Document
Click here for production status of specific part numbers.
MAX921–MAX924
Ultra Low-Power, Single/Dual-Supply Comparators
General Description
The MAX921–MAX924 single, dual, and quad micro-power, 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 powersupply 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.
PART INTERNAL 1% PRECISION REFERENCE COMPARATORS PER PACKAGE INTERNAL HYSTERESIS PACKAGE
MAX921 MAX922 MAX923 MAX924
Yes No Yes Yes
1
Yes
8-Pin DIP/SO/μMAX
2
No
8-Pin DIP/SO/μMAX
2
Yes
8-Pin DIP/SO/μMAX
4
No
16-Pin DIP/SO/μMAX
Applications
●● Battery-Powered Systems ●● Threshold Detectors ●● Window Comparators ●● Oscillator Circuits
μMAX is a registered trademark of Maxim Integrated Products, Inc.
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
Ordering Information
PART MAX921CPA MAX921CSA MAX921CUA MAX921C/D MAX921EPA MAX921ESA MAX921MJA
TEMP RANGE 0°C to +70°C 0°C to +70°C 0°C to +70°C 0°C to +70°C -40°C to +85°C -40°C to +85°C -55°C to +125°C
PIN-PACKAGE 8 Plastic DIP 8 SO 8 μMAX Dice* 8 Plastic DIP 8 SO 8 CERDIP
Ordering Information continued at end of data sheet.
*Dice are **Contact
tfeasctteodryaftoTr Aav=ai+la2b5il°iCty,.
DC
parameters
only.
Typical Operating Circuit
VIN 7 V+
3 IN+
4 IN-
OUT 8
5 HYST
6 REF
V2
MAX921
GND 1
THRESHOLD DETECTOR
19-0115; Rev 7; 1/20
MAX921–MAX924
Ultra Low-Power, Single/Dual-Supply Comparators
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+ ≤ 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 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, 10s).................................. +300°C
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
Electrical Characteristics : 5V OPERATION
(V+ = 5V, V- = GND = 0V, TA = TMIN to TMAX, unless otherwise noted.)
PARAMETER POWER REQUIREMENTS Supply Voltage Range
Supply Current
COMPARATOR Input Offset Voltage Input Leakage Current .