W155 - Spread Spectrum Frequency Timing Generator

Cypress Semiconductor

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Datasheet Details

Part number: W155
Manufacturer: Cypress Semiconductor
File Size: 86.45 KB
Datasheet: W155_CypressSemiconductor.pdf
Description: Spread Spectrum Frequency Timing Generator

W155 Product details

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).

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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Published: Apr 17, 2005 |