LM339X datasheet(23/51 Pages) TI

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8 Detailed Description

8.1 Overview

The LMx39 and LM2901x are quad comparators with the ability to operate up to an absolute maximum of 36 V

on the supply pin. This standard device has proven ubiquity and versatility across a wide range of applications.

This is due to very wide supply voltages range (2 V up to 32 V), low Iq, and fast response of the device.

The open-drain output allows the user to configure the output logic low voltage (VOL) and allows the comparator

to be used in AND functionality.

8.2 Functional Block Diagram

80- A

Current Regulator

80 µA

60 µA

10 µA

VCC

10 µA

OUT

GND

IN+

IN−

Epi-FET

Diodes

Resistors

Transistors

COMPONENT COUNT

Figure 8-1. Schematic (Each Comparator)

8.3 Feature Description

The comparator consists of a PNP Darlington pair input, allowing the device to operate with very high gain

and fast response with minimal input bias current. The input Darlington pair creates a limit on the input common-

mode voltage capability, allowing the comparator to accurately function from ground to (VCC – 1.5 V) differential

input. Allow for (VCC – 2 V) at cold temperature.

The output consists of an open-collector NPN (pulldown or low-side) transistor. The output NPN sinks current

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

resistive and scales with the output current. See the Section 7 section for VOL values with respect to the output

current.

8.4 Device Functional Modes

8.4.1 Voltage Comparison

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

and negative pins and outputting a logic low or high impedance (logic high with pullup) based on the input

differential polarity.

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LM139, LM239, LM339, LM339B, LM139A, LM239A

LM339A, LM2901B, LM2901, LM2901AV, LM2901V

SLCS006X – OCTOBER 1979 – REVISED OCTOBER 2023

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Product Folder Links: LM139 LM239 LM339 LM339B LM139A LM239A LM339A LM2901B LM2901 LM2901AV LM2901V

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