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MAX974：Ultra-Low-Power, Open-Drain, Single/Dual-Supply Comparators

The MAX971–MAX974 and MAX981–MAX984 single/dual/quad low-voltage comparators feature the lowest power consumption available. These micropower devices draw less than 4µA supply current over temperature (MAX971/MAX972/MAX981/MAX982), and include an internal 1.182V ±1% (MAX971/MAX973/ MAX974) or ±2% (MAX981–MAX984) voltage reference and programmable hysteresis. Ideal for 3V or 5V single-supply applications, these devices operate from a single 2.5V to 11V supply (or ±1.25V to ±5.5V dual supplies), and each comparator's input voltage ranges from the negative supply rail to within 1.3V of the positive supply. The single MAX971/MAX981 and the dual MAX973/ MAX982/MAX983 provide a unique, simple method for adding hysteresis without feedback or complicated equations, simply by using the HYST pin plus two resistors. The MAX971–MAX974 and MAX981–MAX984's open-drain outputs permit wire-ORed configurations. Thanks to an 11V output range and separate GND pin for the output transistor (MAX971/MAX974, MAX981/MAX984), these devices are ideal for level translators and bipolar to single-ended converters. For similar devices with complementary output stages, see the MAX921-MAX924 (1% reference) and the MAX931–MAX934 (2% reference).

Key Features Available in Ultra-Small Packages: UCSP™ (MAX972) µMAX® (MAX9_1/MAX9_2/MAX9_3) Ultra-Low Quiescent Current (4µA, max) Over Extended Temp Range (MAX971/MAX981) Power Supplies: Single 2.5V to 11V Dual ±1.25V to ±5.5V Input Voltage Range Includes Negative Supply Internal Bandgap Reference 1.182V ±1% (MAX97_) 1.182V ±2% (MAX98_) 12µs Propagation Delay (10mV Overdrive) Output Has Separate GND Pin (MAX9_1/MAX9_4)

MAX971, MAX972, MAX973, MAX974, MAX981, MAX982, MAX983, MAX984: Typical Operating Circuit Applications/Uses Battery-Powered Systems Level Translators Oscillator Circuits Threshold Detectors Window Comparators

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