4

LMV331TP / LMV393TP

General Purpose, 1.8V, RRI, Open-Drain Output Comparators

REV1.4

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Pin Functions

–IN: Inverting Input of the Comparator. Voltage

+IN: Non-Inverting Input of Comparator. This pin has

the same voltage range as –IN.

NC: No Connection.

voltage is from 1.8V to 5.5V. Split supplies are

possible as long as the voltage between V+ and V–

is between 1.8V and 5.5V. 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.

ground. It can also be tied to a voltage other than

from 1.8V to 5.5V. If it is not connected to ground,

bypass it with a capacitor of 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 LMV331-393 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 LMV331-393 comparators use 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.

-2

0

2

4

6

Time (100μs/div)

Input Voltage

Output Voltage

Figure 1. Comparator Response to Input Voltage

The electrostatic discharge (ESD) protection input structure of two back-to-back diodes and 1kΩ series resistors

are used to limit the differential input voltage applied to the precision input of the comparator by clamping input

voltages that exceed supply voltages, as shown in Figure 2. Large differential voltages exceeding the supply

voltage should be avoided to prevent damage to the input stage.