The MAX9021/MAX9022/MAX9024 single/dual/quad comparators are optimized for low-power consumption while still providing a fast output response. They are designed for single-supply applications from 2.5V to 5.5V, but can also operate from dual supplies. These comparators have a 3µs propagation delay and consume 2.8µA of supply current per comparator over the -40°C to +125°C operating temperature range. The combination of low-power, single-supply operation down to 2.5V, and ultra-small footprint makes these devices ideal for portable applications. The MAX9021/MAX9022/MAX9024 have 4mV of built-in hysteresis to provide noise immunity and prevent oscillations even with a slow-moving input signal. The input common-mode range extends from the negative supply to within 1.1V of the positive supply. The design of the comparator-output stage substantially reduces switching current during output transitions, eliminating powersupply glitches. The MAX9021 single comparator is available in tiny 5-pin SC70 and SOT23 packages. The MAX9022 dual comparator is available in 8-pin SOT23, µMAX®, and SO packages, and the MAX9024 quad comparator is available in 14-pin TSSOP and SO packages. Applications * Battery-Powered * Digital Line Receivers * Keyless Entry Systems * Mobile Communications * Photodiode Preamps * Portable Systems * Sensor-Signal Detection * Threshold Detectors/Discriminators * Low-Cost Solution Available in Space-Saving SC70 Packages (Half the Size of SOT23) * Low 2.8µA Supply Current * 3µs Propagation Delay * Internal 4mV Comparator Hysteresis * Comparator Output Swings Rail-to-Rail * 2.5 to 5.5V Single-Supply Voltage Range * No Phase Reversal for Overdriven Inputs * Space-Saving Packages * 5-Pin SC70 (MAX9021) * 8-Pin SOT23 (MAX9022) * 8-Pin µMAX (MAX9022) * 14-Pin TSSOP (MAX9024)