Frequency timing generator provides four differential output pairs for CPU, QPI, FBD, PCIe Gen 2 and SATA clocking. The device synthesizes common output frequencies from a 14.31818 MHz or 25 MHz crystal, or from an external reference clock. Differential outputs use 0.7 V current-mode signaling with less than 50 ps cycle-to-cycle jitter and less than 35 ps output-to-output skew. Frequency selection is supported through strap pins or SMBus control, and spread-spectrum modes support downspread and centerspread operation.
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| Function | Frequency timing generator |
| Differential output pairs | 4 |
| Differential output type | 0.7 V current-mode |
| Reference output | 1 copy of reference clock |
| Input frequency | 14.31818 or 25MHz |
| Selectable output frequencies | 100, 125, 133.33, 166.67, 200, 266, 333, 400MHz |
| Supply voltage | 3.3 ±5%V |
| Cycle-to-cycle jitter | <50ps |
| Output-to-output skew | <35ps |
| Output frequency accuracy | ±300ppm |
| 100 MHz output frequency accuracy | ±150ppm |
| Spread spectrum modes | 0 to -0.5% downspread; ±0.25% centerspread |
| Modulation frequency | 30 to 33kHz |
| Operating ambient temperature | 0 to 85°C |
| Package pins | 28 |
| Control interface | Strap pins or SMBus |
| RoHS | RoHS compliant packaging available |
These are design resources that include the IDT ICS9FG104
User guide for the MPC8379E-RDB reference design board featuring the NXP PowerQUICC II Pro processor, Gigabit Ethernet switching, SATA, and USB 2.0 in a Mini-ITX form factor.
