LMC7101AIM5XNOPB - NATIONAL SEMICONDUCTOR

LMC6762

LMC6762 Dual MicroPower Rail-To-Rail Input CMOS Comparator with Push-Pull

Output

Literature Number: SNOS739C

LMC6762

Dual MicroPower Rail-To-Rail Input CMOS Comparator

with Push-Pull Output

General Description

The LMC6762 is an ultra low power dual comparator with a

maximum supply current of 10 µA/comparator. It is designed

to operate over a wide range of supply voltages, from 2.7V to

15V. The LMC6762 has guaranteed specs at 2.7V to meet

the demands of 3V digital systems.

The LMC6762 has an input common-mode voltage range

which exceeds both supplies. This is a significant advantage

in low-voltage applications. The LMC6762 also features a

push-pull output that allows direct connections to logic de-

vices without a pull-up resistor.

A quiescent power consumption of 50 µW/amplifier

(@V

= 5V) makes the LMC6762 ideal for applications in

portable phones and hand-held electronics. The ultra-low

supply current is also independent of power supply voltage.

Guaranteed operation at 2.7V and a rail-to-rail performance

makes this device ideal for battery-powered applications.

Refer to the LMC6772 datasheet for an open-drain version

of this device.

Features

(Typical unless otherwise noted)

nLow power consumption (max): I

= 10 µA/comp

nWide range of supply voltages: 2.7V to 15V

nRail-to-rail input common mode voltage range

nRail-to-rail output swing (Within 100 mV of the supplies,

= 2.7V, and I

LOAD

= 2.5 mA)

nShort circuit protection: 40 mA

nPropagation delay (@V

= 5V, 100 mV

overdrive): 4 µs

Applications

nLaptop computers

nMobile phones

nMetering systems

nHand-held electronics

nRC timers

nAlarm and monitoring circuits

nWindow comparators, multivibrators

Connection Diagram

8-Pin DIP/SO

01232001

Top View

Typical Application

01232016

Zero Crossing Detector

August 2000

LMC6762 Dual MicroPower Rail-To-Rail Input CMOS Comparator with Push-Pull 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) 2 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 ±5mA

Current at Output Pin

(Notes 7, 3) ±30 mA

Current at Power Supply Pin,

LMC6762 40 mA

Lead Temperature

(Soldering, 10 seconds) 260˚C

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

Junction Temperature (Note

150˚C

Operating Ratings (Note 1)

Supply Voltage 2.7 ≤V

≤15V

Junction Temperature Range

LMC6762AI, LMC6762BI −40˚C ≤T

≤+85˚C

Thermal Resistance (θ

)

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 T

= 25˚C, V

= 2.7V, V

−

= 0V, V

/2. Boldface limits apply at the

temperature extremes.

Symbol Parameter Conditions Typ

(Note 5)

LMC6762AI LMC6762BI Units

Limit Limit

(Note 6) (Note 6)

Input Offset Voltage 3 5 15 mV

818max

TCV

Input Offset Voltage 2.0 µV/˚C

Temperature Drift

Input Offset Voltage (Note 8) 3.3 µV/Month

Average Drift

Input Current 0.02 pA

Input Offset Current 0.01 pA

CMRR Common Mode Rejection Ratio 75 dB

PSRR Power Supply Rejection Ratio ±1.35V <V

<±7.5V 80 dB

Voltage Gain (By Design) 100 dB

Input Common-Mode CMRR >55 dB 3.0 2.9 2.9 V

Voltage Range 2.7 2.7 min

−0.3 −0.2 −0.2 V

0.0 0.0 max

Output Voltage High I

LOAD

= 2.5 mA 2.5 2.4 2.4 V

2.3 2.3 min

Output Voltage Low I

LOAD

= 2.5 mA 0.2 0.3 0.3 V

0.4 0.4 max

Supply Current For Both Comparators 12 20 20 µA

(Output Low) 25 25 max

LMC6762

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5.0V and 15.0V Electrical Characteristics

Unless otherwise specified, all limits guaranteed for T

= 25˚C, V

= 5.0V and 15.0V, V

−

= 0V, V

/2. Boldface limits ap-

ply at the temperature extremes.

Symbol Parameter Conditions Typ

(Note 5)

LMC6762AI LMC6762BI

UnitsLimit Limit

(Note 6) (Note 6)

Input Offset Voltage 3 5 15 mV

818max

TCV

Input Offset Voltage V

= 5V 2.0 µV/˚C

Temperature Drift V

= 15V 4.0

Input Offset Voltage V

= 5V (Note 8) 3.3 µV/Month

Average Drift V

= 15V (Note 8) 4.0

Input Current V = 5V 0.04 pA

Input Offset Current V

= 5V 0.02 pA

CMRR Common Mode V

=5V 75 dB

Rejection Ratio V

= 15V 82 dB

PSRR Power Supply Rejection Ratio ±2.5V <V

<±5V 80 dB

Voltage Gain (By Design) 100 dB

Input Common-Mode V

= 5.0V 5.3 5.2 5.2 V

Voltage Range CMRR >55 dB 5.0 5.0 min

−0.3 −0.2 −0.2 V

0.0 0.0 max

= 15.0V 15.3 15.2 15.2 V

CMRR >55 dB 15.0 15.0 min

−0.3 −0.2 −0.2 V

0.0 0.0 max

Output Voltage High V

= 5V 4.8 4.6 4.6 V

LOAD

= 5mA 4.45 4.45 min

= 15V 14.8 14.6 14.6 V

LOAD

=5mA 14.45 14.45 min

Output Voltage Low V

= 5V 0.2 0.4 0.4 V

LOAD

=5mA 0.55 0.55 max

= 15V 0.2 0.4 0.4 V

LOAD

=5mA 0.55 0.55 max

Supply Current For Both Comparators 12 20 20 µA

(Output Low) 25 25 max

Short Circuit Current Sourcing 30 mA

Sinking, V

= 12V 45

(Note 7)

LMC6762

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AC Electrical Characteristics

Unless otherwise specified, all limits guaranteed for T

= 25˚C, V

= 5V, V

−

= 0V, V

/2. Boldface limits apply at

the temperature extreme.

Symbol Parameter Conditions Typ

(Note 5)

LMC6762AI LMC6762BI Units

Limit Limit

(Note 6) (Note 6)

RISE

Rise Time f = 10 kHz, C

= 50 pF, 0.3 µs

Overdrive = 10 mV (Notes 9, 10)

FALL

Fall Time f = 10 kHz, C

= 50 pF, 0.3 µs

Overdrive = 10 mV (Notes 9, 10)

PHL

Propagation Delay f = 10 kHz, Overdrive = 10 mV 10 µs

(High to Low) C

= 50 pF Overdrive = 100 mV 4 µs

(Notes 9, 10)

= 2.7V, Overdrive = 10 mV 10 µs

f = 10 kHz,

= 50 pF Overdrive = 100 mV 4 µs

(Notes 9, 10)

PLH

Propagation Delay f = 10 kHz, Overdrive = 10 mV 6 µs

(Low to High) C

= 50 pF Overdrive = 100 mV 4 µs

(Notes 9, 10)

= 2.7V, Overdrive = 10 mV 7 µs

f = 10 kHz,

= 50 pF Overdrive = 100 mV 4 µs

(Notes 9, 10)

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 kΩin series with 100 pF.

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=(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.

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

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

Note 8: 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.

Note 9: CLincludes the probe and jig capacitance.

Note 10: The rise and fall times are measured with a 2V input step. The propagation delays are also measured with a 2V input step.

LMC6762

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Typical Performance Characteristics

= 5V, Single Supply, T

= 25˚C unless otherwise

specified

Supply Current vs Supply

Voltage (Output High)

Supply Current vs Supply

Voltage (Output Low)

01232020 01232021

Input Current vs

Common-Mode Voltage

Input Current vs

Common-Mode Voltage

01232022 01232023

Input Current vs

Common-Mode Voltage

Input Current

vs Temperature

01232024 01232025

LMC6762

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Typical Performance Characteristics V

= 5V, Single Supply, T

= 25˚C unless otherwise

specified (Continued)

∆V

vs ∆V

∆V

vs ∆V

01232026 01232027

∆V

vs ∆V

Output Voltage vs

Output Current (Sourcing)

01232028 01232029

Output Voltage vs

Output Current (Sourcing)

Output Voltage vs

Output Current (Sourcing)

01232030 01232031

LMC6762

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Typical Performance Characteristics V

= 5V, Single Supply, T

= 25˚C unless otherwise

specified (Continued)

Output Voltage vs

Output Current (Sinking)

Output Voltage vs

Output Current (Sinking)

01232032 01232033

Output Voltage vs

Output Current (Sinking)

Output Short Circuit Current

vs Supply Voltage (Sourcing)

01232034 01232035

Output Short Circuit Current

vs Supply Voltage (Sinking)

Response Time for

Overdrive (t

PLH

)

01232036 01232037

LMC6762

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Typical Performance Characteristics V

= 5V, Single Supply, T

= 25˚C unless otherwise

specified (Continued)

Response Time for

Overdrive (t

PHL

)

Response Time for

Overdrive (t

PLH

)

01232038 01232039

Response Time for

Overdrive (t

PHL

)

Response Time for

Overdrive (t

PLH

)

01232040 01232041

Response Time for

Overdrive (t

PHL

)

Response Time vs

Capacitive Load

01232042 01232043

LMC6762

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Application Hints

1.0 INPUT COMMON-MODE VOLTAGE RANGE

At supply voltages of 2.7V, 5V and 15V, the LMC6762 has an

input common-mode voltage range which exceeds both sup-

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

defined by the V

shift of the comparator over the common-

mode range of the device. A CMRR (∆V

/∆V

)of75dB

(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.

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

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

impedance makes the LMC6762 ideal for sensor applica-

tions. The LMC6762 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 LMC6762 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 LMC6762 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.

At V

= 2.7V, propagation delays are t

PLH

=4µsandt

PHL

4 µs with overdrives of 100 mV. Please refer to the perfor-

mance curves for more extensive characterization.

3.0 SHOOT-THROUGH CURRENT

The shoot-through current is defined as the current surge,

above the quiescent supply current, between the positive

and negative supplies of a device. The current surge occurs

when the output of the device switches states. This transient

switching current results in glitches in the supply voltage.

Usually, glitches in the supply lines are compensated by

bypass capacitors. When the switching currents are minimal,

the values of the bypass capacitors can be reduced consid-

erably.

01232005

FIGURE 1. An Input Signal Exceeds the LMC6762

Power Supply Voltages with No Output Phase

Inversion

01232006

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

01232007

FIGURE 3. LMC6762 Circuit for Measurement

of the Shoot-Through Current

LMC6762

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Application Hints (Continued)

From Figure 3 and Figure 4 the shoot-through current for the

LMC6762 can be approximated to be 0.2 mA (200 mV/1 kΩ).

The duration of the transient is measured as 1 µs. The

values needed for the local bypass capacitors can be calcu-

lated as follows:

01232009

Area of ∆=

⁄

(1 µs x 200 µA)

= 100 pC

If the local bypass capacitor has to provide this charge of

100 pC, the minimum value of the local capacitor to prevent

local degradation of V

can be calculated. Suppose that the

maximum voltage droop that the system can tolerate is

100mV,

∆Q =C*(∆V)

→C=(∆Q/∆V)

= 100 pC/100 mV

= 0.001 µF

The low internal feedthrough current of the LMC6762 thus

requires lower values for the local bypass capacitors. In

applications where precision is not critical, this is a signifi-

cant advantage, as lower values of capacitors result in sav-

ings of board space, and cost.

It is worth noting here that the delta shift of the power supply

voltage due to the transient currents causes a threshold shift

of the comparator. This threshold shift is reduced by the high

PSRR of the comparator. However, the value of the PSRR

applicable in this instance is the transient PSRR and not the

DC PSRR. The transient PSRR is significantly lower than the

DC PSRR.

Generally, it is a good goal to reduce the delta voltage on the

power supply to a value equal to or less than the hysteresis

of the comparator. For example, if the comparator has 50 mV

of hysteresis, it would be reasonable to increase the value of

the local bypass capacitor to 0.01 µF to reduce the voltage

delta to 10 mV.

4.0 OUTPUT SHORT CIRCUIT CURRENT

The LMC6762 has short circuit protection of 40 mA. How-

ever, it is not designed to withstand continuous short circuits,

transient voltage or current spikes, or shorts to any voltage

beyond 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.

5.0 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.

The capacitor added across the feedback resistor increases

the switching speed and provides more short term hyster-

esis. This can result in greater noise immunity for the circuit.

6.0 SPICE MACROMODEL

A Spice Macromodel is available for the LMC6762. 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.

Contact the National Semiconductor Customer Response

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

spice model library disk.

01232008

FIGURE 4. Measurement of the Shoot-Through Current

01232010

FIGURE 5. Canceling the Effect of Input Capacitance

LMC6762

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Typical Applications

ONE-SHOT MULTIVIBRATOR

A monostable multivibrator has one stable state in which it

can remain indefinitely. It can be triggered externally to

another 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 C

and R

. The resistor divider of R

and R

can be used to

determine the magnitude of the input trigger pulse. The

LMC6762 will change state when V

. Diode D

pro-

vides a rapid discharge path for capacitor C

to reset at the

end of the pulse. The diode also prevents the non-inverting

input from being driven below ground.

BI-STABLE MULTIVIBRATOR

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

voltage is set up by the voltage divider of R

and R

. A pulse

applied to the SET terminal will switch the output of the

comparator high. The resistor divider of R

, and R

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

A voltage divider of R

and R

establishes a reference

voltage V

at the non-inverting input. By making the series

resistance of R

and R

equal to R

, the comparator will

switch when V

= 0. Diode D

insures that V

never drops

below −0.7V. The voltage divider of R

and R

then prevents

from going below ground. A small amount of hysteresis is

setup to ensure rapid output voltage transitions.

OSCILLATOR

Figure 9 shows the application of the LMC6762 in a square

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

by R

and R

provide separate charge and

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

through R

and D

. So, the pulse width t

is determined by

the RC time constant of R

and C. Similarly, the discharge

path for the capacitor is set by R

and D

. Thus, the time t

between the pulses can be changed by varying R

, and the

pulse width can be altered by R

. The frequency of the

output can be changed by varying both R

and R

01232014

FIGURE 6. One-Shot Multivibrator

01232015

FIGURE 7. Bi-Stable Multivibrator

01232016

FIGURE 8. Zero Crossing Detector

01232019

FIGURE 9. Square Wave Generator

LMC6762

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Typical Applications (Continued)

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 V

= 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 output of comparator 4 swings high and C charges

exponentially through R. This is indicated above.

The output voltages of comparators 1, 2, and 3 switch to the

high state when V

rises above the reference voltage V

and V

. A small amount of hysteresis has been provided

to insure fast switching when the RC time constant is chosen

to give long delay times.

Ordering Information

Package Temperature Range NSC Drawing Transport

−40˚C to +85˚C Media

8-Pin Molded DIP LMC6762AIN, LMC6762BIN N08E Rails

8-Pin Small Outline LMC6762AIM, LMC6762BIM M08A Rails

LMC6762AIMX, LMC6762BIMX M08A Tape and Reel

01232018

FIGURE 10. Time Delay Generator

LMC6762

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Physical Dimensions inches (millimeters)

unless otherwise noted

8-Pin Small Outline Package

Order Number LMC6762AIM, LMC6762BIM, LMC6762AIMX or LMC6762BIMX

NS Package Number M08A

LMC6762

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Physical Dimensions inches (millimeters) unless otherwise noted (Continued)

8-Pin Molded Dual-In-Line Package

Order Number LMC6762AIN or LMC6762BIN

NS Package Number N08E

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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WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT AND GENERAL COUNSEL OF NATIONAL SEMICONDUCTOR

CORPORATION. As used herein:

1. Life support devices or systems are devices or systems

which, (a) are intended for surgical implant into the body, or

(b) support or sustain life, and whose failure to perform when

properly used in accordance with instructions for use

provided in the labeling, can be reasonably expected to result

in a significant injury to the user.

2. A critical component is any component of a life support

device or system whose failure to perform can be reasonably

expected to cause the failure of the life support device or

system, or to affect its safety or effectiveness.

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National Semiconductor certifies that the products and packing materials meet the provisions of the Customer Products Stewardship

Specification (CSP-9-111C2) and the Banned Substances and Materials of Interest Specification (CSP-9-111S2) and contain no ‘‘Banned

Substances’’ as defined in CSP-9-111S2.

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LMC6762 Dual MicroPower Rail-To-Rail Input CMOS Comparator with Push-Pull Output

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