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LM393B Datasheet(PDF) 18 Page - Texas Instruments

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Part No. LM393B
Description  LM393B, LM2903B, LM193, LM293, LM393 and LM2903 Dual Comparators
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Maker  TI [Texas Instruments]
Homepage  http://www.ti.com
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LM393B Datasheet(HTML) 18 Page - Texas Instruments

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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
18
LM393B, LM2903B, LM193, LM293, LM293A, LM393, LM393A, LM2903, LM2903V
SLCS005AC – OCTOBER 1979 – REVISED FEBRUARY 2020
www.ti.com
Product Folder Links: LM393B LM2903B LM193 LM293 LM293A LM393 LM393A LM2903 LM2903V
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Copyright © 1979–2020, 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.
The open-drain output allows the user to configure the output's logic high voltage (VOH) and can be used to
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
mode voltage capability, allowing the comparator to accurately function from ground to VCC– 1.5 V input. Allow
for VCC– 2 V at cold temperature.
The output consists of an open drain NPN (pull-down 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 Figure 3 for VOL values with respect to the output current.
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.


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