W155 - Spread Spectrum Frequency Timing Generator

Product Overview

Cypress Semiconductor

Datasheet Details

Part number	W155
Manufacturer	Cypress Semiconductor
File Size	86.45 KB
Description	Spread Spectrum Frequency Timing Generator
Datasheet	W155 Datasheet
Additional preview pages of the W155 datasheet.

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 |