LM161/LM261/LM361
High Speed Differential Comparators
General Description
The LM161/LM261/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. The device has been optimized
for greater speed performance and lower input offset volt-
age. 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
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
Dual-In-Line Package
DS005708-2
Top View
Order Number LM161J
LM361M or LM361N
See NS Package Number M14A or N14A
Metal Can Package
DS005708-3
Order Number LM161H/883 (Note 1), or LM361H
See NS Package Number H10C
Note 1: Also available per SMD #5962-8757203
May 1999
LM161/LM261/LM361
High
Speed
Differential
Comparators
1999 National Semiconductor Corporation
DS005708
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Logic Diagram
DS005708-4
*
Output is low when current is drawn from strobe pin.
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2
Absolute Maximum Ratings
(Note 2)
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
-65C to +150C
Operating Temperature Range
T
MIN
T
MAX
LM161
-55C to +125C
LM261
-25C to +85C
LM361
0C to +70C
Lead Temp. (Soldering, 10 seconds)
260C
For Any Device Lead Below V
-
0.3V
Operating Conditions
Min
Typ
Max
Supply Voltage V
+
LM161/LM261
5V
15V
LM361
5V
15V
Supply Voltage V
-
LM161/LM261
-6V
-15V
LM361
-6V
-15V
Supply Voltage V
CC
LM161/LM261
4.5V
5V
5.5V
LM361
4.75V
5V
5.25V
ESD Tolerance (Note 6)
1600V
Soldering Information
Dual-In-Line Package
Soldering (10 seconds)
260C
Small Outline Package
Vapor Phase (60 seconds)
215C
Infrared (15 seconds)
220C
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/LM261
LM361
Units
Min
Typ
Max
Min
Typ
Max
Input Offset Voltage
1
3
1
5
mV
Input Bias Current
T
A
=25C
5
10
A
20
30
A
Input Offset Current
T
A
=25C
2
2
A
3
5
A
Voltage Gain
T
A
=25C
3
3
V/mV
Input Resistance
T
A
=25C, f=1 kHz
20
20
k
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
A
(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,
-55C
T
A
125C
Supply Current I
+
4.5
mA
V
+
=10V, V
-
=-10V,
V
CC
=5.25V,
0C
T
A
70C
Supply Current I
+
5
mA
V
+
=10V, V
-
=-10V,
V
CC
=5.25V,
-55C
T
A
125C
Supply Current I
-
10
mA
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3
Electrical Characteristics
(Continued)
(V
+
= +10V, V
CC
= +5V, V
-
= -10V, T
MIN
T
A
T
MAX
, unless noted)
Limits
Parameter
Conditions
LM161/LM261
LM361
Units
Min
Typ
Max
Min
Typ
Max
V
+
=10V,
V
-
=-10V,V
CC
=5.25V,
0C
T
A
70C
Supply Current I
-
10
mA
V
+
=10V, V
-
=-10V,
Supply Current I
CC
V
CC
=5.25V,
18
mA
-55C
T
A
125C
V
+
=10V, V
-
=-10V,
Supply Current I
CC
V
CC
=5.25V,
20
mA
0C
T
A
70C
Transient Response
V
IN
= 50 mV overdrive
(Note 4)
Propagation Delay Time (t
pd(0)
)
T
A
=25C
14
20
14
20
ns
Propagation Delay Time (t
pd(1)
)
T
A
=25C
14
20
14
20
ns
Delay Between Output A and B
T
A
=25C
2
5
2
5
ns
Strobe Delay Time (t
pd(0)
)
T
A
=25C
8
8
ns
Strobe Delay Time (t
pd(1)
)
T
A
=25C
8
8
ns
Note 2: The device may be damaged by use beyond the maximum ratings.
Note 3: Typical thermal impedances are as follows:
Note 4: Measurements using AC Test circuit, Fanout = 1. The devices are faster at low supply voltages.
Note 5: Refer to RETS161X for LM161H and LM161J military specifications.
Note 6: Human body model, 1.5 k
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
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4
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
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5
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