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MAX971CSA-MAX971CUA-MAX971ESA
Ultra-Low-Power, Open-Drain, Single/Dual-Supply Comparators
_______________General DescriptionThe 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 and MAX981 and the dual MAX973
and 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).
____________________________FeaturesµMAX Package—Smallest 8-Pin SO
(MAX9_1/MAX9_2/MAX9_3)Ultra-Low 4µA Max Quiescent Current
Over Extended Temp. Range (MAX971/MAX981)Power Supplies: Single +2.5V to +11V
Dual ±1.25V to ±5.5VInput Voltage Range Includes Negative SupplyInternal 1.182V ±1% Bandgap Reference 12µs Propagation Delay (10mV Overdrive)Output Has Separate GND Pin (MAX9_1/MAX9_4)
________________________ApplicationsBattery-Powered SystemsLevel Translators
Threshold DetectorsOscillator Circuits
Window Comparators
MAX971–MAX974/MAX981–MAX984
Ultra-Low-Power, Open-Drain,
Single/Dual-Supply Comparators
________________________________________________________________Maxim Integrated Products1
Call toll free 1-800-998-8800 for free samples or literature.19-0450; Rev 0; 11/95
MAX971–MAX974/MAX981–MAX984
Ultra-Low-Power, Open-Drain,
Single/Dual-Supply ComparatorsV+ 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
OUT_................................................................50mA
Voltage: REF....................................(V+ + 0.3V) to (V- - 0.3V)
OUT_ (MAX9_1/9_4)...............+12V to (GND - 0.3V)
(MAX9_2/9_3)....................+12V to (V- - 0.3V)
OUT_ Short-Circuit Duration ..................................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
MAX97_C_ _/MAX98_C_ _..................................0°C to +70°C
MAX97_E_ _/MAX98_E_ _...............................-40°C to +85°C
MAX97_MJ_/MAX98_MJ_ .............................-55°C to +125°C
Storage Temperature Range.............................-65°C to +150°C
Lead Temperature (soldering, 10sec).............................+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.
ABSOLUTE MAXIMUM RATINGS
MAX971–MAX974/MAX981–MAX984
Ultra-Low-Power, Open-Drain,
Single/Dual-Supply Comparators
_______________________________________________________________________________________3
ELECTRICAL CHARACTERISTICS: 5V OPERATION (continued)(V+ = 5V, V- = GND = 0V, TA= TMINto TMAX, unless otherwise noted. Typical values are at TA= +25°C.)
ELECTRICAL CHARACTERISTICS: 3V OPERATION(V+ = 5V, V- = GND = 0V, TA= TMINto TMAX, unless otherwise noted. Typical values are at TA= +25°C.)
MAX971–MAX974/MAX981–MAX984
Ultra-Low-Power, Open-Drain,
Single/Dual-Supply Comparators_______________________________________________________________________________________
__________________________________________Typical Operating Characteristics(V+ = 5V, V- = GND, TA = +25°C, unless otherwise noted.)
OUTPUT VOLTAGE LOW
vs. LOAD CURRENT
MAX971/4-TOC1
LOAD CURRENT (mA)
(V)
REFERENCE OUTPUT VOLTAGE vs.
OUTPUT LOAD CURRENT
MAX971/4-TOC2
OUTPUT LOAD CURRENT (μA)
REFERENCE OUTPUT VOLTAGE (V)20
MAX971/MAX973/MAX974
REFERENCE VOLTAGE vs. TEMPERATURE
MAX971/4-TOC3
TEMPERATURE (°C)
REFERENCE VOLTAGE (V)100
ELECTRICAL CHARACTERISTICS: 3V OPERATION (continued)
(V+ = 5V, V- = GND = 0V, TA= TMINto TMAX, unless otherwise noted. Typical values are at TA= +25°C.)
Note 1:MAX974/MAX984 comparators work below 2.5V; see Low-Voltage Operation section for more details.
Note 2:Low-to-high response time is the result of the 1MΩpull-up and the 100pF capacitive load, based on three time constants.
A faster response time is achieved with a smaller RC.
MAX971–MAX974/MAX981–MAX984
Ultra-Low-Power, Open-Drain,
Single/Dual-Supply Comparators5MAX9_1
SUPPLY CURRENT vs.
TEMPERATURE
MAX971/4-TOC4
TEMPERATURE (°C)
SUPPLY CURRENT (
MAX972
SUPPLY CURRENT vs. TEMPERATURE
MAX971/4-TOC5
TEMPERATURE (°C)
SUPPLY CURRENT (
MAX982/MAX9_3
SUPPLY CURRENT vs. TEMPERATURE
MAX971/4-TOC6
TEMPERATURE (°C)
SUPPLY CURRENT (
MAX9_4
SUPPLY CURRENT vs. TEMPERATURE
MAX971/4-TOC7
TEMPERATURE (°C)
SUPPLY CURRENT (
MAX9_4
SUPPLY CURRENT vs.
LOW SUPPLY VOLTAGES
MAX971/4-TOC8
SINGLE-SUPPLY VOLTAGE (V)
SUPPLY CURRENT (
MAX9_1/MAX982/MAX9_3
HYSTERESIS CONTROL
MAX971/4 TOC9
VREF -VHYST (mV)
IN+ - IN- (V)40
RESPONSE TIME vs.
LOAD CAPACITANCE
MAX971/4 TOC11
LOAD CAPACITANCE (nF)
RESPONSE TIME (8021018
RESPONSE TIME FOR VARIOUS
INPUT OVERDRIVES (VOHL)MAX971/4-TOC12
RESPONSE TIME (μs)
OUT
(V)
(mV)
____________________________Typical Operating Characteristics (continued)(V+ = 5V, V- = GND, TA = +25°C, unless otherwise noted.)
MAX971–MAX974/MAX981–MAX984
Ultra-Low-Power, Open-Drain,
Single/Dual-Supply Comparators_______________________________________________________________________________________
____________________________Typical Operating Characteristics (continued)(V+ = 5V, V- = GND, TA = +25°C, unless otherwise noted.)
RESPONSE TIME
AT LOW SUPPLY VOLTAGES (VOHL)
MAX971/4-TOC13
SINGLE-SUPPLY VOLTAGE (V)
RESPONSE TIME (
1.21.41.61.8
MAX924 RESPONSE TIME
AT LOW SUPPLY VOLTAGES
MAX971/4-TOC14
SINGLE-SUPPLY VOLTAGE (V)
CURRENT (mA)
SHORT-CIRCUIT SINK CURRENT
vs. SUPPLY VOLTAGE
MAX971/4-TOC15
TOTAL SUPPLY VOLTAGE (V)
SINK CURRENT (mA)
____________________________________________________________Pin Descriptions
MAX971–MAX974/MAX981–MAX984
Ultra-Low-Power, Open-Drain,
Single/Dual-Supply Comparators
_______________________________________________________________________________________7
_______________________________________________Pin Descriptions (continued)
MAX971–MAX974/MAX981–MAX984
Ultra-Low-Power, Open-Drain,
Single/Dual-Supply Comparators_______________________________________________________________________________________
_______________Detailed DescriptionThe MAX971–MAX974 and MAX981–MAX984 comprise
various combinations of a micropower 1.182V reference
and micropower comparators. The Typical Operating
Circuitshows the MAX971/MAX981 configuration, and
Figures 1a–1d show the MAX9_2–MAX9_4 configurations.
Internal hysteresis in the MAX9_1, MAX982, and
MAX9_3 provides the easiest method for implementing
hysteresis. It also produces faster hysteresis action and
consumes much less current than circuits using external
positive feedback.
Power-Supply and Input Signal RangesThis family of devices operates from a single +2.5V to
+11V power supply. The MAX9_1 and MAX9_4 have a
separate ground for the output driver, allowing operation
with dual supplies ranging from ±1.25V to ±5.5V.
Connect V- to GND when operating the MAX9_1 or
MAX9_4 from a single supply. The maximum total
supply voltage in this case is still 11V.
For proper comparator operation, the input signal can
range from the negative supply (V-) to within one volt of
the positive supply (V+ - 1V). The guaranteed
common-mode input voltage range extends from V- to
(V+ - 1.3V). The inputs can be taken above and below
the supply rails by up to 300mV without damage.
Figure 1a.MAX972 Functional Diagram
Figure 1c.MAX973/MAX983 Functional Diagram (Window
Comparator)
Figure 1b.MAX982 Functional Diagram
