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

Quad PLL Programmable Spread Spectrum Clock Generator with Serial I2C Interface

特性

• 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
• V_DD supply voltage options:
  • 2.5V, 3.0V, and 3.3V for CY2545
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概述

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.