LMC7221AIM datasheet(6/12 Pages) NSC

Part #	LMC7221AIM

Description	Tiny CMOS Comparator with Rail-To-Rail Input and Open Drain Output

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Manufacturer	NSC [National Semiconductor (TI)]

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Typical Performance Characteristics (Continued)

Application Information

1.0 Benefits of the LMC7221 Tiny Comparator

Size. The small footprint of the SOT 23-5 packaged Tiny

Comparator, (0.120 x 0.118 inches, 3.05 x 3.00 mm) saves

space on printed circuit boards, and enable the design of

smaller electronic products. Because they are easier to

carry, many customers prefer smaller and lighter products.

Height. The height (0.056 inches, 1.43 mm) of the Tiny

Comparator makes it possible to use it in PCMCIA type III

cards.

Simplified Board Layout. The Tiny Comparator can sim-

plify board layout in several ways. First, by placing a com-

parator where comparators are needed, instead of routing

signals to a dual or quad device, long pc traces may be

avoided.

By using multiple Tiny Comparators instead of duals or

quads, complex signal routing and possibly crosstalk can be

reduced.

Low Supply Current. The typical 7 µA supply current of the

LMC7221 extends battery life in portable applications, and

may allow the reduction of the size of batteries in some ap-

plications.

Wide Voltage Range. The LMC7221 is characterized at

15V, 5V and 2.7V. Performance data is provided at these

popular voltages. This wide voltage range makes the

LMC7221 a good choice for devices where the voltage may

vary over the life of the batteries.

Digital Outputs Representing Signal Level. Comparators

provide a high or low digital output depending on the voltage

levels of the (+) and (−) inputs. This makes comparators use-

ful for interfacing analog signals to microprocessors and

other digital circuits. The LMC7221 can be thought of as a

one-bit a/d converter.

Open Drain Output. The open drain output is like the open

collector output of a logic gate. This makes the LMC7221

very useful for mixed voltage systems.

Driving LEDs (Light Emitting Diodes). With a 5 volt power

supply, the LMC7221’s output sinking current can drive

small, high efficiency LEDs for indicator and test point cir-

cuits. The small size of the Tiny package makes it easy to

find space to add this feature to even compact designs.

Input range to Beyond Rail to Rail. The input common

mode range of the LMC7221 is slightly larger than the actual

power supply range. This wide input range means that the

comparator can be used to sense signals close to the power

supply rails. This wide input range can make design easier

by eliminating voltage dividers, amplifiers, and other front

end circuits previously used to match signals to the limited

input range of earlier comparators. This is useful to power

supply monitoring circuits which need to sense their own

power supply, and compare it to a reference voltage which is

close to the power supply voltage. The wide input range can

also be useful for sensing the voltage drop across a current

sense resistor for battery chargers.

Input Bias Current vs

Common Mode Voltage

DS012346-12

Input Bias Current vs

Common Mode Voltage

DS012346-13

Input Bias Current vs

Temperature

DS012346-14

Leakage Current vs

Supply Voltage

DS012346-15

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6

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LMC7221AIM Datasheet(PDF) 6 Page - National Semiconductor (TI)

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