251MLFT

Overview

The 251MLFT is a field-programmable clock synthesizer from the VersaClock family, manufactured by Renesas Electronics. It operates as a single-output device capable of generating frequencies up to 200 MHz using Phase-Locked Loop (PLL) techniques. The component supports input crystal frequencies between 5 and 27 MHz and accepts clock inputs from 3 to 150 MHz. It features configurable spread spectrum modulation to reduce electromagnetic interference. Designed for low-power applications, it utilizes an advanced CMOS process and includes a power-down feature that tri-states outputs when activated.

Feature Summary

• Field programmability via One-Time Programmable (OTP) ROM with four selectable configuration registers
• Spread Spectrum Clock Generation (SSCG) capability for EMI reduction
• Single output configuration with maximum frequency of 200 MHz
• Power-down mode that disables PLLs and tri-states outputs

Applications

• Replacing multiple discrete crystals and oscillators in system designs
• Low-cost clock generation for embedded systems
• EMI-sensitive digital circuits requiring spread spectrum modulation

Procurement Notes

Verify the specific package type and temperature grade against the datasheet, as suffixes may indicate variations in packaging or environmental ratings. Confirm current availability status, as this part number may be subject to obsolescence notices. Ensure the programming tool or OTP programmer is compatible with the VersaClock configuration requirements before procurement.

Selection Notes

Select this component when a single, programmable clock source is required to replace fixed-frequency oscillators. Verify that the input reference frequency falls within the 5-27 MHz range for crystal inputs or 3-150 MHz for clock inputs. Consider the 8-SOIC package dimensions and the need for external programming if field configurability is necessary over factory programming.

Part Context

This device belongs to the VersaClock series of clock synthesizers. It serves as a flexible alternative to standard crystal oscillators, allowing design customization through software configuration. The 'MLFT' suffix typically denotes the 8-SOIC package and lead-free RoHS compliance, distinguishing it from other package options or non-compliant variants within the same functional family.

Replacement Considerations

Direct replacements include other VersaClock programmable synthesizers such as the 5P35021. When substituting, verify pin compatibility and ensure the replacement supports the required output frequency and spread spectrum modulation depth.