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LM393B Datasheet(PDF) 19 Page - Texas Instruments

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Part No. LM393B
Description  LM393B, LM2903B, LM193, LM293, LM393 and LM2903 Dual Comparators
Download  49 Pages
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Maker  TI [Texas Instruments]
Homepage  http://www.ti.com
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LM393B Datasheet(HTML) 19 Page - Texas Instruments

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½ LM2903
VLOGIC
VSUP
Vref
Vin
+
½ LM2903
Vin-
Vin+
Rpullup
Rpullup
VLOGIC
VSUP
C
L
C
L
19
LM393B, LM2903B, LM193, LM293, LM293A, LM393, LM393A, LM2903, LM2903V
www.ti.com
SLCS005AC – OCTOBER 1979 – REVISED FEBRUARY 2020
Product Folder Links: LM393B LM2903B LM193 LM293 LM293A LM393 LM393A LM2903 LM2903V
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Copyright © 1979–2020, Texas Instruments Incorporated
8 Application and Implementation
NOTE
Information in the following applications sections is not part of the TI component
specification, and TI does not warrant its accuracy or completeness. TI’s customers are
responsible for determining suitability of components for their purposes. Customers should
validate and test their design implementation to confirm system functionality.
8.1 Application Information
The device is typically used to compare a single signal to a reference or two signals against each other. Many
users take advantage of the open drain output to drive the comparison logic output to a logic voltage level to an
MCU or logic device. The wide supply range and high voltage capability makes this comaprator optimal for level
shifting to a higher or lower voltage.
8.2 Typical Application
Figure 39. Single-Ended and Differential Comparator Configurations
8.2.1 Design Requirements
For this design example, use the parameters listed in Table 1 as the input parameters.
Table 1. Design Parameters
DESIGN PARAMETER
EXAMPLE VALUE
Input Voltage Range
0 V to Vsup-2 V
Supply Voltage
4.5 V to VCC maximum
Logic Supply Voltage
0 V to VCC maximum
Output Current (RPULLUP)
1 µA to 4 mA
Input Overdrive Voltage
100 mV
Reference Voltage
2.5 V
Load Capacitance (CL)
15 pF
8.2.2 Detailed Design Procedure
When using the device in a general comparator application, determine the following:
Input Voltage Range
Minimum Overdrive Voltage
Output and Drive Current
Response Time
8.2.2.1 Input Voltage Range
When choosing the input voltage range, the input common mode voltage range (VICR) must be taken in to
account. If temperature operation is below 25°C the VICR can range from 0 V to VCC– 2.0 V. This limits the input
voltage range to as high as VCC– 2.0 V and as low as 0 V. Operation outside of this range can yield incorrect
comparisons.


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