April 2, 2008
LM111JAN
Voltage Comparator
General Description
The LM111 is a voltage comparator that has input currents
nearly a thousand times lower than devices such as the
LM106 or LM710. It is also designed to operate over a wider
range of supply voltages: from standard ±15V op amp sup-
plies down to the single 5V supply used for IC logic. The
output is compatible with RTL, DTL and TTL as well as MOS
circuits. Further, it can drive lamps or relays, switching volt-
ages up to 50V at currents as high as 50 mA.
Both the inputs and the outputs of the LM111 can be isolated
from system ground, and the output can drive loads referred
to ground, the positive supply or the negative supply. Offset
balancing and strobe capability are provided and outputs can
be wire OR'ed. Although slower than the LM106 and LM710
(200 ns response time vs 40 ns) the device is also much less
prone to spurious oscillations. The LM111 has the same pin
configuration as the LM106 and LM710.
Features
■Operates from single 5V supply
■Input current: 200 nA max. over temperature
■Offset current: 20 nA max. over temperature
■Differential input voltage range: ±30V
■Power consumption: 135 mW at ±15V
■Power supply voltage, single 5V to ±15V
■Offset voltage null capability
■Strobe capability
Ordering Information
NS PART NUMBER JAN PART NUMBER NS PACKAGE NUMBER PACKAGE DESCRIPTION
JL111BCA JM38510/10304BCA J14A 14LD CERDIP
JL111BGA JM38510/10304BGA H08C 8LD TO-99 Metal Can
JL111BHA JM38510/10304BHA W10A 10LD CERPACK
JL111BPA JM38510/10304BPA J08A 8LD CERDIP
JL111SGA JM38510/10304SGA H08C 8LD TO-99 Metal Can
JL111SHA JM38510/10304SHA W10A 10LD CERPACK
JL111SPA JM38510/10304SPA J08A 8LD CERDIP
JL111SZA JM38510/10304SZA WG10A 10LD Ceramic SOIC
© 2008 National Semiconductor Corporation 201420 www.national.com
LM111JAN Voltage Comparator
Connection Diagrams
Metal Can Package
20142006
Note: Pin 4 connected to case
Top View
See NS Package Number H08C
Dual-In-Line Package
20142034
Top View
See NS Package Number J08A
Dual-In-Line Package
20142035
Top View
See NS Package Number J14A
20142033
See NS Package Number W10A, WG10A
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LM111JAN
Absolute Maximum Ratings (Note 2)
Positive Supply Voltage +30.0V
Negative Supply Voltage -30.0V
Total Supply Voltage 36V
Output to Negative Supply Voltage 50V
GND to Negative Supply Voltage 30V
Differential Input Voltage ±30V
Sink Current 50mA
Input Voltage (Note 3) ±15V
Power Dissipation (Note 4)
8 LD CERDIP 400mW @ 25°C
8 LD Metal Can 330mW @ 25°C
10 LD CERPACK 330mW @ 25°C
10 LD Ceramic SOIC 330mW @ 25°C
14 LD CERDIP 400mW @ 25°C
Output Short Circuit Duration 10 seconds
Maximum Strobe Current 10mA
Operating Temperature Range -55°C ≤ TA ≤ 125°C
Thermal Resistance
θJA
8 LD CERDIP (Still Air @ 0.5W) 120°C/W
8 LD CERDIP (500LF/Min Air flow @ 0.5W) 76°C/W
8 LD Metal Can (Still Air @ 0.5W) 150°C/W
8 LD Metal Can (500LF/Min Air flow @ 0.5W) 92°C/W
10 Ceramic SOIC (Still Air @ 0.5W) 231°C/W
10 Ceramic SOIC (500LF/Min Air flow @ 0.5W) 153°C/W
10 CERPACK (Still Air @ 0.5W) 231°C/W
10 CERPACK (500LF/Min Air flow @ 0.5W) 153°C/W
14 LD CERDIP (Still Air @ 0.5W) 120°C/W
14 LD CERDIP (500LF/Min Air flow @ 0.5W) 65°C/W
θJC
8 LD CERDIP 35°C/W
8 LD Metal Can Pkg 40°C/W
10 LD Ceramic SOIC 60°C/W
10 LD CERPACK 60°C/W
14 LD CERDIP 35°C/W
Storage Temperature Range -65°C ≤ TA ≤ 150°C
Maximum Junction Temperature 175°C
Lead Temperature (Soldering, 60 seconds) 300°C
Voltage at Strobe Pin V+ -5V
Package Weight (Typical)
8 LD Metal Can 965mg
8 LD CERDIP 1100mg
10 LD CERPACK 250mg
10 LD Ceramic SOIC 225mg
14 LD CERDIP TBD
ESD Rating (Note 5) 300V
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LM111JAN
Recommended Operating Conditions
Supply Voltage VCC = ±15VDC
Operating Temperature Range -55°C ≤ TA ≤ 125°C
Quality Conformance Inspection
Mil-Std-883, Method 5005 — Group A
Subgroup Description Temperature (°C)
1 Static tests at +25
2 Static tests at +125
3 Static tests at -55
4 Dynamic tests at +25
5 Dynamic tests at +125
6 Dynamic tests at -55
7 Functional tests at +25
8A Functional tests at +125
8B Functional tests at -55
9 Switching tests at +25
10 Switching tests at +125
11 Switching tests at -55
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LM111JAN
LM111 JAN Electrical Characteristics
DC Parameters
The following conditions apply, unless otherwise specified.
DC: VCC = ±15V, VCM = 0
Symbol Parameter Conditions Notes Min Max Unit Sub-
groups
VIO Input Offset Voltage VI = 0V, RS = 50Ω -3.0 +3.0 mV 1
-4.0 +4.0 mV 2, 3
+VCC = 29.5V, -VCC = -0.5V,
VI = 0V, VCM = -14.5V,
RS = 50Ω
-3.0 +3.0 mV 1
-4.0 +4.0 mV 2, 3
+VCC = 2V, -VCC = -28V,
VI = 0V, VCM = +13V,
RS = 50Ω
-3.0 +3.0 mV 1
-4.0 +4.0 mV 2, 3
+VCC = +2.5V, -VCC = -2.5V,
VI = 0V, RS = 50Ω
-3.0 +3.0 mV 1
-4.0 +4.0 mV 2, 3
VIO R Raised Input Offset Voltage VI = 0V, RS = 50Ω (Note 10) -3.0 +3.0 mV 1
-4.5 +4.5 mV 2, 3
+VCC = 29.5V, -VCC = -0.5V,
VI = 0V, VCM = -14.5V,
RS = 50Ω
(Note 10)
-3.0 +3.0 mV 1
-4.5 +4.5 mV 2, 3
+VCC = 2V, -VCC = -28V,
VI = 0V, VCM = +13V,
RS = 50Ω
(Note 10)
-3.0 +3.0 mV 1
-4.5 +4.5 mV 2, 3
IIO Input Offset Current VI = 0V, RS = 50KΩ -10 +10 nA 1, 2
-20 +20 nA 3
+VCC = 29.5V, -VCC = -0.5V,
VI = 0V, VCM = -14.5V,
RS = 50KΩ
-10 +10 nA 1, 2
-20 +20 nA 3
+VCC = 2V, -VCC = -28V,
VI = 0V, VCM = +13V,
RS = 50KΩ
-10 +10 nA 1, 2
-20 +20 nA 3
IIOR Raised Input Offset Current VI = 0V, RS = 50KΩ(Note 10) -25 +25 nA 1, 2
-50 +50 nA 3
±IIB Input Bias Current VI = 0V, RS = 50KΩ -100 0.1 nA 1, 2
-150 0.1 nA 3
+VCC = 29.5V, -VCC = -0.5V,
VI = 0V, VCM = -14.5V,
RS = 50KΩ
-150 0.1 nA 1, 2
-200 0.1 nA 3
+VCC = 2V, -VCC = -28V,
VI = 0V, VCM = +13V,
RS = 50KΩ
-150 0.1 nA 1, 2
-200 0.1 nA 3
VOSt Collector Output Voltage (Strobe) +VI = Gnd, -VI = 15V,
ISt = -3mA, RS = 50Ω (Note 7) 14 V 1, 2, 3
CMRR Common Mode Rejection -28V ≤ -VCC ≤ -0.5V, RS=50Ω, 2V
≤ +VCC ≤ 29.5V, RS = 50Ω, -14.5V
≤ VCM ≤ 13V,RS = 50Ω
80 dB 1, 2, 3
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LM111JAN
Symbol Parameter Conditions Notes Min Max Unit Sub-
groups
VOL Low Level Output Voltage +VCC = 4.5V, -VCC = Gnd,
IO = 8mA, ±VI = 0.5V,
VID = -6mV
(Note 9) 0.4 V 1, 2, 3
+VCC = 4.5V, -VCC = Gnd,
IO = 8mA, ±VI = 3V,
VID = -6mV
(Note 9) 0.4 V 1, 2, 3
IO = 50mA, ±VI = 13V,
VID = -5mV (Note 9) 1.5 V 1, 2, 3
IO = 50mA, ±VI = -14V,
VID = -5mV (Note 9) 1.5 V 1, 2, 3
ICEX Output Leakage Current +VCC = 18V, -VCC = -18V,
VO = 32V
-1.0 10 nA 1
-1.0 500 nA 2
IIL Input Leakage Current +VCC = 18V, -VCC = -18V,
+VI = +12V, -VI = -17V -5.0 500 nA 1, 2, 3
+VCC = 18V, -VCC = -18V,
+VI = -17V, -VI = +12V -5.0 500 nA 1, 2, 3
+ICC Power Supply Current 6.0 mA 1, 2
7.0 mA 3
-ICC Power Supply Current -5.0 mA 1, 2
-6.0 mA 3
Δ VIO / Δ T Temperature Coefficient Input
Offset Voltage
25°C ≤ T ≤ 125°C (Note 8) -25 25 uV/°C 2
-55°C ≤ T ≤ 25°C (Note 8) -25 25 uV/°C 3
Δ IIO / Δ T Temperature Coefficient Input
Offset Current
25°C ≤ T ≤ 125°C (Note 8) -100 100 pA/°C 2
-55°C ≤ T ≤ 25°C (Note 8) -200 200 pA/°C 3
IOS Short Circuit Current VO = 5V, t ≤ 10mS, -VI = 0.1V,
+VI = 0V
200 mA 1
150 mA 2
250 mA 3
+VIO adj. Input Offset Voltage (Adjustment) VO = 0V, VI = 0V, RS = 50Ω 5.0 mV 1
-VIO adj. Input Offset Voltage (Adjustment) VO = 0V, VI = 0V, RS = 50Ω -5.0 mV 1
±AVE Voltage Gain (Emitter) RL = 600Ω (Note 6) 10 V/mV 4
(Note 6) 8.0 V/mV 5, 6
AC Parameters
The following conditions apply, unless otherwise specified.
AC: VCC = ±15V, VCM = 0
Symbol Parameter Conditions Notes Min Max Unit Sub-
groups
tRLHC Response Time (Collector
Output)
VOD(Overdrive) = -5mV,
CL = 50pF, VI = -100mV
300 nS 7, 8B
640 nS 8A
tRHLC Response Time (Collector
Output)
VOD(Overdrive) = 5mV,
CL = 50pF, VI = 100mV
300 nS 7, 8B
500 nS 8A
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LM111JAN
DC Drift Parameters
The following conditions apply, unless otherwise specified.
DC: VCC = ±15V, VCM = 0
Delta calculations performed on JANS devices at group B , subgroup 5.
Symbol Parameter Conditions Notes Min Max Unit Sub-
groups
VIO Input Offset Voltage VI = 0V, RS = 50Ω -0.5 0.5 mV 1
+VCC = 29.5V, -VCC = -0.5V,
VI = 0V, VCM = -14.5V,
RS = 50Ω
-0.5 0.5 mV 1
+VCC = 2V, -VCC = -28V,
VI = 0V, VCM = +13V,
RS = 50Ω
-0.5 0.5 mV 1
±IIB Input Bias Current VI = 0V, RS = 50KΩ -12.5 12.5 nA 1
+VCC = 29.5V, -VCC = -0.5V,
VI = 0V, VCM = -14.5V,
RS = 50KΩ
-12.5 12.5 nA 1
+VCC = 2V, -VCC = -28V,
VI = 0V, VCM = +13V,
RS = 50KΩ
-12.5 12.5 nA 1
ICEX Output Leakage Current +VCC = 18V, -VCC = -18V,
VO = 32V -5.0 5.0 nA 1
Note 2: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is
functional, but do not guarantee specific performance limits. For guaranteed specifications and test conditions, see the Electrical Characteristics. The guaranteed
specifications apply only for the test conditions listed. Some performance characteristics may degrade when the device is not operated under the listed test
conditions.
Note 3: This rating applies for ±15V supplies. The positive input voltage limit is 30 V above the negative supply. The negative input voltage limit is equal to the
negative supply voltage or 30V below the positive supply, whichever is less.
Note 4: The maximum power dissipation must be derated at elevated temperatures and is dictated by TJmax (maximum junction temperature), θJA (package
junction to ambient thermal resistance), and TA (ambient temperature). The maximum allowable power dissipation at any temperature is PDmax = (TJmax - TA)/
θJA or the number given in the Absolute Maximum Ratings, whichever is lower.
Note 5: Human body model, 1.5 kΩ in series with 100 pF.
Note 6: Datalog reading in K=V/mV.
Note 7: IST = −2mA at −55°C
Note 8: Calculated parameter.
Note 9: VID is voltage difference between inputs.
Note 10: Subscript (R) indicates tests which are performed with input stage current raised by connecting BAL and BAL/STB terminals to +VCC.
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LM111JAN
LM111 Typical Performance Characteristics
Input Bias Current
20142043
Input Bias Current
20142044
Input Bias Current
20142045
Input Bias Current
20142046
Input Bias Current
20142047
Input Bias Current
20142048
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LM111JAN
Input Bias Current
Input Overdrives
20142049
Input Bias Current
Input Overdrives
20142050
Input Bias Current
20142051
Response Time for Various
Input Overdrives
20142052
Response Time for Various
Input Overdrives
20142053
Output Limiting Characteristics
20142054
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LM111JAN
Supply Current
20142055
Supply Current
20142056
Leakage Currents
20142057
Application Hints
CIRCUIT TECHNIQUES FOR AVOIDING
OSCILLATIONS IN COMPARATOR APPLICATIONS
When a high-speed comparator such as the LM111 is used
with fast input signals and low source impedances, the output
response will normally be fast and stable, assuming that the
power supplies have been bypassed (with 0.1 μF disc capac-
itors), and that the output signal is routed well away from the
inputs (pins 2 and 3) and also away from pins 5 and 6.
However, when the input signal is a voltage ramp or a slow
sine wave, or if the signal source impedance is high (1 kΩ to
100 kΩ), the comparator may burst into oscillation near the
crossing-point. This is due to the high gain and wide band-
width of comparators such as the LM111. To avoid oscillation
or instability in such a usage, several precautions are recom-
mended, as shown in Figure 1 below.
1. The trim pins (pins 5 and 6) act as unwanted auxiliary
inputs. If these pins are not connected to a trim-pot, they
should be shorted together. If they are connected to a
trim-pot, a 0.01 μF capacitor C1 between pins 5 and 6
will minimize the susceptibility to AC coupling. A smaller
capacitor is used if pin 5 is used for positive feedback as
in Figure 1.
2. Certain sources will produce a cleaner comparator
output waveform if a 100 pF to 1000 pF capacitor C2 is
connected directly across the input pins.
3. When the signal source is applied through a resistive
network, RS, it is usually advantageous to choose an RS
′ of substantially the same value, both for DC and for
dynamic (AC) considerations. Carbon, tin-oxide, and
metal-film resistors have all been used successfully in
comparator input circuitry. Inductive wire wound resistors
are not suitable.
4. When comparator circuits use input resistors (e.g.
summing resistors), their value and placement are
particularly important. In all cases the body of the resistor
should be close to the device or socket. In other words
there should be very little lead length or printed-circuit foil
run between comparator and resistor to radiate or pick
up signals. The same applies to capacitors, pots, etc. For
example, if RS=10 kΩ, as little as 5 inches of lead
between the resistors and the input pins can result in
oscillations that are very hard to damp. Twisting these
input leads tightly is the only (second best) alternative to
placing resistors close to the comparator.
5. Since feedback to almost any pin of a comparator can
result in oscillation, the printed-circuit layout should be
engineered thoughtfully. Preferably there should be a
ground plane under the LM111 circuitry, for example, one
side of a double-layer circuit card. Ground foil (or,
positive supply or negative supply foil) should extend
between the output and the inputs, to act as a guard. The
foil connections for the inputs should be as small and
compact as possible, and should be essentially
surrounded by ground foil on all sides, to guard against
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LM111JAN
capacitive coupling from any high-level signals (such as
the output). If pins 5 and 6 are not used, they should be
shorted together. If they are connected to a trim-pot, the
trim-pot should be located, at most, a few inches away
from the LM111, and the 0.01 μF capacitor should be
installed. If this capacitor cannot be used, a shielding
printed-circuit foil may be advisable between pins 6 and
7. The power supply bypass capacitors should be located
within a couple inches of the LM111. (Some other
comparators require the power-supply bypass to be
located immediately adjacent to the comparator.)
6. It is a standard procedure to use hysteresis (positive
feedback) around a comparator, to prevent oscillation,
and to avoid excessive noise on the output because the
comparator is a good amplifier for its own noise. In the
circuit of Figure 2, the feedback from the output to the
positive input will cause about 3 mV of hysteresis.
However, if RS is larger than 100Ω, such as 50 kΩ, it
would not be reasonable to simply increase the value of
the positive feedback resistor above 510 kΩ. The circuit
of Figure 3 could be used, but it is rather awkward. See
the notes in paragraph 7 below.
7. When both inputs of the LM111 are connected to active
signals, or if a high-impedance signal is driving the
positive input of the LM111 so that positive feedback
would be disruptive, the circuit of Figure 1 is ideal. The
positive feedback is to pin 5 (one of the offset adjustment
pins). It is sufficient to cause 1 to 2 mV hysteresis and
sharp transitions with input triangle waves from a few Hz
to hundreds of kHz. The positive-feedback signal across
the 82Ω resistor swings 240 mV below the positive
supply. This signal is centered around the nominal
voltage at pin 5, so this feedback does not add to the
VOS of the comparator. As much as 8 mV of VOS can be
trimmed out, using the 5 kΩ pot and 3 kΩ resistor as
shown.
8. These application notes apply specifically to the LM111
and LF111 families of comparators, and are applicable
to all high-speed comparators in general, (with the
exception that not all comparators have trim pins).
20142029
Pin connections shown are for LM111H in the H08 hermetic package
FIGURE 1. Improved Positive Feedback
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LM111JAN
20142030
Pin connections shown are for LM111H in the H08 hermetic package
FIGURE 2. Conventional Positive Feedback
20142031
FIGURE 3. Positive Feedback with High Source Resistance
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LM111JAN
Typical Applications (Note 13)
Offset Balancing
20142036
Strobing
20142037
Note: Do Not Ground Strobe Pin. Output is turned off when current is pulled from
Strobe Pin.
Increasing Input Stage Current (Note Increases typical
common mode slew from 7.0V/μs to 18V/μs. )
20142038
Note 11: Increases typical common mode slew from 7.0V/μs to 18V/μs.
Detector for Magnetic Transducer
20142039
Digital Transmission Isolator
20142040
Relay Driver with Strobe
20142041
*Absorbs inductive kickback of relay and protects IC from severe voltage tran-
sients on V++ line.
Note: Do Not Ground Strobe Pin.
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LM111JAN
Strobing off Both Input and Output Stages (Note Typical input current is 50 pA with inputs strobed off. )
20142042
Note: Do Not Ground Strobe Pin.
Note 12: Typical input current is 50 pA with inputs strobed off.
Note 13: Pin connections shown on schematic diagram and typical applications are for H08 metal can package.
Positive Peak Detector
20142023
*Solid tantalum
Zero Crossing Detector Driving MOS Logic
20142024
Typical Applications
(Pin numbers refer to H08 package)
Zero Crossing Detector Driving MOS Switch
20142013
100 kHz Free Running Multivibrator
20142014
*TTL or DTL fanout of two
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LM111JAN
10 Hz to 10 kHz Voltage Controlled Oscillator
20142015
*Adjust for symmetrical square wave time when VIN = 5 mV
†Minimum capacitance 20 pF Maximum frequency 50 kHz
Driving Ground-Referred Load
20142016
*Input polarity is reversed when using pin 1 as output.
Using Clamp Diodes to Improve Response
20142017
TTL Interface with High Level Logic
20142018
*Values shown are for a 0 to 30V logic swing and a 15V threshold.
†May be added to control speed and reduce susceptibility to noise spikes.
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LM111JAN
Crystal Oscillator
20142019
Comparator and Solenoid Driver
20142020
Precision Squarer
20142021
*Solid tantalum
†Adjust to set clamp level
Low Voltage Adjustable Reference Supply
20142022
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LM111JAN
*Solid tantalum
Positive Peak Detector
20142023
*Solid tantalum
Zero Crossing Detector Driving MOS Logic
20142024
Negative Peak Detector
20142025
*Solid tantalum
Precision Photodiode Comparator
20142026
*R2 sets the comparison level. At comparison, the photodiode has less than 5 mV across it, decreasing leakages by an order of magnitude.
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LM111JAN
Switching Power Amplifier
20142027
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LM111JAN
Switching Power Amplifier
20142028
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LM111JAN
Revision History Section
Released Revision Section Originator Changes
05/09/05 A New Release, Corporate format L. Lytle 1 MDS data sheets converted into one Corp.
data sheet format. MJLM111–X Rev 0D3 will
be archived.
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LM111JAN
Physical Dimensions inches (millimeters) unless otherwise noted
Metal Can Package (H)
NS Package Number H08C
Cavity Dual-In-Line Package (J)
NS Package Number J08A
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LM111JAN
Dual-In-Line Package (J)
NS Package Number J14A
Cerpack Package (W)
NS Package Number W10A
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LM111JAN
Cerpack Gull Wing Package (WG)
NS Package Number WG10A
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LM111JAN
Notes
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LM111JAN
Notes
LM111JAN Voltage Comparator
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