LM339 Quad Voltage Comparator

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 (V

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.

APPLICATIONS INFORMATION

Zero Crossing Detector

(Single Supply)

Zero Crossing Detector

(Split Supply)

Square Wave Oscillator

Driving Logic

Inverting Comparator With Hysteresis

Non-Inverting Comparator With Hysteresis