19-0115; Rev 3; 3/95
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 con-
tinuously sources as much as 40mA. And by eliminating
power-supply glitches that commonly occur when com-
parators 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.
COMPARATORS
PER
PACKAGE
____________________________Features
o
µMAX Package—Smallest 8-Pin SO
(MAX921/MAX922/MAX923)
o
Ultra-Low 4µA Max Quiescent Current
Over Extended Temp. Range (MAX921)
o
Power Supplies:
Single +2.5V to +11V
Dual ±1.25V to ±5.5V
o
Input Voltage Range Includes Negative Supply
o
Internal 1.182V ±1% Bandgap Reference
o
Adjustable Hysteresis
o
TTL/CMOS-Compatible Outputs
o
12µs Propagation Delay (10mV Overdrive)
o
No Switching Crowbar Current
o
40mA Continuous Source Current
MAX921–MAX924
______________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**
INTERNAL 1%
PRECISION
REFERENCE
INTERNAL
HYSTERESIS
PACKAGE
PART
MAX921
MAX922
MAX923
MAX924
Yes
No
Yes
Yes
1
2
2
4
Yes
No
Yes
No
8-Pin
DIP/SO/µMAX
8-Pin
DIP/SO/µMAX
8-Pin
DIP/SO/µMAX
16-Pin
DIP/SO/µMAX
Ordering Information continued at end of data sheet.
* Dice are tested at T
A
= +25°C, DC parameters only.
** Contact factory for availability and processing to MIL-STD-883.
__________Typical Operating Circuit
V
IN
7
V+
3 IN+
OUT 8
4 IN-
________________________Applications
Battery-Powered Systems
Threshold Detectors
Window Comparators
Oscillator Circuits
5 HYST
6 REF
V-
2
MAX921
GND
1
THRESHOLD DETECTOR
________________________________________________________________
Maxim Integrated Products
1
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