LM161,LM361
LM161/LM361 High Speed Differential Comparators
Literature Number: SNOSBJ5B
LM161/LM361
High Speed Differential Comparators
General Description
The LM161/LM361 is a very high speed differential input,
complementary TTL output voltage comparator with im-
proved characteristics over the SE529/NE529 for which it is
a pin-for-pin replacement. The device has been optimized for
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 pro-
vided. Applications involve high speed analog to digital con-
verters and zero-crossing detectors in disk file systems.
Features
nIndependent strobes
nGuaranteed high speed: 20 ns max
nTight delay matching on both outputs
nComplementary TTL outputs
nOperates from op amp supplies: ±15V
nLow speed variation with overdrive variation
nLow input offset voltage
nVersatile supply voltage range
Connection Diagrams
Dual-In-Line Package
00570802
Top View
Order Number LM361M, LM361MX or LM361N
See NS Package Number M14A or N14A
Metal Can Package
00570803
Order Number LM161H/883 or LM361H
See NS Package Number H10C
Logic Diagram
00570804
*Output is low when current is drawn from strobe pin.
August 2000
LM161/LM361 High Speed Differential Comparators
© 2004 National Semiconductor Corporation DS005708 www.national.com
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
Min Typ Max
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 and Their Effect on
Product Reliability” for other methods of soldering surface
mount devices.
Electrical Characteristics
(V
+
= +10V, V
CC
= +5V, V
−
= −10V, T
MIN
≤T
A
≤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
LM161/LM361
www.national.com 2
Electrical Characteristics (Continued)
(V
+
= +10V, V
CC
= +5V, V
−
= −10V, T
MIN
≤T
A
≤T
MAX
, unless noted)
Limits
Parameter Conditions LM161 LM361 Units
Min Typ Max Min Typ Max
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
V
+
=10V,
V
−
=−10V,V
CC
=5.25V,
0˚C≤T
A
≤70˚C
Supply Current I
−
10 mA
V
+
=10V, V
−
=−10V,
Supply Current I
CC
V
CC
=5.25V, 18 mA
−55˚C≤T
A
≤125˚C
V
+
=10V, V
−
=−10V,
Supply Current I
CC
V
CC
=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)
)T
A
=25˚C 14 20 14 20 ns
Propagation Delay Time (t
pd(1)
)T
A
=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:
00570817
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 kΩin series with 100 pF.
LM161/LM361
www.national.com3
Typical Performance Characteristics
Offset Voltage
Input Currents vs Ambient
Temperature
00570808 00570809
Input Characteristics
Supply Current vs
Ambient Temperature
00570810 00570811
Supply Current vs
Supply Voltage
Propagation Delay vs
Ambient Temperature
00570812 00570813
LM161/LM361
www.national.com 4
Typical Performance Characteristics (Continued)
Delay of Output 1 With
Respect to Output 2 vs
Ambient Temperature
Strobe Delay vs Ambient
Temperature
00570814 00570815
Common-Mode
Pulse Response
Propagation Delay vs
Supply Voltage
00570816 00570807
AC Test Circuit
00570806
V
IN
=±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
www.national.com5
Schematic Diagram
LM161
00570801
R10, R16: 85
R11, R17: 205
LM161/LM361
www.national.com 6
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
www.national.com7
Physical Dimensions inches (millimeters) unless otherwise noted (Continued)
Molded Dual-In-Line Package (N)
Order Number LM361N
NS Package Number N14A
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.
For the most current product information visit us at www.national.com.
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NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS
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LM161/LM361 High Speed Differential Comparators
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