ICS87973I-147

1. System Clock generator: Use a 16.66MHz reference clock to generate eight 33.33MHz copies for PCI and four 100MHz copies for the CPU or PCI-X.

2. Line Card Multiplier: Multiply differential 62.5MHz from a back plane to single-ended 125MHz for the line Card ASICs and Gigabit Ethernet Serdes.

3. Zero Delay buffer for Synchronous memory: Fan out up to twelve 100MHz copies from a memory controller reference clock to the memory chips on a memory module with zero delay.

The ICS87973I-147 is a LVCMOS/LVTTL clock generator and a member of the HiPerClockS™ family of High Performance Clock Solutions from ICS. The ICS87973I-147 has three selectable inputs and provides 14 LVCMOS/LVTTL outputs.

The ICS87973I-147 is a highly flexible device. The three selectable inputs (1 differential and 2 single ended inputs) are often used in systems requiring redundant clock sources. Up to three different output frequencies can be generated among the three output banks.

The three output banks and feedback output of the ICS87973I-147 each have their own output dividers which allows the device to generate a multitude of different bank frequency ratios and output-to-input frequency ratios. In addition, 2 outputs in Bank C (QC2, QC3) can be selected to be inverting or non-inverting. The output frequency range is 10MHz to 150MHz. The input frequency range is 6MHz to 120MHz.

The ICS87973I-147 also has a QSYNC output which can be used for system synchronization purposes. It monitors Bank A and Bank C outputs and goes low one period prior to coincident rising edges of Bank A and Bank C clocks. QSYNC then goes high again when the coincident rising edges of Bank A and Bank C occur. This feature is used primarily in applications where Bank A and Bank C are running at different frequencies, and is particularly useful when they are running at non-integer multiples of one another.