7.7.1.2 Oscillator Clock Source - 25 MHz Oscillator
In MII/SC-MII mode, a 25 MHz single-ended clock oscillator input with a nominal 1.8V or 3.3V clock signal may be driven onto XTI instead of using a crystal resonator. This clock must meet the requirements in the following table.
Note: When operating the MII/SC-MII interface with an
oscillator clock source, only industrial grade Ambient Operating Temperatures (TA
-40°C to +85°C) are guaranteed, refer to the Operating Conditions section.
| Parameter | Min | Typ | Max | Units | Notes |
|---|---|---|---|---|---|
| XTI frequency | 25 | MHz | |||
| XTI Frequency Stability | ±100 | ppm | Including aging | ||
| XTI Duty Cycle | 45 | 55 | % | ||
| XTI Jitter | 840 | ps | peak-to-peak (not RMS) | ||
| XTI rise/fall time | 1.5 | ns |
Note: The XTO pin must be left unconnected and XTI driven with a nominal
1.8-3.3V clock signal.