LM111 LM211 LM311 Voltage Comparator

8/2/2019 LM111 LM211 LM311 Voltage Comparator

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TL H 5704

L M 1 1 1 L M 2 1 1 L M 3 1 1 V o l t a g e C o m p

a r a t o r

December 1994

LM111 LM211 LM311 Voltage ComparatorGeneral DescriptionThe LM111 LM211 and LM311 are voltage comparatorsthat have input currents nearly a thousand times lower thandevices like the LM106 or LM710 They are also designedto operate over a wider range of supply voltages from stan-dard g 15V op amp supplies down to the single 5V supplyused for IC logic Their output is compatible with RTL DTLand TTL as well as MOS circuits Further they can drivelamps or relays switching voltages up to 50V at currents ashigh as 50 mABoth the inputs and the outputs of the LM111 LM211 or theLM311 can be isolated from system ground and the outputcan drive loads referred to ground the positive supply or thenegative supply Offset balancing and strobe capability areprovided and outputs can be wire ORed Although slowerthan the LM106 and LM710 (200 ns response time vs

40 ns) the devices are also much less prone to spuriousoscillations The LM111 has the same pin configuration asthe LM106 and LM710The LM211 is identical to the LM111 except that its per-formance is specified over a b 25 C to a 85 C temperaturerange instead of b 55 C to a 125 C The LM311 has a tem-perature range of 0 C to a 70 C

FeaturesY Operates from single 5V supplyY Input current 150 nA max over temperatureY Offset current 20 nA max over temperatureY Differential input voltage range g 30VY Power consumption 135 mW at g 15V

Typical ApplicationsNote Pin connections shown on schematic di-

agram and typical applications are forH08 metal can package

Offset Balancing

Strobing

Note Do NotGround StrobePin Output isturned off whencurrent is pulledfrom Strobe Pin

Increasing Input Stage Current

Increases typical commonmode slew from 7 0V msto 18V ms

Detector for Magnetic Transducer Digital Transmission Isolator

Relay Driver with Strobe

Absorbs inductivekickback of relay andprotects IC fromsevere voltagetransients onVaa line

Note Do Not Ground Strobe Pin

Strobing off Both Input and Output Stages

Typical input current is50 pA with inputs strobed off

Note Do Not Ground Strobe PinTL H 57041

C 1995 National Semiconductor Corporation RRD-B30M115 Printed in U S A


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Absolute Maximum Ratings for the LM111 LM211If Military Aerospace specified devices are requiredplease contact the National Semiconductor SalesOffice Distributors for availability and specifications(Note 7)Total Supply Voltage (V 84 ) 36VOutput to Negative Supply Voltage (V 74 ) 50V

Ground to Negative Supply Voltage (V 14 ) 30VDifferential Input Voltage g 30VInput Voltage (Note 1) g 15VOutput Short Circuit Duration 10 secOperating Temperature Range LM111 b 55 C to 125 C

LM211 b 25 C to 85 C

Lead Temperature (Soldering 10 sec) 260 CVoltage at Strobe Pin V a b 5VSoldering Information

Dual-In-Line PackageSoldering (10 seconds) 260C

Small Outline Package

Vapor Phase (60 seconds) 215 CInfrared (15 seconds) 220C

See AN-450 Surface Mounting Methods and Their Effecton Product Reliability for other methods of soldering sur-face mount devicesESD Rating (Note 8) 300V

Electrical Characteristics for the LM111 and LM211 (Note 3)Parameter Conditions Min Typ Max Units

Input Offset Voltage (Note 4) T Ae 25 C RS s 50k 0 7 3 0 mV

Input Offset Current T Ae 25 C 4 0 10 nA

Input Bias Current T Ae 25 C 60 100 nA

Voltage Gain T Ae 25 C 40 200 V mV

Response Time (Note 5) T Ae

25 C 200 nsSaturation Voltage V INs b 5 mV IOUT e 50 mA 0 75 1 5 V

TAe 25 C

Strobe ON Current (Note 6) T Ae 25 C 2 0 5 0 mA

Output Leakage Current V INt 5 mV VOUT e 35V 0 2 10 nATAe 25 C ISTROBE e 3 mA

Input Offset Voltage (Note 4) R S s 50 k 4 0 mV

Input Offset Current (Note 4) 20 nA

Input Bias Current 150 nA

Input Voltage Range V a e 15V Vb eb 15V Pin 7 b 14 5 13 8 -14 7 13 0 VPull-Up May Go To 5V

Saturation Voltage V a t 4 5V Vb e 00 23 0 4 V

VINs b 6 mV IOUTs 8 mA

Output Leakage Current V INt 5 mV VOUT e 35V 0 1 0 5 mAPositive Supply Current T Ae 25 C 5 1 6 0 mA

Negative Supply Current T Ae 25 C 4 1 5 0 mA

Note 1 This rating applies for g 15 supplies The positive input voltage limit is 30V above the negative supply The negative input voltage limit is equal to thenegative supply voltage or 30V below the positive supply whichever is less

Note 2 The maximum junction temperature of the LM111 is 150 C while that of the LM211 is 110 C For operating at elevated temperatures devices in the H08package must be derated based on a thermal resistance of 165 C W junction to ambient or 20 C W junction to case The thermal resistance of the dual-in-linepackage is 110 C W junction to ambient

Note 3 These specifications apply for V S e g 15V and Ground pin at ground and b 55 C s TAs a 125 C unless otherwise stated With the LM211 however alltemperature specifications are limited to b 25 Cs TAs a 85 C The offset voltage offset current and bias current specifications apply for any supply voltage from asingle 5V supply up to g 15V supplies

Note 4 The offset voltages and offset currents given are the maximum values required to drive the output within a volt of either supply with a 1 mA load Thusthese parameters define an error band and take into account the worst-case effects of voltage gain and R SNote 5 The response time specified (see definitions) is for a 100 mV input step with 5 mV overdrive

Note 6 This specification gives the range of current which must be drawn from the strobe pin to ensure the output is properly disabled Do not short the strobe pinto ground it should be current driven at 3 to 5 mA

Note 7 Refer to RETS111X for the LM111H LM111J and LM111J-8 military specifications

Note 8 Human body model 1 5 k X in series with 100 pF

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Absolute Maximum Ratings for the LM311If Military Aerospace specified devices are requiredplease contact the National Semiconductor SalesOffice Distributors for availability and specificationsTotal Supply Voltage (V 84 ) 36VOutput to Negative Supply Voltage V 74 ) 40VGround to Negative Supply Voltage V 14 ) 30VDifferential Input Voltage g 30VInput Voltage (Note 1) g 15VPower Dissipation (Note 2) 500 mWESD Rating (Note 7) 300V

Output Short Circuit Duration 10 secOperating Temperature Range 0 to 70 CStorage Temperature Range b 65 C to 150 CLead Temperature (soldering 10 sec) 260 CVoltage at Strobe Pin V a b 5V

Soldering InformationDual-In-Line PackageSoldering (10 seconds) 260C

Small Outline PackageVapor Phase (60 seconds) 215 CInfrared (15 seconds) 220C

See AN-450 Surface Mounting Methods and Their Effecton Product Reliability for other methods of soldering sur-face mount devices

Electrical Characteristics for the LM311 (Note 3)Parameter Conditions Min Typ Max Units

Input Offset Voltage (Note 4) T Ae 25 C RS s 50k 2 0 7 5 mV

Input Offset Current (Note 4) T Ae 25 C 6 0 50 nA

Input Bias Current TA

e 25 C 100 250 nA

Voltage Gain T Ae 25 C 40 200 V mV

Response Time (Note 5) T Ae 25 C 200 ns

Saturation Voltage V INs b 10 mV IOUT e 50 mA 0 75 1 5 VTAe 25 C

Strobe ON Current (Note 6) T Ae 25 C 2 0 5 0 mA

Output Leakage Current V INt 10 mV VOUT e 35VTAe 25 C ISTROBE e 3 mA 0 2 50 nAVb e Pin 1 e b 5V

Input Offset Voltage (Note 4) R S s 50K 10 mV

Input Offset Current (Note 4) 70 nA

Input Bias Current 300 nA

Input Voltage Range b 14 5 13 8b 14 7 13 0 V

Saturation Voltage V a t 4 5V Vb e 0 0 23 0 4 VVINs b 10 mV IOUT s 8 mA

Positive Supply Current T Ae 25 C 5 1 7 5 mA

Negative Supply Current T Ae 25 C 4 1 5 0 mA

Note 1 This rating applies for g 15V supplies The positive input voltage limit is 30V above the negative supply The negative input voltage limit is equal to thenegative supply voltage or 30V below the positive supply whichever is less

Note 2 The maximum junction temperature of the LM311 is 110 C For operating at elevated temperature devices in the H08 package must be derated based on athermal resistance of 165 C W junction to ambient or 20 C W junction to case The thermal resistance of the dual-in-line package is 100 C W junction toambient

Note 3 These specifications apply for V S e g 15V and Pin 1 at ground and 0 C k TA k a 70 C unless otherwise specified The offset voltage offset current andbias current specifications apply for any supply voltage from a single 5V supply up to g 15V supplies

Note 4 The offset voltages and offset currents given are the maximum values required to drive the output within a volt of either supply with 1 mA load Thus theseparameters define an error band and take into account the worst-case effects of voltage gain and R SNote 5 The response time specified (see definitions) is for a 100 mV input step with 5 mV overdrive

Note 6 This specification gives the range of current which must be drawn from the strobe pin to ensure the output is properly disabled Do not short the strobe pinto ground it should be current driven at 3 to 5 mA

Note 7 Human body model 1 5 k X in series with 100 pF

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LM111 LM211 Typical Performance Characteristics

Input Bias Current Input Offset Current Offset Error

Input Characterist ics Common Mode Limits Transfer Funct ion

Response Time for VariousInput Overdrives

Response Time for VariousInput Overdrives Output Saturat ion Voltage

Response Time for VariousInput Overdrives

Response Time for VariousInput Overdrives Output Limiting Characteristics

TL H 57042

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LM111 LM211 Typical Performance Characteristics (Continued)Supply Current Supply Current Leakage Currents

TL H 57043

LM311 Typical Performance CharacteristicsInput Bias Current Input Offset Current Offset Error

TL H 57048

Input Characterist ics Common Mode Limits Transfer Funct ion

TL H 57049

Input OverdrivesResponse Time for Various


Output Saturation Voltage

TL H 570410

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LM311 Typical Performance Characteristics (Continued)



Output Limiting Characteristics

TL H 570411

Supply Current Supply Current Leakage Currents

TL H 570412

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Application HintsCIRCUIT TECHNIQUES FOR AVOIDINGOSCILLATIONS IN COMPARATOR APPLICATIONSWhen a high-speed comparator such as the LM111 is usedwith fast input signals and low source impedances the out-put response will normally be fast and stable assuming thatthe power supplies have been bypassed (with 0 1 mF disc

capacitors) and that the output signal is routed well awayfrom the inputs (pins 2 and 3) and also away from pins 5 and6However when the input signal is a voltage ramp or a slowsine wave or if the signal source impedance is high (1 k X to100 k X ) the comparator may burst into oscillation near thecrossing-point This is due to the high gain and wide band-width of comparators like the LM111 To avoid oscillation orinstability in such a usage several precautions are recom-mended as shown in Figure 1 below1 The trim pins (pins 5 and 6) act as unwanted auxiliary

inputs If these pins are not connected to a trim-pot theyshould be shorted together If they are connected to atrim-pot a 0 01 mF capacitor C1 between pins 5 and 6 willminimize the susceptibility to AC coupling A smaller ca-pacitor is used if pin 5 is used for positive feedback as inFigure 1

2 Certain sources will produce a cleaner comparator outputwaveform if a 100 pF to 1000 pF capacitor C2 is connect-ed directly across the input pins

3 When the signal source is applied through a resistive net-work RS it is usually advantageous to choose an R S ofsubstantially the same value both for DC and for dynamic(AC) considerations Carbon tin-oxide and metal-film re-sistors have all been used successfully in comparator in-put circuitry Inductive wirewound resistors are not suit-able

4 When comparator circuits use input resistors (eg sum-ming resistors) their value and placement are particularlyimportant In all cases the body of the resistor should beclose to the device or socket In other words there shouldbe very little lead length or printed-circuit foil run betweencomparator and resistor to radiate or pick up signals Thesame applies to capacitors pots etc For example ifRS e 10 k X as little as 5 inches of lead between the re-sistors and the input pins can result in oscillations that arevery hard to damp Twisting these input leads tightly isthe only (second best) alternative to placing resistorsclose to the comparator

5 Since feedback to almost any pin of a comparator canresult in oscillation the printed-circuit layout should beengineered thoughtfully Preferably there should be agroundplane under the LM111 circuitry for example oneside of a double-layer circuit card Ground foil (or positivesupply or negative supply foil) should extend between theoutput and the inputs to act as a guard The foil connec-tions for the inputs should be as small and compact aspossible and should be essentially surrounded by groundfoil on all sides to guard against capacitive coupling fromany high-level signals (such as the output) If pins 5 and 6are not used they should be shorted together If they areconnected to a trim-pot the trim-pot should be located atmost a few inches away from the LM111 and the 0 01mF capacitor should be installed If this capacitor cannotbe used a shielding printed-circuit foil may be advisablebetween pins 6 and 7 The power supply bypass capaci-tors should be located within a couple inches of theLM111 (Some other comparators require the power-sup-ply bypass to be located immediately adjacent to thecomparator )

TL H 570429

Pin connections shown are for LM111H in the H08 hermetic package

FIGURE 1 Improved Positive Feedback

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Application Hints (Continued)6 It is a standard procedure to use hysteresis (positive

feedback) around a comparator to prevent oscillationand to avoid excessive noise on the output because thecomparator is a good amplifier for its own noise In thecircuit of Figure 2 the feedback from the output to thepositive input will cause about 3 mV of hysteresis How-ever if R

Sis larger than 100 X such as 50 k X it would

not be reasonable to simply increase the value of thepositive feedback resistor above 510 k X the circuit ofFigure 3 could be used but it is rather awkward See thenotes in paragraph 7 below

7 When both inputs of the LM111 are connected to activesignals or if a high-impedance signal is driving the posi-tive input of the LM111 so that positive feedback wouldbe disruptive the circuit of Figure 1 is ideal The positive

feedback is to pin 5 (one of the offset adjustment pins) Itis sufficient to cause 1 to 2 mV hysteresis and sharptransitions with input triangle waves from a few Hz tohundreds of kHz The positive-feedback signal acrossthe 82 X resistor swings 240 mV below the positive sup-ply This signal is centered around the nominal voltage atpin 5 so this feedback does not add to the V

OSof the

comparator As much as 8 mV of V OS can be trimmedout using the 5 k X pot and 3 k X resistor as shown

8 These application notes apply specifically to the LM111LM211 LM311 and LF111 families of comparators andare applicable to all high-speed comparators in general(with the exception that not all comparators have trimpins)

TL H 570430

Pin connections shown are for LM111H in the H08 hermetic package

FIGURE 2 Conventional Positive Feedback

TL H 570431

FIGURE 3 Positive Feedback with High Source Resistance

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Typical Applications (Continued) (Pin numbers refer to H08 package)Zero Crossing Detector Driving MOS Switch

TL H 570413

100 kHz Free Running Multivibrator

TTL or DTL fanout of two TL H 570414

10 Hz to 10 kHz Voltage Controlled Oscillator

Adjust for symmetrical squarewave time when V IN e 5 mV

Minimum capacitance 20 pFMaximum frequency 50 kHz

TL H 570415

Driving Ground-Referred Load

Input polarity is reversedwhen using pin 1 as output TL H 570416

Using Clamp Diodes to Improve Response

TL H 570417

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Typical Applications (Continued) (Pin numbers refer to H08 package)TTL Interface with High Level Logic

TL H 570418

Values shown are for

a 0 to 30V logic swingand a 15V threshold

May be added to controlspeed and reducesusceptibility to noise spikes

Crystal Oscillator

TL H 570419

Comparator and Solenoid Driver

TL H 570420

Precision Squarer

Solid tantalum

Adjust to set clamp level TL H 570421

Low Voltage Adjustable Reference Supply

Solid tantalum TL H 570422

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Typical Applications (Continued) (Pin numbers refer to H08 package)

Positive Peak Detector


Zero Crossing Detector Driving MOS Logic

TL H 570424

Negative Peak Detector


Precision Photodiode Comparator

TL H 570426

R2 sets the comparison levelAt comparison the photodiodehas less than 5 mV across itdecreasing leakages by an orderof magnitude

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Typical Applications (Continued) (Pin numbers refer to H08 package)

Switching Power Amplifier

TL H 570427

Switching Power Amplifier

TL H 570428

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Schematic Diagram

TL H 57045

Pin connections shown on schematic diagram are for H08 package

Connection DiagramsMetal Can Package

TL H 57046

Top View

Note Pin 4 connected to case

Dual-In-Line Package

TL H 570434

Top View

Dual-In-Line Package

TL H 570435

Top View

Order Number LM111H

LM111H 883 LM211H or LM311HSee NS Package Number H08C

Order Number LM111J-8 LM111J-

8 883 LM211J-8 LM211MLM311M or LM311N

See NS Package Number J08AM08A or N08E

Order Number LM111J 883 or

LM311N-14See NS Package Number

J14A or N14A

Also available per JM38510 10304

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Connection Diagrams (Continued)

TL H 570432

Order Number LM111E 883See NS Package Number E20A

TL H 570433

Order Number LM111W 883See NS Package Number W10A

Also available per JM38510 10304

Physical Dimensions inches (millimeters)

Order Number LM111E 883NS Package Number E20A

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Physical Dimensions inches (millimeters) (Continued)

Metal Can Package (H)Order Number LM111H LM111H 883 LM211H or LM311H

NS Package Number H08C

Cavity Dual-In-Line Package (J)Order Number LM111J-8 LM111J-8 883 or LM211J-8

NS Package Number J08A

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Dual-In-Line Package (J)Order Number LM111J 883NS Package Number J14A

Dual-In-Line Package (M)Order Number LM211M or LM311M

NS Package Number M08A

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Dual-In-Line Package (N)Order Number LM311N

NS Package Number N08E

Dual-In-Line Package (N)Order Number LM311N-14NS Package Number N14A

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L M 1 1 1 L M 2 1 1 L M 3 1 1 V o l t a g e

C o m p a r a t o r


Order Number LM111W 883NS Package Number W10A

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LM111 LM211 LM311 Voltage Comparator

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