Infineon/CYPRESS CY25403SXC-005

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. The advantage of having three PLLs is that a single device can generate up to three independent frequencies from a single crystal or reference input frequency. Generally, a design requires up to three oscillators to achieve the same result with a single CY25403 or CY25423. The device uses Cypress proprietary PLL and Spread Spectrum Clock (SSC) technology to synthesize and modulate the frequency of the input clock. By frequency modulating the clock, the measured EMI at the fundamental and harmonic frequencies are greatly reduced. This reduction in radiated energy significantly reduces the cost of complying with regulatory agency (EMC) requirements and improves time - to - market without degrading the system performance. The CY25403 and CY25423 use a factory/field - programmable configuration memory array to provide customization for output frequencies, frequency select options, spread characteristics like spread percentage and modulation frequency, output drive strength and crystal load capacitance. A customized device can be configured using CyberclocksTM software or by contacting the factory. The spread percentage is programmed to either center spread or down spread with various spread percentages. The range for center spread is from ±0.125% to ±2.50%. The range for down spread is from - 0.25% to - 5.0%. Contact the factory for smaller or larger spread percentage amounts, if required. The input to the CY25403 and CY25423 is either a crystal or a clock signal. The input frequency range for crystals is 8 MHz to 48 MHz, and for clock signals is 8 MHz to 166 MHz. The CY25403 and CY25423 have up to three clock outputs and each output has four possible input sources. There are two frequency select lines FS(1:0) that provide an option to select four different sets of frequencies among the each of the three PLLs. Each output has programmable output divider options. Output 1 has eight possible divider values and outputs 2–3 have four possible divider values for maximum flexibility. The 2 bit or 3 bit output dividers are programmable providing a wide output frequency range. The outputs are glitch - free when frequency is switched using output dividers. The outputs have a predictable phase relationship, if the clock source is the same PLL and divider values are 2, 3, 4, or 6. The CY25403 and CY25423 are 3 - PLL memory programmable spread spectrum clock generators with three clock outputs.

• 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
• 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
• Ability to synthesize standard frequencies with ease
• Application compatibility in standard and low - power systems

• PC
• consumer
• networking applications