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MAX921

MAX921

Ultra Low-Power, Single/Dual-Supply Comparators

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Overview

Description

The MAX921–MAX924 single, dual, and quad micropower, low-voltage comparators feature the lowest power consumption available. These comparators draw less than 4µA supply current over temperature (MAX921/MAX922), and include an internal 1.182V ±1% voltage reference, programmable hysteresis, and TTL/CMOS outputs that sink and source current.

Ideal for 3V or 5V single-supply applications, the MAX921–MAX924 operate from a single +2.5V to +11V supply (or a ±1.25V to ±5V dual supply), and each comparator's input voltage range swings from the negative supply rail to within 1.3V of the positive supply.

The MAX921–MAX924's unique output stage continuously sources as much as 40mA. And by eliminating power-supply glitches that commonly occur when comparators change logic states, the MAX921–MAX924 minimize parasitic feedback, which makes them easier to use.

The single MAX921 and dual MAX923 provide a unique and simple method for adding hysteresis without feedback and complicated equations, simply by using the HYST pin and two resistors.
MAX921, MAX922, MAX923, MAX924: Typical Operating Circuit MAX921, MAX922, MAX923, MAX924: Typical Operating Circuit Enlarge+

Key Features

  • µMAX® Package—Smallest 8-Pin SO (MAX921/MAX922/MAX923)
  • Ultra-Low 4µA Max Quiescent Current Over Extended Temp. Range (MAX921)
  • Power Supplies:
    • Single +2.5V to +11V
    • Dual ±1.25V to ±5.5V
  • Input Voltage Range Includes Negative Supply
  • Internal 1.182V ±1% Bandgap Reference
  • Adjustable Hysteresis
  • TTL/CMOS-Compatible Outputs
  • 12µs Propagation Delay (10mV Overdrive)
  • No Switching Crowbar Current
  • 40mA Continuous Source Current

Applications/Uses

  • Battery-Powered Applications
  • Oscillator Circuits
  • Threshold Detectors
  • Window Comparators

Parametric Specs

See parametric specs for Comparators (97)


Part NumberComparatorstPD
(ns)		Input RangeVSUPPLY (Total)
(V)		VSUPPLY (Total)
(V)		ICC per Comp.
(µA)		VOS
(mV)		Logic OutOper. Temp.
(°C)		Package/PinsBudgetary
Price
(typ)(min)(max)(max)(max)(See Notes)
MAX922 212000to Neg. Rail2.5111.610Push-Pull
-55 to +125
-40 to +85
0 to +70
CDIP/8
PDIP/8
SOIC (N)/8
UMAX/8
$2.28 @1k

Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

See parametric specs for Comparators + Reference (48)


Part NumberComparatorsThresh.
(V)		Internal Reference Accuracy
(%)		tPD
(µs)		VSUPPLY
(V)		VSUPPLY
(V)		ICC
(µA)		Prog. Hyst.VOS
(mV)		Logic OutOper. Temp.
(°C)		Package/PinsBudgetary
Price
(typ)(min)(max)(max)(max)(See Notes)
MAX921 11.1821122.5113.2Yes10TTL/CMOS
-55 to +125
-40 to +85
0 to +70
CDIP/8
DICE SALES
PDIP/8
SOIC (N)/8
UMAX/8
$3.11 @1k
MAX923 24.5Yes
CDIP/8
DICE SALES/N
PDIP/8
SOIC (N)/8
UMAX/8
$3.39 @1k
MAX924 46.6No
CDIP/16
DICE SALES/N
PDIP/16
SOIC (N)/16
$3.20 @1k

Design Resources

Technical Documents

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App Note 527 Simple Circuit Measures Battery Drain
App Note 110 Boost Converter Has High Efficiency at Light Loads

Tools & Models

  • MAX921 Macromodel
  • MAX921HYST Test Circuit File
  • MAX921 Macromodel
  • MAX921HYST Test Circuit File
  • MAX921RES Test Circuit File

    •

    Quality And Environmental

    Product Reliability Reports: MAX921.pdf 
    Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C   Material Composition  

    Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

    Quality Management System >
    Environmental Management System >

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