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LM139A-MIL датащи(PDF) 9 Page - Texas Instruments

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номер детали LM139A-MIL
подробное описание детали  Quad Differential Comparators
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The following list describes the outcomes of some input voltage situations.
When both IN– and IN+ are both within the common-mode range:
If IN– is higher than IN+ and the offset voltage, the output is low and the output transistor is sinking
current
If IN– is lower than IN+ and the offset voltage, the output is high impedance and the output transistor is
not conducting
When IN– is higher than common mode and IN+ is within common mode, the output is low and the output
transistor is sinking current
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
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) must 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 8 and Figure 9 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 and pullup resistance and logic and pullup voltage. The output current
produces a low-level output voltage (VOL) from the comparator, where VOL is proportional to the output current.
The output current can also effect the transient response.
8.2.2.4 Response Time
Response time is a function of input over-drive. See the Typical Characteristics graphs for typical response
times. The rise and fall times can be determined by the load capacitance (CL), load/pull-up 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 determined by taking the slope of Figure 3 in its linear region at the desired temperature, or by
dividing the VOL by IOUT


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