Infineon CY25819SXCT

Spread Spectrum Clock Generator (SSCG) ICs are used for the purpose of reducing EMI found in today’s high-speed digital electronic systems. The devices use a proprietary phase-locked loop (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 is greatly reduced. This reduction in radiated energy can significantly reduce the cost of complying with regulatory agency requirements and improve time to market without degrading system performance. The input frequency range is 8–16 MHz for the CY25818 and 16–32 MHz for the CY25819. Both products accept external clock, crystal, or ceramic resonator inputs. The CY25819 provides separate modulated (SSCLK) and unmodulated reference (REFCLK) clock outputs which are the same frequency as the input clock frequency. Down spread frequency modulation can be selected by the user, based on three discrete values of Spread%. A separate power down function is also provided. The CY25819 products are available in an 8-pin SOIC package with a commercial operating temperature range of 0 - 70 °C.

• 8- to 32-MHz input frequency range
• CY25819: 16 MHz to 32 MHz
• Separate modulated and unmodulated clocks
• Accepts clock, crystal, and resonator inputs
• Down spread modulation
• Power-down function
• Low-power dissipation: CY25819 = 36 mW typ at 16 MHz, CY25819 = 63 mW typ at 32 MHz
• Low cycle-to-cycle jitter: SSCLK = 250 ps typ, REFOUT = 275 ps typ
• Available in 8-pin SOIC package

• Printers and MFPs
• LCD panels and notebook PCs
• Digital copiers
• PDAs
• Automotive
• CD-ROM, VCD, and DVD
• Networking and LAN/WAN
• Scanners
• Modems
• Embedded digital systems