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Ultra Low-Power, Single/Dual-Supply Comparators

Product Details

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.

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 for Comparators
tPD (ns) (typ) 12000
VOS (mV) (max) 10
VSUPPLY (Total) (V) (min) 2.5
VSUPPLY (Total) (V) (max) 11
# Comparators 2
Input Range to Neg. Rail
ICC per Comp. (µA) (max) 1.6
Logic Out Push-Pull
Oper. Temp. (°C) -55 to +125
-40 to +85
0 to +70
Package/Pins CDIP/8
PDIP/8
SOIC (N)/8
UMAX/8
Budgetary
Price (See Notes)
$2.28 @1k
Parametric specs for Comparators + Reference
tPD (µs) (typ) 12
VOS (mV) (max) 10
VSUPPLY (V) (min) 2.5
VSUPPLY (V) (max) 11
# Comparators 1
Thresh. (V) 1.182
Oper. Temp. (°C) -55 to +125
-40 to +85
0 to +70
Package/Pins PDIP/8
SOIC (N)/8
UMAX/8
Budgetary
Price (See Notes)
$3.11 @1k
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Simplified Block Diagram

MAX921, MAX922, MAX923, MAX924: Typical Operating Circuit MAX921, MAX922, MAX923, MAX924: Typical Operating Circuit Zoom icon

Technical Docs

Design & Development

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SIMULATION MODELS

MAX921 Macromodel

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SIMULATION MODELS

MAX921HYST Test Circuit File

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Support & Training

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Parameters

Parametric specs for Comparators
tPD (ns) (typ) 12000
VOS (mV) (max) 10
VSUPPLY (Total) (V) (min) 2.5
VSUPPLY (Total) (V) (max) 11
# Comparators 2
Input Range to Neg. Rail
ICC per Comp. (µA) (max) 1.6
Logic Out Push-Pull
Oper. Temp. (°C) -55 to +125
-40 to +85
0 to +70
Package/Pins CDIP/8
PDIP/8
SOIC (N)/8
UMAX/8
Budgetary
Price (See Notes)
$2.28 @1k
Parametric specs for Comparators + Reference
tPD (µs) (typ) 12
VOS (mV) (max) 10
VSUPPLY (V) (min) 2.5
VSUPPLY (V) (max) 11
# Comparators 1
Thresh. (V) 1.182
Oper. Temp. (°C) -55 to +125
-40 to +85
0 to +70
Package/Pins PDIP/8
SOIC (N)/8
UMAX/8
Budgetary
Price (See Notes)
$3.11 @1k

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

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.

Simplified Block Diagram

MAX921, MAX922, MAX923, MAX924: Typical Operating Circuit MAX921, MAX922, MAX923, MAX924: Typical Operating Circuit Zoom icon

Technical Docs

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal