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LM393B Datasheet(PDF) 20 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) 20 Page - Texas Instruments

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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
The following is a list of input voltage situation and their outcomes:
1. When both IN- and IN+ are both within the common-mode range:
a. If IN- is higher than IN+ and the offset voltage, the output is low and the output transistor is sinking
current
b. If IN- is lower than IN+ and the offset voltage, the output is high impedance and the output transistor is
not conducting
2. When IN- is higher than common-mode and IN+ is within common-mode, the output is low and the output
transistor is sinking current
3. When IN+ is higher than common-mode and IN- is within common-mode, the output is high impedance and
the output transistor is not conducting
4. When IN- and IN+ are both higher than common-mode, the output is low and the output transistor is sinking
current
8.2.2.2 Minimum Overdrive Voltage
Overdrive Voltage is the differential voltage produced between the positive and negative inputs of the comparator
over the offset voltage (VIO). To make an accurate comparison the Overdrive Voltage (VOD) should be higher
than the input offset voltage (VIO). Overdrive voltage can also determine the response time of the comparator,
with the response time decreasing with increasing overdrive. Figure 40 and Figure 41 show positive and negative
response times with respect to overdrive voltage.
8.2.2.3 Output and Drive Current
Output current is determined by the load/pull-up resistance and logic/pullup voltage. The output current produces
a output low voltage (VOL) from the comparator. In which VOL is proportional to the output current. Use Typical
Characteristics, LMx93, LM2903 (all 'V' and 'A' suffixes) to determine VOL based on the output current.
The output current can also effect the transient response. See Response Time for more information.
8.2.2.4 Response Time
Response time is a function of input over drive. See Application Curves for typical response times. The rise and
falls times can be determined by the load capacitance (CL), load/pullup resistance (RPULLUP) and equivalent
collector-emitter resistance (RCE).
The rise time (τR) is approximately τR ~ RPULLUP × CL
The fall time (τF) is approximately τF ~ RCE × CL
RCE can be determine by taking the slope of Typical Characteristics, LMx93, LM2903 (all 'V' and 'A'
suffixes) in its linear region at the desired temperature, or by dividing the VOL by Iout


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