LM393DGKR datasheet(19/56 Pages) TI2

19 / 56 page

voltage range to as high as VCC– 2.0V and as low as 0V. Operation outside of this range can yield incorrect

comparisons.

The following is a list of input voltage situation and the 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, see Section 2 of Application Design Guidelines for

LM339, LM393, TL331 Family Comparators Including the New B-versions.

7.2.2.2 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 7-2 and Figure 7-3 show

positive and negative response times with respect to overdrive voltage.

7.2.2.3 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. See the

Output Low vs. Sinking Current graphs in the Typical Characteristics, LMx93x and LM2903x section to determine

VOL based on the output current.

The output current can also effect the transient response. See Section 7.2.2.4 for more information.

7.2.2.4 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 Figure 5-20 in the linear region at the desired temperature, or

by dividing the VOL by Iout

www.ti.com

LM393B, LM2903B, LM193, LM293, LM293A, LM393, LM393A, LM2903, LM2903V

SLCS005AH – OCTOBER 1979 – REVISED APRIL 2025

Submit Document Feedback

Product Folder Links: LM393B LM2903B LM193 LM293 LM293A LM393 LM393A LM2903 LM2903V

LM393DGKR 数据表(PDF) 19 Page - Texas Instruments

LM393DGKR 数据表(HTML) 19 Page - Texas Instruments

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56

数据表下载