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All inputs are TTL compatible.
Now, this is "close" to TTL I see on the graph, but not sure if it is close enough (if the "source" is PIC running on 3V)?recommended operating conditions:
Logic supply voltage: min=4.5V, max=7V
High level input voltage, Vih=2.3 - 7V
Low-level input voltage, Vil -0.3 - 1.5V