MK1491-09FLN

Overview

The MK1491-09FLN is a clock/frequency synthesizer integrated circuit manufactured by Renesas Electronics Corporation, designed primarily for AMD CPU applications. It features a single circuit with a crystal input and generates up to twelve clock outputs at a maximum frequency of 66MHz. The device operates within a supply voltage range of 3.15V to 3.45V and supports an industrial operating temperature range of 0°C to 70°C. Packaged in a 28-SSOP surface-mount case measuring 5.30mm in width, it utilizes a Phase-Locked Loop (PLL) for frequency synthesis without differential signaling capabilities.

Feature Summary

• Generates 12 clock outputs from a single crystal input with a 1:12 ratio
• Maximum output frequency of 66MHz optimized for AMD CPU architectures
• Operates on a 3.15V to 3.45V power supply with standard LVCMOS outputs
• Integrated PLL for stable frequency generation in a compact 28-SSOP package

Applications

• AMD CPU clock distribution systems
• System timing synchronization for legacy computing platforms
• Industrial control boards requiring specific 66MHz reference clocks

Procurement Notes

Verify component authenticity through authorized distributors as the part may be subject to obsolescence notices. Confirm RoHS compliance status and moisture sensitivity level prior to integration. Check for recent Product Change Notifications regarding packaging or labeling updates that do not alter electrical specifications.

Selection Notes

Select this component when a fixed 66MHz clock source is required for AMD-based processors. Ensure the design accommodates the 3.15V-3.45V supply rail and 0°C-70°C thermal environment. The 28-SSOP footprint requires appropriate PCB land pattern dimensions matching the 5.30mm width specification.

Part Context

This device belongs to the MK1491 series of application-specific clock generators. It serves as a dedicated timing solution for older AMD processor generations, replacing discrete oscillator circuits with a single integrated chip. The FLN suffix indicates the tube packaging variant suitable for automated assembly processes.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. Designers should consult Renesas Electronics for current lifecycle status and potential end-of-life alternatives.