LTC1440/LTC1441/LTC1442
Ultralow Power Single/Dual
Comparator with Reference
FEATURES
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DESCRIPTIO
■
■
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Ultralow Quiescent Current: 2.1
µ
A Typ (LTC1440)
Reference Output Drives 0.01
µ
F Capacitor
Adjustable Hysteresis (LTC1440/LTC1442)
Wide Supply Range:
Single: 2V to 11V
Dual:
±1V
to
±5.5V
Input Voltage Range Includes the Negative Supply
TTL/CMOS Compatible Outputs
12µs Propagation Delay with 10mV Overdrive
No Crowbar Current
40mA Continuous Source Current
Pin Compatible Upgrades for MAX921/922/923
3mm x 3mm x 0.75mm DFN Package (LTC1440)
The LTC
®
1440/LTC1441/LTC1442 are ultralow power
single and dual comparators with built-in references. The
comparators feature less than 3.7µA 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 0.01µF 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, MSOP and
DFN packages. The LTC1441/LTC1442 are available in
8-pin PDIP and SO packages.
APPLICATIO S
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Battery-Powered System Monitoring
Threshold Detectors
Window Comparators
Oscillator Circuits
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
TYPICAL APPLICATIO
3.3V
Micropower 2.9V V
CC
Threshold Detector
LTC1440 Supply Current vs Temperature
5.0
V
+
= 5V
V
–
= GND = 0V
SUPPLY CURRENT (µA)
R1
1.65M
1%
R2
1.13M
1%
7
V
+
3 IN
+
4.5
4.0
3.5
3.0
2.5
2.0
+
8
OUT
4 IN
–
–
5 HYST
LTC1440
6 REF
1.5
–40 –20
V
2
–
GND
1
1440 TA01
U
40
20
60
0
TEMPERATURE (°C)
80
100
1440/1/2 TA02
U
U
144012fd
1
LTC1440/LTC1441/LTC1442
ABSOLUTE
MAXIMUM
RATINGS
(Note 1)
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
PACKAGE/ORDER INFORMATION
TOP VIEW
GND
V
–
1
2
3
4
8
7
6
5
OUT
V
+
GND 1
V
–
2
IN
+
3
IN
–
4
N8 PACKAGE
8-LEAD PDIP
IN
+
IN
–
REF
HYST
DD PACKAGE
8-LEAD (3mm
×
3mm) PLASTIC DFN
T
JMAX
= 125°C,
θ
JA
= 160°C/ W (DD)
UNDERSIDE METAL CONNECTED TO V
–
(PCB CONNECTION OPTIONAL)
T
JMAX
= 150°C,
θ
JA
= 130°C/ W (N8)
T
JMAX
= 150°C,
θ
JA
= 175°C/ W (S8)
ORDER PART
NUMBER
LTC1440CDD
LTC1440IDD
DD8 PART
MARKING*
LBTH
TOP VIEW
OUT A
1
V
–
8
7
6
5
OUT B
V
+
2
IN A
+
3
IN A
–
4
N8 PACKAGE
8-LEAD PDIP
IN B
+
IN B
–
S8 PACKAGE
8-LEAD PLASTIC SO
T
JMAX
= 150°C,
θ
JA
= 130°C/ W (N8)
T
JMAX
= 150°C,
θ
JA
= 175°C/ W (S8)
ORDER PART
NUMBER
LTC1440CN8
LTC1440CS8
LTC1440IN8
LTC1440IS8
ORDER PART
NUMBER
LTC1441CN8
LTC1441CS8
LTC1441IN8
LTC1441IS8
S8 PART
MARKING
1441
1441I
Order Options
Tape and Reel: Add #TR
Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBF Lead Free Part Marking:
http://www.linear.com/leadfree/
Consult LTC Marketing for parts specified with wider operating temperature ranges.
* The temperature grade is identified by a label on the shipping container.
2
U
U
W
W W
U
W
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
Storage Temperature Range
(DD Package) ................................... – 65°C to 125°C
Junction Temperature ........................................... 150°C
Junction Temperature (DD Package) .................... 125°C
Lead Temperature (Soldering, 10 sec).................. 300°C
TOP VIEW
8
7
6
5
OUT
V
+
REF
HYST
TOP VIEW
GND
V
–
IN
+
IN
–
1
2
3
4
8
7
6
5
OUT
V
+
REF
HYST
S8 PACKAGE
8-LEAD PLASTIC SO
MS8 PACKAGE
8-LEAD
PLASTIC MSOP
T
JMAX
= 150°C,
θ
JA
= 250°C/ W
S8 PART
MARKING
1440
1440
1440I
1440I
ORDER PART
NUMBER
LTC1440CMS8
LTC1440IMS8
MS8 PART
MARKING*
LTBX
TOP VIEW
OUT A
1
V
–
8
7
6
5
OUT B
V
+
REF
HYST
2
IN A
+
3
IN B
–
4
N8 PACKAGE
8-LEAD PDIP
S8 PACKAGE
8-LEAD PLASTIC SO
T
JMAX
= 150°C,
θ
JA
= 130°C/ W (N8)
T
JMAX
= 150°C,
θ
JA
= 175°C/ W (S8)
ORDER PART
NUMBER
LTC1442CN8
LTC1442CS8
LTC1442IN8
LTC1442IS8
S8 PART
MARKING
1442
1442I
144012fd
LTC1440/LTC1441/LTC1442
The
●
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25
°
C. V
+
= 5V and V
–
= GND = 0V unless otherwise noted.
SYMBOL PARAMETER
Power Supply
V
+
Supply Voltage Range
Supply Current
I
CC
CONDITIONS
●
LTC1440 0°C
≤
T
A
≤
70°C
●
HYST = REF (LTC1440/LTC1442)
–40°C
≤
T
A
≤
85°C
●
●
LTC1441
LTC1442
●
ELECTRICAL CHARACTERISTICS
MIN
2.0
TYP
MAX
11.0
4.0
4.4
5.7
5.7
±10
±1.0
±1.0
+
– 1.3V
V
1
1
1
UNITS
V
µA
µA
µA
µA
mV
nA
nA
V
IN
+
= IN
–
+ 80mV
2.1
3.5
3.5
±3
±0.01
±0.02
V
–
0.1
0.1
0.1
100
Comparator
V
OS
Comparator Input Offset Voltage
Input Leakage Current (IN
+
, IN
–
)
I
IN
Input Leakage Current (HYST)
Comparator Input Common
V
CM
Mode Range
CMRR
Common Mode Rejection Ratio
PSRR
Power Supply Rejection Ratio
NOISE
V
HYST
t
PD
V
OH
V
OL
Voltage Noise
Hysteresis Input Voltage Range
Propagation Delay
Output High Voltage
Output Low Voltage
V
CM
= 2.5V
V
IN +
= V
IN –
= 2.5V
●
●
●
●
V
–
to V
+
– 1.3V
V
+
= 2V to 11V (LTC1441)
V
+
= 2.5V to 11V (LTC1440/LTC1442)
100Hz to 100kHz
LTC1440/LTC1442
C
OUT
= 100pF
Overdrive = 10mV
Overdrive = 100mV
I
O
= – 13mA
I
O
= 1.8mA
LTC1440
LTC1441/LTC1442
No Load
LTC1440/LTC1442
0°C
≤
T
A
≤
70°C
–40°C
≤
T
A
≤
85°C
LTC1440 (MSOP, DFN)
●
REF – 50mV
15
8
●
●
●
V
+
– 0.4V
mV/V
mV/V
mV/V
µV
RMS
REF
V
µs
µs
V
GND + 0.4V
V
–
+ 0.4V
V
V
Reference
Reference Voltage
V
REF
I
SOURCE
I
SINK
∆V
REF
Reference Output Source Current
Reference Output Sink Current
Reference Source Current
Reference Sink Current
Voltage Noise
∆V
REF
≤
1mV (LTC1442)
∆V
REF
≤
2.5mV (LTC1442)
0
≤
I
SOURCE
≤
2mA (LTC1440)
0
≤
I
SINK
≤
10µA (LTC1440)
100Hz to 100kHz
●
●
●
●
●
●
1.170
1.164
1.164
100
10
1.194
1.200
1.200
20
0.8
0.5
100
5
1.5
5
V
V
V
µA
µA
mV
mV
mV
µV
RMS
NOISE
144012fd
3
LTC1440/LTC1441/LTC1442
The
●
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25
°
C. V
+
= 3V and V
–
= GND = 0V unless otherwise noted.
SYMBOL PARAMETER
Power Supply
Supply Voltage Range
V
+
I
CC
Supply Current
CONDITIONS
●
ELECTRICAL CHARACTERISTICS
MIN
2
TYP
MAX
11
UNITS
V
µA
µA
µA
µA
mV
nA
nA
V
mV/V
mV/V
mV/V
µV
RMS
V
µs
µs
V
V
V
IN
+
= IN
–
+ 80mV
HYST = REF (LTC1440/LTC1442)
LTC1440 0°C
≤
T
A
≤
70°C
–40°C
≤
T
A
≤
85°C
LTC1441
LTC1442
●
●
●
●
●
●
●
●
2
3.5
3.5
±3
±0.01
±0.02
V
–
0.1
0.1
0.1
100
3.9
4.3
5.7
5.7
±10
±1
±1
+
– 1.3V
V
1
1
1
REF
Comparator
V
OS
Comparator Input Offset Voltage
Input Leakage Current (IN
+
, IN
–
)
I
IN
Input Leakage Current (HYST)
Comparator Input Common
V
CM
Mode Range
CMRR
Common Mode Rejection Ratio
PSRR
Power Supply Rejection Ratio
NOISE
V
HYST
t
PD
Voltage Noise
Hysteresis Input Voltage Range
Propagation Delay
V
CM
= 1.5V
V
IN +
= V
IN –
= 1.5V
V
OH
Output High Voltage
Comparator
Output Low Voltage
V
OL
Reference
Reference Voltage
V
REF
V
–
to V
+
– 1.3V
V
+
= 2V to 11V (LTC1441)
V
+
= 2.5V to 11V (LTC1440/LTC1442)
100Hz to 100kHz
LTC1440/LTC1442
C
OUT
= 100pF
Overdrive = 10mV
Overdrive = 100mV
I
O
= – 8mA
I
O
= 0.8mA
LTC1440
LTC1441/LTC1442
LTC1440/LTC1442
0°C
≤
T
A
≤
70°C
–40°C
≤
T
A
≤
85°C
LTC1440 (MSOP, DFN)
●
REF – 50mV
14
5
●
●
●
V
+
– 0.4V
GND + 0.4V
V
–
+ 0.4V
No Load
I
SOURCE
I
SINK
∆V
REF
Reference Output Source Current
Reference Output Sink Current
Reference Source Current
Reference Sink Current
Voltage Noise
∆V
REF
≤
1mV (LTC1442)
∆V
REF
≤
2.5mV (LTC1442)
0
≤
I
SOURCE
≤
1mA (LTC1440)
0
≤
I
SINK
≤
10µA (LTC1440)
100Hz to 100kHz
●
●
●
●
●
●
1.170
1.164
1.164
60
10
1.182
1.194
1.200
1.200
120
20
0.8
0.5
100
5.5
1.5
5
V
V
V
µA
µA
mV
mV
mV
µV
RMS
NOISE
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
144012fd
4
LTC1440/LTC1441/LTC1442
TYPICAL PERFOR A CE CHARACTERISTICS
Comparator Response Time vs
Input Overdrive
OUTPUT VOLTAGE (V)
4
3
2
1
0
T
A
= 25°C
OUTPUT VOLTAGE (V)
5
100mV
50mV
10mV
20mV
INPUT VOLTAGE (mV)
0
100
–1
0
2
4
6
RESPONSE TIME (µs)
8
10
INPUT VOLTAGE (mV)
Comparator Short-Circuit Sink
Current vs Supply Voltage
200
180
160
140
120
100
80
60
40
20
0
0
1
2
3 4 5 6 7 8
SUPPLY VOLTAGE (V)
9
10
20
0
OUT CONNECTED TO V
+
T
A
= 25°C
SOURCE CURRENT (mA)
SINK CURRENT (mA)
U W
Comparator Response Time vs
Input Overdrive
5
4
3
2
1
0
T
A
= 25°C
100mV
50mV
20mV
10mV
100
0
–1
0
2
4 6 8 10 12 14 16 18
RESPONSE TIME (µs)
1440/1/2 G02
1440/1/2 G01
Comparator Short-Circuit Source
Current vs Supply Voltage
160
140
120
100
80
60
40
OUT CONNECTED TO
V
–
= GND = 0V
0
1
3
SUPPLY VOLTAGE (V)
2
4
5
1440/1/2 G04
1440/1/2 G03
144012fd
5
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