National Semiconductor LMC7211 Technical data

LMC7211 Tiny CMOS Comparator with Rail-to-Rail Input and Push-Pull Output

August 2002

General Description

The LMC7211 is a micropower CMOS comparator available in the space saving SOT23-5 package. This makes the comparator ideal for space and weight critical designs. The LMC7211 is supplied in two offset voltage grades, 5 mV and 15 mV.

The main benefits of the Tiny package are most apparent in small portable electronic devices, such as mobile phones, pagers, notebook computers, personal digital assistants, and PCMCIA cards. The rail-to-rail input voltage makes the LMC7211 a good choice for sensor interfacing, such as light detector circuits, optical and magnetic sensors, and alarm and status circuits.

The Tiny Comparator’s outside dimensions (length x width x height) of 3.05mm x 3.00mm x 1.43mm allow it to fit into tight spaces on PC boards.

See the LMC7221 for a comparator with an open-drain output.

Connection Diagrams

8-Pin SO-8

Features

n Tiny SOT 23-5 package saves space n Package is less than 1.43 mm thick n Guaranteed specs at 2.7V, 5V, 15V supplies n Typical supply current 7 µA at 5V n Response time of 4 µs at 5V n Push-pull output n Input common-mode range beyond V− and V+ n Low input current

Applications

n Battery Powered Products n Notebooks and PDAs n PCMCIA cards n Mobile Communications n Alarm and Security circuits n Direct Sensor Interface n Replaces amplifiers used as comparators with better

performance and lower current

5-Pin SOT23-5

Top View

01233701

Top View

01233702

Absolute Maximum Ratings (Note 1)

If Military/Aerospace specified devices are required,

LMC7211

please contact the National Semiconductor Sales Office/ Distributors for availability and specifications.

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

Junction Temperature

(Note 4) 150˚C

ESD Tolerance (Note 2) 2 kV

Differential Input Voltage (V

Voltage at Input/Output Pin (V

Supply Voltage (V

+–V−

) 16V

Current at Input Pin (Note

Current at Output Pin

(Notes 3, 8)

Current at Power Supply Pin 40 mA

) +0.3V to (−VCC)−0.3V

) + 0.3V to

(−V

)−0.3V

5mA

30 mA

Operating Ratings (Note 1)

Supply Voltage 2.7 ≤ V

Junction Temperature Range LMC7211AI, LMC7211BI

Thermal Resistance (θJA)

SO-8 Package,

8-Pin Surface Mount 180˚C/W

M05A Package,

5-Pin Surface Mount 325˚C/W

−40˚C ≤ T

Lead Temperature

(soldering, 10 sec) 260˚C

2.7V Electrical Characteristics

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

Typ LMC7211AI LMC7211BI

Symbol Parameter Conditions (Note 5) Limit Limit Units

(Note 6) (Note 6)

TCV

CMRR Common Mode 0V ≤ V

PSRR Power Supply 2.7V ≤ V

CMVR Input Common-Mode CMRR

Input Offset Voltage 3 5 15 mV

818max

Input Offset Voltage 1.0 µV/˚C

Temperature Drift

Input Offset Voltage (Note 10) 3.3 µV/Month

Average Drift

Input Current 0.04 pA

Input Offset Current 0.02 pA

≤ 2.7V 75 dB

Rejection Ratio

≤ 15V 80 dB

Rejection Ratio

Voltage Gain 100 dB

55 dB 3.0 2.9 2.9 V

Voltage Range 2.7 2.7 min

CMRR

55 dB −0.3 −0.2 −0.2 V

0.0 0.0 max

Output Voltage High I

= 2.5 mA 2.5 2.4 2.4 V

load

2.3 2.3 min

Output Voltage Low I

= 2.5 mA 0.2 0.3 0.3 V

load

0.4 0.4 max

Supply Current V

= Low 7 12 12 µA

OUT

14 14 max

≤ 15V

+85˚C

≤

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5.0V and 15.0V Electrical Characteristics

Unless otherwise specified, all limits guaranteed for TJ= 25˚C, V+= 5.0V and 15V, V−= 0V, VCM=VO=V+/2. Boldface limits apply at the temperature extremes.

Typ LMC7211AI LMC7211BI

Symbol Parameter Conditions (Note 5) Limit Limit Units

(Note 6) (Note 6)

TCV

CMRR Common Mode V+ = 5.0V 75 dB

PSRR Power Supply 5V ≤ V

CMVR Input Common-Mode V+ = 5.0V 5.3 5.2 5.2 V

Input Offset Voltage 3 5 15 mV

818max

Input Offset Voltage V+= 5V 1.0 µV/˚C

Temperature Drift V

Input Offset Voltage V

Average Drift V

= 15V 4.0

= 5V 3.3 µV/Month

= 15V 4.0

Input Current 0.04 pA

Input Offset Current 0.02 pA

Rejection Ration V+ = 15.0V 82 dB

≤ 10V 80 dB

Rejection Ratio

Voltage Gain 100 dB

Voltage Range CMRR

55 dB 5.0 5.0 min

V+ = 5.0V −0.3 −0.2 −0.2 V

CMRR

55 dB 0.0 0.0 max

V+ = 15.0V 15.3 15.2 15.2 V

CMRR

55 dB 15.0 15.0 min

V+ = 15.0V −0.3 −0.2 −0.2 V

CMRR

55 dB 0.0 0.0 max

Output Voltage High V+ = 5V 4.8 4.6 4.6 mV

=5mA 4.45 4.45 min

load

V+ = 15V 14.8 14.6 14.6 mV

=5mA 14.45 14.45 min

load

Output Voltage Low V+ = 5V 0.2 0.40 0.40 mV

=5mA 0.55 0.55 max

load

V+ = 15V 0.2 0.40 0.40 mV

=5mA 0.55 0.55 max

load

Supply Current V

= Low 7 14 14 µA

OUT

18 18 max

Short Circuit Current Sourcing 30 mA

Sinking (Note 8) 45 mA

LMC7211

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.

Typ LMC7211AI LMC7211BI

Symbol Parameter Conditions (Note 5) Limit Limit Units

(Note 6) (Note 6)

rise

fall

Rise Time f = 10 kHz, Cl = 50 pF, 0.3 µs

Overdrive = 10 mV (Note 9)

Fall Time f = 10 kHz, Cl = 50 pF, 0.3 µs

Overdrive = 10 mV (Note 9)

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AC Electrical Characteristics (Continued)

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.

LMC7211

Typ LMC7211AI LMC7211BI

Symbol Parameter Conditions (Note 5) Limit Limit Units

(Note 6) (Note 6)

PHL

PLH

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.

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

Note 4: The maximum power dissipation is a function of T P

=(T

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

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

Note 7: Limiting input pin current is only necessary for input voltages that exceed absolute maximum input voltage rating.

Note 8: Do not short circuit output to V+, when V+ is greater than 12V or reliability will be adversely affected.

Note 9: C

Note 10: Input offset voltage average drift is calculated by dividing the accelerated operating life V

case input conditions and includes the first 30 days of drift.

Note 11: Input step voltage for propagation delay measurement is 2V.

Propagation Delay f = 10 kHz, 10 mV 10 µs

(High to Low) Cl = 50 pF 100 mV 4

(Note 11) (Note 9)

V+ = 2.7V, 10 mV 10 µs

f = 10 kHz, 100 mV 4

Cl=50pF

(Note 9)

Propagation Delay f = 10 kHz, 10 mV 6 µs

(Low to High) Cl = 50p 100 mV 4

(Note 11) (Note 9)

V+ = 2.7V, 10 mV 7 µs

f = 10 kHz, 100 mV 4

Cl=50pF

(Note 9)

30 mA over long term may adversely affect reliability.

, θJA, and TA. The maximum allowable power dissipation at any ambient temperature is

J(max)−TA

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

includes the probe and jig capacitance.

J(max)

drift by the equivalent operational time. This represents worst

Ordering Information

Package Ordering NSC Drawing Package Transport Media

Information Number Marking

LMC7211AIM M08A LM7211AIM Rails

8-Pin SO-8

5-Pin SOT 23-5

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LMC7211AIMX M08A LM7211AIM 2.5k Units Tape and Reel

LMC7211BIM M08A LM7211BIM Rails

LMC7211BIMX M08A LM7211BIM 2.5k Units tape and Reel

LMC7211AIM5 MF05A C00A 1k Units Tape and Reel

LMC7211AIM5X MF05A C00A 3k Units Tape and Reel

LMC7211BIM5 MF05A C00B 1k Units Tape and Reel

LMC7211BIM5X MF05A C00B 3k Units Tape and Reel

LMC7211

Typical Performance Characteristics Single Supply T

= 25˚C unless specified

Supply Current vs. Supply Voltage Supply Current vs. Temperature while Sourcing

01233715 01233716

Supply Current vs. Temperature while Sinking Output Sourcing Current vs. Supply Voltage

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Output Sinking Current vs. Supply Voltage Output Sinking Current vs. Output Voltage@5V

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