You are here

CY2545, CY2547: Quad PLL Programmable Spread Spectrum Clock Generator with Serial I2C Interface | Cypress Semiconductor

CY2545, CY2547: Quad PLL Programmable Spread Spectrum Clock Generator with Serial I2C Interface

Last Updated: 
Nov 14, 2017
Version: 
*I

Quad PLL Programmable Spread Spectrum Clock Generator with Serial I2C Interface

Features

  • Four fully integrated phase locked loops (PLLs)
  • Input frequency range
    • External crystal: 8 to 48 MHz
    • External reference: 8 to 166 MHz clock
  • Wide operating output frequency range
    • 3 to 166 MHz
  • Serial programmable over 2-wire I2C interface
  • Programmable spread spectrum with center and down spread option and Lexmark and Linear modulation profiles
  • VDD supply voltage options:
    • 2.5V, 3.0V, and 3.3V for CY2545
  • For more, see pdf

General Description

Four Configurable PLLs

The CY2545 and CY2547 have four I2C programmable PLLs available to generate output frequencies ranging from 3 to 166 MHz. The advantage of having four PLLs is that a single device generates up to four independent frequencies from a single crystal. Two sets of frequencies for each PLL can be programmed. This enables in system frequency switching using multifunction frequency select pin, FS.