843801AG-24LF - INTEGRATED DEVICE TECHNOLOGY

LMC7215/LMC7225

Micro-Power, Rail-to-Rail CMOS Comparators with

Push-Pull/Open-Drain Outputs and TinyPak™Package

General Description

The LMC7215/LMC7225 are ultra low power comparators

with a maximum of 1 µA power supply current. They are

designed to operate over a wide range of supply voltages,

from 2V to 8V.

The LMC7215/LMC7225 have a greater than rail-to-rail com-

mon mode voltage range. This is a real advantage in single

supply applications.

The LMC7215 features a push-pull output stage. This fea-

ture allows operation with absolute minimum amount of

power consumption when driving any load.

The LMC7225 features an open drain output. By connecting

an external resistor, the output of the comparator can be

used as a level shifter to any desired voltage to as high as

15V.

The LMC7215/LMC7225 are designed for systems where

low power consumption is the critical parameter.

Guaranteed operation over the full supply voltage range of

2.7V to 5V and rail-to-rail performance makes this compara-

tor ideal for battery-powered applications.

Features

(Typical unless otherwise noted)

nUltra low power consumption 0.7 µA

nWide range of supply voltages 2V to 8V

nInput common-mode range beyond V

and V

−

nOpen collector and push-pull output

nHigh output current drive: (@V

= 5V) 45 mA

nPropagation delay (@V

= 5V, 10 mV overdrive) 25 µs

nTiny 5-Pin SOT23 package

nLatch-up resistance >300 mA

Applications

nLaptop computers

nMobile phones

nMetering systems

nHand-held electronics

nRC timers

nAlarm and monitoring circuits

nWindow comparators, multivibrators

Connection Diagrams

8-Pin SOIC

01285301

Top View

5-Pin SOT23

01285302

Top View

TinyPak™is a trademark of National Semiconductor Corporation.

September 2006

LMC7215/LMC7225 Micro-Power, Rail-to-Rail CMOS Comparators with Push-Pull/Open-Drain

Outputs and TinyPak Package

Absolute Maximum Ratings (Note 1)

If Military/Aerospace specified devices are required,

please contact the National Semiconductor Sales Office/

Distributors for availability and specifications.

ESD Tolerance (Note 2) 2 kV

Differential Input Voltage V

+0.3V, V

−

−0.3V

Voltage at Input/Output Pin V

+0.3V, V

−

−0.3V

Supply Voltage (V

–V

−

) 10V

Current at Input Pin ±5mA

Current at Output Pin (Note 3) ±30 mA

Current at Power Supply Pin 40 mA

Lead Temperature

(soldering, 10 sec) 260˚C

Storage Temperature Range −65˚C to +150˚C

Junction Temperature (Note 4) 150˚C

Operating Ratings(Note 1)

Supply Voltage 2V ≤V

≤8V

Temperature Range(Note 4)

LMC7215IM, LMC7225IM −40˚C to +85˚C

Package Thermal Resistance (θ

)

8-Pin SOIC 165˚C/W

5-Pin SOT23 325˚C/W

2.7V to 5V Electrical Characteristics

Unless otherwise specified, all limits guaranteed for T

= 25˚C, V

= 2.7V to 5V, V

−

= 0V, V

/2. Boldface limits

apply at the temperature extremes.

Typ LMC7215 LMC7225

Symbol Parameter Conditions (Note 5) Limit Limit Units

(Note 6) (Note 6)

Input Offset Voltage 1 6 6 mV

88max

TCV

Input Offset Voltage 2 µV/˚C

Average Drift

Input Current 5 fA

Input Offset Current 1 fA

CMRR Common Mode (Note 7) 80 60 60 dB

Rejection Ratio min

PSRR Power Supply V

= 2.2V to 8V 90 60 60 dB

Rejection Ratio min

Voltage Gain 140 dB

CMVR Input Common-Mode V

= 2.7V 3.0 2.9 2.9 V

Voltage Range CMRR >50 dB 2.7 2.7 min

= 2.7V −0.2 0.0 0.0 V

CMRR >50 dB 0.2 0.2 max

= 5.0V 5.3 5.2 5.2 V

CMRR >50 dB 5.0 5.0 min

= 5.0V −0.3 −0.2 −0.2 V

CMRR >50 dB 0.0 0.0 max

Output Voltage High V

= 2.2V 2.05 1.8 NA V

= 1.5 mA 1.7 min

= 2.7V 2.05 2.3 NA V

= 2.0 mA 2.2 min

= 5.0V 4.8 4.6 NA V

= 4.0 mA 4.5 min

Output Voltage Low V

= 2.2V 0.17 0.4 0.4 V

= 1.5 mA 0.5 0.5 max

= 2.7V 0.17 0.4 0.4 V

= 2.0 mA 0.5 0.5 max

= 5.0V 0.2 0.4 0.4 V

= 4.0 mA 0.5 0.5 max

SC+

Output Short Circuit V

= 2.7V, Sourcing 15 NA mA

LMC7215/LMC7225

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2.7V to 5V Electrical Characteristics (Continued)

Unless otherwise specified, all limits guaranteed for T

= 25˚C, V

= 2.7V to 5V, V

−

= 0V, V

/2. Boldface limits

apply at the temperature extremes.

Typ LMC7215 LMC7225

Symbol Parameter Conditions (Note 5) Limit Limit Units

(Note 6) (Note 6)

Current (Note 10) V

= 5.0V, Sourcing 50 NA mA

SC−

Output Short Circuit V

= 2.7V, Sinking 12 mA

Current (Note 10) V

= 5.0V, Sinking 30 mA

Leakage

Output Leakage Current V

= 2.2V nA

+ = 0.1V, V

− = 0V, 0.01 NA 500 max

OUT

= 15V

Supply Current V

= 5.0V 0.7 1 1 µA

+ = 5V, V

−=0V 1.2 1.2 max

AC Electrical Characteristics

Unless otherwise specified, T

= 25˚C, V

= 5V, V

−

= 0V, V

LMC7215 LMC7225

Symbol Parameter Conditions Typ Typ Units

(Note 5) (Notes 5, 8)

rise

Rise Time Overdrive = 10 mV (Note 8) 1 12.2 µs

fall

Fall Time Overdrive = 10 mV (Note 8) 0.4 0.35 µs

PHL

Propagation Delay (Notes 8, 9) Overdrive = 10 mV 24 24 µs

(High to Low) Overdrive = 100 mV 12 12

= 2.7V Overdrive = 10 mV 17 17 µs

(Notes 8, 9) Overdrive = 100 mV 11 11

PLH

Propagation Delay (Notes 8, 9) Overdrive = 10 mV 24 29 µs

(Low to High) Overdrive = 100 mV 12 17

= 2.7V Overdrive = 10 mV 17 22 µs

(Notes 8, 9) Overdrive = 100 mV 11 16

Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is

intended to be functional, but specific performance is not guaranteed. For guaranteed specifications and the test conditions, see the Electrical Characteristics.

Note 2: Human Body Model, applicable std. MIL-STD-883, Method 3015.7. Machine Model, applicable std. JESD22-A115-A (ESD MM std. of JEDEC)

Field-Induced Charge-Device Model, applicable std. JESD22-C101-C (ESD FICDM std. of JEDEC).

Note 3: Applies to both single-supply and split-supply operation. Continuous short circuit operation at elevated ambient temperature can result in exceeding the

maximum allowed junction temperature of 150˚C.

Note 4: The maximum power dissipation is a function of TJ(MAX),θJA, and TA. The maximum allowable power dissipation at any ambient temperature is

PD=(T

J(MAX) −T

A)/θJA. All numbers apply for packages soldered directly into a PC board.

Note 5: Typical values represent the most likely parametric norm as determined at the time of characterization. Actual typical values may vary over time and will

also depend on the application and configuration. The typical values are not tested and are not guaranteed on shipped production material.

Note 6: All limits are guaranteed by testing or statistical analysis.

Note 7: CMRR measured at VCM = 0V to 2.5V and 2.5V to 5V when VS=5V,V

CM = 0.2V to 1.35V and 1.35V to 2.7V when VS= 2.7V. This eliminates units that

have large VOS at the VCM extremes and low or opposite VOS at VCM =V

S/2.

Note 8: All measurements made at 10 kHz. A 100 kΩpull-up resistor was used when measuring the LMC7225. CLOAD = 50 pF including the test jig and scope

probe. The rise times of the LMC7225 are a function of the R-C time constant.

Note 9: Input step voltage for the propagation measurements is 100 mV.

Note 10: Do not short the output of the LMC7225 to voltages greater than 10V or damage may occur.

LMC7215/LMC7225

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Typical Performance Characteristics T

= 25˚C unless otherwise specified

Supply Current vs. Supply Voltage Prop Delay vs. V

SUPPLY

01285303 01285312

Prop Delay vs. Overdrive Short Circuit Current vs. V

SUPPLY

01285313 01285314

Output Voltage vs. Output Current

LMC7215 Output Voltage vs. Output Current

01285315 01285316

LMC7215/LMC7225

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Typical Performance Characteristics T

= 25˚C unless otherwise specified (Continued)

Output Voltage vs. Output Current

LMC7215 Output Voltage vs. Output Current

01285317 01285318

Output Leakage Current vs. Output Voltage

LMC7225

Output Leakage Current vs. Output Voltage

LMC7225

01285319 01285320

LMC7215/LMC7225

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Application Information

RESPONSE TIME

Depending upon the amount of overdrive, the delay will

typically be between 10 µs to 200 µs. The curve showing

delay vs. overdrive in the “Typical Characteristics” section

shows the delay time when the input is preset with 100 mV

across the inputs and then is driven the other way by 1 mV

to 500 mV.

The transition from high to low or low to high is fast. Typically

1 µs rise and 400 ns fall.

With a small signal input, the comparators will provide a

square wave output from sine wave inputs at frequencies as

high as 25 kHz. Figure 1 shows a worst case example where

a±5 mV sine wave is applied to the input. Note that the

output is delayed by almost 180˚.

NOISE

Most comparators have rather low gain. This allows the

output to spend time between high and low when the input

signal changes slowly. The result is the output may oscillate

between high and low when the differential input is near

zero.

The exceptionally high gain of these comparators, 10,000

V/mV, eliminates this problem. Less then 1 µV of change on

the input will drive the output from one rail to the other rail.

If the input signal is noisy, the output cannot ignore the noise

unless some hysteresis is provided by positive feedback.

INPUT VOLTAGE RANGE

The LMC7215/25 have input voltage ranges that are larger

than the supply voltage guarantees that signals from other

parts of the system cannot overdrive the inputs. This allows

sensing supply current by connecting one input directly to

the V

line and the other to the other side of a current sense

resistor. The same is true if the sense resistor is in the

ground return line.

Sensing supply voltage is also easy by connecting one input

directly to the supply.

The inputs of these comparators are protected by diodes to

both supplies. This protects the inputs from both ESD as well

as signals that greatly exceed the supply voltages. As a

result, current will flow through these forward biased diodes

whenever the input voltage is more than a few hundred

millivolts larger than the supplies. Until this occurs, there is

essentially no input current. As a result, placing a large

resistor in series with any input that may be exposed to large

voltages, will limit the input current but have no other notice-

able effect.

If the input current is limited to less than 5 mA by a series

resistor, (see Figure 2), a threshold or zero crossing detec-

tor, that works with inputs from as low as a few millivolts to as

high as 5,000V, is made with only one resistor and the

comparator.

INPUTS

As mentioned above, these comparators have near zero

input current. This allows very high resistance circuits to be

used without any concern for matching input resistances.

This also allows the use of very small capacitors in R-C type

timing circuits. This reduces the cost of the capacitors and

amount of board space used.

CAPACITIVE LOADS

The high output current drive allows large capacitive loads

with little effect. Capacitive loads as large as 10,000 pF have

no effect upon delay and only slow the transition by about 3

µs.

OUTPUT CURRENT

Even though these comparators use less than 1 µA supply

current, the outputs are able to drive very large currents.

The LMC7215 can source up to 50 mA when operated on a

5V supply. Both the LMC7215 and LMC7225 can sink over

20 mA. (See the graph of Max I

vs. V

SUPPLY

in the “Typical

Characteristics” section.)

This large current handling ability allows driving heavy loads

directly. LEDs, beepers and other loads can be driven easily.

The push-pull output stage of the LMC7215 is a very impor-

tant feature. This keeps the total system power consumption

to the absolute minimum. The only current consumed is the

less than 1 µA supply current and the current going directly

into the load. No power is wasted in a pull-up resistor when

the output is low. The LMC7225 is only recommended where

a level shifting function from one logic level to another is

desired, where the LMC7225 is being used as a drop-in

lower power replacement for an older comparator or in cir-

cuits where more than one output will be paralleled.

01285304

FIGURE 1.

01285305

FIGURE 2.

LMC7215/LMC7225

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Application Information (Continued)

POWER DISSIPATION

The large output current ability makes it possible to exceed

the maximum operating junction temperature of 85˚C and

possibly even the absolute maximum junction temperature of

150˚C.

The thermal resistance of the 8-pin SOIC package is

165˚C/W. Shorting the output to ground with a 2.7V supply

will only result in about 5˚C rise above ambient.

The thermal resistance of the much smaller 5-Pin SOT23

package is 325˚C/W. With a 2.7V supply, the raise is only

10.5˚C but if the supply is 5V and the short circuit current is

50 mA, this will cause a raise of 41˚C in the 8-Pin SOIC and

81˚C in the 5-Pin SOT23. This should be kept in mind if

driving very low resistance loads.

SHOOT-THROUGH

Shoot-through is a common occurrence on digital circuits

and comparators where there is a push-pull output stage.

This occurs when a signal is applied at the same time to both

the N-channel and P-channel output transistors to turn one

off and turn the other on. (See Figure 3.) If one of the output

devices responds slightly faster than the other, the fast one

can be turned on before the other has turned off. For a very

short time, this allows supply current to flow directly through

both output transistors. The result is a short spike of current

drawn from the supply.

The LMC7215 produces a small current spike of 300 µA

peak for about 400 ns with 2.7V supply and 1.8 mA peak for

400 ns with a 5V supply. This spike only occurs when the

output is going from high to low. It does not occur when going

from low to high. Figure 4 and Figure 5 show what this

current pulse looks like on 2.7V and 5V supplies. The upper

trace is the output voltage and the lower trace is the supply

current as measured with the circuit in Figure 6 .

If the power supply has a very high impedance, a bypass

capacitor of 0.01 µF should be more than enough to mini-

mize the effects of this small current pulse.

01285306

FIGURE 3.

01285307

FIGURE 4. R

= 100Ω

01285308

FIGURE 5. R

=10Ω

LMC7215/LMC7225

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Application Information (Continued) LATCH-UP

In the past, most CMOS IC’s were susceptible to a damaging

phenomena known as latch-up. This occurred when an ESD

current spike or other large signal was applied to any of the

pins of an IC. The LMC7215 and LMC7225 both are de-

signed to make them highly resistant to this type of damage.

They have passed qualification tests with input currents on

any lead up to 300 mA at temperatures up to 125˚C.

SPICE MODELS

For a SPICE model of the LMC7215, LMC7225 and many

other op amps and comparators, contact the NSC Customer

Response Center at 800-272-9959 or on the World Wide

Web at http://www.national.com/models/index.html.

Ordering Information

Package Part Number Package Marking Transport Media NSC Drawing

8-Pin SOIC LMC7215IM LMC7215IM 95 Units/Rail M08A

LMC7215IMX 2.5k Units Tape and Reel

5-Pin SOT23 LMC7215IM5 C02B 1k Units Tape and Reel MF05A

LMC7215IM5X 3k Units Tape and Reel

LMC7225IM5 C03B 1k Units Tape and Reel

LMC7225IM5X 3k Units Tape and Reel

SOT-23-5 Tape and Reel Specification

REEL DIMENSIONS

01285310

8 mm 7.00 0.059 0.512 0.795 2.165 0.331 + 0.059/−0.000 0.567 W1+ 0.078/−0.039

330.00 1.50 13.00 20.20 55.00 8.40 + 1.50/−0.00 14.40 W1 + 2.00/−1.00

Tape Size A B C D N W1 W2 W3

01285309

FIGURE 6.

LMC7215/LMC7225

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SOT-23-5 Tape and Reel Specification (Continued)

TAPE FORMAT

Tape Section # Cavities Cavity Status Cover Tape Status

Leader 0 (min) Empty Sealed

(Start End) 75 (min) Empty Sealed

Carrier 3000 Filled Sealed

1000 Filled Sealed

Trailer 125 (min) Empty Sealed

(Hub End) 0 (min) Empty Sealed

TAPE DIMENSIONS

01285311

8 mm 0.130 0.124 0.130 0.126 0.138 ±0.002 0.055 ±0.004 0.157 0.315 ±0.012

(3.3) (3.15) (3.3) (3.2) (3.5 ±0.05) (1.4 ±0.11) (4) (8 ±0.3)

Tape Size DIM A DIM Ao DIM B DIM Bo DIM F DIM Ko DIM P1 DIM W

LMC7215/LMC7225

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Physical Dimensions inches (millimeters) unless otherwise noted

8-Pin SOIC

NS Package Number M08A

5-Pin SOT23

NS Package Number MF05A

LMC7215/LMC7225

www.national.com 10

Notes

National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves

the right at any time without notice to change said circuitry and specifications.

For the most current product information visit us at www.national.com.

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LMC7215/LMC7225 Micro-Power, Rail-to-Rail CMOS Comparators with Push-Pull/Open-Drain

Outputs and TinyPak Package