Other Parts Discussed in Thread: DP83822IF
Tool/software:
Hi Team,
The XI clock input does not meet the VIH spec in the Electrical Characteristics(section 6.5) of the datasheet.
The spec is VIH,min=1.4V, however, measurement value is 1.4V and no margin.
The XI-pin is connected according to the circuit recommended in the data sheet(section 8.2.1.2); Clock source=3.3V 25MHz OSC, CD1 and CD2=27pF
The first reply of the following E2E post says that "The oscillator input is in the VDDIO domain.."
In that case, VIH,min=0.7 * 1.8(VDDIO)=1.26V, which meets the spec.
However, this E2E post is for the DP83822IF, not the DP83867IR.
DP83822IF: What kind of signal level is required for XI input when crystal oscillator is used for reference clock? - Interface forum - Interface - TI E2E support forums
https://e2e.ti.com/support/interface-group/interface/f/interface-forum/1057368/dp83822if-what-kind-of-signal-level-is-required-for-xi-input-when-crystal-oscillator-is-used-for-reference-clock
Currently, A problem is not happened in actual operation.
Is it okay if it meets VIH,min=0.7 * 1.8V(VDDIO)=1.26V?
Is it mandatory to meet VIH of XI, min 1.4V?
Best Regard,
