A quad comparator and divider network form a 4-level comparator that drives 4 LEDs. RI and R2 can be used to scale the basic sensitivity of 250 mV/LED to higher voltages than the basic 1 volt (for all 4 LEDs lit).
The MAX921MAX924 single, dual, and quad micropower,low-voltage comparators feature the lowest power consumption available. These comparators draw less than 4A 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 MAX921MAX924 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.
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Battery-Powered SystemsThreshold DetectorsWindow ComparatorsOscillator Circuits
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MAX Package-Smallest 8-Pin SO (MAX921/MAX922/MAX923) Ultra-Low 4A 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 12s Propagation Delay (10mV Overdrive) No Switching Crowbar Current 40mA Continuous Source Current
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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_ (MAX921/924) ........(V+ + 0.3V) to (GND 0.3V)
Voltage OUT_ (MAX922/923).............(V+ + 0.3V) to (V- 0.3V)
OUT_ Short-Circuit Duration (V+ ² 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 MAX (derate 4.1mW/°C above +70°C) ..............330mW
8-Pin CERDIP (derate 8.00mW/°C above +70°C)..........640mW
16-Pin Plastic DIP (derate 10.53mW/°C above +70°C)..842mW
16-Pin SO (derate 8.70mW/°C above +70°C) ...............696mW
16-Pin CERDIP (derate 10.00mW/°C above +70°C........800mW
Operating Temperature Ranges:
MAX92_C_ _ ..........................................................0°C to +70°C
MAX92_E_ _........................................................-40°C to +85°C
MAX92_MJ_ .......................................................-55°C to +125°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10sec) ................................+300°C
Post a Buying Lead
Required Field 
