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LM193-MIL

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SLIS183 – JUNE 2017

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8.2.2 Detailed Design Procedure

When using the device in a general comparator application, determine the following:

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Input Voltage Range

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Minimum Overdrive Voltage

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Output and Drive Current

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Response Time

8.2.2.1 Input Voltage Range

comparisons.

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

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/pull-up resistance and logic/pullup voltage. The output current will

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

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