Low Voltage,Low Skew,PCI/PCI-X Clock Generator

The 8761 is a low voltage, low skew PCI / PCI-X Clock Generator. The 8761 has a selectable REF_ CLK or crystal input. The REF_CLK input accepts LVCMOS or LVTTL input levels. The 8761 has a fully integrated PLL along with frequency configurable clock and feedback outputs for multiplying and regenerating clocks with "zero delay". Using a 20MHz or 25MHz crystal or a 33.333MHz or 66.666MHz reference frequency, the 8761 will generate output frequencies of 33.333MHz, 66.666MHz, 100MHz and 133.333MHz simultaneously. The low impedance LVCMOS/LVTTL outputs of the 8761 are designed to drive 50O series or parallel terminated transmission lines.

• Fully integrated PLL
• Seventeen LVCMOS/LVTTL outputs, 15O typical output impedance
• Selectable crystal oscillator interface or LVCMOS/LVTTL REF_CLK
• Maximum output frequency: 166.67MHz
• Maximum crystal input frequency: 38MHz
• Maximum REF_CLK input frequency: 83.33MHz
• Individual banks with selectable output dividers for generating 33.333MHz, 66.66MHz, 100MHz and 133.333MHz simultaneously
• Separate feedback control for generating PCI / PCI-X frequencies from a 20MHz or 25MHz crystal or 33.333MHz or 66.666MHz reference frequency
• Cycle-to-cycle jitter: 70ps (maximum)
• Period jitter, RMS: 17ps (maximum)
• Output skew: 230ps (maximum)
• Bank skew: 40ps (maximum)
• Static phase offset: 0 ± 150ps (maximum)
• Full 3.3V or 3.3V core, 2.5V multiple output supply modes
• 0°C to 85°C ambient operating temperature
• Available in lead-free RoHS-compliant package