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LTC1440/LTC1441/LTC1442
Ultralow Power Single/Dual
Comparator with Reference
V
+
R1
1.65M
1%
R2
1.13M
1%
3.3V
V
2
1
7
8
GND
OUT
LTC1440
1440 TA01
IN
+
IN
HYST
REF
3
4
5
6
+
TEMPERATURE (
C)
40
5.0
4.5
4.0
3.5
3.0
2.5
2.0
1.5
20
60
1440/1/2 TA02
20
0
40
80
100
SUPPLY CURRENT (
A)
V
+
= 5V
V
= GND = 0V
TYPICAL APPLICATIO
N
U
Micropower 2.9V V
CC
Threshold Detector
LTC1440 Supply Current vs Temperature
The LTC
1440/LTC1441/LTC1442 are ultralow power
single and dual comparators with built-in references. The
comparators feature less than 3.7
A supply current over
temperature (LTC1440), a 1.182V
1% reference, pro-
grammable hysteresis (LTC1440/LTC1442) and TTL/CMOS
outputs that sink and source current. The reference output
can drive a bypass capacitor of up to 0.01
F without
oscillation.
The comparators operate from a single 2V to 11V supply
or a dual
1V to
5.5V supply (LTC1440). Comparator
hysteresis is easily programmed by using two resistors
and the HYST pin (LTC1440/LTC1442). Each comparator's
input operates from the negative supply to within 1.3V of
the positive supply. The comparator output stage can
continuously source up to 40mA. By eliminating the
cross-conducting current that normally happens when the
comparator changes logic states, the power supply glitches
are eliminated.
The LTC1440 is available in 8-pin PDIP, SO and MSOP
packages. The LTC1441/LTC1442 are available in 8-pin
PDIP and SO packages.
FEATURES
DESCRIPTIO
N
U
s
Battery-Powered System Monitoring
s
Threshold Detectors
s
Window Comparators
s
Oscillator Circuits
APPLICATIO
N
S
U
, LTC and LT are registered trademarks of Linear Technology Corporation.
s
Ultralow Quiescent Current: 2.1
A Typ (LTC1440)
s
Wide Supply Range:
Single: 2V to 11V
Dual:
1V to
5.5V
s
Input Voltage Range Includes the Negative Supply
s
Reference Output Drives 0.01
F Capacitor
s
Adjustable Hysteresis (LTC1440/LTC1442)
s
TTL/CMOS Compatible Outputs
s
12
s Propagation Delay with 10mV Overdrive
s
No Crowbar Current
s
40mA Continuous Source Current
s
Pin Compatible Upgrades for MAX921/922/923
2
LTC1440/LTC1441/LTC1442
Voltage
V
+
to V
, V
+
to GND, GND to V
...........12V to 0.3V
IN
+
, IN
, HYST ................. (V
+
+ 0.3V) to (V
0.3V)
REF ................................... (V
+
+ 0.3V) to (V
0.3V)
OUT (LTC1440) .............. (V
+
+ 0.3V) to (GND 0.3V)
OUT (LTC1441/LTC1442) ... (V
+
+ 0.3V) to (V
0.3V)
Current
IN
+
, IN
, HYST ................................................. 20mA
REF ................................................................... 20mA
OUT .................................................................. 50mA
ABSOLUTE
M
AXI
M
U
M
RATINGS
W
W
W
U
OUT Short-Circuit Duration (V
+
5.5V) ...... Continuous
Power Dissipation ............................................. 500mW
Operating Temperature Range
LTC144XC .............................................. 0
C to 70
C
LTC144XI .......................................... 40
C to 85
C
Storage Temperature Range ................ 65
C to 150
C
Lead Temperature (Soldering, 10 sec).................. 300
C
PACKAGE/ORDER I
N
FOR
M
ATIO
N
W
U
U
T
JMAX
= 150
C,
JA
= 130
C/ W (N8)
T
JMAX
= 150
C,
JA
= 175
C/ W (S8)
1
2
3
4
8
7
6
5
TOP VIEW
GND
V
IN
+
IN
OUT
V
+
REF
HYST
S8 PACKAGE
8-LEAD PLASTIC SO
N8 PACKAGE
8-LEAD PDIP
ORDER PART NUMBER
ORDER PART NUMBER
LTC1440CN8
LTC1440CS8
LTC1440IN8
LTC1440IS8
LTC1440CMS8
S8 PART MARKING
MS8 PART MARKING
1440
1440I
LTBX
ORDER PART NUMBER
ORDER PART NUMBER
LTC1441CN8
LTC1441CS8
LTC1441IN8
LTC1441IS8
LTC1442CN8
LTC1442CS8
LTC1442IN8
LTC1442IS8
S8 PART MARKING
S8 PART MARKING
1441
1441I
1442
1442I
T
JMAX
= 150
C,
JA
= 130
C/ W (N8)
T
JMAX
= 150
C,
JA
= 175
C/ W (S8)
T
JMAX
= 150
C,
JA
= 130
C/ W (N8)
T
JMAX
= 150
C,
JA
= 175
C/ W (S8)
1
2
3
4
8
7
6
5
TOP VIEW
OUT A
V
IN A
+
IN A
OUT B
V
+
IN B
+
IN B
S8 PACKAGE
8-LEAD PLASTIC SO
N8 PACKAGE
8-LEAD PDIP
1
2
3
4
8
7
6
5
TOP VIEW
OUT A
V
IN A
+
IN B
OUT B
V
+
REF
HYST
S8 PACKAGE
8-LEAD PLASTIC SO
N8 PACKAGE
8-LEAD PDIP
Consult factory for Military grade parts.
V
+
= 5V, V
= GND = 0V, T
A
= 25
C unless otherwise noted.
ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Power Supply
V
+
Supply Voltage Range
q
2.0
11.0
V
I
CC
Supply Current
IN
+
= IN
= 80mV
LTC1440
q
2.1
3.7
A
HYST = REF (LTC1440/LTC1442)
LTC1441
q
3.5
5.7
A
LTC1442
q
3.5
5.7
A
1
2
3
4
GND
V
IN
+
IN
8
7
6
5
OUT
V
+
REF
HYST
TOP VIEW
MS8 PACKAGE
8-LEAD PLASTIC MSOP
T
JMAX
= 150
C,
JA
= 250
C/ W
3
LTC1440/LTC1441/LTC1442
V
+
= 5V, V
= GND = 0V, T
A
= 25
C unless otherwise noted.
ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Comparator
V
OS
Comparator Input Offset Voltage
V
CM
= 2.5V
q
3
10
mV
I
IN
Input Leakage Current (IN
+
, IN
)
V
IN
+
= V
IN
= 2.5V
q
0.01
1.0
nA
Input Leakage Current (HYST)
q
0.02
1.0
nA
V
CM
Comparator Input Common Mode Range
q
V
V
+
1.3V
V
CMRR
Common Mode Rejection Ratio
V
to V
+
1.3V
0.1
1
mV/V
PSRR
Power Supply Rejection Ratio
V
+
= 2V to 11V
0.1
1
mV/V
NOISE
Voltage Noise
100Hz to 100kHz
100
V
RMS
V
HYST
Hysteresis Input Voltage Range
LTC1440/LTC1442
q
REF 50mV
REF
V
t
PD
Propagation Delay
C
OUT
= 100pF
Overdrive = 10mV
15
s
Overdrive = 100mV
8
s
V
OH
Output High Voltage
I
O
= 13mA
q
V
+
0.4V
V
V
OL
Output Low Voltage
I
O
= 1.8mA
LTC1440
q
GND + 0.4V
V
LTC1441/LTC1442
q
V
+ 0.4V
V
Reference
V
REF
Reference Voltage
No Load
C Temp Range
q
1.170
1.182
1.194
V
LTC1440/LTC1442
I Temp Range
q
1.164
1.200
V
No Load LTC1440 (MSOP)
C Temp Range
q
1.164
1.200
V
I
SOURCE
Reference Output Source Current
V
REF
1mV (LTC1442)
q
100
200
A
I
SINK
Reference Output Sink Current
V
REF
2.5mV (LTC1442)
10
20
A
V
REF
Reference Source Current
0
I
SOURCE
2mA (LTC1440)
q
0.8
5
mV
Reference Sink Current
0
I
SINK
10
A (LTC1440)
0.5
1.5
mV
q
5
mV
NOISE
Voltage Noise
100Hz to 100kHz
100
V
RMS
V
+
= 3V, V
= GND = 0V, T
A
= 25
C unless otherwise noted.
Power Supply
V
+
Supply Voltage Range
q
2
11
V
I
CC
Supply Current
IN
+
= IN
= 80mV
LTC1440
q
2
3.6
A
HYST = REF (LTC1440/LTC1442)
LTC1441
q
3.5
5.7
A
LTC1442
q
3.5
5.7
A
Comparator
V
OS
Comparator Input Offset Voltage
V
CM
= 1.5V
q
3
10
mV
I
IN
Input Leakage Current (IN
+
, IN
)
V
IN
+
= V
IN
= 1.5V
q
0.01
1
nA
Input Leakage Current (HYST)
q
0.02
1
nA
V
CM
Comparator Input Common Mode Range
q
V
V
+
1.3V
V
CMRR
Common Mode Rejection Ratio
V
to V
+
1.3V
0.1
1
mV/V
PSRR
Power Supply Rejection Ratio
V
+
= 2V to 11V
0.1
1
mV/V
NOISE
Voltage Noise
100Hz to 100kHz
100
V
RMS
V
HYST
Hysteresis Input Voltage Range
LTC1440/LTC1442
q
REF 50mV
REF
V
t
PD
Propagation Delay
C
OUT
= 100pF
Overdrive = 10mV
14
s
Overdrive = 100mV
5
s
V
OH
Output High Voltage
I
O
= 8mA
q
V
+
0.4V
V
V
OL
Output Low Voltage
I
O
= 0.8mA
LTC1440
q
GND + 0.4V
V
LTC1441/LTC1442
q
V
+ 0.4V
V
4
LTC1440/LTC1441/LTC1442
Comparator Response Time vs
Input Overdrive
RESPONSE TIME (
s)
1
INPUT VOLTAGE (mV)
OUTPUT VOLTAGE (V)
0
0
1
6
14
18
5
1440/1/2 G02
100
2
10
4
12
16
0
8
2
3
4
100mV
10mV
50mV
20mV
T
A
= 25
C
RESPONSE TIME (
s)
1
INPUT VOLTAGE (mV)
OUTPUT VOLTAGE (V)
100
0
1
6
4
5
1440/1/2 G01
0
2
0
10
8
2
3
4
100mV
10mV
50mV
20mV
T
A
= 25
C
Comparator Response Time vs
Input Overdrives
Comparator Short-Circuit Sink
Current vs Supply Voltage
SUPPLY VOLTAGE (V)
0
SINK CURRENT (mA)
200
180
160
140
120
100
80
60
40
20
0
8
1440/1/2 G03
2
1
3
5
7
9
4
6
10
OUT CONNECTED TO V
+
T
A
= 25
C
Comparator Short-Circuit Source
Current vs Supply Voltage
Comparator Response Time at
Low Supply Voltage
Comparator Response Time vs
Load Capacitance with 100mV
Input Overdrive
ELECTRICAL CHARACTERISTICS
The
q
denotes specifications which apply over the full operating
temperature range.
SYMBOL PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Reference
V
REF
Reference Voltage
No Load
C Temp Range
q
1.170
1.182
1.194
V
LTC1440/LTC1442
I Temp Range
q
1.164
1.200
V
No Load LTC1440 (MSOP)
C Temp Range
q
1.164
1.200
V
I
SOURCE
Reference Output Source Current
V
REF
1mV (LTC1442)
q
60
120
A
I
SINK
Reference Output Sink Current
V
REF
2.5mV (LTC1442)
10
20
A
V
REF
Reference Source Current
0
I
SOURCE
1mA (LTC1440)
q
0.8
5.5
mV
Reference Sink Current
0
I
SINK
10
A (LTC1440)
0.5
1.5
mV
q
5
mV
NOISE
Voltage Noise
100Hz to 100kHz
100
V
RMS
V
+
= 3V, V
= GND = 0V, T
A
= 25
C unless otherwise noted.
TYPICAL PERFOR
M
A
N
CE CHARACTERISTICS
U
W
SUPPLY VOLTAGE (V)
0
SOURCE CURRENT (mA)
3
5
1440/1/2 G04
1
2
4
160
140
120
100
80
60
40
20
0
OUT CONNECTED TO
V
= GND = 0V
LOAD CAPACITANCE (nF)
0
RESPONSE TIME (
s)
12
10
8
6
4
2
80
1440/1/2 G05
20
40
60
100
t
PHL
t
PLH
SUPPLY VOLTAGE (V)
1.0
RESPONSE TIME (
s)
10000
1000
100
10
1
1.2
1.4
1.6
1.1
1.3
1.5
1440/1/2 G06
20mV OVERDRIVE
100mV OVERDRIVE
5
LTC1440/LTC1441/LTC1442
TYPICAL PERFOR
M
A
N
CE CHARACTERISTICS
U
W
LOAD CURRENT (mA)
0
1
OUTPUT VOLTAGE HIGH (V)
2
3
4
5
10
20
30
40
1440/1/2 G07
50
60
V
+
= 5V
V
+
= 3V
V
+
= 2V
T
A
= 25
C
Comparator Output Voltage High
vs Load Current
Comparator Output Voltage Low
vs Load Current
LOAD CURRENT (mA)
0
OUTPUT VOLTAGE HIGH (V)
1.5
2.0
2.5
30
50
80
1440/1/2 G08
1.0
0.5
0
10
20
40
60
70
V
+
= 2V
V
+
= 3V
V
+
= 5V
T
A
= 25
C
LTC1440/LTC1442
Hysteresis Control
TEMPERATURE (
C)
60
SUPPLY CURRENT (
A)
6
5
4
3
2
1
100
1440/1/2 G10
20
40
20 40
80
120
0
60
140
V
+
= 5V
V
= 5V
V
+
= 5V
V
= GND = 0V
V
+
= 3V
V
= GND = 0V
LTC1440
Supply Current vs Temperature
OUTPUT LOAD CURRENT (mA)
0
1.190
1.185
1.180
1.175
1.170
1.165
1.160
1.155
1.5
2.5
1440/1/2 G11
0.5
1.0
2.0
3.0
3.5
REFERENCE OUTPUT VOLTAGE (V)
V
CC
= 5V
SOURCE
Reference Output Voltage vs
Output Load Current
OUTPUT LOAD CURRENT (
A)
0
REFERENCE OUTPUT VOLTAGE (V)
1.200
1.195
1.190
1.185
1.180
1.175
1.170
5
10
15
20
1440/1/2 G12
25
30
V
CC
= 5V
SINK
V
CC
= 2V
Reference Output Voltage vs
Output Load Current (Sink)
Reference Voltage vs
Temperature
V
REF
V
HYST
(mV)
0
POSITIVE-TO-NEGATIVE INPUT VOLTAGE (mV)
30
50
1440/1/2 G09
10
20
40
80
60
40
20
0
20
40
60
80
OUTPUT HIGH
OUTPUT LOW
TEMPERATURE (
C)
60
REFERENCE VOLTAGE (V)
1.186
1.184
1.182
1.180
1.178
1.176
1.174
1.172
1.170
100
1440/1/2 G13
20
40
20 40
80
120
0
60
140
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