19-0115; Rev 6; 4/09
Ultra Low-Power,
Single/Dual-Supply Comparators
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.
____________________________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
TEMP RANGE
PIN-PACKAGE
INTERNAL 1%
PRECISION
REFERENCE
COMPARATORS
PER
PACKAGE
INTERNAL
HYSTERESIS
1
Yes
8-Pin
DIP/SO/µMAX
MAX922
No
2
No
8-Pin
DIP/SO/µMAX
MAX923
Yes
2
Yes
8-Pin
DIP/SO/µMAX
MAX924
Yes
4
No
16-Pin
DIP/SO/µMAX
PACKAGE
PART
Yes
0°C to +70°C
8 Plastic DIP
MAX921CSA
MAX921
MAX921CPA
0°C to +70°C
8 SO
MAX921CUA
0°C to +70°C
8 µMAX
MAX921C/D
0°C to +70°C
Dice*
MAX921EPA
-40°C to +85°C
8 Plastic DIP
MAX921ESA
-40°C to +85°C
8 SO
MAX921MJA
-55°C to +125°C
8 CERDIP
Ordering Information continued at end of data sheet.
*Dice are tested at TA = +25°C, DC parameters only.
**Contact factory for availability.
__________Typical Operating Circuit
VIN
7
V+
3 IN+
OUT 8
4 IN-
________________________Applications
Battery-Powered Systems
Threshold Detectors
Window Comparators
Oscillator Circuits
µMAX is a registered trademark of Maxim Integrated Products, Inc.
5 HYST
MAX921
6 REF
V2
GND
1
THRESHOLD DETECTOR
________________________________________________________________ Maxim Integrated Products
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim's website at www.maxim-ic.com.
1
MAX921–MAX924
_______________General Description
