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LMC7221 Datasheet(PDF) 6 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor. Click here to check the latest version.
Part No. LMC7221
Description  Tiny CMOS Comparator with Rail-To-Rail Input and Open Drain Output
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Maker  NSC [National Semiconductor (TI)]
Homepage  http://www.national.com

LMC7221 Datasheet(HTML) 6 Page - 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
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
By using multiple Tiny Comparators instead of duals or
quads, complex signal routing and possibly crosstalk can be
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-
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
Input Bias Current vs
Common Mode Voltage
Input Bias Current vs
Leakage Current vs
Supply Voltage

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