LM393DGKR datasheet(20/55 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. Customers should validate and test their design

implementation to confirm system functionality.

9.1 Application Information

The device is typically used to compare a single signal to a reference or two signals against each other. 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 this comaprator optimal for level

shifting to a higher or lower voltage.

9.2 Typical Application

½ LM2903

VLOGIC

VSUP

Vref

Vin

½ LM2903

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-2 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 device 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 below 25°C the VICR can range from 0 V to VCC– 2.0 V. This limits the input

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

comparisons.

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

SLCS005AD – OCTOBER 1979 – REVISED OCTOBER 2020

www.ti.com

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