LAN8670/1/2

7.7.2 RMII Clock Source - 50 MHz Oscillator

In RMII mode, a 50 MHz single-ended clock oscillator input with a nominal 1.8-3.3V clock signal must be driven onto REFCLKIN. This clock must meet the requirements in the following table.

Table 7-22. RMII REFCLKIN Timing Requirements
Parameter	Min	Typ	Max	Units	Notes
REFCLKIN frequency		50		MHz
REFCLKIN Frequency Stability			±100	ppm	Including aging
REFCLKIN Duty Cycle	45		55	%
REFCLKIN Jitter			840	ps	peak-to-peak (not RMS)

Note: On the LAN8670, XTO should be left unconnected and REFCLKIN (XTI) driven with a nominal 1.8-3.3V clock signal.

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