ASM3P2811BF-08SR

Overview

The ASM3P2811BF-08SR is a low power EMI reduction IC designed to attenuate electromagnetic interference by generating spread spectrum clocks. It accepts input frequencies from 10MHz to 40MHz and outputs the same frequency (1x multiplication). The device provides up to 15dB of EMI reduction using an FCC-approved all-digital modulation method. Operating at 3.3V, it features selectable center or down spread options with frequency deviations ranging from ±0.625% to -3.5%. The component utilizes an internal loop filter to minimize external components and is available in an 8-pin SOIC package.

Feature Summary

• Generates a 1x low EMI spread spectrum clock from inputs between 10MHz and 40MHz
• Provides up to 15dB EMI reduction via FCC-approved digital modulation
• Selectable Down Spread and Center Spread modes with eight deviation levels
• CMOS/TTL compatible inputs and outputs with 3.3V operating voltage

Applications

• EMI management for memory interfaces in mobile graphic chipsets
• High-speed digital applications such as PC peripheral devices
• Consumer electronics requiring system-wide EMI reduction
• Embedded controller systems

Procurement Notes

Verify the ordering suffix 'BF' corresponds to the commercial temperature range of 0°C to 70°C and the 8-pin SOIC tape and reel packaging configuration. Confirm that the specific part number matches the required frequency deviation and spread selection settings defined in the datasheet tables before procurement.

Selection Notes

Select this model when a 1:1 frequency ratio is required for clock spreading. Ensure the application input frequency falls within the 10MHz to 40MHz range. Choose the 'B' variant if the specific frequency deviation percentages associated with the B-series logic table are required rather than the A-series values.

Part Context

This component belongs to the ASM3P28XX family of spread spectrum frequency modulators. It is pin-out compatible with Cypress CY25811, CY25812, and CY25814 devices. The 'A' and 'B' suffixes denote different combinations of spread options and percentage deviations, while the 'F' indicates the SOIC package type.

Replacement Considerations

Cypress CY25811 is a pin-compatible alternative within the same functional category.