LM111/LM211/LM311
Voltage Comparator
1.0 General Description
The LM111, LM211 and LM311 are voltage comparators that
have input currents nearly a thousand times lower than
devices like the LM106 or LM710. They are also designed to
operate over a wider range of supply voltages: from standard
15V op amp supplies down to the single 5V supply used for
IC logic. Their output is compatible with RTL, DTL and TTL
as well as MOS circuits. Further, they can drive lamps or
relays, switching voltages up to 50V at currents as high as
50 mA.
Both the inputs and the outputs of the LM111, LM211 or the
LM311 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 devices are also much less prone to spurious oscilla-
tions. The LM111 has the same pin configuration as the
LM106 and LM710.
The LM211 is identical to the LM111, except that its perfor-
mance is specified over a -25C to +85C temperature range
instead of -55C to +125C. The LM311 has a temperature
range of 0C to +70C.
2.0 Features
n
Operates from single 5V supply
n
Input current: 150 nA max. over temperature
n
Offset current: 20 nA max. over temperature
n
Differential input voltage range:
30V
n
Power consumption: 135 mW at
15V
3.0 Typical Applications
(Note 3)
Offset Balancing
Strobing
00570436
00570437
Note: Do Not Ground Strobe Pin. Output is turned off when current is
pulled from Strobe Pin.
Increasing Input Stage Current (Note 1)
Detector for Magnetic Transducer
00570438
Note 1: Increases typical common mode slew from 7.0V/s to 18V/s.
00570439
January 2001
LM1
1
1/LM21
1/LM31
1
V
oltage
Comparator
2004 National Semiconductor Corporation
DS005704
www.national.com
3.0 Typical Applications
(Note 3)
(Continued)
Digital Transmission Isolator
Relay Driver with Strobe
00570440
00570441
*Absorbs inductive kickback of relay and protects IC from severe voltage
transients on V
++
line.
Note: Do Not Ground Strobe Pin.
Strobing off Both Input and Output Stages (Note 2)
00570442
Note: Do Not Ground Strobe Pin.
Note 2: Typical input current is 50 pA with inputs strobed off.
Note 3: Pin connections shown on schematic diagram and typical applications are for H08 metal can package.
Positive Peak Detector
Zero Crossing Detector Driving MOS Logic
00570423
*Solid tantalum
00570424
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1
1/LM21
1/LM31
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2
4.0 Absolute Maximum Ratings for
the LM111/LM211
(Note 10)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Total Supply Voltage (V
84
)
36V
Output to Negative Supply Voltage
(V
74
)
50V
Ground to Negative Supply Voltage
(V
14
)
30V
Differential Input Voltage
30V
Input Voltage (Note 4)
15V
Output Short Circuit Duration
10 sec
Operating Temperature Range
LM111
-55C to 125C
LM211
-25C to 85C
Lead Temperature (Soldering, 10 sec)
260C
Voltage at Strobe Pin
V
+
-5V
Soldering Information
Dual-In-Line Package
Soldering (10 seconds)
260C
Small Outline Package
Vapor Phase (60 seconds)
215C
Infrared (15 seconds)
220C
See AN-450 "Surface Mounting Methods and Their Effect
on Product Reliability" for other methods of soldering
surface mount devices.
ESD Rating (Note 11)
300V
Electrical Characteristics
(Note 6)
for the LM111 and LM211
Parameter
Conditions
Min
Typ
Max
Units
Input Offset Voltage (Note 7)
T
A
=25C, R
S
50k
0.7
3.0
mV
Input Offset Current
T
A
=25C
4.0
10
nA
Input Bias Current
T
A
=25C
60
100
nA
Voltage Gain
T
A
=25C
40
200
V/mV
Response Time (Note 8)
T
A
=25C
200
ns
Saturation Voltage
V
IN
-5 mV, I
OUT
=50 mA
0.75
1.5
V
T
A
=25C
Strobe ON Current (Note 9)
T
A
=25C
2.0
5.0
mA
Output Leakage Current
V
IN
5 mV, V
OUT
=35V
0.2
10
nA
T
A
=25C, I
STROBE
=3 mA
Input Offset Voltage (Note 7)
R
S
50 k
4.0
mV
Input Offset Current (Note 7)
20
nA
Input Bias Current
150
nA
Input Voltage Range
V
+
=15V, V
-
=-15V, Pin 7
-14.5
13.8,-14.7
13.0
V
Pull-Up May Go To 5V
Saturation Voltage
V
+
4.5V, V
-
=0
0.23
0.4
V
V
IN
-6 mV, I
OUT
8 mA
Output Leakage Current
V
IN
5 mV, V
OUT
=35V
0.1
0.5
A
Positive Supply Current
T
A
=25C
5.1
6.0
mA
Negative Supply Current
T
A
=25C
4.1
5.0
mA
Note 4: This rating applies for
15 supplies. The positive input voltage limit is 30V 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 5: The maximum junction temperature of the LM111 is 150C, while that of the LM211 is 110C. For operating at elevated temperatures, devices in the H08
package must be derated based on a thermal resistance of 165C/W, junction to ambient, or 20C/W, junction to case. The thermal resistance of the dual-in-line
package is 110C/W, junction to ambient.
Note 6: These specifications apply for V
S
=
15V and Ground pin at ground, and -55C
T
A
+125C, unless otherwise stated. With the LM211, however, all
temperature specifications are limited to -25C
T
A
+85C. The offset voltage, offset current and bias current specifications apply for any supply voltage from a single
5V supply up to
15V supplies.
Note 7: 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. Thus, these
parameters define an error band and take into account the worst-case effects of voltage gain and R
S
.
Note 8: The response time specified (see definitions) is for a 100 mV input step with 5 mV overdrive.
Note 9: 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 pin
to ground; it should be current driven at 3 to 5 mA.
Note 10: Refer to RETS111X for the LM111H, LM111J and LM111J-8 military specifications.
Note 11: Human body model, 1.5 k
in series with 100 pF.
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1
1/LM21
1/LM31
1
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5.0 Absolute Maximum Ratings for
the LM311
(Note 12)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Total Supply Voltage (V
84
)
36V
Output to Negative Supply Voltage
(V
74
)
40V
Ground to Negative Supply Voltage
(V
14
)
30V
Differential Input Voltage
30V
Input Voltage (Note 13)
15V
Power Dissipation (Note 14)
500 mW
ESD Rating (Note 19)
300V
Output Short Circuit Duration
10 sec
Operating Temperature Range
0 to 70C
Storage Temperature Range
-65C to 150C
Lead Temperature (soldering, 10 sec)
260C
Voltage at Strobe Pin
V
+
-5V
Soldering Information
Dual-In-Line Package
Soldering (10 seconds)
260C
Small Outline Package
Vapor Phase (60 seconds)
215C
Infrared (15 seconds)
220C
See AN-450 "Surface Mounting Methods and Their Effect
on Product Reliability" for other methods of soldering
surface mount devices.
Electrical Characteristics
(Note 15)
for the LM311
Parameter
Conditions
Min
Typ
Max
Units
Input Offset Voltage (Note 16)
T
A
=25C, R
S
50k
2.0
7.5
mV
Input Offset Current(Note 16)
T
A
=25C
6.0
50
nA
Input Bias Current
T
A
=25C
100
250
nA
Voltage Gain
T
A
=25C
40
200
V/mV
Response Time (Note 17)
T
A
=25C
200
ns
Saturation Voltage
V
IN
-10 mV, I
OUT
=50 mA
0.75
1.5
V
T
A
=25C
Strobe ON Current (Note 18)
T
A
=25C
2.0
5.0
mA
Output Leakage Current
V
IN
10 mV, V
OUT
=35V
T
A
=25C, I
STROBE
=3 mA
0.2
50
nA
V
-
= Pin 1 = -5V
Input Offset Voltage (Note 16)
R
S
50K
10
mV
Input Offset Current (Note 16)
70
nA
Input Bias Current
300
nA
Input Voltage Range
-14.5
13.8,-14.7
13.0
V
Saturation Voltage
V
+
4.5V, V
-
=0
0.23
0.4
V
V
IN
-10 mV, I
OUT
8 mA
Positive Supply Current
T
A
=25C
5.1
7.5
mA
Negative Supply Current
T
A
=25C
4.1
5.0
mA
Note 12: "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."
Note 13: This rating applies for
15V supplies. The positive input voltage limit is 30V 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 14: The maximum junction temperature of the LM311 is 110C. For operating at elevated temperature, devices in the H08 package must be derated based
on a thermal resistance of 165C/W, junction to ambient, or 20C/W, junction to case. The thermal resistance of the dual-in-line package is 100C/W, junction to
ambient.
Note 15: These specifications apply for V
S
=
15V and Pin 1 at ground, and 0C
<
T
A
<
+70C, unless otherwise specified. The offset voltage, offset current and
bias current specifications apply for any supply voltage from a single 5V supply up to
15V supplies.
Note 16: 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, these
parameters define an error band and take into account the worst-case effects of voltage gain and R
S
.
Note 17: The response time specified (see definitions) is for a 100 mV input step with 5 mV overdrive.
Note 18: 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
pin to ground; it should be current driven at 3 to 5 mA.
Note 19: Human body model, 1.5 k
in series with 100 pF.
LM1
1
1/LM21
1/LM31
1
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6.0 LM111/LM211 Typical Performance Characteristics
Input Bias Current
Input Bias Current
00570443
00570444
Input Bias Current
Input Bias Current
00570445
00570446
Input Bias Current
Input Bias Current
00570447
00570448
LM1
1
1/LM21
1/LM31
1
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