概览
描述
840304I is an optimized PCI-X and PCI-e clock generator and a member of the family of high performance clock solutions from IDT. The 840304I uses a 25MHz parallel crystal to generate 33.33MHz to 133.33MHz clock signals, replacing solutions requiring multiple oscillator and fanout buffer solutions. The device supports 1% downspread spread spectrum clocking. The 840304I has excellent phase jitter (<1ps rms) over integration range of 1.5MHz - 22MHz. Designed for Backplane, networking and industrial applications, the 840304I can also drive the high-speed PCI-X and PCI-e SerDes clock inputs of communication processors, DSPs, switches and bridges.
特性
- Four LVCMOS/LVTTL outputs, 20Ω typical output impedance One REF_OUT LVCMOS/LVTTL clock output
- Selectable crystal oscillator interface, 25MHz, 18pF parallel resonant crystal or LVCMOS/LVTTL single-ended clock input
- Support the following output frequencies: 33.33MHz, 66.67MHz, 100MHz or 133.33MHz
- VCO: 400MHz
- PLL and N divider bypass and output enable
- RMS phase jitter @100MHz, using a 25MHz crystal, (1.5MHz - 22MHz): 0.46ps (typical) @ 3.3V
- Supports SSC, 1% downspread
- Full 3.3V and 2.5V supply modes
- -40°C to 85°C ambient operating temperature
- Available in and lead-free (RoHS 6) package
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