181M-51LF

Overview

The 181M-51LF is a Spread Spectrum Clock Generator manufactured by Renesas Electronics Corporation. It utilizes Phase-Locked Loop (PLL) technology to generate clock signals from an input crystal or clock source, typically operating within a frequency range up to 28 MHz. The device is designed to reduce electromagnetic interference (EMI) through spread spectrum modulation techniques. It operates on a single power supply voltage ranging from 3.135 V to 5.5 V and is housed in an 8-SOIC surface-mount package with a width of 3.90 mm. The component supports CMOS output levels and is intended for applications requiring precise clock generation with minimized noise profiles.

Feature Summary

• Integrated Spread Spectrum Clock Generator functionality to reduce EMI
• Operates on a single 3.135 V to 5.5 V power supply
• Housed in an 8-SOIC surface-mount package
• Supports input frequencies up to 28 MHz

Applications

• General-purpose clock generation in embedded systems
• Applications requiring EMI reduction via spread spectrum modulation
• Systems utilizing standard fundamental mode crystals

Procurement Notes

Verify the current lifecycle status of the 181M-51LF before procurement planning. Public distributor records indicate this specific part number may be obsolete or end-of-life. Confirm availability through authorized Renesas channels or verify if alternative suffixes are currently active. Ensure that any substitute components meet the required electrical specifications and package dimensions for your design.

Selection Notes

Select the 181M-51LF when a fixed-frequency spread spectrum clock generator is required for EMI mitigation. Verify that the input crystal frequency matches the device's operational range. Consider the 8-SOIC package constraints for PCB layout. If field programmability is needed, review datasheets for VersaClock series alternatives, as this model appears to be a fixed-function generator rather than a programmable synthesizer.

Part Context

The 181M-51LF belongs to the broader family of clock generators produced by Renesas Electronics, often associated with legacy ICS (Integrated Circuit Systems) product lines acquired by Renesas. These devices are typically used to replace multiple discrete oscillators, saving board space. The 'LF' suffix generally denotes lead-free compliance, adhering to RoHS standards.