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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.
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 |
View More
Technical Docs
| Data Sheet | Ultra Low-Power, Single/Dual-Supply Comparators | Feb 21, 2020 | |
| App Note | Provide Remote Alarm for Smoke Detector | ||
| App Note | Circuit Connection Adds Current-Mode Operation to PFM Boost Converters | ||
| App Note | Simple Circuit Measures Battery Drain | ||
| App Note | Boost Converter Has High Efficiency at Light Loads |
Click any title below to view the detail page where available.
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 | SIMULATION MODELS MAX921 Macromodel | Download |
| SIMULATION MODELS MAX921HYST Test Circuit File | Download |
Support & Training
Search our knowledge base for answers to your technical questions.
Filtered SearchOur dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal
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.
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.
Technical Docs
| Data Sheet | Ultra Low-Power, Single/Dual-Supply Comparators | Feb 21, 2020 | |
| App Note | Provide Remote Alarm for Smoke Detector | ||
| App Note | Circuit Connection Adds Current-Mode Operation to PFM Boost Converters | ||
| App Note | Simple Circuit Measures Battery Drain | ||
| App Note | Boost Converter Has High Efficiency at Light Loads |
Support & Training
Search our knowledge base for answers to your technical questions.
Filtered SearchOur dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal
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