CDCVF2505 - PLL Clock Driver for Synch. DRAM & Gen. Purp. Apps W/Spread Spectrum Compatibility, Power Down M

The CDCVF2505 is a high-performance, low-skew, low-jitter, phase-lock loop (PLL) clock driver. This device uses a PLL to precisely align the output clocks (1Y[0-3] and CLKOUT) to the input clock signal (CLKIN) in both frequency and phase. The CDCVF2505 operates at 3.3 V and also provides integrated series-damping resistors that make it ideal for driving point-to-point loads.

One bank of five outputs provides low-skew, low-jitter copies of CLKIN. Output duty cycles are adjusted to 50 percent, independent of duty cycle at CLKIN. The device automatically goes into power-down mode when no input signal is applied to CLKIN.

The loop filter for the PLLs is included on-chip. This minimizes the component count, space, and cost.

The CDCVF2505 is characterized for operation from –40°C to 85°C.

Because it is based on the PLL circuitry, the CDCVF2505 requires a stabilization time to achieve phase lock of the feedback signal to the reference signal. This stabilization is required following power up and application of a fixed-frequency, fixed-phase signal at CLKIN, and following any changes to the PLL reference.

• Phase-Lock Loop Clock Driver for Synchronous DRAM and General-Purpose Applications
• Spread Spectrum Clock Compatible
• Operating Frequency: 24 MHz to 200 MHz
• Low Jitter (Cycle-to-Cycle): < |150 ps| (Over 66 MHz to 200 MHz Range)
• Distributes One Clock Input to One Bank of Five Outputs (CLKOUT Used to Tune the Input-Output Delay)
• Three-States Outputs When There Is No Input Clock
• Operates From Single 3.3-V Supply
• Available in 8-Pin TSSOP and 8-Pin SOIC Packages
• Consumes Less Than 100 mA (Typical) in Power-Down Mode
• Internal Feedback Loop Is Used to Synchronize the Outputs to the Input Clock
• 25-Ω On-Chip Series Damping Resistors
• Integrated RC PLL Loop Filter Eliminates the Need for External Components