LF111 [NSC]
Voltage Comparators; 电压比较器
| 型号： | LF111 |
| 厂家： | 
National Semiconductor |
| 描述： | Voltage Comparators |
| 文件： | 总11页 (文件大小：222K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
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-
g
signed to operate over a 5.0V to 15V range the LF111
can be used in the most critical applications.
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
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.
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
TL/H/5703–2
Metal Can Package
TL/H/5703–1
Top View
Order Number LF111H, LF111H-MIL or LF311H
See NS Package Number H08C
C
1995 National Semiconductor Corporation
TL/H/5703
RRD-B30M115/Printed in U. S. A.
Absolute Maximum Ratings
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales
Office/Distributors for availability and specifications.
LF111/LF211
LF311
Operating Temp.
Range
(Note 8)
b
b
a
55 C to 125 C
LF111
§
§
LF111/LF211
36V
LF311
36V
a
25 C to 85 C
LF211
§
§
Total Supply Voltage (V
)
84
a
0 C to 70 C
LF311
§
§
Output to Negative Supply
Voltage (V
Storage Temp.
Range
)
50V
30V
40V
74
Ground to Negative Supply
Voltage (V
b
a
65 C to 150 C
b
a
65 C to 150 C
§
§
§
§
Lead Temp.
(Soldering,
10 seconds)
)
14
30V
30V
15V
g
g
g
g
Differential Input Voltage
Input Voltage (Note 1)
30V
15V
260 C
§
260 C
§
ESD rating to be determined.
Power Dissipation (Note 2)
Output Short Circuit Duration
500 mW
500 mW
10 seconds 10 seconds
Electrical Characteristics (LF111/LF211) (Note 3)
Parameter
Conditions
Min
Typ
Max
4.0
25
Units
mV
pA
pA
V/mV
ns
s
e
e
e
e
e
Input Offset Voltage (Note 4)
Input Offset Current (Note 4)
Input Bias Current
T
T
T
T
T
25 C, R
§
50k
0.7
5.0
A
A
A
A
A
S
e
e
25 C, V
§
0 (Note 6)
0 (Note 6)
CM
CM
25 C, V
§
20
50
Voltage Gain
25 C
§
40
200
200
0.75
3.0
Response Time (Note 5)
Saturation Voltage
25 C
§
b
s
e
e
50 mA, T 25 C
A
V
T
5.0 mV, I
OUT
1.5
V
§
IN
e
Strobe On Current
25 C
§
mA
nA
mV
nA
nA
V
A
s
e
e
25 C
Output Leakage Current
Input Offset Voltage (Note 4)
Input Offset Current (Note 4)
Input Bias Current
V
5.0 mV, V
35V, T
A
0.2
10
6.0
3.0
7.0
13.0
0.4
§
IN
OUT
s
R
50k
S
e
e
e
e
g
g
V
15V, V
15V, V
0 (Note 6)
0 (Note 6)
2.0
5.0
S
S
CM
V
CM
b
g
14
Input Voltage Range
Saturation Voltage
13.5
b
Va 4.5V, V
0
0.23
V
t
e
6.0 mV, I
s
s
b
V
V
T
8.0 mA
IN
OUT
t
e
Output Leakage Current
Positive Supply Current
Negative Supply Current
5.0 mV, V
OUT
35V
0.1
5.1
4.1
0.5
6.0
5.0
mA
mA
mA
IN
e
25 C
§
A
A
e
T
25 C
§
g
Note 1: 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.
a
a
a
Note 2: The maximum junction temperature of the LF111 is 150 C, the LF211 is 110 C and the LF311 is 85 C. For operating at elevated temperatures,
devices in the H08 package must be derated based on a thermal resistance of 65 C/W junction to ambient (in 400 linear feet/min air flow), 165 C/W junction
§
§
§
a
a
§
§
a
to ambient (in static air), or 20 C/W junction to case.
§
Note 3: These specifications apply for V
s
s
a
e
LF211, however, all temperature specifications are limited to 25 C
b
g
15V, and the Ground pin at ground, and 55 C
s
T
A
125 C for the LF111, unless otherwise stated. With the
§
A
§
85 C and for the LF311 0 C
S
s
s
s
b
current specifications apply for any supply voltage from a single 5.0V supply up to 15V supplies.
a
70 C. The offset voltage, offset current and bias
g
T
T
§
§
§
§
A
g
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 increaseÐsee 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
Electrical Characteristics (LF311) (Note 3)
Parameter
Conditions
Min
Typ
2.0
Max
10
Units
mV
pA
s
25 C, R 50k
e
e
e
e
e
Input Offset Voltage (Note 4)
Input Offset Current (Note 4)
Input Bias Current
T
T
T
T
T
§
A
A
A
A
A
S
e
e
25 C, V
§
0 (Note 6)
0 (Note 6)
5.0
75
CM
CM
25 C, V
§
25
150
pA
Voltage Gain
25 C
§
200
200
0.75
3.0
V/mV
ns
Response Time (Note 5)
Saturation Voltage
25 C
§
b
s
e
e
50 mA, T 25 C
A
V
T
10 mV, I
OUT
1.5
V
§
IN
e
Strobe On Current
25 C
§
mA
nA
A
t
e
e
25 C
Output Leakage Current
Input Offset Voltage (Note 4)
Input Offset Current (Note 4)
Input Bias Current
V
10mV, V
50k
35V, T
A
0.2
10
15
§
IN
OUT
s
e
e
R
mV
nA
S
S
S
e
g
V
V
15V, V
0 (Note 6)
1.0
3.0
CM
e
15V, V
CM
0 (Note 6)
nA
a
Input Voltage Range
14
V
V
b
13.5
b
Va 4.5V, V
0
t
e
Saturation Voltage
s
s
b
V
10 mV, I
OUT
8.0 mA
0.23
0.4
7.5
5.0
V
IN
e
Positive Supply Current
Negative Supply Current
T
25 C
§
5.1
4.1
mA
mA
A
A
e
T
25 C
§
g
Note 1: 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.
a
a
a
Note 2: The maximum junction temperature of the LF111 is 150 C, the LF211 is 110 C and the LF311 is 85 C. For operating at elevated temperatures,
devices in the H08 package must be derated based on a thermal resistance of 165 C/W, junction to ambient, or 20 C/W, junction to case.
§
§
§
a
a
§
§
s
s
a
e
a
b
g
Note 3: These specifications apply for V
s
15V and 55 C
§
T
A
125 C for the LF111, unless otherwise stated. With the LF211, however, all temperature
§
S
s
s
s
a
T
A
b
specifications are limited to 25 C
§
T
85 C and for the LF311 0 C
70 C. The offset voltage, offset current and bias current specifications apply for
§
§
§
A
g
any supply voltage from a single 5.0 mV supply up to 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 1.0 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 increaseÐsee 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.
Auxiliary Circuits
Increasing Input
Stage Current*
Offset Balancing
Strobing
TL/H/5703–15
*Increases typical common
mode slew from 7.0V/ms to
18V/ms
TL/H/5703–13
TL/H/5703–14
Note: Do Not Ground Strobe Pin.
3
Typical Performance Characteristics
Input Bias Current
vs Common Mode
Input Bias Current
vs Temperature
Transfer Function
TL/H/5703–4
4
Typical Applications
100 kHz Free Running Multivibrator
Crystal Oscillator
TL/H/5703–7
*TTL or DTL fanout of two.
TL/H/5703–3
10 Hz to 10 kHz Voltage Controlled Oscillator
TL/H/5703–5
5
Typical Applications (Continued)
Frequency Doubler
F
In
OutputÐ10 kHz to 100 kHz
TL/H/5703–8
Zero Crossing Detector Driving MOS Switch
Zero Crossing Detector Driving MOS Logic
TL/H/5703–9
TL/H/5703–10
Driving Ground-Referred Load
Comparator and Solenoid Driver
TL/H/5703–11
*Input polarity is reversed when using pin 1 as output.
TL/H/5703–12
6
Typical Applications (Continued)
Switching Power Amplifier
TL/H/5703–16
Switching Power Amplifier
TL/H/5703–17
7
Typical Applications (Continued)
Relay Driver with Strobe
*Absorbs inductive kickback of relay
and protects IC from severe voltage
transients on Vaa line.
TL/H/5703–18
Note: Do Not Ground Strobe Pin.
Positive Peak Detector
*Solid tantalum
TL/H/5703–19
Negative Peak Detector
*Solid tantalum
TL/H/5703–20
8
Typical Applications (Continued)
TTL Interface with High Level Logic
*Values shown are for a 0 to 30V lo
TL/H/5703–21
²
May be added to control speed and reduce susceptibility to noise spikes
Using Clamp Diodes to Improve Response
TL/H/5703–6
9
Physical Dimensions inches (millimeters)
Metal Can Package (H)
Order Number LF111H, LF111H-MIL or LF311H
NS Package Number H08C
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to the user.
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support device or system whose failure to perform can
be reasonably expected to cause the failure of the life
support device or system, or to affect its safety or
effectiveness.
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