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.
Ultra-Low-Power, Open-Drain,
Single/Dual-Supply Comparators
MAX971–MAX974/MAX981–MAX984
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
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 (T
A
= +70°C)
8-Bump UCSP (derate 4.7mW/°C above +70°C) ........379mW
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
16-Pin Plastic DIP (derate 10.53mW/°C above +70°C)..842mW
16-Pin SO (derate 8.70mW/°C above +70°C) ................696mW
Operating Temperature Ranges
MAX97_C_ _/MAX98_C_ _ ..................................0°C to +70°C
MAX97_E_ _/MAX98_E_ _ ...............................-40°C to +85°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
Bump Temperature (soldering)
Reflow ..........................................................................+235°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, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C.) (Note 1)
PARAMETER
POWER REQUIREMENTS
Supply Voltage Range
Output Voltage Range
MAX9_1,
HYST = REF
IN+ = IN- +
100mV
MAX972
MAX982/
MAX9_3,
HYST = REF
MAX9_4
COMPARATOR
Input Offset Voltage
Input Leakage Current (IN-, IN+)
Input Leakage Current (HYST)
Input Common-Mode Voltage
Range
Common-Mode Rejection Ratio
Power-Supply Rejection Ratio
Voltage Noise
Hysteresis Input Voltage Range
Response Time (High-to-Low
Transition)
Response Time (Low-to-High
Transition) (Note 3)
V- to (V+ - 1.3V)
V+ = 2.5V to 11V
100Hz to 100kHz
MAX9_1/MAX982/MAX9_3
T
A
= +25°C, 100pF load,
1MΩ pullup to V+
Overdrive = 10mV
Overdrive = 100mV
REF - 0.05
12
4
300
V
CM
= 2.5V
IN+ = IN- = 2.5V
MAX9_1/MAX982/MAX9_3
V-
0.1
0.1
20
REF
C/E temp ranges
±0.01
±0.02
V+ - 1.3
1.0
1.0
±10
±5
mV
nA
nA
V
mV/V
mV/V
µV
RMS
V
µs
µs
T
A
= +25°C
C/E temp ranges
T
A
= +25°C
C/E temp ranges
T
A
= +25°C
C/E temp ranges
T
A
= +25°C
C/E temp ranges
5.5
3.1
2.5
(Note 2)
2.5
0
2.5
11
11
3.2
4
3.2
4
4.5
6
6.5
8.5
µA
V
V
CONDITIONS
MIN
TYP
MAX
UNITS
Supply Current
T
A
= +25°C, 100pF load, 1MΩ pullup to V+
2
_______________________________________________________________________________________
Ultra-Low-Power, Open-Drain,
Single/Dual-Supply Comparators
ELECTRICAL CHARACTERISTICS—5V OPERATION (continued)
(V+ = 5V, V- = GND = 0V, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C.) (Note 1)
MAX971–MAX974/MAX981–MAX984
PARAMETER
Output Low Voltage
Output Leakage Current
CONDITIONS
MAX9_2/MAX9_3, I
OUT
= 1.8mA
MAX9_1/MAX9_4, I
OUT
= 1.8mA
V
OUT
= 11V
MAX971/MAX973/
MAX974
C temp range
E temp range
C temp range
E temp range
1%
2%
2%
3%
MIN
TYP
MAX
V- + 0.4
GND
+ 0.4
100
UNITS
V
nA
REFERENCE (MAX9_1/MAX982/MAX9_3/MAX9_4 ONLY)
1.170
1.158
1.158
1.147
15
6
8
4
100
15
25
1.182
1.182
1.194
1.206
1.206
1.217
µA
µA
µV
RMS
V
Reference Voltage
MAX981–MAX984
Source Current
Sink Current
Voltage Noise
T
A
= +25°C
C/E temp ranges
T
A
= +25°C
C/E temp ranges
100Hz to 100kHz
ELECTRICAL CHARACTERISTICS—3V OPERATION
(V+ = 3V, V- = GND = 0V, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C.) (Note 1)
PARAMETER
POWER REQUIREMENTS
MAX9_1
MAX972
MAX982/
MAX9_3
MAX9_4
COMPARATOR
Input Offset Voltage
Input Leakage Current (IN-, IN+)
Input Leakage Current (HYST)
Input Common-Mode Voltage
Range
Common-Mode Rejection Ratio
Power-Supply Rejection Ratio
Voltage Noise
Hysteresis Input Voltage Range
V
CM
= 1.5V
IN+ = IN- = 1.5V
MAX9_1/MAX982/MAX9_3
V-
V- to (V+ - 1.3V)
V+ = 2.5V to 11V
100Hz to 100kHz
MAX9_1/MAX982/MAX9_3
REF - 0.05
0.2
0.1
20
REF
C/E temp ranges
±0.01
±0.02
V+ - 1.3
1
1
±10
±5
mV
nA
nA
V
mV/V
mV/V
µV
RMS
V
T
A
= +25°C
C/E temp ranges
T
A
= +25°C
C/E temp ranges
T
A
= +25°C
C/E temp ranges
T
A
= +25°C
C/E temp ranges
5.2
3.4
2.4
2.4
3.0
3.8
3.0
3.8
4.3
5.8
6.2
8.0
µA
CONDITIONS
MIN
TYP
MAX
UNITS
Supply Current
HYST = REF,
IN+ = (IN- +
100mV)
_______________________________________________________________________________________
3
Ultra-Low-Power, Open-Drain,
Single/Dual-Supply Comparators
MAX971–MAX974/MAX981–MAX984
ELECTRICAL CHARACTERISTICS—3V OPERATION (continued)
(V+ = 3V, V- = GND = 0V, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C.) (Note 1)
PARAMETER
Response Time (High-to-Low
Transition)
Response Time (Low-to-High
Transition) (Note 3)
Output Low Voltage
Output Leakage Current
REFERENCE
MAX971/MAX973/
MAX974
Reference Voltage
MAX981–MAX984
Source Current
Sink Current
Voltage Noise
T
A
= +25°C
C/E temp ranges
T
A
= +25°C
C/E temp ranges
100Hz to 100kHz
C temp range
E temp range
C temp range
E temp range
1%
2%
2%
3%
1.170
1.158
1.158
1.147
15
6
8
4
100
15
25
1.182
1.182
1.194
1.206
1.206
1.217
µA
µA
µV
RMS
V
CONDITIONS
T
A
= +25°C, 100pF load,
1MΩ pullup to V+
Overdrive = 10mV
Overdrive = 100mV
MIN
TYP
12
4
300
V- + 0.4
GND + 0.4
100
MAX
UNITS
µs
µs
V
nA
T
A
= +25°C, 100pF load, 1MΩ pullup to V+
MAX9_2/MAX9_3, I
OUT
= 0.8mA
MAX9_1/MAX9_4, I
OUT
= 0.8mA
V
OUT
= 11V
Note 1:
The MAX972EBL is 100% tested at T
A
= +25°C. Temperature limits are guaranteed by design.
Note 2:
MAX974/MAX984 comparators work below 2.5V; see
Low-Voltage
Operation section for more details.
Note 3:
Low-to-high response time is the result of the 1MΩ pullup and the 100pF capacitive load, based on three time constants.
A faster response time is achieved with a smaller RC.
4
_______________________________________________________________________________________
Ultra-Low-Power, Open-Drain,
Single/Dual-Supply Comparators
__________________________________________Typical Operating Characteristics
(V+ = 5V, V- = GND = 0V, T
A
= +25°C, unless otherwise noted.)
OUTPUT VOLTAGE LOW
vs. LOAD CURRENT
MAX971-4/981-4-TOC1
MAX971–MAX974/MAX981–MAX984
REFERENCE OUTPUT VOLTAGE vs.
OUTPUT LOAD CURRENT
MAX971-4/981-4 TOC2
MAX971/MAX973/MAX974
REFERENCE VOLTAGE vs. TEMPERATURE
1.21
REFERENCE VOLTAGE (V)
1.20
1.19
1.18
1.17
1.16
1.15
1.14
EXTENDED TEMP RANGE
COMMERCIAL
TEMP RANGE
MAX971-4/981-4 TOC3
2.5
V+ = 5V
1.190
REFERENCE OUTPUT VOLTAGE (V)
SINK
1.185
1.180
SOURCE
1.175
1.170
1.165
1.160
1.155
V+ = 5V
OR
V+ = 3V
0
5
10
15
20
25
1.22
2.0
V+ = 3V
V
OL
(V)
1.5
1.0
0.5
0
0
4
8
12
16
20
LOAD CURRENT (mA)
30
-60 -40 -20 0
20 40 60 80 100 120 140
OUTPUT LOAD CURRENT (µA)
TEMPERATURE (°C)
MAX9_1
SUPPLY CURRENT vs.
TEMPERATURE
MAX971-4/981-4 TOC4
MAX972
SUPPLY CURRENT vs. TEMPERATURE
MAX971-4/981-4 TOC5
MAX982/MAX9_3
SUPPLY CURRENT vs. TEMPERATURE
MAX971-4/981-4 TOC6
4.5
IN+ = IN- + 100mV
SUPPLY CURRENT (µA)
4.0
V+ = 5V, V- = - 5V
4.5
IN+ = (IN- + 100mV)
4.0
SUPPLY CURRENT (µA)
3.5
V+ = 10V, V- = 0V
3.0
2.5
V+ = 5V, V- = 0V
2.0
V+ = 3V, V- = 0V
1.5
5.0
4.5
SUPPLY CURRENT (µA)
4.0
V+ = 5V, V- = 0V
3.5
3.0
2.5
V+ = 3V, V- = 0V
2.0
3.5
3.0
V+ = 3V, V- = 0V
2.5
V+ = 5V, V- = 0V
2.0
-60
-20
20
60
100
140
TEMPERATURE (°C)
-60
-20
20
60
100
140
-60
-20
20
60
100
140
TEMPERATURE (°C)
TEMPERATURE (°C)
MAX9_4
SUPPLY CURRENT vs. TEMPERATURE
MAX971-4/981-4
TOC7
MAX9_4
SUPPLY CURRENT vs.
LOW SUPPLY VOLTAGES
MAX971-4/981-4 TOC8
MAX9_1/MAX982/MAX9_3
HYSTERESIS CONTROL
60
40
IN+ - IN- (V)
20
0
-20
-40
OUTPUT LOW
-60
-80
NO CHANGE
MAX971-4/981-4 TOC9
10
IN+ = (IN- + 100mV)
9
SUPPLY CURRENT (µA)
8
7
6
5
4
3
-60
-20
20
60
100
V+ = 5V, V- = 0V
V+ = 3V, V- = 0V
V+ = 5V, V- = -5V
10
80
OUTPUT HIGH
SUPPLY CURRENT (µA)
1
0.1
140
0.01
1.0
1.5
2.0
2.5
SINGLE-SUPPLY VOLTAGE (V)
0
10
20
30
40
50
TEMPERATURE (°C)
V
REF
- V
HYST
(mV)
_______________________________________________________________________________________
5
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