80- A

µ

Current Regulator

80 µA

60 µA

10 µA

VCC

10 µA

OUT

GND

IN+

IN−

Epi-FET

Diodes

Resistors

Transistors

COMPONENT COUNT

1

2

2

30

LM139, LM239, LM339, LM139A

LM239A, LM339A, LM2901, LM2901AV, LM2901V

SLCS006T – OCTOBER 1979 – REVISED JUNE 2015

www.ti.com

8 Detailed Description

8.1 Overview

The LMx39 is a dual comparator with the ability to operate up to 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 to 36 V), low Iq, and fast response of the device.

This device is Q100 qualified and can operate over a wide temperature range (–40°C to 125°C).

to be used in AND functionality.

8.2 Functional Block Diagram

Figure 6. Schematic (Each Comparator)

8.3 Feature Description

LMx39 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

enables much head room for modern day supplies of 3.3 V and 5 V.

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

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

current.

8.4 Device Functional Modes

8.4.1 Voltage Comparison

The LMx39 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.

10

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