Ultralow Power Quad Comparators with Reference

The LTC1443/LTC1444/LTC1445 are ultralow power quad comparators with a built-in reference. The comparators feature less than 8.5μA supply current over temperature, an internal reference (1.182V ±1% for LTC1443 or 1.221V ±1% for LTC1444/LTC1445), programmable hysteresis (LTC1444/LTC1445) and TTL/CMOS output (LTC1443/ LTC1445) that sinks and sources current (open-drain output for LTC1444). 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 (LTC1443). Comparator hysteresis is easily programmable using two resistors and the HYST pin (LTC1444/LTC1445). Each comparator’s input operates from the negative supply to within 1.3V of the positive supply. The LTC1443/LTC1445 comparator output stage can continuously source up to 40mA. By eliminating the cross-conducting current that normally happens when the comparator changes logic states, power supply glitches are eliminated.

The LTC1443/LTC1444/LTC1445 are available in the 16-pin SO, PDIP and DFN packages.

Applications

* Battery-Powered System Monitoring

* Threshold Detectors

* Window Comparators

* Oscillator Circuits

* Ultralow Quiescent Current: 8.5μA Max* Reference Output Drives 0.01μF Capacitor* Adjustable Hysteresis (LTC1444/LTC1445)* Wide Supply Range Single: 2V to 11V Dual: ±1V to ±5.5V* Input Voltage Range Includes the Negative Supply* TTL/CMOS Compatible Outputs* Propagation Delay: 12μs (Typ) (10mV Overdrive)* No Crowbar Current* 40mA Continuous Source Current* Pin Compatible Upgrades for MAX924 (LTC1443)* Low Profile (5mm × 4mm × 0.8mm) DFN Package