LTC1442

Features:

Ultralow Quiescent Current: 2.1µA Typ (LTC1440)
Wide Supply Range:
        Single: 2V to 11V
        Dual: ±1V to ±5.5V
Input Voltage Range Includes the Negative Supply
Reference Output Drives 0.01µF Capacitor
Adjustable Hysteresis (LTC1440/LTC1442)
TTL/CMOS Compatible Outputs
12µs Propagation Delay with 10mV Overdrive
No Crowbar Current
40mA Continuous Source Current
Pin Compatible Upgrades for MAX921/922/923


Application

Battery-Powered System Monitoring
Threshold Detectors
Window Comparators
Oscillator Circuits


Pinout




Specifications

Voltage
V⁺ to V, V⁺ to GND, GND to V............12V to 0.3V
IN⁺, IN, HYST......................(V⁺+ 0.3V) to (V0.3V)
REF.......................................(V⁺+ 0.3V) to (V0.3V)
OUT (LTC1440)...................(V⁺+ 0.3V) to (GND0.3V)
OUT (LTC1441/LTC1442).....(V⁺ + 0.3V) to (V0.3V)
Current
IN⁺, IN, HYST..................................................20mA
REF....................................................................20mA
OUT...................................................................50mA
OUT Short-Circuit Duration (V⁺  5.5V)....Continuous
Power Dissipation..........................................500mW
Operating Temperature Range
LTC144XC.............................................0°C to 70°C
LTC144XI.........................................40°C to 85°C
Storage Temperature Range.........65°C to 150°C
Lead Temperature (Soldering, 10 sec)............300°C

Description

The LTC^®1440/LTC1441/LTC1442 are ultralow power sigle 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.