LM7321MAXNOPB - NATIONAL SEMICONDUCTOR

LMC6772

LMC6772/LMC6772Q Dual Micropower Rail-To-Rail Input CMOS Comparator with

Open Drain Output

Literature Number: SNOS749E

LMC6772/LMC6772Q

January 8, 2010

Dual Micropower Rail-To-Rail Input CMOS Comparator

with Open Drain Output

General Description

The LMC6772 is an ultra low power dual comparator with a

maximum 10 μA/comparator power supply current. It is de-

signed to operate over a wide range of supply voltages, with

a minimum supply voltage of 2.7V.

The common mode voltage range of the LMC6772 exceeds

both the positive and negative supply rails, a significant ad-

vantage in single supply applications. The open drain output

of the LMC6772 allows for wired-OR configurations. The open

drain output also offers the advantage of allowing the output

to be pulled to any voltage rail up to 15V, regardless of the

supply voltage of the LMC6772.

The LMC6772 is targeted for systems where low power con-

sumption is the critical parameter. Guaranteed operation at

supply voltages of 2.7V and rail-to-rail performance makes

this comparator ideal for battery-powered applications.

Refer to the LMC6762 datasheet for a push-pull output stage

version of this device.

Features

(Typical unless otherwise noted)

■Low power consumption (max): IS = 10 μA/comp

■Wide range of supply voltages: 2.7V to 15V

■Rail-to-Rail input common mode voltage range

■Open drain output

■Short circuit protection: 40 mA

■Propagation delay (@VS = 5V, 100 mV overdrive): 5 μs

■LMC6772Q is AEC-Q qualified

■LMC6772Q has −40°C to 125°C temperature range

Applications

■Laptop computers

■Mobile phones

■Metering systems

■Hand-held electronics

■RC timers

■Alarm and monitoring circuits

■Window comparators, multivibrators

Connection Diagram

8-Pin MDIP/SOIC/MSOP

1234701

Top View

LMC6772/LMC6772Q Dual Micropower Rail-To-Rail Input CMOS Comparator

with Open Drain Output

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) 1.5 kV

Differential Input Voltage (V+)+0.3V to (V−)−0.3V

Voltage at Input/Output Pin (V+)+0.3V to (V−)−0.3V

Supply Voltage (V+–V−) 16V

Current at Input Pin (Note 8) ±5 mA

Current at Output Pin (Note 3, Note

±30 mA

Current at Power Supply Pin, LMC6772 40 mA

Lead Temperature (Soldering, 10 seconds) 260°C

Storage Temperature Range −65°C to 150°C

Junction Temperature (Note 4) 150°C

Operating Ratings (Note 1)

Supply Voltage 2.7 ≤ VS ≤ 15V

Junction Temperature Range

LMC6772AI, LMC6772BI −40°C ≤ TJ ≤ 85°C

LMC6772Q −40°C ≤ TJ ≤ 125°C

Thermal Resistance (θJA)

N Package, 8-Pin Molded DIP 100°C/W

M Package, 8-Pin Surface Mount 172°C/W

2.7V Electrical Characteristics

Unless otherwise specified, all limits guaranteed for TJ = 25°C, V+ = 2.7V, V− = 0V, VCM = V+/2. Boldface limits apply at the

temperature extremes.

Symbol Parameter Conditions Typ

(Note 5)

LMC6772AI LMC6772BI LMC6772Q Units

Limit Limit Limit

(Note 6) (Note 6) (Note 6)

VOS Input Offset Voltage 3 5

max

TCVOS Input Offset Voltage

Temperature Drift

2.0 μV/°C

Input Offset Voltage Average

Drift

(Note 10) 3.3 μV/

Month

IBInput Current 0.02 pA

IOS Input Offset Current 0.01 pA

CMRR Common Mode Rejection Ratio 75 dB

PSRR Power Supply Rejection Ratio ±1.35V < VS < ±7.5V 80 dB

AVVoltage Gain (By Design) 100 dB

VCM Input Common-Mode Voltage

Range

CMRR > 55 dB 3.0 2.9

2.7

2.9

2.7

2.9

2.7

min

−0.3 −0.2

0.0

−0.2

0.0

−0.2

0.2

max

VOL Output Voltage Low ILOAD = 2.5 mA 0.2 0.3

0.4

0.3

0.4

0.3

0.45

max

ISSupply Current For Both Comparators

(Output Low)

12 20

μA

max

ILeakage Output Leakage Current VIN(+) = 0.5V,

VIN(−) = 0V, VO = 15V

0.1 500 500 500

1000

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LMC6772/LMC6772Q

5.0V and 15.0V Electrical Characteristics

Unless otherwise specified, all limits guaranteed for TJ = 25°C, V+ = 5.0V and 15.0V, V− = 0V, VCM = V+/2. Boldface limits apply

at the temperature extremes.

Symbol Parameter Conditions Typ

(Note 5)

LMC6772AI LMC6772BI LMC6772Q Units

Limit Limit Limit

(Note 6) (Note 6) (Note 6)

VOS Input Offset Voltage 3 5

max

TCVOS Input Offset Voltage

Temperature Drift

V+ = 5V 2.0 μV/°C

V+ = 15V 4.0

Input Offset Voltage Average

Drift

V+ = 5V (Note 10) 3.3 μV/

Month

V+ = 15V (Note 10) 4.0

IBInput Current V = 5V 0.04 pA

IOS Input Offset Current V+ = 5V 0.02 pA

CMRR Common Mode Rejection Ratio V+ = 5V 75 dB

V+ = 15V 82

PSRR Power Supply Rejection Ratio ±2.5V < VS < ±5V 80 dB

AVVoltage Gain (By Design) 100 dB

VCM Input Common-Mode Voltage

Range

V+ = 5.0V

CMRR > 55 dB

5.3 5.2

5.0

5.2

5.0

5.2

5.0

min

−0.3 −0.2

0.0

−0.2

0.0

−0.2

0.0 Vmax

V+ = 15.0V

CMRR > 55 dB

15.3 15.2

15.0

15.2

15.0

15.2

15.0

min

−0.3 −0.2

0.0

−0.2

0.0

−0.2

0.0

max

VOL Output Voltage Low V+ = 5V

ILOAD = 5 mA

0.2 0.4

0.55

0.4

0.55

0.4

0.55

max

V+ = 15V

ILOAD = 5 mA

0.2 0.4

0.55

0.4

0.55

0.4

0.55

max

ISSupply Current For Both Comparators

(Output Low)

12 20

μA

max

ISC Short Circuit Current V+ = 15V, Sinking, VO = 12V

(Note 7)

45 mA

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LMC6772/LMC6772Q

AC Electrical Characteristics

Unless otherwise specified, all limits guaranteed for TJ = 25°C, V+ = 5V, V− = 0V, VCM = VO = V+/2. Boldface limits apply at the

temperature extreme.

Symbol Parameter Conditions Typ

(Note 5)

LMC6772AI LMC6772BI Units

Limit Limit

(Note 6) (Note 6)

tRISE Rise Time f = 10 kHz, CL = 50 pF,

Overdrive = 10 mV (Note 9)

0.3 μs

tFALL Fall Time f = 10 kHz, CL = 50 pF,

Overdrive = 10 mV (Note 9)

0.3 μs

tPHL Propagation Delay

(High to Low)

f = 10 kHz, 10 mV 10 μs

CL = 50 pF (Note 9)100 mV 4 μs

V+ = 2.7V, 10 mV 10 μs

f = 10 kHz,

CL = 50 pF (Note 9)100 mV 4 μs

tPLH Propagation Delay

(Low to High)

f = 10 kHz, 10 mV 10 μs

CL = 50 pF (Note 9)100 mV 4 μs

V+ = 2.7V,

f = 10 kHz, 10 mV 8 μs

CL = 50 pF (Note 9)100 mV 4 μs

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, 1.5 kΩ in series with 100 pF. The output pins of the two comparators (pin 1 and pin 7) have an ESD tolerance of 1.5 kV. All other

pins have an ESD tolerance of 2 kV.

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. Output currents in excess of ±30 mA over long term may adversely affect reliability.

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 = (TJ(MAX) – TA)/θJA. All numbers apply for packages soldered directly into a PC board.

Note 5: Typical Values represent the most likely parametric norm.

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

Note 7: Do not short circuit output to V+, when V+ is > 12V or reliability will be adversely affected.

Note 8: Limiting input pin current is only necessary for input voltages that exceed absolute maximum input voltage ratings.

Note 9: CL inlcudes the probe and jig capacitance. The rise time, fall time and propagation delays are measured with a 2V input step.

Note 10: Input offset voltage Average Drift is calculated by dividing the accelerated operating life drift average by the equivalent operational time. The input offset

voltage average drift represents the input offset voltage change at worst-case input conditions.

Ordering Information

Package Temperature Range

−40°C to 85°C

Package Marking Transport Media NSC Drawing Features

8-Pin MDIP LMC6772BIN LMC6772BIN 40 Units/Rail N08E

8-Pin SOIC

LMC6772AIM LMC6772AIM 95 Units/Rail

M08A

LMC6772AIMX 2.5k Units Tape and Reel

LMC6772BIM LMC6772BIM 95 Units/Rail

LMC6772BIMX 2.5k Units Tape and Reel

8-Pin MSOP

LMC6772AIMM C21 1k Units Tape and Reel

MUA08A

AEC-Q100 Grade 1

qualified. Automotive

Grade Production Flow*

LMC6772AIMMX 3.5k Units Tape and Reel

LMC6772QMM AX5A 1k Units Tape and Reel

LMC6772QMMX 3.5k Units Tape and Reel

*Automotive Grade (Q) product incorporates enhanced manufacturing and support processes for the automotive market, including defect detection methodologies.

Reliability qualification is compliant with the requirements and temperature grades defined in the AEC-Q100 standard. Automotive grade products are identified

with the letter Q. For more information go to http://www.national.com/automotive.

www.national.com 4

LMC6772/LMC6772Q

Typical Performance Characteristics V+ = 5V, Single Supply, TA = 25°C unless otherwise specified

Supply Current vs. Supply Voltage (Output High)

1234703

Supply Current vs. Supply Voltage (Output Low)

1234704

Input Current vs. Common-Mode Voltage

1234705

Input Current vs. Common-Mode Voltage

1234706

Input Current vs. Common-Mode Voltage

1234707

Input Current vs. Temperature

1234708

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LMC6772/LMC6772Q

ΔVOS vs ΔVCM, VS = 2.7V

1234709

ΔVOS vs ΔVCM, VS = 5V

1234710

ΔVOS vs ΔVCM, VS = 15V

1234711

Output Voltage vs. Output Current (Sinking)

1234712

Output Voltage vs. Output Current (Sinking)

1234713

Output Voltage vs. Output Current (Sinking)

1234714

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LMC6772/LMC6772Q

Output Short Circuit Current (Sinking) vs. Supply Voltage

1234715

Leakage Current vs. Output Voltage

1234716

Response Time for Overdrive (tPLH)

1234717

Response Time for Overdrive (tPHL)

1234718

Response Time for Overdrive (tPLH)

1234719

Response Time for Overdrive (tPHL)

1234720

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LMC6772/LMC6772Q

Response Time for Overdrive (tPLH)

1234721

Response Time for Overdrive (tPHL)

1234722

Response Time vs. Capacitive Load

1234723

LMC6772Q

Supply Current vs. Supply Voltage (Output High)

1234733

Supply Current vs. Supply Voltage (Output Low)

1234734

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LMC6772/LMC6772Q

Output Voltage vs. Output Current (Sinking)

1234735

Output Voltage vs. Output Current (Sinking)

1234736

Output Voltage vs. Output Current (Sinking)

1234737

Output Short Circuit Current vs. Supply

1234738

Output Leakage vs. Output Voltage

1234739

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LMC6772/LMC6772Q

Application Information

1.0 INPUT COMMON-MODE VOLTAGE RANGE

At supply voltages of 2.7V, 5V and 15V, the LMC6772 has an

input common-mode voltage range which exceeds both sup-

plies. As in the case of operational amplifiers, CMVR is de-

fined by the VOS shift of the comparator over the common-

mode range of the device. A CMRR (ΔVOS/ΔVCM) of 75 dB

(typical) implies a shift of < 1 mV over the entire common-

mode range of the device. The absolute maximum input

voltage at V+ = 5V is 200 mV beyond either supply rail at room

temperature.

1234724

FIGURE 1. An Input Signal Exceeds the LMC6772 Power

Supply Voltages with No Output Phase Inversion

A wide input voltage range means that the comparator can be

used to sense signals close to ground and also to the power

supplies. This is an extremely useful feature in power supply

monitoring circuits.

An input common-mode voltage range that exceeds the sup-

plies, 20 fA input currents (typical), and a high input

impedance makes the LMC6772 ideal for sensor applica-

tions. The LMC6772 can directly interface to sensors without

the use of amplifiers or bias circuits. In circuits with sensors

which produce outputs in the tens to hundreds of millivolts,

the LMC6772 can compare the sensor signal with an appro-

priately small reference voltage. This reference voltage can

be close to ground or the positive supply rail.

2.0 LOW VOLTAGE OPERATION

Comparators are the common devices by which analog sig-

nals interface with digital circuits. The LMC6772 has been

designed to operate at supply voltages of 2.7V, without sac-

rificing performance, to meet the demands of 3V digital sys-

tems.

At supply voltages of 2.7V, the common-mode voltage range

extends 200 mV (guaranteed) below the negative supply.

This feature, in addition to the comparator being able to sense

signals near the positive rail, is extremely useful in low voltage

applications.

1234725

FIGURE 2. Even at Low-Supply Voltage of 2.7V, an Input

Signal which Exceeds the Supply Voltages Produces No

Phase Inversion at the Output

At V+ = 2.7V, propagation delays are tPLH = 4 μs and tPHL = 4

μs with overdrives of 100 mV. Please refer to the performance

curves for more extensive characterization.

3.0 OUTPUT SHORT CIRCUIT CURRENT

The LMC6772 has short circuit protection of 40 mA. However,

it is not designed to withstand continuous short circuits, tran-

sient voltage or current spikes, or shorts to any voltage be-

yond the supplies. A resistor is series with the output should

reduce the effect of shorts. For outputs which send signals off

PC boards additional protection devices, such as diodes to

the supply rails, and varistors may be used.

4.0 HYSTERESIS

If the input signal is very noisy, the comparator output might

trip several times as the input signal repeatedly passes

through the threshold. This problem can be addressed by

making use of hysteresis as shown below.

1234726

FIGURE 3. Canceling the Effect of Input Capacitance

The capacitor added across the feedback resistor increases

the switching speed and provides more short term hysteresis.

This can result in greater noise immunity for the circuit.

5.0 SPICE MACROMODEL

A Spice Macromodel is available for the LMC6772. The model

includes a simulation of:

•Input common-mode voltage range

•Quiescent and dynamic supply current

•Input overdrive characteristics

and many more characteristics as listed on the macromodel

disk.

www.national.com 10

LMC6772/LMC6772Q

Contact the National Semiconductor Customer Response

Center at 1-800-272-9959 to obtain an operational amplifier

spice model library disk.

Typical Applications

UNIVERSAL LOGIC LEVEL SHIFTER

The output of the LMC6772 is the uncommitted drain of the

output NMOS transistor. Many drains can be tied together to

provide an output OR'ing function. An output pullup resistor

can be connected to any available power supply voltage with-

in the permitted power supply range.

1234727

FIGURE 4. Universal Logic Level Shifter

The two 1 kΩ resistors bias the input to half of the power sup-

ply voltage. The pull-up resistor should go to the output logic

supply. Due to its wide operating range, the LMC6772 is ideal

for the logic level shifting applications.

ONE-SHOT MULTIVIBRATOR

1234728

FIGURE 5. One-Shot Multivibrator

A monostable multivibrator has one stable state in which it

can remain indefinitely. It can be triggered externally to an-

other quasi-stable state. A monostable multivibrator can thus

be used to generate a pulse of desired width.

The desired pulse width is set by adjusting the values of C2

and R4. The resistor divider of R1 and R2 can be used to de-

termine the magnitude of the input trigger pulse. The

LMC6772 will change state when V1 < V2. Diode D2 provides

a rapid discharge path for capacitor C2 to reset at the end of

the pulse. The diode also prevents the non-inverting input

from being driven below ground.

BI-STABLE MULTIVIBRATOR

1234730

FIGURE 6. Bi-Stable Multivibrator

A bi-stable multivibrator has two stable states. The reference

voltage is set up by the voltage divider of R2 and R3. A pulse

applied to the SET terminal will switch the output of the com-

parator high. The resistor divider of R1, R4, and R5 now

clamps the non-inverting input to a voltage greater than the

reference voltage. A pulse applied to RESET will now toggle

the output low.

ZERO CROSSING DETECTOR

1234729

FIGURE 7. Zero Crossing Detector

A voltage divider of R4 and R5 establishes a reference voltage

V1 at the non-inverting input. By making the series resistance

of R1 and R2 equal to R5, the comparator will switch when

VIN = 0. Diode D1 insures that V3 never drops below −0.7V.

The voltage divider of R2 and R3 then prevents V2 from going

below ground. A small amount of hysteresis is setup to ensure

rapid output voltage transitions.

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LMC6772/LMC6772Q

OSCILLATOR

1234731

FIGURE 8. Square Wave Generator

Figure 8 shows the application of the LMC6772 in a square

wave generator circuit. The total hysteresis of the loop is set

by R1, R2 and R3. R4 and R5 provide separate charge and

discharge paths for the capacitor C. The charge path is set

through R4 and D1. So, the pulse width t1 is determined by the

RC time constant of R4 and C. Similarly, the discharge path

for the capacitor is set by R5 and D2. Thus, the time t2 between

the pulses can be changed by varying R5, and the pulse width

can be altered by R4. The frequency of the output can be

changed by varying both R4 and R5.

Time Delay Generator

1234732

FIGURE 9. Time Delay Generator

The circuit shown above provides output signals at a pre-

scribed time interval from a time reference and automatically

resets the output when the input returns to ground. Consider

the case of VIN = 0. The output of comparator 4 is also at

ground. This implies that the outputs of comparators 1, 2, and

3 are also at ground. When an input signal is applied, the out-

put of comparator 4 swings high and C charges exponentially

through R. This is indicated above. The output voltages of

comparators 1, 2, and 3 swtich to the high state when VC1

rises above the reference voltages VA, VB and VC. A small

amount of hysteresis has been provided to insure fast switch-

ing when the RC time constant is chosen to give long delay

times.

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LMC6772/LMC6772Q

Physical Dimensions inches (millimeters) unless otherwise noted

8-Pin MDIP

NS Package Number N08E

8-Pin SOIC

NS Package Number M08A

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LMC6772/LMC6772Q

8-Pin MSOP

NS Package Number MUA08A

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LMC6772/LMC6772Q

Notes

15 www.national.com

LMC6772/LMC6772Q

Notes

LMC6772/LMC6772Q Dual Micropower Rail-To-Rail Input CMOS Comparator

with Open Drain Output

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Amplifiers amplifier.ti.com Computers and Peripherals www.ti.com/computers

Data Converters dataconverter.ti.com Consumer Electronics www.ti.com/consumer-apps

DLP®Products www.dlp.com Energy and Lighting www.ti.com/energy

DSP dsp.ti.com Industrial www.ti.com/industrial

Clocks and Timers www.ti.com/clocks Medical www.ti.com/medical

Interface interface.ti.com Security www.ti.com/security

Logic logic.ti.com Space, Avionics and Defense www.ti.com/space-avionics-defense

Power Mgmt power.ti.com Transportation and Automotive www.ti.com/automotive

Microcontrollers microcontroller.ti.com Video and Imaging www.ti.com/video

RFID www.ti-rfid.com

OMAP Mobile Processors www.ti.com/omap

Wireless Connectivity www.ti.com/wirelessconnectivity

TI E2E Community Home Page e2e.ti.com

Mailing Address: Texas Instruments, Post Office Box 655303, Dallas, Texas 75265