LMC6772
Dual Micropower Rail-To-Rail Input CMOS Comparator
with Open Drain Output
General Description
The LMC6772 is an ultra low power dual comparator with a
maximum 10 A/comparator power supply current. It is de-
signed to operate over a wide range of supply voltages, with
a minimum supply voltage of 2.7V.
The common mode voltage range of the LMC6772 exceeds
both the positive and negative supply rails, a significant ad-
vantage in single supply applications. The open drain output
of the LMC6772 allows for wired-OR configurations. The
open drain output also offers the advantage of allowing the
output to be pulled to any voltage rail up to 15V, regardless
of the supply voltage of the LMC6772.
The LMC6772 is targeted for systems where low power con-
sumption is the critical parameter. Guaranteed operation at
supply voltages of 2.7V and rail-to-rail performance makes
this comparator ideal for battery-powered applications.
Refer to the LMC6762 datasheet for a push-pull output stage
version of this device.
Features
(Typical unless otherwise noted)
n
Low power consumption (max):
I
S
= 10 A/comp
n
Wide range of supply voltages:
2.7V to 15V
n
Rail-to-Rail Input Common Mode Voltage Range
n
Open drain output
n
Short circuit protection:
40 mA
n
Propagation delay (
@
V
S
= 5V, 100 mV overdrive):
5 s
Applications
n
Laptop computers
n
Mobile phones
n
Metering systems
n
Hand-held electronics
n
RC timers
n
Alarm and monitoring circuits
n
Window comparators, multivibrators
Connection Diagram
8-Pin DIP/SO/MSOP
DS012347-1
Top View
August 2000
LMC6772
Dual
Micropower
Rail-T
o-Rail
Input
CMOS
Comparator
with
Open
Drain
Output
2000 National Semiconductor Corporation
DS012347
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.
ESD Tolerance (Note 2)
1.5 kV
Differential Input Voltage
(V
+
)+0.3V to (V
-
)-0.3V
Voltage at Input/Output Pin
(V
+
)+0.3V to (V
-
)-0.3V
Supply Voltage (V
+
V
-
)
16V
Current at Input Pin (Note 8)
5 mA
Current at Output Pin (Notes 3, 7)
30 mA
Current at Power Supply Pin, LMC6772
40 mA
Lead Temperature (Soldering, 10 seconds)
260C
Storage Temperature Range
-65C to +150C
Junction Temperature (Note 4)
150C
Operating Ratings
(Note 1)
Supply Voltage
2.7
V
S
15V
Junction Temperature Range
LMC6772AI, LMC6772BI
40C
T
J
+85C
Thermal Resistance (
JA
)
N Package, 8-Pin Molded DIP
100C/W
M Package, 8-Pin Surface Mount
172C/W
2.7V Electrical Characteristics
Unless otherwise specified, all limits guaranteed for T
J
= 25C, V
+
= 2.7V, V
-
= 0V, V
CM
= V
+
/2. Boldface limits apply at the
temperature extremes.
Symbol
Parameter
Conditions
Typ
(Note 5)
LMC6772AI
LMC6772BI
Units
Limit
Limit
(Note 6)
(Note 6)
V
OS
Input Offset Voltage
3
5
15
mV
8
18
max
TCV
OS
Input Offset Voltage
2.0
V/C
Temperature Drift
Input Offset Voltage
(Note 10)
3.3
V/Month
Average Drift
I
B
Input Current
0.02
pA
I
OS
Input Offset Current
0.01
pA
CMRR
Common Mode Rejection Ratio
75
dB
PSRR
Power Supply Rejection Ratio
1.35V
<
V
S
<
7.5V
80
dB
A
V
Voltage Gain
(By Design)
100
dB
V
CM
Input Common-Mode
CMRR
>
55 dB
3.0
2.9
2.9
V
Voltage Range
2.7
2.7
min
-0.3
-0.2
-0.2
V
0.0
0.0
max
V
OL
Output Voltage Low
I
LOAD
= 2.5 mA
0.2
0.3
0.3
V
0.4
0.4
max
I
S
Supply Current
For Both Comparators
12
20
20
A
(Output Low)
25
25
max
I
Leakage
Output Leakage Current
V
IN
(+) = 0.5V,
0.1
500
500
nA
V
IN
(-) = 0V, V
O
= 15V
5.0V and 15.0V Electrical Characteristics
Unless otherwise specified, all limits guaranteed for T
J
= 25C, V
+
= 5.0V and 15.0V, V
-
= 0V, V
CM
= V
+
/2. Boldface limits
apply at the temperature extremes.
Symbol
Parameter
Conditions
Typ
(Note 5)
LMC6772AI
LMC6772BI
Units
Limit
Limit
(Note 6)
(Note 6)
V
OS
Input Offset Voltage
3
5
15
mV
8
18
max
TCV
OS
Input Offset Voltage
V
+
= 5V
2.0
V/C
Temperature Drift
V
+
= 15V
4.0
Input Offset Voltage
V
+
= 5V (Note 10)
3.3
V/Month
Average Drift
V
+
= 15V (Note 10)
4.0
LMC6772
www.national.com
2
5.0V and 15.0V Electrical Characteristics
(Continued)
Unless otherwise specified, all limits guaranteed for T
J
= 25C, V
+
= 5.0V and 15.0V, V
-
= 0V, V
CM
= V
+
/2. Boldface limits
apply at the temperature extremes.
Symbol
Parameter
Conditions
Typ
(Note 5)
LMC6772AI
LMC6772BI
Units
Limit
Limit
(Note 6)
(Note 6)
I
B
Input Current
V = 5V
0.04
pA
I
OS
Input Offset Current
V
+
= 5V
0.02
pA
CMRR
Common Mode
V
+
= 5V
75
dB
Rejection Ratio
V
+
= 15V
82
dB
PSRR
Power Supply Rejection Ratio
2.5V
<
V
S
<
5V
80
dB
A
V
Voltage Gain
(By Design)
100
dB
V
CM
Input Common-Mode
V
+
= 5.0V
5.3
5.2
5.2
V
Voltage Range
CMRR
>
55 dB
5.0
5.0
min
-0.3
-0.2
-0.2
V
0.0
0.0
max
V
+
= 15.0V
15.3
15.2
15.2
V
CMRR
>
55 dB
15.0
15.0
min
-0.3
-0.2
-0.2
V
0.0
0.0
max
V
OL
Output Voltage Low
V
+
= 5V
0.2
0.4
0.4
V
I
LOAD
= 5 mA
0.55
0.55
max
V
+
= 15V
0.2
0.4
0.4
V
I
LOAD
= 5 mA
0.55
0.55
max
I
S
Supply Current
For Both Comparators
12
20
20
A
(Output Low)
25
25
max
I
SC
Short Circuit Current
V
+
= 15V, Sinking, V
O
= 12V
45
mA
(Note 7)
AC Electrical Characteristics
Unless otherwise specified, all limits guaranteed for T
J
= 25C, V
+
= 5V, V
-
= 0V, V
CM
= V
O
= V
+
/2. Boldface limits apply at
the temperature extreme.
Symbol
Parameter
Conditions
Typ
(Note 5)
LMC6772AI
LMC6772BI
Units
Limit
Limit
(Note 6)
(Note 6)
t
RISE
Rise Time
f = 10 kHz, C
L
= 50 pF,
0.3
s
Overdrive = 10 mV (Note 9)
t
FALL
Fall Time
f = 10 kHz, C
L
= 50 pF,
0.3
s
Overdrive = 10 mV (Note 9)
t
PHL
Propagation Delay
f = 10 kHz,
10 mV
10
s
(High to Low)
C
L
= 50 pF
100 mV
4
s
(Note 9)
V
+
= 2.7V,
10 mV
10
s
f = 10 kHz,
C
L
= 50 pF
100 mV
4
s
(Note 9)
LMC6772
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3
AC Electrical Characteristics
(Continued)
Unless otherwise specified, all limits guaranteed for T
J
= 25C, V
+
= 5V, V
-
= 0V, V
CM
= V
O
= V
+
/2. Boldface limits apply at
the temperature extreme.
Symbol
Parameter
Conditions
Typ
(Note 5)
LMC6772AI
LMC6772BI
Units
Limit
Limit
(Note 6)
(Note 6)
t
PLH
Propagation Delay
f = 10 kHz,
10 mV
10
s
(Low to High)
C
L
= 50 pF
100 mV
4
s
(Note 9)
V
+
= 2.7V,
10 mV
8
s
f = 10 kHz,
C
L
= 50 pF
100 mV
4
s
(Note 9)
Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is in-
tended to be functional, but specific performance is not guaranteed. For guaranteed specifications and the test conditions, see the electrical characteristics.
Note 2: Human body model, 1.5 k
in series with 100 pF. The output pins of the two comparators (pin 1 and pin 7) have an ESD tolerance of 1.5 kV. All other pins
have an ESD tolerance of 2 kV.
Note 3: Applies to both single-supply and split-supply operation. Continuous short circuit operation at elevated ambient temperature can result in exceeding the
maximum allowed junction temperature of 150C. Output currents in excess of
30 mA over long term may adversely affect reliability.
Note 4: The maximum power dissipation is a function of T
J(max)
,
JA
, and T
A
. The maximum allowable power dissipation at any ambient temperature is P
D
= (T
J(max)
T
A
)/
JA
. All numbers apply for packages soldered directly into a PC board.
Note 5: Typical Values represent the most likely parametric norm.
Note 6: All limits are guaranteed by testing or statistical analysis.
Note 7: Do not short circuit output to V
+
, when V+ is
>
12V or reliability will be adversely affected.
Note 8: Limiting input pin current is only necessary for input voltages that exceed absolute maximum input voltage ratings.
Note 9: C
L
inlcudes the probe and jig capacitance. The rise time, fall time and propagation delays are measured with a 2V input step.
Note 10: Input offset voltage Average Drift is calculated by dividing the accelerated operating life drift average by the equivalent operational time. The input offset
voltage average drift represents the input offset voltage change at worst-case input conditions.
Typical Performance Characteristics
V
+
= 5V, Single Supply, T
A
= 25C unless otherwise specified
Supply Current vs Supply
Voltage (Output High)
DS012347-3
Supply Current vs Supply
Voltage (Output Low)
DS012347-4
Input Current vs
Common-Mode Voltage
DS012347-5
LMC6772
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4
Typical Performance Characteristics
V
+
= 5V, Single Supply, T
A
= 25C unless otherwise
specified (Continued)
Input Current vs
Common-Mode Voltage
DS012347-6
Input Current vs
Common-Mode Voltage
DS012347-7
Input Current
vs Temperature
DS012347-8
V
OS
vs
V
CM
V
S
= 2.7V
DS012347-9
V
OS
vs
V
CM
V
S
= 5V
DS012347-10
V
OS
vs
V
CM
V
S
= 15V
DS012347-11
Output Voltage vs
Output Current (Sinking)
DS012347-12
Output Voltage vs
Output Current (Sinking)
DS012347-13
Output Voltage vs
Output Current (Sinking)
DS012347-14
LMC6772
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5
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