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TL331, TL331B, TL391B

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SLVS238H – AUGUST 1999 – REVISED MAY 2020

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8.2.2.1 Input Voltage Range

incorrect comparisons.

Below 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

comparator, with the response time decreasing with increasing overdrive. Figure 5 and Figure 6 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/pull-up voltage. The output current will

The output current can also effect the transient response. More is explained in the next section.

8.2.2.4 TL331B & TL391B ESD Protection

The "B" versions add dedicated ESD protections on all the pins for improved ESD performance as well as

improved negative input voltage handling. Please see Application Note SNOAA35 for more information.

8.2.2.5 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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