LMV331IDBVT datasheet(9/39 Pages) TI1

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IN+

IN−

OUT

GND

VCC+

LMV331, LMV393, LMV339

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SLCS136T – AUGUST 1999 – REVISED JANUARY 2015

8 Detailed Description

8.1 Overview

The LMV331, LMV393 and LMV339 family of comparators have the ability to operate up to 5 V on the supply pin.

This standard device has proven ubiquity and versatility across a wide range of applications. This is due to it's

low Iq and fast response.

The open-drain output allows the user to configure the output's logic low voltage (VOL) and can be utilized to

enable the comparator to be used in AND functionality.

8.2 Functional Block Diagram

8.3 Feature Description

The LMV331, LMV393 and LMV339 consists of a PNP input, whose Vbe creates a limit on the input common

mode voltage capability, allowing LMV33x to accurately function from ground to VCC–Vbe(~700mV) differential

input. This enables much head room for modern day supplies of 3.3 V and 5.0 V.

The output consists of an open drain NPN (pull-down or low side) transistor. The output NPN will sink current

when the positive input voltage is higher than the negative input voltage and the offset voltage. The VOL is

resistive and will scale with the output current. Please see Figure 3 for VOL values with respect to the output

current.

8.4 Device Functional Modes

8.4.1 Voltage Comparison

The LMV33x operates solely as a voltage comparator, comparing the differential voltage between the positive

and negative pins and outputs a logic low or high impedance (logic high with pull-up) based on the input

differential polarity.

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