251M-30LFT

Overview

The 251M-30LFT is a field-programmable spread-spectrum clock synthesizer manufactured by Renesas Electronics Corporation. It belongs to the VersaClock family and utilizes an internal Phase-Locked Loop (PLL) to generate output frequencies up to 200 MHz from input crystal frequencies between 5 MHz and 27 MHz. The device features four addressable configuration registers and One-Time Programmable (OTP) ROM for field programmability, allowing it to replace multiple discrete crystals and oscillators. It operates at 3.3 V and includes a power-down feature that tri-states outputs when the PDTS pin is asserted low.

Feature Summary

• Field-programmable architecture with OTP ROM and four selectable configuration registers
• Output frequency range of 314 kHz to 200 MHz using PLL techniques
• Configurable Spread Spectrum Modulation to reduce system EMI
• Power-down mode via PDTS pin for low-power applications

Applications

• Replacing multiple discrete crystals and oscillators in embedded systems
• Generating clock signals for high-speed digital circuits requiring spread spectrum modulation
• Low-cost single-output clock generation in consumer electronics

Part Context

The 251M-30LFT is part of the IDT/Renesas VersaClock series of clock synthesizers. This product line focuses on providing flexible, software-configurable clock solutions that simplify board design by consolidating multiple clock sources into a single integrated circuit. The '251' designation typically refers to the base VersaClock 3S or similar programmable synthesizer family within the Renesas portfolio.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. Designers should verify compatibility with specific VersaClock variants such as the 5P35021 or consult official Renesas cross-reference tools for equivalent functionality.