特性
- One selectable differential LVPECL output pair for DDR 533/400/667
- Six LVCMOS/ LVTTL outputs, 15? typical output impedance - One selectable core clock for the processor - One selectable clock for the PCI/ PCI-X bus - One 125MHz clock reference for GbE MAC - Three 25MHz clock references for GbE PHY
- Selectable external crystal or differential (single-ended) input source
- Crystal oscillator interface designed for 25MHz, parallel resonant crystal
- Differential input pair (CLK, nCLK) accepts LVPECL, LVDS, SSTL input levels
- Internal resistor bias on nCLK pin allows the user to drive CLK input with external single-ended (LVCMOS/ LVTTL) input levels
- RMS phase jitter @ 125MHz, using a 25MHz crystal (1.875MHz - 20MHz): 0.78ps (typical), QD output
- Output supply: LVPECL - 3.3V Core LVCMOS -Core/Output 3.3V/3.3V 3.3V/2.5V
- -40°C to 85°C ambient operating temperature
- Available in lead-free (RoHS 6) package
描述
The 8430S07I is a PLL-based clock generator specifically designed for Cavium Networks SoC processors. This high performance device is optimized to generate the processor core reference clock, the DDR reference clocks, the PCI/PCI-X bus clocks, and the clocks for both the Gigabit Ethernet MAC and PHY. The clock generator offers ultra low-jitter, low-skew clock outputs, and edge rates that easily meet the input requirements for the CN3005/CN3010/CN3020 processors. The output frequencies are generated from a 25MHz external input source or an external 25MHz parallel resonant crystal. The extended temperature range of the 8430S07I supports telecommunication, networking, and storage requirements.