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What is LM311?

This electronic component, produced by the manufacturer "Motorola Semiconductors", performs the same function as "HIGH PERFORMANCE VOLTAGE COMPARATORS".


LM311 Datasheet PDF - Motorola Semiconductors

Part Number LM311
Description HIGH PERFORMANCE VOLTAGE COMPARATORS
Manufacturers Motorola Semiconductors 
Logo Motorola Semiconductors Logo 


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Highly Flexible Voltage
Comparators
The ability to operate from a single power supply of 5.0 V to 30 V or ±15 V
split supplies, as commonly used with operational amplifiers, makes the
LM211/LM311 a truly versatile comparator. Moreover, the inputs of the
device can be isolated from system ground while the output can drive loads
referenced either to ground, the VCC or the VEE supply. This flexibility makes
it possible to drive DTL, RTL, TTL, or MOS logic. The output can also switch
voltages to 50 V at currents to 50 mA. Thus the LM211/LM311 can be used to
drive relays, lamps or solenoids.
Order this document by LM311/D
LM311
LM211
HIGH PERFORMANCE
VOLTAGE COMPARATORS
SEMICONDUCTOR
TECHNICAL DATA
Typical Comparator Design Configurations
Split Power Supply with Offset Balance
3.0 k VCC
Single Supply
VCC
Inputs
5.0 k
5
2
+
6
3
4
VEE
87
1
RL
Output
Inputs
28
+
7
3
1
VEE 4
RL
Output
Ground–Referred Load
VCC
2
Inputs 3
+8 7
1
4 RL
Output
VEE
Input polarity is reversed when
Gnd pin is used as an output.
Load Referred to Negative Supply
VCC
Inputs
2
+
8
7
31
4 RL
Output
VEE
Input polarity is reversed when
Gnd pin is used as an output.
Load Referred to Positive Supply
Inputs
2
+
3
4
VEE
VCC
8
7
1
RL
Output
Strobe Capability
VCC
Inputs
2+ 8
3
6
4
VEE
7
1
RL
Output
TTL Strobe
1.0 k
8
1
N SUFFIX
PLASTIC PACKAGE
CASE 626
8
1
D SUFFIX
PLASTIC PACKAGE
CASE 751
(SO–8)
PIN CONNECTIONS
Gnd 1
Inputs
2
3
VEE 4
+
8 VCC
7 Output
6 Balance/Strobe
5 Balance
(Top View)
ORDERING INFORMATION
Device
Operating
Temperature Range
Package
LM211D
LM311D
LM311N
TA = 25° to +85°C
TA = 0° to +70°C
SO–8
SO–8
Plastic DIP
MOTOROLA ANALOG IC DEVICE DATA
© Motorola, Inc. 1996
Rev 5
1

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LM311 equivalent
LM311 LM211
Figure 12. Output Leakage Current
versus Temperature
100
VCC = +15 V
VEE = –15 V
10
Figure 13. Power Supply Current
versus Supply Voltage
3.6
TA = +25°C
3.0
Positive Supply – Output Low
2.4
1.0
0.1
0.01
25
Output VO = +50 V (LM11/211 only)
45 65 85
TA, TEMPERATURE (°C)
105
125
1.8
Positive and Negative Power Supply – Output H igh
1.2
0.6
0
0
5.0 10
15
20 25
VCC–VEE, POWER SUPPLY VOLTAGE (V)
Figure 14. Power Supply Current
versus Temperature
3.0
2.6
Postive Supply – Output Low
VCC = +15 V
VEE = –15 V
2.2
30
1.8
Positive and Negative Supply – Output High
1.4
1.0
–55
–25
0 25 50 75
TA, TEMPERATURE (°C)
100 125
APPLICATIONS INFORMATION
Figure 15. Improved Method of Adding
Hysteresis Without Applying Positive
Feedback to the Inputs
Figure 16. Conventional Technique
for Adding Hysteresis
+15 V
+15 V
3.0 k 82
0.1 µF
33 k
5.0 k
C1
8 0.002
4.7 k
2 6 µF
Input +
R1 5
C2 LM311 1 7
Output
R2 3
4
3.0 k 4.7 k
0.1 µF
5.0 k
100
Input
R1
C2
100
R2
8 C1
36
+
LM311
5
17
24
Output
–15 V
0.1 µF
1.0 M
–15 V 510 k
0.1 µF
MOTOROLA ANALOG IC DEVICE DATA
5


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