MK1491-09FTR

Overview

The MK1491-09FTR is a clock frequency synthesizer integrated circuit manufactured by Renesas Electronics Corporation, designed specifically for AMD CPU applications. It operates with a crystal input and provides a single clock output through a 1:12 input-to-output ratio. The device supports a maximum frequency of 66MHz and functions within a supply voltage range of 3.15V to 3.45V. It does not include an internal PLL or differential signaling capabilities. The component is housed in a 28-SSOP package with a width of 5.30mm and is rated for operation between 0°C and 70°C.

Feature Summary

• Designed for AMD CPU clock generation
• Crystal input with 1:12 frequency ratio
• Maximum operating frequency of 66MHz
• Single-ended clock output

Applications

• AMD CPU clock synthesis
• System timing circuits
• Computer motherboard designs

Procurement Notes

This component is officially listed as obsolete by the manufacturer. Verification of availability should focus on surplus distributors rather than direct manufacturing channels. Buyers must confirm the specific tape-and-reel packaging format associated with the FTR suffix and ensure compliance with non-RoHS environmental standards prior to procurement.

Selection Notes

Select this part only if the design requires a fixed 66MHz output for legacy AMD processors. The absence of a PLL limits frequency flexibility compared to programmable alternatives. Ensure the PCB layout accommodates the 28-SSOP footprint and that the power supply maintains the required 3.15V to 3.45V range for stable operation.

Part Context

The MK1491-09FTR belongs to the MK1491 series of clock generators. It shares core specifications with variants like the MK1491-09FLN but differs in packaging and temperature rating. The FTR suffix indicates a tape-and-reel configuration suitable for automated surface-mount assembly, distinguishing it from tube-packaged versions.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. Due to the obsolete status, alternative solutions require evaluating modern clock synthesizers with compatible voltage levels and output frequencies.