LM393D datasheet(19/50 Pages) TI

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8 Detailed Description

8.1 Overview

These dual comparators have the ability to operate up to absolute maximum of 36 V (38 V 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-drain output allows the user to configure the output's logic high voltage (VOH) and can be used to

enable the comparator to be used in AND functionality.

8.2 Functional Block Diagram

80- A

Current Regulator

80 µA

60 µA

10 µA

VCC

10 µA

OUT

GND

IN+

IN−

Epi-FET

Diodes

Resistors

Transistors

COMPONENT COUNT

Figure 8-1. Schematic (Each Comparator)

8.3 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– 1.5 V input. Allow

for VCC– 2 V at cold temperature.

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. See Figure 7-3 for VOL values with respect to the output current.

8.4 Device Functional Modes

8.4.1 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

SLCS005AD – OCTOBER 1979 – REVISED OCTOBER 2020

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

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