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

19

LM193, LM293, LM293A, LM393, LM393A, LM2903, LM2903V, LM393B, LM2903B

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SLCS005AB – OCTOBER 1979 – REVISED DECEMBER 2019

Product Folder Links: LM193 LM293 LM293A LM393 LM393A LM2903 LM2903V LM393B LM2903B

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Copyright © 1979–2019, Texas Instruments Incorporated

7 Detailed Description

7.1 Overview

These dual comparators have the ability to operate up to absolute maximum of 36 V (38 V for the "B" version) on

the supply pin. This device has proven ubiquity and versatility across a wide range of applications. This is due to

very wide supply voltages range, low Iq and fast response of the devices.

enable the comparator to be used in AND functionality.

7.2 Functional Block Diagram

Figure 38. Schematic (Each Comparator)

7.3 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

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

7.4 Device Functional Modes

7.4.1 Voltage Comparison

The device 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.