Comparator-latch

  
The primary advantage of this circuit, when compared to other comparators, is its ability to latch after the input has reached a predetermined threshold level. When the input exceeds the threshold level, the LM311N output increases. This transition enables the strobe input, preventing the output from falling low. A high-level voltage on the reset input will tum off Q1, thereby removing the supply voltage from the open collector output of the LM311N.
Comparator-latch - schematic

With no supply to the strobe input, the latch condition is removed and the output is again allowed to follow the input excursions. The LM311N will operate with a wide variety of supply voltage levels, ranging from dual ± 15 V to a single 5 V level that provides compatibility with digital IC logic. If more than one latch is used with a common reset, all the pull-up resistors may be connected to Q1"s collector.




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