What is the meaning of "Effective logic inversion"?

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Effective logic inversion refers to the relationship between TTL IC outputs and the LED loads they drive, where TTL outputs are more effective as current sinking rather than sourcing. This means that for optimal LED operation, the LED should be connected to +5 volts on one end and to a TTL current sinking output on the other. The term "inversion" highlights that the LED is activated when the TTL output is low, making it an "active low" configuration. Understanding this concept is crucial for students working with TTL circuits and LED applications. Overall, effective logic inversion is key to ensuring proper LED functionality in TTL logic systems.
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What is the mean of " Effective logic inversion " ?
Because I can't understand this qustion,

" Describe briefly why there is an Effective logic inversion between logic level from a TTL IC and the LED load it drives? "
 
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Hello aspiralanka-
One conceptual problem some students have with understanding TTL is that outputs are better as current sinking outputs than as current sourcing outputs. So driving a LED is better done by tying one end of the LED to +5 volts and the other to a TTL current sinking output.
Bob S
 
... and the "inversion" in your question refers to the fact that the drive of the LED is "active low". That is, the output of the gate is low (for the reason that Bob mentioned) to turn ON the LED.
 

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