1
LTC1440/LTC1441/LTC1442
144012fd
APPLICATIO S
U
Ultralow Power Single/Dual
Comparator with Reference
V
+
R1
1.65M
1%
R2
1.13M
1%
3.3V
V
–
21
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 (µA)
V
+
= 5V
V
–
= GND = 0V
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 3.7µA 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.
■
Battery-Powered System Monitoring
■
Threshold Detectors
■
Window Comparators
■
Oscillator Circuits
■
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)
FEATURES
DESCRIPTIO
U
TYPICAL APPLICATIO
U
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
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