LMC7221_14 Datasheet, PDF (10/21 Pages) Texas Instruments – LMC7221 Tiny CMOS Comparator with Rail-To-Rail Input and Open Drain Output

LMC7221
SNOS748E – SEPTEMBER 1999 – REVISED MARCH 2013
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Figure 18.
LAYOUT CONSIDERATIONS
The LMC7221 is not an especially fast comparator, so high speed design practices are not required. The
LMC7221 is capable of operating with very high impedance inputs, so precautions should be taken to reduce
noise pickup with high impedance (∼ 100 kΩ and greater) designs and in electrically noisy environments.
Keeping high value resistors close to the LMC7221 and minimizing the size of the input nodes is a good practice.
With multilayer designs, try to avoid long loops which could act as inductors (coils). Sensors which are not close
to the comparator may need twisted pair or shielded connections to reduce noise.
PUSH-PULL OUTPUTS, DUAL VERSIONS
The LMC7211 is a comparator similar to the LMC7221, but with push-pull outputs which can source current.
The performance of the LMC7221 is available in a dual device. Please see the LMC6772 datasheet. For a dual
device with push-pull outputs, please see the LMC6762 datasheet.
Rail-to-Rail Input Low Power Comparators—
LMC7221
LMC6762
LMC7221
LMC6772
Push-Pull Output
5-Pin SOT-23, 8-Pin SOIC
8-Pin SOIC
Open Drain Output
5-Pin SOT-23, 8-Pin SOIC
8-Pin SOIC
Single
Dual
Single
Dual
ADDITIONAL 5-Pin SOT-23 TINY DEVICES
TI has additional parts available in the space saving SOT-23 Tiny package, including amplifiers, voltage
references, and voltage regulators, including the following:
LMC7101
LMC7111
LM7131
LP2980
LM4040
LM4041
LM385
1 MHz gain-bandwidth rail-to-rail input and output amplifier—high input impedance and high gain 700 μA typical
current 2.7V, 3V, 5V and 15V specifications.
Low power 50 kHz gain-bandwidth rail-to-rail input and output amplifier with 25 μA typical current specified at 2.7V,
3.0V, 3.3V, 5V and 10V.
Tiny Video amp with 70 MHz gain bandwidth 3V, 5V and ±5V specifications.
Micropower SOT 50 mA Ultra Low-Dropout Regulator.
Precision micropower shunt voltage reference. Fixed voltages of 2.500V, 4.096V, 5.000V, 8.192V and 10.000V.
Precision micropower shut voltage reference 1.225V and adjustable.
Low current voltage reference. Fixed Voltages of 1.2V and 2.5V.
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