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W155 - Spread Spectrum Frequency Timing Generator

General Description

USB Clock Output/Modulation Width Selection Input: When an input; if spread spectrum feature is enabled, this pin is used to select the amount of frequency variation on the SYSCLK output (see Table 2).

Wider variations result in greater peak EMI reduction.

Key Features

  • Generates a spread spectrum timing signal (SYSCLK) and a non-spread signal (USBCLK).
  • Requires a 14.318-MHz crystal for operation.
  • Supports MIPS microprocessor clock frequencies.
  • Reduces peak EMI by as much as 12 dB.
  • Integrated loop filter components.
  • Cycle-to-cycle jitter = 250 ps (max).
  • Operates with a 3.3 or 5.0V power supply.
  • Spread output is selectable from 10 to 133 MHz.
  • TEST mode supports modulation off (High.

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The following content is an automatically extracted verbatim text from the original manufacturer datasheet and is provided for reference purposes only.

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W155 Spread Spectrum Frequency Timing Generator Features • Generates a spread spectrum timing signal (SYSCLK) and a non-spread signal (USBCLK) • Requires a 14.318-MHz crystal for operation • Supports MIPS microprocessor clock frequencies • Reduces peak EMI by as much as 12 dB • Integrated loop filter components • Cycle-to-cycle jitter = 250 ps (max) • Operates with a 3.3 or 5.0V power supply • Spread output is selectable from 10 to 133 MHz • TEST mode supports modulation off (High-Z) and special test input reference frequency • Guaranteed 45/55 duty cycle • Packaged in a 16-pin, 300-mil-wide SOIC (Small Outline Integrated Circuit) Table 1. Frequency Selection (14.