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LM555: Trigger & Threshold Pin functions

Part Number: LM555

Tool/software:

Hello E2E Experts,

Good day.

 While reading datasheet of lm555. they gave pin description of Trigger & Threshold like this,

Trigger- Responsible for ! transition of the flip-flop from set to reset !. The output of the timer depends I on the amplitude of the external trigger pulse applied to this pin.Threshold-Compares the voltage applied to the terminal with a reference voltage of 2/3 Vcc. The I amplitude of voltage applied to this terminal is ! responsible for the set state of the flip-flop! .

In what aspect they are mentioning "Responsible for transition of the flip-flop from set to reset" for trigger & " responsible for the set state of the flip-flop " for threshold. Need some clarity on these words.

As of now my understanding is because of the manufacturing design trigger performs "Responsible for transition of the flip-flop from set to reset" for trigger . Like this similar to threshold for above quotes.

My another guess is flipflop " set " is connected with inverter and then connected with output. 

Regardless of my understanding ,guess is right or wrong, i need clarity on the datasheet mentioned pin functions. Thank you.

Regards,

TICSC