LTC1440 Datasheet, PDF (1/12 Pages) Linear Technology – Ultralow Power Single/Dual Comparator with Reference

LTC1440/LTC1441/LTC1442
Ultralow Power Single/Dual
Comparator with Reference
FEATURES
s _{Ultralow Quiescent Current: 2.1µA 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 0.01µF Capacitor}
s _{Adjustable Hysteresis (LTC1440/LTC1442)}
s _{TTL/CMOS Compatible Outputs}
s _{12µs Propagation Delay with 10mV Overdrive}
s _{No Crowbar Current}
s _{40mA Continuous Source Current}
s _{Pin Compatible Upgrades for MAX921/922/923}
U
APPLICATIONS
s _{Battery-Powered System Monitoring}
s _{Threshold Detectors}
s _{Window Comparators}
s _{Oscillator Circuits}
, LTC and LT are registered trademarks of Linear Technology Corporation.
DESCRIPTION
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 and MSOP
packages. The LTC1441/LTC1442 are available in 8-pin
PDIP and SO packages.
TYPICAL APPLICATION
Micropower 2.9V V_CC Threshold Detector
3.3V
R1
1.65M
1%
3 IN⁺
R2
1.13M
1%
4 IN^–
7
V⁺
+
–
5 HYST
8
OUT
6 REF
LTC1440
V^–
GND
2
1
1440 TA01
LTC1440 Supply Current vs Temperature
5.0
V⁺ = 5V
4.5 V^– = GND = 0V
4.0
3.5
3.0
2.5
2.0
1.5
–40 –20
0 20 40 60
TEMPERATURE (°C)
80 100
1440/1/2 TA02
1