ASM3P2814AF-08SR

Overview

The ASM3P2814AF-08SR is a low power EMI reduction IC designed to attenuate electromagnetic interference in high-speed digital applications. It generates a 4x spread spectrum clock from an input frequency range of 10MHz to 40MHz, producing output frequencies between 40MHz and 160MHz. The device provides up to 15dB of EMI reduction using an FCC-approved all-digital modulation method. Operating at 3.3V with CMOS/TTL compatible I/O, 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 minimizes external components through an internal loop filter.

Feature Summary

• Generates a 4x spread spectrum clock from 10MHz to 40MHz inputs (40MHz to 160MHz outputs)
• Provides up to 15dB EMI reduction via FCC-approved all-digital modulation
• Selectable Down/Center spread modes with eight frequency deviation options
• Pin-out compatible with Cypress CY25814 devices

Applications

• Mobile graphic chipsets
• PC peripheral devices
• Consumer electronics
• Embedded controller systems

Procurement Notes

Verify the package type matches the required form factor, as this specific part number denotes the 8-pin SOIC variant. Confirm that the operating temperature range of 0°C to 70°C aligns with the system requirements, as industrial variants may require different suffixes. Ensure the design supports the 3.3V supply voltage and utilizes the internal pull-up resistors on control pins correctly.

Selection Notes

Select the ASM3P2814AF-08SR when a 4x multiplication of the input clock frequency is necessary for EMI management. This model is appropriate for designs requiring output frequencies up to 160MHz derived from lower input clocks. Consider the available spread options and deviation percentages based on the specific regulatory compliance targets and jitter sensitivity of the downstream memory or LVDS interfaces.

Part Context

This component belongs to the ASM3P28XX family of spread spectrum frequency modulators manufactured by onsemi. It shares architectural similarities with the ASM3P2811A/B and ASM3P2812A/B models but is distinct in its ability to generate a 4x output frequency. The family is designed to reduce system cost by minimizing the need for additional shielding or passive filtering components.

Replacement Considerations

The datasheet explicitly states pin-out compatibility with the Cypress CY25814. Designers replacing legacy parts should verify that the replacement source meets the electrical specifications for the 4x multiplication ratio and the specific frequency deviation settings required by the application.