LM393DGKR.A datasheet(17/56 Pages) TI2

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6 Detailed Description

6.1 Overview

These dual comparators have the ability to operate up to absolute maximum of 36V (38V for the "B" version) on

the supply pin. This device has proven ubiquity and versatility across a wide range of applications. This is due to

very wide supply voltages range, low Iq and fast response of the devices.

The open-collector outputs allow the user to level shift to the desired logic level indpendent of VCC, while also

enabling AND functionality when multiple outputs are connected together.

6.2 Functional Block Diagram

- Input

Q10

Q11

Q12

+ Input

Output

VCC

Internal

Bias

Itail

Q13

Q14

ESD

VCM

Clamp

Q15

Figure 6-1. Schematic (Each Comparator)

6.3 Feature Description

The comparator consists of a PNP Darlington pair input, allowing the device to operate with very high gain

and fast response with minimal input bias current. The input Darlington pair creates a limit on the input

common mode voltage capability, allowing the comparator to accurately function from ground to VCC– 2V over

temperature. A clamp is added around Q3 to mimic the both inputs above input voltage range behavior of the

original classic silicon.

The output consists of an open drain NPN (pull-down or low side) transistor. The output NPN sinks current when

the negative input voltage is higher than the positive input voltage and the offset voltage. The VOL is resistive

and scales with the output current. Please see the "Output Low Voltage vs. Output Sinking Current" graphs for

VOL values with respect to the output current.

6.4 Device Functional Modes

6.4.1 Voltage Comparison

The device operates solely as a voltage comparator, comparing the differential voltage between the positive and

negative pins and outputting a logic low or high impedance (logic high with pullup) based on the input differential

polarity.

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

SLCS005AH – OCTOBER 1979 – REVISED APRIL 2025

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