![]() When the load you're driving goes beyond \$V_\$. ![]() CMOS totem-poles are more symmetrical, and don't suffer from this. So don't use them when you need to both source and sink current. ![]() TTL totem-poles are highly asymmetrical: they can hardly source current, typically 0.4mA versus 16mA when sinking.Always use open collector/open drain drivers for wired AND. ![]() If one output is high and the other low you get a short.
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