19-0450; Rev 3; 2/03
Ultra-Low-Power, Open-Drain,
Single/Dual-Supply Comparators
General Description
The MAX971–MAX974 and MAX981–MAX984 single/
dual/quad low-voltage comparators feature the lowest
power consumption available. These micropower
devices draw less than 4µA supply current over
temperature (MAX971/MAX972/MAX981/MAX982), and
include an internal 1.182V ±1% (MAX971/MAX973/
MAX974) or ±2% (MAX981–MAX984) voltage reference
and programmable hysteresis.
Ideal for 3V or 5V single-supply applications, these
devices operate from a single 2.5V to 11V supply (or
±1.25V to ±5.5V dual supplies), and each comparator’s
input voltage ranges from the negative supply rail to within
1.3V of the positive supply.
The single MAX971/MAX981 and the dual MAX973/
MAX982/MAX983 provide a unique, simple method for
adding hysteresis without feedback or complicated
equations, simply by using the HYST pin plus two
resistors.
The MAX971–MAX974 and MAX981–MAX984’s open-
drain outputs permit wire-ORed configurations. Thanks to
an 11V output range and separate GND pin for the output
transistor (MAX971/MAX974, MAX981/MAX984), these
devices are ideal for level translators and bipolar to single-
ended converters. For similar devices with complementary
output stages, see the MAX921–MAX924 (1% reference)
and the MAX931–MAX934 (2% reference).
COMPARATORS
PER
PACKAGE
INTERNAL
HYSTERESIS
INTERNAL
PRECISION
REFERENCE
Features
o
Available in Ultra-Small Packages:
UCSP™ (MAX972)
µMAX (MAX9_1/MAX9_2/MAX9_3)
o
Ultra-Low Quiescent Current (4µA, max)
Over Extended Temp Range (MAX971/MAX981)
o
Power Supplies:
Single 2.5V to 11V
Dual ±1.25V to ±5.5V
o
Input Voltage Range Includes Negative Supply
o
Internal Bandgap Reference
1.182V ±1% (MAX97_)
1.182V ±2% (MAX98_)
o
12µs Propagation Delay (10mV Overdrive)
o
Output Has Separate GND Pin (MAX9_1/MAX9_4)
MAX971–MAX974/MAX981–MAX984
Applications
Battery-Powered
Systems
Threshold Detectors
Window Comparators
Level Translators
Oscillator Circuits
Ordering Information
PART
MAX971CPA
MAX971CSA
MAX971CUA
TEMP RANGE
0°C to +70°C
0°C to +70°C
0°C to +70°C
PIN-PACKAGE
8 Plastic Dip
8 SO
8 µMAX
PACKAGE
Ordering Information continued at end of data sheet.
PART
Typical Operating Circuit
V
IN
7
V+
3 IN+
OUT 8
4 IN-
MAX971
MAX972
MAX973
MAX974
MAX981
MAX982
MAX983
MAX984
1%
None
1%
1%
2%
2%
2%
2%
1
2
2
4
1
2
2
4
Yes
No
Yes
No
Yes
Yes
Yes
No
8-Pin
DIP/SO/µMAX
8-Pin UCSP/
DIP/SO/µMAX
8-Pin
DIP/SO/µMAX
16-Pin DIP/SO
8-Pin
DIP/SO/µMAX
8-Pin
DIP/SO/µMAX
8-Pin
DIP/SO/µMAX
16-Pin DIP/SO
5 HYST
6 REF
V-
2
MAX971
MAX981
GND
1
THRESHOLD DETECTOR
UCSP is a trademark of Maxim Integrated Products, Inc.
________________________________________________________________________________________ 1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
MAXIM [ MAXIM INTEGRATED PRODUCTS ]
