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LM393

Dual Differential Comparator

First Components International 

LM393 Dual Differential Comparator

APPLICATIONS INFORMATION

These dual comparators feature high gain, wide bandwidth characteristics. This gives

the device oscillation tendencies if the outputs are capacitively coupled to the inputs via stray

capacitance. This oscillation manifests itself during output transitions (VOL to VOH ). To alleviate

this situation, input resistors <10 kΩ should be used.

The addition of positive feedback (< 10 mV) is also recommended. It is good design

practice to ground all unused pins.

Differential input voltages may be larger than supply voltage without damaging the

comparator’s inputs. Voltages more negative than –0.3 V should not be used.

Zero Crossing Detector

(Single Supply)

Zero Crossing Detector

(Split Supply)

Free-Running Square Wave Oscillator

Time Delay Generator

Comparator With Hysteresis

5-19

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