Datasheet LTC1440, LTC1441, LTC1442 (Analog Devices)

LTC1440/LTC1441/LTC1442 Ultralow Power Single/Dual Comparator with Reference
U FEATURES DESCRIPTIO
■
Ultralow Quiescent Current: 2.1
µ
A Typ (LTC1440)
The LTC®1440/LTC1441/LTC1442 are ultralow power ■
Reference Output Drives 0.01
µ
F Capacitor
single and dual comparators with built-in references. The ■
Adjustable Hysteresis (LTC1440/LTC1442)
comparators feature less than 3.7µA supply current over ■ Wide Supply Range: temperature (LTC1440), a 1.182V ±1% reference, pro- Single: 2V to 11V grammable hysteresis (LTC1440/LTC1442) and TTL/CMOS Dual: ±1V to ±5.5V outputs that sink and source current. The reference output ■ Input Voltage Range Includes the Negative Supply can drive a bypass capacitor of up to 0.01µF without ■ TTL/CMOS Compatible Outputs oscillation. ■ 12µs Propagation Delay with 10mV Overdrive The comparators operate from a single 2V to 11V supply ■ No Crowbar Current or a dual ±1V to ±5.5V supply (LTC1440). Comparator ■ 40mA Continuous Source Current hysteresis is easily programmed by using two resistors ■ Pin Compatible Upgrades for MAX921/922/923 and the HYST pin (LTC1440/LTC1442). Each comparator’s ■ 3mm x 3mm x 0.75mm DFN Package (LTC1440) input operates from the negative supply to within 1.3V of
U
the positive supply. The comparator output stage can
APPLICATIO S
continuously source up to 40mA. By eliminating the cross-conducting current that normally happens when the ■ Battery-Powered System Monitoring comparator changes logic states, the power supply glitches ■ Threshold Detectors are eliminated. ■ Window Comparators ■ Oscillator Circuits The LTC1440 is available in 8-pin PDIP, SO, MSOP and DFN packages. The LTC1441/LTC1442 are available in , LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. 8-pin PDIP and SO packages.
U TYPICAL APPLICATIO Micropower 2.9V VCC Threshold Detector LTC1440 Supply Current vs Temperature
3.3V 5.0 V+ = 5V R1 7 4.5 V– = GND = 0V 1.65M V + 1% 3 IN+ 4.0 µA) + R2 8 OUT 3.5 1.13M 4 IN– 1% – 3.0 5 HYST 2.5 SUPPLY CURRENT ( 2.0 LTC1440 6 REF 1.5 –40 –20 0 20 40 60 80 100 V – GND TEMPERATURE (°C) 2 1 1440/1/2 TA02 1440 TA01 144012fd 1