LM193-N, LM2903-N, LM293-N, LM393-N

SNOSBJ6F – OCTOBER 1999 – REVISED DECEMBER 2014

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8 Detailed Description

8.1 Overview

comparators in a single package. The low power consumption of 0.4mA at 5V and the 2.0V supply operation

makes the LM139 suitable for battery powered applications.

8.2 Functional Block Diagram

Figure 11. Basic Comparator

8.3 Feature Description

The input bias current of 25 nA enables the LM193 to use even very high impedance nodes as inputs. The

differential voltage input range equals the supply voltage range.

The LM193 can be operated with a single supply, where V+ can be from 2.0 V to 36 V, or in a dual supply

voltage configuration, where GND pin is used as a V– supply. The supply current draws only 0.4 mA for both

comparators.

The output of each comparator in the LM193 is the open collector of a grounded-emitter NPN output transistor

which can typically draw up to 16mA.

8.4 Device Functional Modes

A basic comparator circuit is used for converting analog signals to a digital output. The output is HIGH when the

voltage on the non-inverting (+IN) input is greater than the inverting (-IN) input. The output is LOW when the

voltage on the non-inverting (+IN) input is less than the inverting (-IN) input. The inverting input (-IN) is also

commonly referred to as the "reference" or "VREF" input. All pins of any unused comparators should be tied to

the negative supply.

10

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