Arduino Mega & TTL 74LS


Can I interface a TTL 74LS chip (like the 74LS04) directly with the digital I/O ports of the Arduino Mega 2560? Does the Arduino Mega allow the 5V level without getting any damage?



Yes you can

So there is no need for a voltage converter, or anything? Just hook up the 74LS.. chips on a breadboard, and connect their pins with the digital I/O pins of the Mega?

Correct - no conversion required.