Hi Danilo,
Yes, adding a series resistor will reduce output drive strength, and yes, that is the primary electrical difference between the two parts. The reduced drive strength will also impact propagation delay.
Here are a few of the differences:
You…
That depends on what characteristics you need, especially drive strength. Some possible alternatives are SN74AHC245-EP, SN74AC245-EP, or SN74ABT245B-EP.
1. See figures 13, 17, 18, and 20 in the Advanced Schottky Family application report.
2. There are no internal pull-ups or -downs. An AS input is the base of a PNP transistor, so an open input will be read as high. (But an open input might easily pick…