LMC7211
Tiny CMOS Comparator with Rail-to-Rail Input and
Push-Pull Output
General Description
The LMC7211 is a micropower CMOS comparator available
in the space saving SOT23-5 package. This makes the com-
parator ideal for space and weight critical designs. The
LMC7211 is supplied in two offset voltage grades, 5 mV and
15 mV.
The main benefits of the Tiny package are most apparent in
small portable electronic devices, such as mobile phones,
pagers, notebook computers, personal digital assistants,
and PCMCIA cards. The rail-to-rail input voltage makes the
LMC7211 a good choice for sensor interfacing, such as light
detector circuits, optical and magnetic sensors, and alarm
and status circuits.
The Tiny Comparator's outside dimensions (length x width x
height) of 3.05mm x 3.00mm x 1.43mm allow it to fit into tight
spaces on PC boards.
Features
n
Tiny SOT 23-5 package saves space
n
Package is less than 1.43 mm thick
n
Guaranteed specs at 2.7V, 5V, 15V supplies
n
Typical supply current 7 A at 5V
n
Response time of 4 s at 5V
n
LMC7211 -- push-pull output
n
Input common-mode range beyond V- and V+
n
Low input current
Applications
n
Battery Powered Products
n
Notebooks and PDAs
n
PCMCIA cards
n
Mobile Communications
n
Alarm and Security circuits
n
Direct Sensor Interface
n
Replaces amplifiers used as comparators with better
performance and lower current
Connection Diagrams
Package
Ordering
NSC Drawing
Package
Transport Media
Information
Number
Marking
8-Pin SO-8
LMC7211AIM
M08A
LM7211AIM
Rails
LMC7211AIMX
M08A
LM7211AIM
2.5k Units Tape and Reel
LMC7211BIM
M08A
LM7211BIM
Rails
LMC7211BIMX
M08A
LM7211BIM
2.5k Units tape and Reel
5-Pin SOT 23-5
LMC7211AIM5
MA05A
C00A
1k Units Tape and Reel
LMC7211AIM5X
MA05A
C00A
3k Units Tape and Reel
LMC7211BIM5
MA05A
C00B
1k Units Tape and Reel
LMC7211BIM5X
MA05A
C00B
3k Units Tape and Reel
8-Pin SO-8
DS012337-1
Top View
5-Pin SOT23-5
DS012337-2
Top View
September 1999
LMC721
1
T
iny
CMOS
Comparator
with
Rail-to-Rail
Input
and
Push-Pull
Output
1999 National Semiconductor Corporation
DS012337
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
CC
) +0.3V to (-V
CC
)-0.3V
Voltage at Input/Output Pin
(V
CC
) + 0.3V to (-V
CC
)-0.3V
Supply Voltage (V
+
V
-
)
16V
Current at Input Pin (Note 7)
5 mA
Current at Output Pin
(Notes 3, 8)
30 mA
Current at Power Supply Pin
40 mA
Lead Temperature
(soldering, 10 sec)
260C
Storage Temperature Range
-65C to +150C
Junction Temperature
(Note 4)
150C
Operating Ratings
(Note 1)
Supply Voltage
2.7
V
CC
15V
Junction Temperature Range
LMC7211AI, LMC7211BI
-40C
T
J
+85C
Thermal Resistance (
JA
)
SO-8 Package,
8-Pin Surface Mount
180C/W
M05A Package,
5-Pin Surface Mount
325C/W
2.7V Electrical Characteristics
Unless otherwise specified, all limits guaranteed for T
J
= 25C, V
+
= 2.7V, V
-
= 0V, V
CM
= V
O
= V+/2. Boldface limits apply
at the temperature extremes.
Typ
LMC7211AI
LMC7211BI
Symbol
Parameter
Conditions
(Note 5)
Limit
Limit
Units
(Note 6)
(Note 6)
V
OS
Input Offset Voltage
3
5
15
mV
8
18
max
TCV
OS
Input Offset Voltage
1.0
V/C
Temperature Drift
Input Offset Voltage
(Note 10)
3.3
V/Month
Average Drift
I
B
Input Current
0.04
pA
I
OS
Input Offset Current
0.02
pA
CMRR
Common Mode
0V
V
CM
2.7V
75
dB
Rejection Ratio
PSRR
Power Supply
2.7V
V
+
15V
80
dB
Rejection Ratio
A
V
Voltage Gain
100
dB
CMVR
Input Common-Mode
CMRR
>
55 dB
3.0
2.9
2.9
V
Voltage Range
2.7
2.7
min
CMRR
>
55 dB
-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
V
OUT
= Low
7
12
12
A
14
14
max
5.0V and 15.0V Electrical Characteristics
Unless otherwise specified, all limits guaranteed for T
J
= 25C, V
+
= 5.0V and 15V, V
-
= 0V, V
CM
= V
O
= V
+
/2. Boldface lim-
its apply at the temperature extremes.
Typ
LMC7211AI
LMC7211BI
Symbol
Parameter
Conditions
(Note 5)
Limit
Limit
Units
(Note 6)
(Note 6)
V
OS
Input Offset Voltage
3
5
15
mV
8
18
max
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 15V, V
-
= 0V, V
CM
= V
O
= V
+
/2. Boldface lim-
its apply at the temperature extremes.
Typ
LMC7211AI
LMC7211BI
Symbol
Parameter
Conditions
(Note 5)
Limit
Limit
Units
(Note 6)
(Note 6)
TCV
OS
Input Offset Voltage
V
+
= 5V
1.0
V/C
Temperature Drift
V
+
= 15V
4.0
Input Offset Voltage
V
+
= 5V
3.3
V/Month
Average Drift
V
+
= 15V
4.0
I
B
Input Current
0.04
pA
I
OS
Input Offset Current
0.02
pA
CMRR
Common Mode
V+ = 5.0V
75
dB
Rejection Ration
V+ = 15.0V
82
dB
PSRR
Power Supply
5V
V
+
10V
80
dB
Rejection Ratio
A
V
Voltage Gain
100
dB
CMVR
Input Common-Mode
V+ = 5.0V
5.3
5.2
5.2
V
Voltage Range
CMRR
>
55 dB
5.0
5.0
min
V+ = 5.0V
-0.3
-0.2
-0.2
V
CMRR
>
55 dB
0.0
0.0
max
V+ = 15.0V
15.3
15.2
15.2
V
CMRR
>
55 dB
15.0
15.0
min
V+ = 15.0V
-0.3
-0.2
-0.2
V
CMRR
>
55 dB
0.0
0.0
max
V
OH
Output Voltage High
V+ = 5V
4.8
4.6
4.6
mV
I
load
= 5 mA
4.45
4.45
min
V+ = 15V
14.8
14.6
14.6
mV
I
load
= 5 mA
14.45
14.45
min
V
OL
Output Voltage Low
V+ = 5V
0.2
0.40
0.40
mV
I
load
= 5 mA
0.55
0.55
max
V+ = 15V
0.2
0.40
0.40
mV
I
load
= 5 mA
0.55
0.55
max
I
S
Supply Current
V
OUT
= Low
7
14
14
A
18
18
max
I
SC
Short Circuit Current
Sourcing
30
mA
Sinking (Note 8)
45
mA
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.
Typ
LMC7211AI
LMC7211BI
Symbol
Parameter
Conditions
(Note 5)
Limit
Limit
Units
(Note 6)
(Note 6)
t
rise
Rise Time
f = 10 kHz, Cl = 50 pF,
0.3
s
Overdrive = 10 mV (Note 9)
t
fall
Fall Time
f = 10 kHz, Cl = 50 pF,
0.3
s
Overdrive = 10 mV (Note 9)
www.national.com
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.
Typ
LMC7211AI
LMC7211BI
Symbol
Parameter
Conditions
(Note 5)
Limit
Limit
Units
(Note 6)
(Note 6)
t
PHL
Propagation Delay
f = 10 kHz,
10 mV
10
s
(High to Low)
Cl = 50 pF
100 mV
4
(Note 11)
(Note 9)
V+ = 2.7V,
10 mV
10
s
f = 10 kHz,
100 mV
4
Cl = 50 pF
(Note 9)
t
PLH
Propagation Delay
f = 10 kHz,
10 mV
6
s
(Low to High)
Cl = 50p
100 mV
4
(Note 11)
(Note 9)
V+ = 2.7V,
10 mV
7
s
f = 10 kHz,
100 mV
4
Cl = 50 pF
(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.
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: Limiting input pin current is only necessary for input voltages that exceed absolute maximum input voltage rating.
Note 8: Do not short circuit output to V+, when V+ is greater than 12V or reliability will be adversely affected.
Note 9: C
L
includes the probe and jig capacitance.
Note 10: Input offset voltage average drift is calculated by dividing the accelerated operating life V
OS
drift by the equivalent operational time. This represents worst
case input conditions and includes the first 30 days of drift.
Note 11: Input step voltage for propagation delay measurement is 2V.
Typical Performance Characteristics
Single Supply T
A
= 25C unless specified
Supply Current vs
Supply Voltage
DS012337-15
Supply Current vs
Temperature while Sourcing
DS012337-16
Supply Current vs
Temperature while Sinking
DS012337-17
www.national.com
4
Typical Performance Characteristics
Single Supply T
A
= 25C unless specified (Continued)
Output Sourcing Current vs
Supply Voltage
DS012337-18
Output Sinking Current vs
Supply Voltage
DS012337-19
Output Sourcing Current vs
Output Voltage
@
5V
DS012337-20
Output Sinking Current vs
Output Voltage
@
5V
DS012337-21
Output Sourcing Current vs
Output Voltage
@
15V
DS012337-22
Output Sinking Current vs
Output Voltage
@
15V
DS012337-23
Response Time for Various
Input Overdrives -t
PLH
DS012337-24
Response Time for Various
Input Overdrives -t
PHL
DS012337-25
www.national.com
5
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