OL

CE

OUT

V

R

I

=

N

CE

L

R

C

t

@

´

P

PULLUP

L

R

C

t

@

´

LM139, LM239, LM339, LM139A

LM239A, LM339A, LM2901, LM2901AV, LM2901V

SLCS006T – OCTOBER 1979 – REVISED JUNE 2015

www.ti.com

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

9.2.2.2 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 8 and Figure 9 show positive

and negative response times with respect to overdrive voltage.

9.2.2.3 Output and Drive Current

Output current is determined by the load and pullup resistance and logic and pullup voltage. The output current

The output current can also effect the transient response.

9.2.2.4 Response Time

determine the transient response. Equation 1 approximates the positive response time. Equation 2 approximates

the negative response time. Equation 3 calculates the collector-emitter resistance.

(1)

(2)

where

•

•

(3)

12

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