Voltage Comparators. LF211 Datasheet

LF211 Comparators. Datasheet pdf. Equivalent

Part LF211
Description Voltage Comparators
Feature LF111 LF211 LF311 Voltage Comparators November 1994 LF111 LF211 LF311 Voltage Comparators General.
Manufacture National Semiconductor
Datasheet
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LF111 LF211 LF311 Voltage Comparators November 1994 LF111 LF211 Datasheet
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LF211
November 1994
LF111 LF211 LF311 Voltage Comparators
General Description
The LF111 LF211 and LF311 are FET input voltage com-
parators that virtually eliminate input current errors De-
signed to operate over a 5 0V to g15V range the LF111
can be used in the most critical applications
The extremely low input currents of the LF111 allows the
use of a simple comparator in applications usually requiring
input current buffering Leakage testing long time delay cir-
cuits charge measurements and high source impedance
voltage comparisons are easily done
Further the LF111 can be used in place of the LM111 elimi-
nating errors due to input currents See the ‘‘application
hints’’ of the LM311 for application help
Features
Y Eliminates input current errors
Y Interchangeable with LM111
Y No need for input current buffering
Schematic Diagram
Note Do Not Ground Strobe Pin or
Balance Strobe Pin See Note 7
Connection Diagram
Metal Can Package
TL H 5703 – 2
TL H 5703 – 1
Top View
Order Number LF111H LF111H-MIL or LF311H
See NS Package Number H08C
C1995 National Semiconductor Corporation TL H 5703
RRD-B30M115 Printed in U S A



LF211
Absolute Maximum Ratings
If Military Aerospace specified devices are required
please contact the National Semiconductor Sales
Office Distributors for availability and specifications
(Note 8)
Total Supply Voltage (V84)
Output to Negative Supply
Voltage (V74)
Ground to Negative Supply
Voltage (V14)
Differential Input Voltage
LF111 LF211
36V
50V
30V
g30V
LF311
36V
40V
30V
g30V
Input Voltage (Note 1)
g15V
g15V
Power Dissipation (Note 2)
500 mW
500 mW
Output Short Circuit Duration 10 seconds 10 seconds
Operating Temp
Range
LF111
LF211
LF311
LF111 LF211
b55 C to a125 C
b25 C to a85 C
Storage Temp
Range
b65 C to a150 C
Lead Temp
(Soldering
10 seconds)
260 C
ESD rating to be determined
LF311
0 C to a70 C
b65 C to a150 C
260 C
Electrical Characteristics (LF111 LF211) (Note 3)
Parameter
Conditions
Min Typ Max Units
Input Offset Voltage (Note 4)
Input Offset Current (Note 4)
Input Bias Current
Voltage Gain
Response Time (Note 5)
Saturation Voltage
Strobe On Current
Output Leakage Current
Input Offset Voltage (Note 4)
Input Offset Current (Note 4)
Input Bias Current
Input Voltage Range
TAe25 C RS s 50k
TAe25 C VCMe0 (Note 6)
TAe25 C VCMe0 (Note 6)
TAe25 C
TAe25 C
VINsb5 0 mV IOUTe50 mA TAe25 C
TAe25 C
VINs5 0 mV VOUTe35V TAe25 C
RS s 50k
VSe g15V VCMe0 (Note 6)
VSe g15V VCMe0 (Note 6)
40
b13 5
07
50
20
200
200
0 75
30
02
20
50
g14
40
25
50
15
10
60
30
70
13 0
mV
pA
pA
V mV
ns
V
mA
nA
mV
nA
nA
V
Saturation Voltage
Vat4 5V Vbe0
VINsb6 0 mV IOUTs8 0 mA
0 23 0 4
V
Output Leakage Current
VINt5 0 mV VOUTe35V
01 05
mA
Positive Supply Current
TAe25 C
51 60
mA
Negative Supply Current
TAe25 C
41 50
mA
Note 1 This rating applies for g15V 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 2 The maximum junction temperature of the LF111 is a150 C the LF211 is a110 C and the LF311 is a85 C For operating at elevated temperatures
devices in the H08 package must be derated based on a thermal resistance of a65 C W junction to ambient (in 400 linear feet min air flow) a165 C W junction
to ambient (in static air) or a20 C W junction to case
Note 3 These specifications apply for VSe g15V and the Ground pin at ground andb55 CsTAsa125 C for the LF111 unless otherwise stated With the
LF211 however all temperature specifications are limited to b25 CsTAsg85 C and for the LF311 0 CsTAsa70 C The offset voltage offset current and bias
current specifications apply for any supply voltage from a single 5 0V supply up to g15V 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 0 mA load Thus
these parameters define an error band and take into account the worst case effects of voltage gain and input impedance
Note 5 The response time specified (see definitions) is for a 100 mV input step with 5 0 mV overdrive
Note 6 For input voltages greater than 15V above the negative supply the bias and offset currents will increase see typical performance curves
Note 7 This specification gives the current that 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 8 Refer to RETSF111X for LF111H military specifications
2





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