LM239DR datasheet(24/51 Pages) TI

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9 Application and Implementation

Note

Information in the following applications sections is not part of the TI component specification,

and TI does not warrant its accuracy or completeness. TI’s customers are responsible for

determining suitability of components for their purposes, as well as validating and testing their design

implementation to confirm system functionality.

9.1 Application Information

Typically, a comparator compares either a single signal to a reference, or to two differnt signals. Many users

take advantage of the open-drain output to drive the comparison logic output to a logic voltage level to an MCU

or logic device. The wide supply range and high voltage capability makes LMx39 or LM2901x optimal for level

shifting to a higher or lower voltage.

9.2 Typical Application

LM2901

VLOGIC

VSUP

Vref

Vin

LM2901

Vin-

Vin+

Rpullup

VLOGIC

VSUP

Figure 9-1. Single-ended and Differential Comparator Configurations

9.2.1 Design Requirements

For this design example, use the parameters listed in Table 9-1 as the input parameters.

Table 9-1. Design Parameters

DESIGN PARAMETER

EXAMPLE VALUE

Input Voltage Range

0 V to Vsup-1.5 V

Supply Voltage

4.5 V to VCC maximum

Logic Supply Voltage

0 V to VCC maximum

Output Current (RPULLUP)

1 µA to 4 mA

Input Overdrive Voltage

100 mV

Reference Voltage

2.5 V

Load Capacitance (CL)

15 pF

9.2.2 Detailed Design Procedure

When using the LMx39 in a general comparator application, determine the following:

• Input voltage range

• Minimum overdrive voltage

• Output and drive current

• Response time

9.2.2.1 Input Voltage Range

When choosing the input voltage range, the input common-mode voltage range (VICR) must be taken in to

account. If temperature operation is above or below 25°C the VICR can range from 0 V to VCC– 2 V. This limits

the input voltage range to as high as VCC– 2 V and as low as 0 V. Operation outside of this range can yield

incorrect comparisons.

LM139, LM239, LM339, LM339B, LM139A, LM239A

LM339A, LM2901B, LM2901, LM2901AV, LM2901V

SLCS006X – OCTOBER 1979 – REVISED OCTOBER 2023

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