduce consumption.

Feature Summary

• Generates critical timing for AMD Geode companion chips, including four PCI clocks and AC97 audio support
• Provides selectable PCIF on up to two outputs with early PCI clock selectability
• Includes a Low EMI Enable pin to reduce radiation on PCI clocks
• Supports 48 MHz USB and 24 MHz Super I/O frequencies

Applications

• AMD Geode-based computer systems
• Portable appliance applications
• Super I/O and USB clock generation
• AC97 audio clock synthesis

Procurement Notes

Verify the component status as discontinued or end-of-life through official Renesas channels before procurement planning. Confirm that the tape and reel packaging matches production requirements. Ensure compatibility with the 28-pin SSOP footprint during design validation.

Selection Notes

Select this part for designs requiring specific AMD Geode timing signals without complex programmable logic. Verify that the commercial temperature range (0°C to +70°C) meets environmental constraints. Ensure the 3.3V ±5% supply voltage aligns with the system power architecture.

Part Context

This component belongs to the MK1491 series of clock generators originally developed by IDT and later acquired by Renesas Electronics Corporation. It serves as a dedicated solution for legacy AMD Geode platforms, replacing discrete oscillator and buffer solutions with a single integrated synthesizer.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Designers should consult Renesas Electronics for current alternatives or evaluate generic clock synthesizers with compatible pinouts and electrical specifications.