General Description
   Th CY25403 and CY25423 are three PLL programmable Spread Spectrum Clock Generators used to reduce EMI found in high-speed digital electronic systems. Two of the three PLLs have Spread Spectrum capability. The spread spectrum feature are turned on or off using the control pin SSON.

FEATUREs
• Three 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
• Programmable Spread Spectrum modulation frequency
   range of 30 to 120 kHz with Lexmark profile
• Center Spread: ±0.125% to ±2.5%
• Down Spread: –0.25% to –5%
• Frequency select feature with option to select four different
   frequencies
• Low-jitter, high-accuracy outputs
• Up to three clock outputs
• Programmable output drive strength
• Glitch-free outputs while frequency switching
• Four independent output voltages: 3.3V, 3.0V, 2.5V, and
   1.8V
• 8-pin SOIC package
• Commercial and Industrial temperature range

Benefits
• Multiple high-performance PLLs allow synthesis of
   unrelated frequencies
• Nonvolatile programming for customized PLL frequencies,
   spread spectrum characteristics, drive strength, crystal load
   capacitance, and output frequencies
• Two Spread Spectrum capable PLLs with Lexmark profile
   for maximum for EMI reduction
• Spread Spectrum PLLs can be disabled or enabled
   separately
• PLLs can be programmed for system frequency margin
   tests
• Meets critical timing requirements in complex system
   designs
• Suitable for PC, consumer, and networking applications
• Ability to synthesize standard frequencies with ease
• Application compatibility in standard and low-power
   systems