MAX931CSA Integrated Circuit Chip Ultra Low-Power, Low-Cost Comparators with 2eference

Ultra Low-Power, Low-Cost Comparators with 2% Reference

General Description

The MAX931-MAX934 single, dual, and quad micropower, low-voltage comparators plus an on-board 2% accurate reference feature the lowest power consumption available. These comparators draw less than 4µA supply current over temperature (MAX931), and include an internal 1.182V ±2% voltage reference, programmable hysteresis, and TTL/CMOS outputs that sink and source current.

Ideal for 3V or 5V single-supply applications, the MAX931-MAX934 operate from a single +2.5V to +11V supply (or a ±1.25V to ±5V dual supply), and each comparator’s input voltage range extends from the negative supply rail to within 1.3V of the positive supply.

The MAX931-MAX934’s unique output stage continuously sources as much as 40mA. And by eliminating powersupply glitches that commonly occur when comparators change logic states, the MAX931-MAX934 minimize parasitic feedback, which makes them easier to use.

The single MAX931 and dual MAX932/MAX933 provide a unique and simple method for adding hysteresis without feedback and complicated equations, using the HYST pin and two resistors.

For applications that require increased precision with similar power requirements, see the MAX921-MAX924 data sheet. These devices include a 1% precision reference.

Applications

Battery-Powered Systems

Threshold Detectors

Window Comparators

Oscillator Circuits

Alarm Circuits

Features

♦ Ultra-Low 4µA Max Quiescent Current Over Extended Temp. Range (MAX931)

♦ Power Supplies: Single +2.5V to +11V Dual ±1.25V to ±5.5V

♦ Input Voltage Range Includes Negative Supply

♦ Internal 1.182V ±2% Bandgap Reference

♦ Adjustable Hysteresis

♦ TTL-/CMOS-Compatible Outputs

♦ 12µs Propagation Delay (10mV Overdrive)

♦ No Switching Crowbar Current

♦ 40mA Continuous Source Current

♦ Available in Space-Saving µMAX Package

Typical Operating Circuit

ABSOLUTE MAXIMUM RATINGS

V+ to V-, V+ to GND, GND to V-................................-0.3V, +12V

Inputs

  Current, IN_+, IN_-, HYST...............................................20mA

  Voltage, IN_+, IN_-, HYST................(V+ + 0.3V) to (V- – 0.3V)

Outputs

  Current, REF....................................................................20mA

  Current, OUT_.................................................................50mA

  Voltage, REF ....................................(V+ + 0.3V) to (V- – 0.3V)

  Voltage, OUT_ (MAX931/934) .....(V+ + 0.3V) to (GND – 0.3V)

  Voltage, OUT_ (MAX932/933)..........(V+ + 0.3V) to (V- – 0.3V)

  OUT_ Short-Circuit Duration (V+ ≤ 5.5V) ...............Continuous

Continuous Power Dissipation (TA = +70°C)

  8-Pin Plastic DIP (derate 9.09mW/°C above +70°C) ...727mW

  8-Pin SO (derate 5.88mW/°C above +70°C)................471mW

  8-Pin µMAX (derate 4.1mW/°C above +70°C) .............330mW

  16-Pin Plastic DIP (derate 10.53mW/°C above +70°C)..842mW

  16-Pin SO (derate 8.70mW/°C above +70°C) ................696mW

Operating Temperature Ranges:

  MAX93_C_ _ .......................................................0°C to +70°C

  MAX93_E_ _.....................................................-40°C to +85°C

Storage Temperature Range .............................-65°C to +150°C

Lead Temperature (soldering, 10sec) .............................+300°C

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