W181-01G

Clock Generators, PLLs, Frequency Synthesizers Overview

The W181-01G is a spread spectrum frequency timing generator from the Cypress PREMIS family, designed to reduce peak EMI by modulating clock signals. It operates on a single 3.3V or 5V supply and accepts input frequencies between 28 MHz and 75 MHz. The device generates an output clock with selectable down or center spread percentages of 1.25% or 3.75%. Key electrical parameters include a maximum cycle-to-cycle jitter of 300 ps, output rise/fall times of 5 ns max, and a duty cycle range of 40% to 60%. It features integrated loop filter components and is housed in an 8-pin SOIC package.

Clock Generators, PLLs, Frequency Synthesizers Feature Summary

• Generates EMI-optimized clocking signals through frequency modulation
• Includes integrated loop filter components for simplified design
• Supports selectable spread spectrum modes including down and center spread
• Operates with low-power CMOS technology on standard voltage supplies

Clock Generators, PLLs, Frequency Synthesizers Applications

• Systems requiring reduced radiated electromagnetic interference
• Clock distribution networks synchronized to reference inputs
• Digital systems needing compliance with strict EMI testing standards

Clock Generators, PLLs, Frequency Synthesizers Procurement Notes

Verify component authenticity through authorized Infineon distributors or Cypress Semiconductor channels. Confirm the specific ordering code matches the required package type and temperature range. Ensure documentation aligns with the original manufacturer specifications before integration into production designs.

Clock Generators, PLLs, Frequency Synthesizers Selection Notes

Select the W181-01G variant when an 8-pin SOIC package is required for board space constraints. Verify that the input frequency falls within the 28 MHz to 75 MHz operational range. Consider the available spread percentage options based on the specific EMI reduction targets and system frequency tolerances.

Clock Generators, PLLs, Frequency Synthesizers Part Context

This component belongs to the Cypress PREMIS family of spread spectrum frequency synthesizers. It utilizes phase-locked loop techniques to modulate output clocks, thereby increasing bandwidth and reducing harmonic amplitudes. This technology allows systems to meet EMI requirements without additional shielding.

Clock Generators, PLLs, Frequency Synthesizers Replacement Considerations

Direct replacements are not explicitly listed in the provided datasheet. Designers should evaluate other spread spectrum generators from the same family, such as the W181-02G or W181-03G, ensuring pin compatibility and frequency range alignment.