VOH and VOL are the voltages you get when the device sets its output to High or Low. VIH and VIL are the voltages the device expects to interpret the value as a 1 or a 0.
For VDD_ext = 3V, you should ideally be using a PIC that can operate at 3V.
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VOH and VOL are the voltages you get when the device sets its output to High or Low. VIH and VIL are the voltages the device expects to interpret the value as a 1 or a 0.
For VDD_ext = 3V, you should ideally be using a PIC that can operate at 3V.
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