LM393DGKR datasheet(11/25 Pages) TI1

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LM193, LM293, LM293A, LM393, LM393A, LM2903, LM2903V

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SLCS005Y – OCTOBER 1979 – REVISED JUNE 2015

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). In order 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 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

produce a output low voltage (VOL) from the comparator. In which VOL is proportional to the output current. Use

Typical Characteristics 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

The transient response can be determined by the load capacitance (CL), load/pullup resistance (RPULLUP) and

equivalent collector-emitter resistance (RCE).

•

The positive response time (

τp) is approximately τP ~ RPULLUP × CL

•

The negative response time (

τN) is approximately τN ~ RCE × CL

–

RCE can be determine by taking the slope of Typical Characteristics in it's linear region at the desired

temperature, or by dividing the VOL by Iout

8.2.3 Application Curves

The following curves were generated with 5 V on VCC and VLogic, RPULLUP = 5.1 kΩ, and 50 pF scope probe.

Figure 8. Response Time for Various Overdrives

Figure 9. Response Time for Various Overdrives

(Positive Transition)

(Negative Transition)

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