LMV331-N, LMV339-N, LMV393-N

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SNOS018H – AUGUST 1999 – REVISED DECEMBER 2014

7 Detailed Description

7.1 Overview

The LMV331-N/393-N/339-N comparators features a supply voltage range of 2.7 V to 5 V with a low supply

current of 55

μA/channel with propagation delays as low as 200ns. They are avaialble in small, space-saving

packages, which makes these comparators versatile for use in a wide range of applications, from portable to

industrial. The open collector output configuration allows the device to be used in wired-OR configurations, such

as a window comparators.

7.2 Functional Block Diagram

7.3 Feature Description

7.3.1 Open Collector Output

The output of the LMV331-N/393-N/339-N series is the uncommitted collector of a grounded-emitter NPN output

transistor, which requires a pull-up resistor to a positive supply voltage for the output to switch properly. Many

collectors can be tied together to provide an output OR’ing function. An output pull-up resistor can be connected

to any available power supply voltage within the permitted V+ supply voltage range. The output pull-up resistor

should be chosen high enough so as to avoid excessive power dissipation yet low enough to supply enough

drive to switch whatever load circuitry is used on the comparator output. On the LMV331-N/393-N/339-N the pull-

up resistor should range between 1 k to 10 k

Ω.

7.3.2 Ground Sensing Input

The LMV331-N/393-N/339-N has a typical input common mode voltage range of

−0.1V below the ground to 0.8V

below Vcc.

7.4 Device Functional Modes

A basic comparator circuit is used for converting analog signals to a digital output.

The output is HIGH when the voltage on the non-inverting (+IN) input is greater than the inverting (-IN) input.

The output is LOW when the voltage on the non-inverting (+IN) input is less than the inverting (-IN) input.

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Product Folder Links: LMV331-N LMV339-N LMV393-N