251PMLFT

Overview

The Renesas 251PMLFT is a field-programmable clock synthesizer belonging to the VersaClock series. It operates as a single-output device capable of generating frequencies up to 200 MHz using an internal Phase-Locked Loop (PLL). The component supports spread spectrum clock generation to mitigate electromagnetic interference. It accepts input crystal frequencies between 5 and 27 MHz or clock signals from 3 to 150 MHz. Powered by a 3.3 V supply, it features configurable output drive levels and includes a power-down mode that tri-states outputs. The device utilizes One-Time Programmable (OTP) ROM for configuration storage.

Feature Summary

• Field-programmable architecture with OTP ROM and four selectable configuration registers
• Spread spectrum modulation capability for EMI reduction
• Single CMOS output with controllable drive levels
• Power-down feature via PDTS pin for low-power operation

Applications

• Replacing multiple discrete crystals and oscillators in embedded systems
• Generating precise clock signals for digital logic circuits
• EMI-sensitive applications requiring spread spectrum techniques

Procurement Notes

Verify the obsolete status of this component against current manufacturer announcements. Confirm availability through authorized distributors or secondary market suppliers. Ensure compatibility with existing board layouts when sourcing replacements. Check for RoHS compliance documentation if required for specific regulatory standards.

Selection Notes

Select this part for designs requiring a single programmable clock output up to 200 MHz. Verify that the input source matches the supported frequency ranges of 5-27 MHz for crystals or 3-150 MHz for clocks. Consider the 8-SOIC package dimensions for PCB footprint constraints. Evaluate the need for field programmability versus factory-programmed versions based on production volume.

Part Context

This component is part of the IDT/Renesas VersaClock family, specifically designed as a low-cost solution for clock generation. It replaces legacy discrete oscillator solutions to save board space. The 'F' suffix indicates RoHS compliance, while 'T' denotes tape-and-reel packaging. It succeeds earlier fixed-frequency oscillator designs in VersaClock applications.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided data.