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[[File:Tek m94 integration detection.png|600px]] | [[File:Tek m94 integration detection.png|600px]] | ||
---- | ---- | ||
Q36, Q37, Q38, and Q39 form an RS flip-flop. | |||
When input overload is detected, Q32 turns on, supplying current to the base of Q36. | |||
The collector voltage of Q36 and Q37 goes to around 0 V. | |||
The pin 13 "MODE INPUT" pin is normally grounded (e.g., in the [[485]]. | |||
In this state, Q38 and Q39 are cut off and their collectors are pulled up by R38. | |||
That causes a current to flow through R53, into the base of Q37, | |||
which keeps the collectors of Q36 and Q37 close to ground potential. | |||
So, once an overload condition is detected, the flip flop stays in the | |||
left-side-active state even after the input is removed. | |||
==Used in== | ==Used in== | ||