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LM161/LM361
High Speed Differential Comparators
General Description
The LM161/LM361 is a very high speed differential input,
complementary TTL output voltage comparator with improved characteristics over the SE529/NE529 for which it is
a pin-for-pin replacement.Thedevicehasbeenoptimizedfor
greater speed performance and lower input offset voltage.
Typically delay varies only 3 ns for over-drive variations of 5
mV to 500 mV. It may be operated from op amp supplies
(
±
15V).
Complementary outputs having maximum skew are provided. Applications involve high speed analog to digital converters and zero-crossing detectors in disk file systems.
Features
n Independent strobes
n Guaranteed high speed: 20 ns max
n Tight delay matching on both outputs
n Complementary TTL outputs
n Operates from op amp supplies:
±
15V
n Low speed variation with overdrive variation
n Low input offset voltage
n Versatile supply voltage range
Connection Diagrams Logic Diagram
Dual-In-Line Package
DS005708-2
Top View
Order Number LM361M, LM361MX or LM361N
See NS Package Number M14A or N14A
Metal Can Package
DS005708-3
Order Number LM161H/883 or LM361H
See NS Package Number H10C
DS005708-4
*
Output is low when current is drawn from strobe pin.
August 2000
LM161/LM361 High Speed Differential Comparators
© 2000 National Semiconductor Corporation DS005708 www.national.com
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Absolute Maximum Ratings (Note 1)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Positive Supply Voltage, V
+
+16V
Negative Supply Voltage, V
−
−16V
Gate Supply Voltage, V
CC
+7V
Output Voltage +7V
Differential Input Voltage
±
5V
Input Common Mode Voltage
±
6V
Power Dissipation 600 mW
Storage Temperature Range −65˚C to +150˚C
Operating Temperature Range T
MIN
T
MAX
LM161 −55˚C to +125˚C
−25˚C to +85˚C
LM361 0˚C to +70˚C
Lead Temp. (Soldering, 10 seconds) 260˚C
For Any Device Lead Below V
−
0.3V
Operating Conditions
Min Typ Max
Supply Voltage V
+
LM161 5V 15V
LM361 5V 15V
Supply Voltage V
−
LM161 −6V −15V
LM361 −6V −15V
Supply Voltage V
CC
LM161 4.5V 5V 5.5V
LM361 4.75V 5V 5.25V
ESD Tolerance (Note 5) 1600V
Soldering Information
Dual-In-Line Package
Soldering (10 seconds) 260˚C
Small Outline Package
Vapor Phase (60 seconds) 215˚C
Infrared (15 seconds) 220˚C
See AN-450 “Surface Mounting Methods andTheir Effect on
Product Reliability” for other methods of soldering surface
mount devices.
Electrical Characteristics
(V+= +10V, VCC= +5V, V−= −10V, T
MIN
≤ TA≤ T
MAX
, unless noted)
Limits
Parameter Conditions LM161 LM361 Units
Min Typ Max Min Typ Max
Input Offset Voltage 1 3 1 5 mV
Input Bias Current T
A
=25˚C 5 10 µA
20 30 µA
Input Offset Current T
A
=25˚C 2 2 µA
35µA
Voltage Gain T
A
=25˚C 3 3 V/mV
Input Resistance T
A
=25˚C, f=1 kHz 20 20 kΩ
Logical “1” Output Voltage V
CC
=4.75V, 2.4 3.3 2.4 3.3 V
I
SOURCE
=−0.5 mA
Logical “0” Output Voltage V
CC
=4.75V, 0.4 0.4 V
I
SINK
=6.4 mA
Strobe Input “1” Current V
CC
=5.25V, 200 200 µA
(Output Enabled) V
STROBE
=2.4V
Strobe Input “0” Current V
CC
=5.25V, −1.6 −1.6 mA
(Output Disabled) V
STROBE
=0.4V
Strobe Input “0” Voltage V
CC
=4.75V 0.8 0.8 V
Strobe Input “1” Voltage V
CC
=4.75V 2 2 V
Output Short Circuit Current V
CC
=5.25V, V
OUT
=0V −18 −55 −18 −55 mA
V
+
=10V, V−=−10V,
V
CC
=5.25V,
−55˚C≤T
A
≤125˚C
Supply Current I
+
4.5 mA
V
+
=10V, V−=−10V,
V
CC
=5.25V,
0˚C≤T
A
≤70˚C
Supply Current I
+
5mA
V
+
=10V, V−=−10V,
V
CC
=5.25V,
−55˚C≤T
A
≤125˚C
Supply Current I
−
10 mA
LM161/LM361
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Electrical Characteristics (Continued)
(V+= +10V, VCC= +5V, V−= −10V, T
MIN
≤ TA≤ T
MAX
, unless noted)
Limits
Parameter Conditions LM161 LM361 Units
Min Typ Max Min Typ Max
V
+
=10V,
V
−
=−10V,VCC=5.25V,
0˚C≤T
A
≤70˚C
Supply Current I
−
10 mA
V
+
=10V, V−=−10V,
Supply Current I
CC
VCC=5.25V, 18 mA
−55˚C≤T
A
≤125˚C
V
+
=10V, V−=−10V,
Supply Current I
CC
VCC=5.25V, 20 mA
0˚C≤T
A
≤70˚C
Transient Response V
IN
= 50 mV overdrive
(Note 3)
Propagation Delay Time (t
pd(0)
)TA=25˚C 14 20 14 20 ns
Propagation Delay Time (t
pd(1)
)TA=25˚C 14 20 14 20 ns
Delay Between Output A and B T
A
=25˚C 2 5 2 5 ns
Strobe Delay Time (t
pd(0)
)T
A
=25˚C 8 8 ns
Strobe Delay Time (t
pd(1)
)T
A
=25˚C 8 8 ns
Note 1: The device may be damaged by use beyond the maximum ratings.
Note 2: Typical thermal impedances are as follows:
Note 3: Measurements using AC Test circuit, Fanout = 1. The devices are faster at low supply voltages.
Note 4: Refer to RETS161X for LM161H and LM161J military specifications.
Note 5: Human body model, 1.5 kΩ in series with 100 pF.
Typical Performance Characteristics
DS005708-17
Offset Voltage
DS005708-8
Input Currents vs Ambient
Temperature
DS005708-9
Input Characteristics
DS005708-10
LM161/LM361
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Typical Performance Characteristics (Continued)
Supply Current vs
Ambient Temperature
DS005708-11
Supply Current vs
Supply Voltage
DS005708-12
Propagation Delay vs
Ambient Temperature
DS005708-13
Delay of Output 1 With
Respect to Output 2 vs
Ambient Temperature
DS005708-14
Strobe Delay vs Ambient
Temperature
DS005708-15
Common-Mode
Pulse Response
DS005708-16
Propagation Delay vs
Supply Voltage
DS005708-7
LM161/LM361
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AC Test Circuit
DS005708-6
VIN=±50 mV FANOUT = 1 FANOUT = 4
V
+
= +10V R = 2.4k R = 680Ω
V
−
= −10V C=15 pF C = 30 pF
V
CC
= 5.25V
LM161/LM361
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Schematic Diagram
LM161
DS005708-1
R10, R16: 85
R11, R17: 205
LM161/LM361
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Physical Dimensions inches (millimeters) unless otherwise noted
Metal Can Package (H)
Order Number LM161H/883, or LM361H
NS Package Number H10C
Order Number LM361M or LM361MX
NS Package Number M14A
LM161/LM361
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Physical Dimensions inches (millimeters) unless otherwise noted (Continued)
LIFE SUPPORT POLICY
NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT
DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT AND GENERAL
COUNSEL OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein:
1. Life support devices or systems are devices or
systems which, (a) are intended for surgical implant
into the body, or (b) support or sustain life, and
whose failure to perform when properly used in
accordance with instructions for use provided in the
labeling, can be reasonably expected to result in a
significant injury to the user.
2. A critical component is any component of a life
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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Tel: 1-800-272-9959
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www.national.com
Molded Dual-In-Line Package (N)
Order Number LM361N
NS Package Number N14A
LM161/LM361 High Speed Differential Comparators
National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications.
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