LMC6762
Dual MicroPower Rail-To-Rail Input CMOS Comparator
with Push-Pull Output
General Description
The LMC6762 is an ultra low power dual comparator with a
maximum supply current of 10 A/comparator. It is designed
to operate over a wide range of supply voltages, from 2.7V to
15V. The LMC6762 has guaranteed specs at 2.7V to meet
the demands of 3V digital systems.
The LMC6762 has an input common-mode voltage range
which exceeds both supplies. This is a significant advantage
in low-voltage applications. The LMC6762 also features a
push-pull output that allows direct connections to logic de-
vices without a pull-up resistor.
A quiescent
power
consumption
of
50
W/amplifier
(
@
V
+
= 5V) makes the LMC6762 ideal for applications in
portable phones and hand-held electronics. The ultra-low
supply current is also independent of power supply voltage.
Guaranteed operation at 2.7V and a rail-to-rail performance
makes this device ideal for battery-powered applications.
Refer to the LMC6772 datasheet for an open-drain 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
Rail-to-rail output swing (Within 100 mV of the supplies,
@
V
+
= 2.7V, and I
LOAD
= 2.5 mA)
n
Short circuit protection:
40 mA
n
Propagation delay
(
@
V
+
= 5V, 100 mV
overdrive):
4 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
DS012320-1
Top View
Typical Application
DS012320-16
Zero Crossing Detector
August 2000
LMC6762
Dual
MicroPower
Rail-T
o-Rail
Input
CMOS
Comparator
with
Push-Pull
Output
2000 National Semiconductor Corporation
DS012320
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)
2 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
5 mA
Current at Output Pin
(Notes 7, 3)
30 mA
Current at Power Supply Pin,
LMC6762
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
LMC6762AI, LMC6762BI
-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)
LMC6762AI
LMC6762BI
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 8)
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
OH
Output Voltage High
I
LOAD
= 2.5 mA
2.5
2.4
2.4
V
2.3
2.3
min
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
LMC6762
www.national.com
2
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)
LMC6762AI
LMC6762BI
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 8)
3.3
V/Month
Average Drift
V
+
= 15V (Note 8)
4.0
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
OH
Output Voltage High
V
+
= 5V
4.8
4.6
4.6
V
I
LOAD
= 5mA
4.45
4.45
min
V
+
= 15V
14.8
14.6
14.6
V
I
LOAD
= 5 mA
14.45
14.45
min
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
Sourcing
30
mA
Sinking, V
O
= 12V
45
(Note 7)
LMC6762
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3
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)
LMC6762AI
LMC6762BI
Units
Limit
Limit
(Note 6)
(Note 6)
t
RISE
Rise Time
f = 10 kHz, C
L
= 50 pF,
0.3
s
Overdrive = 10 mV (Notes 9, 10)
t
FALL
Fall Time
f = 10 kHz, C
L
= 50 pF,
0.3
s
Overdrive = 10 mV (Notes 9, 10)
t
PHL
Propagation Delay
f = 10 kHz,
Overdrive = 10 mV
10
s
(High to Low)
C
L
= 50 pF
Overdrive = 100 mV
4
s
(Notes 9, 10)
V
+
= 2.7V,
Overdrive = 10 mV
10
s
f = 10 kHz,
C
L
= 50 pF
Overdrive = 100 mV
4
s
(Notes 9, 10)
t
PLH
Propagation Delay
f = 10 kHz,
Overdrive = 10 mV
6
s
(Low to High)
C
L
= 50 pF
Overdrive = 100 mV
4
s
(Notes 9, 10)
V
+
= 2.7V,
Overdrive = 10 mV
7
s
f = 10 kHz,
C
L
= 50 pF
Overdrive = 100 mV
4
s
(Notes 9, 10)
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.
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 greater than 12V or reliability will be adversely affected.
Note 8: 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.
Note 9: C
L
includes the probe and jig capacitance.
Note 10: The rise and fall times are measured with a 2V input step. The propagation delays are also measured with a 2V input step.
Typical Performance Characteristics
V
+
= 5V, Single Supply, T
A
= 25C unless otherwise specified
Supply Current vs Supply
Voltage (Output High)
DS012320-20
Supply Current vs Supply
Voltage (Output Low)
DS012320-21
Input Current vs
Common-Mode Voltage
DS012320-22
LMC6762
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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
DS012320-23
Input Current vs
Common-Mode Voltage
DS012320-24
Input Current
vs Temperature
DS012320-25
V
OS
vs
V
CM
DS012320-26
V
OS
vs
V
CM
DS012320-27
V
OS
vs
V
CM
DS012320-28
Output Voltage vs
Output Current (Sourcing)
DS012320-29
Output Voltage vs
Output Current (Sourcing)
DS012320-30
Output Voltage vs
Output Current (Sourcing)
DS012320-31
LMC6762
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5
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