System clock chip generates clock outputs for ATI RS480 systems using AMD K8 processors. The device provides three 14.318 MHz reference clocks, one 48 MHz USB clock, HyperTransport and PCI clock seeds, two AMD K8 differential clock pairs, and eight SRC or PCI Express differential clock pairs. SMBus-compatible control allows clock outputs to be disabled, and programmable clock-request pins control selected SRC outputs. Operation is specified from 0°C to 70°C with a 3.3 V supply tolerance of plus or minus 5 percent. Package options include 56-lead SSOP and 56-lead TSSOP formats.
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| Recommended application | ATI RS480 systems using AMD K8 processors |
| Supply voltage | 3.3 ±5%V |
| Operating temperature | 0 to 70°C |
| Input frequency | 14.31818MHz |
| Reference clock outputs | 3 at 14.318 MHz |
| USB clock output frequency | 48.00MHz |
| HyperTransport clock seed | 66MHz |
| PCI clock seed | 33MHz |
| AMD K8 clock outputs | 2 differential pairs |
| SRC/PCI Express clock outputs | 6 differential pairs |
| ATI G clock outputs | 2 differential SRC/PCI Express pairs |
| Control interface | SMBus, SCLK and SDATA 5 V tolerant |
| Clock request inputs | 2 programmable CLKREQ pins for SRC clocks |
| Operating current | 300 max, all outputs drivenmA |
| SMBus voltage range | 2.7 to 5.5V |
| Spread-spectrum modulation frequency | 30 to 33kHz |
| SRC output differential type | 0.7 V current-mode differential pair |
| IREF resistor | 475 standardohm |
| Storage temperature | -65 to 150°C |
| ESD protection | >1 HBMkV |
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