I2811BF-08SR

Clock Generators, PLLs, Frequency Synthesizers Overview

The I2811BF-08SR is a low power EMI reduction IC designed as a spread spectrum frequency modulator. It generates a 1x low EMI clock from an input frequency range of 10MHz to 40MHz, providing up to 15dB EMI reduction. The device operates at 3.3V with CMOS/TTL compatible inputs and outputs. It features selectable down or center spread options and eight frequency deviation selections ranging from ±0.625% to -3.5%. Packaged in an 8-pin SOIC, it supports industrial temperatures from -40°C to +85°C.

Clock Generators, PLLs, Frequency Synthesizers Feature Summary

• Generates 1x low EMI spread spectrum clock for input frequencies between 10MHz and 40MHz
• Provides up to 15dB EMI reduction using FCC-approved digital modulation
• Configurable spread options (Down/Center) and frequency deviations (±0.625% to -3.5%) via logic pins
• CMOS/TTL compatible inputs and outputs with internal pull-up resistors on configuration pins

Clock Generators, PLLs, Frequency Synthesizers Applications

• EMI management for memory interfaces in mobile graphic chipsets
• High-speed digital applications such as PC peripheral devices
• Consumer electronics requiring reduced electromagnetic interference
• Embedded controller systems utilizing LVDS interfaces

Clock Generators, PLLs, Frequency Synthesizers Procurement Notes

Verify the ordering suffix BF indicates the industrial temperature range (-40°C to +85°C) compared to the commercial P variant. Confirm the SR suffix denotes tape and reel packaging. Ensure the component is lead-free as specified in the ordering code table. Cross-reference the marking ABV with the package type to validate authenticity.

Clock Generators, PLLs, Frequency Synthesizers Selection Notes

Select this part when a 1x output frequency is required relative to the input clock. Choose based on the specific frequency deviation needed by configuring pins D_C and SRS. Verify the input frequency falls within the 10MHz to 40MHz range defined by the FRS pin setting. Consider the 3.3V supply voltage and load capacitance requirements for signal integrity.

Clock Generators, PLLs, Frequency Synthesizers Part Context

This component belongs to the P28XX family of spread spectrum clock generators manufactured by SCILLC, now ON Semiconductor. It is functionally pin-out compatible with Cypress CY25811 devices. The I-prefix denotes the industrial temperature grade, while the P-prefix indicates the commercial grade. All variants share the same core modulation architecture.

Clock Generators, PLLs, Frequency Synthesizers Replacement Considerations

The P2811BF-08SR is pin-compatible with the Cypress CY25811 series. Substitution requires verifying that the replacement device supports the same 10MHz to 40MHz input range and 3.3V operating voltage. Check if the alternative offers identical spread spectrum configurations and deviation percentages.