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Rev. B.2

LM393/LM339

36V Low Power Dual/Quad Differential Comparators

Response Time Test Circuit

Pin Functions

+IN: Non-Inverting Input of Comparator. This pin has the same voltage range as –IN.

voltage between V+ and V– is between 2V and 36V. A bypass capacitor of 0.1μF as close to the part as possible

should be used between power supply pins or between supply pins and ground.

0.1μF as close to the part as possible.

OUT: Comparator Output. The voltage range extends to within millivolts of each supply rail.

Operation

The LM393/339 family single-supply comparators feature internal hysteresis, high speed, and low power. Input signal

range extends beyond the negative and positive power supplies. The output can even extend all the way to the

negative supply. The input stage is active over different ranges of common mode input voltage. Rail-to-rail input

voltage range and low-voltage single-supply operation make these devices ideal for portable equipment.

Applications Information

Inputs

The LM393/339 comparator family uses CMOS transistors at the input which prevent phase inversion when the input

pins exceed the supply voltages. Figure 1 shows an input voltage exceeding both supplies with no resulting phase

inversion.