LM339LVDR datasheet(19/63 Pages) TI1

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7 Detailed Description

7.1 Overview

The LV Family devices are micro-power comparators with open-drain outputs and improved input offset voltage

that operate down to 1.65 V while only consuming only 25 µA per channel. The LV family are ideally suited

for portable, automotive and industrial applications. An internal power-on reset circuit ensures that the output

remains in a known state during power-up and power-down while fail-safe inputs can tolerate input transients

without damage or false outputs.

7.2 Functional Block Diagram

OUT

IN+

IN-

Bias

Power-On-Reset

(POR)

V+

GND

SNAPBACK

ESD

CLAMPS

GND

Output

Control

GND

V+

7.3 Feature Description

The LV family devices are micro-power comparators that have low input offset voltages and are capable of

operating at low voltages. The LV family feature a rail-to-rail input stage capable of operating up to 100 mV

beyond the power supply rails. The comparators also feature an open-drain output stage options with Power On

Reset for known start-up conditions.

7.4 Device Functional Modes

7.4.1 Open Drain Output

The LV family features an open-drain (also commonly called open collector) sinking-only output stage enabling

the output logic levels to be pulled up to an external voltage from 0 V up to 5.5 V, independent of the comparator

supply voltage (V+). The open-drain output also allows logical OR'ing of multiple open drain outputs and logic

level translation. TI recommends setting the pull-up resistor current to between 100uA and 1mA. Lower pull-up

resistor values will help increase the rising edge risetime, but at the expense of increasing VOL and higher power

dissipation. The risetime will be dependant on the time constant of the total pull-up resistance and total load

capacitance. Large value pull-up resistors (>1 MΩ) will create an exponential rising edge due to the RC time

constant and increase the risetime.

Unused open drain outputs should be left floating, or can be tied to the GND pin if floating pins are not allowed.

While an individual output can typically sink up to 100 mA, the total combined current for all channels must be

less than 200 mA.

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TL331LV, TL391LV, LM393LV, LM339LV

SNOSDA4C – JUNE 2020 – REVISED MARCH 2023

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