LTC1540 Nanopower Comparator with Reference FEATURESDESCRIPTION n Ultralow Quiescent Current: 0.3µA Typ The LTC®1540 is an ultralow power, single compara- n Reference Output Drives 0.01µF Capacitor tor with built-in reference. The comparator’s features n Adjustable Hysteresis include less than 0.6µA supply current over the commercial n Available in 3mm × 3mm × 0.8mm DFN Package temperature range, a 1.182V ±2% reference, program- n Wide Supply Range: 2V to 11V mable hysteresis and TTL/CMOS outputs that sink and n Input Voltage Range Includes the Negative Supply source current. The reference output can drive a bypass n Reference Output Sources Up to 1mA capacitor of up to 0.01µF without oscillation. n TTL/CMOS Compatible Outputs The comparator operates from a single 2V to 11V supply n 60µs Propagation Delay with 10mV Overdrive or a dual ±1V to ±5.5V supply. Comparator hysteresis is n No Crowbar Current easily programmed by using two resistors and the HYST n 40mA Continuous Source Current pin. Each comparator’s input operates from the negative n Pin Compatible with LTC1440, MAX921, MAX931 supply to within 1.3V of the positive supply. The compara- tor output stage can continuously source up to 40mA. By APPLICATIONS eliminating the cross-conducting current that normally occur when the comparator changes logic states, power n Battery-Powered System Monitoring supply glitches are eliminated. n Threshold Detectors n Window Comparators The LTC1540 is available in the 8-pin MSOP and SO n Oscillator Circuits packages. For space limited applications, the LTC1540 L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and C-Load is available in a 3mm × 3mm low profile (0.8mm) dual is a trademark of Analog Devices, Inc. All other trademarks are the property of their respective owners. fine-pitch leadless package (DFN). TYPICAL APPLICATIONNanopower 2.9V VCC Threshold Detector 3.3V LTC1540 Supply Current vs Temperature 0.50 R1 7 V+ = 5V 4.32M V+ LTC1540 0.45 V– = GND = 0V 1% 3 IN+ + 0.40 R2 8 OUT 3M 4 IN– 0.35 1% – 0.30 5 HYST 0.25 SUPPLY CURRENT (µA) 6 REF 0.20 0.15 V– GND –40 –20 0 20 40 60 80 100 2 1 TEMPERATURE (°C) 1540 • TA02 1540 • TA01 1540fb For more information www.linear.com/LTC1540 1
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