251MILFT

Overview

The 251MILFT is a single-output, field-programmable clock synthesizer from the VersaClock series by Renesas Electronics. It operates on a 3.3V supply and generates output frequencies up to 200 MHz using an internal Phase-Locked Loop (PLL). The device accepts input crystal frequencies between 5 and 27 MHz and supports configurable spread spectrum modulation to reduce electromagnetic interference. It features four addressable registers for configuration and includes a power-down mode that tri-states outputs and disables the PLL via the PDTS pin.

Feature Summary

• Field-programmable architecture with One-Time Programmable (OTP) ROM and four selectable configuration registers
• Generates output frequencies from 314 kHz to 200 MHz using standard fundamental mode crystals
• Supports configurable spread spectrum modulation for EMI reduction
• Includes power-down feature controlled by the PDTS pin to save power

Applications

• Replacing multiple discrete crystals and oscillators in system designs
• Low-cost clock generation for digital systems requiring spread spectrum capabilities
• Applications needing controllable output drive levels and low-power CMOS operation

Part Context

The 251MILFT belongs to the VersaClock family of programmable clock generators. It is the tape-and-reel variant of the 251PMILF, which is listed as obsolete. The device utilizes IDT's VersaClock software for PLL and output configuration prior to OTP programming.

Replacement Considerations

The 5P35021 is identified as a replacement alternative within the VersaClock 3S family. Designers should verify compatibility regarding package type and specific frequency ranges when substituting.