_______________General Description
The MAX971MAX974 and MAX981MAX984 single/
dual/quad low-voltage comparators feature the lowest
power consumption available. These micropower
devices draw less than 4A supply current over
temperature (MAX971/MAX972, MAX981/MAX982), and
include an internal 1.182V 1% (MAX971/MAX973/
MAX974) or 2% (MAX981MAX984) 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 MAX971MAX974 and MAX981MAX984'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 MAX921MAX924 (1% reference)
and the MAX931MAX934 (2% reference).
____________________________Features
o
MAX Package--Smallest 8-Pin SO
(MAX9_1/MAX9_2/MAX9_3)
o
Ultra-Low 4A Max Quiescent Current
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 1.182V 1% Bandgap Reference
o
12s Propagation Delay (10mV Overdrive)
o
Output Has Separate GND Pin (MAX9_1/MAX9_4)
________________________Applications
Battery-Powered Systems
Level Translators
Threshold Detectors
Oscillator Circuits
Window Comparators
MAX971MAX974/MAX981MAX984
Ultra-Low-Power, Open-Drain,
Single/Dual-Supply Comparators
________________________________________________________________
Maxim Integrated Products
1
MAX971
MAX981
OUT
IN+
HYST
REF
V-
GND
V+
2
1
4
5
6
8
3
7
IN-
THRESHOLD DETECTOR
V
IN
__________Typical Operating Circuit
Call toll free 1-800-998-8800 for free samples or literature.
19-0450; Rev 0; 11/95
PART
TEMP. RANGE
PIN-PACKAGE
MAX971
CPA
0C to +70C
8 Plastic DIP
MAX971CSA
0C to +70C
8 SO
MAX971C/D
0C to +70C
Dice*
MAX971CUA
0C to +70C
8 MAX
______________Ordering Information
Ordering Information continued at end of data sheet.
* Dice are tested at T
A
= +25C, DC parameters only.
PART
INTERNAL
PRECISION
REFERENCE
INTERNAL
HYSTERESIS
PACKAGE
MAX971
1%
Yes
8-Pin
DIP/SO/MAX
MAX972
None
No
8-Pin
DIP/SO/MAX
MAX973
1%
Yes
8-Pin
DIP/SO/MAX
MAX974
1%
No
16-Pin DIP/SO
MAX981
2%
Yes
8-Pin
DIP/SO/MAX
MAX982
2%
Yes
8-Pin
DIP/SO/MAX
MAX983
2%
Yes
8-Pin
DIP/SO/MAX
MAX984
2%
No
16-Pin DIP/SO
COMPARATORS
PER
PACKAGE
1
2
2
4
1
2
2
4
MAX971MAX974/MAX981MAX984
Ultra-Low-Power, Open-Drain,
Single/Dual-Supply Comparators
2
_______________________________________________________________________________________
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
= +70C)
8-Pin Plastic DIP (derate 9.09mW/C above +70C) ...727mW
8-Pin SO (derate 5.88mW/C above +70C)................471mW
8-Pin MAX (derate 4.1mW/C above +70C) .............330mW
8-Pin CERDIP (derate 8.00mW/C above +70C)........640mW
16-Pin Plastic DIP (derate 10.53mW/C above +70C)..842mW
16-Pin SO (derate 8.70mW/C above +70C) ................696mW
16-Pin CERDIP (derate 10.00mW/C above +70C) ......800mW
Operating Temperature Ranges
MAX97_C_ _/MAX98_C_ _ ..................................0C to +70C
MAX97_E_ _/MAX98_E_ _ ...............................-40C to +85C
MAX97_MJ_/MAX98_MJ_ .............................-55C to +125C
Storage Temperature Range .............................-65C to +150C
Lead Temperature (soldering, 10sec) .............................+300C
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
= +25C.)
PARAMETER
MAX982/
MAX9_3,
HYST = REF
MIN TYP MAX
UNITS
MAX9_4
7.5
V
V-
V+ - 1.3
5.5
6.5
MAX9_1,
HYST = REF
8.5
Supply Current
IN+ = IN- + 100mV
IN+ = IN- = 2.5V
11
A
Supply Voltage Range
T
A
= +25C, 100pF load,
1M
pull-up to V+
2.5
11
V
2.5
3.2
MAX972
4
5
2.5
3.2
Input Offset Voltage
CONDITIONS
M temp. range
10
mV
T
A
= +25C
C/E temp. ranges
M temp. range
0.01
5
nA
Input Leakage Current (IN-, IN+)
(Note 1)
40
Input Leakage Current (HYST)
T
A
= +25C
C/E temp. ranges
M temp. range
0.02
nA
Input Common-Mode Voltage Range
T
A
= +25C
V
CM
= 2.5V
C/E temp. ranges
Common-Mode Rejection Ratio
M temp. range
MAX9_1/MAX982/MAX9_3
0.1
1.0
mV/V
Power-Supply Rejection Ratio
V- to (V+ - 1.3V)
V+ = 2.5V to 11V
100Hz to 100kHz
0.1
1.0
mV/V
Voltage Noise
MAX9_1/MAX982/MAX9_3
Overdrive = 10mV
Overdrive = 100mV
20
V
RMS
Hysteresis Input Voltage Range
REF - 0.05
REF
V
C/E temp. ranges
M temp. range
T
A
= +25C
12
s
Response Time
(high-to-low transition)
C/E temp. ranges
4
4
5
3.1
4.5
6
Output Voltage Range
0
11
V
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
T
A
= +25C, 100pF load, 1M
pull-up to V+
300
s
Response Time
(low-to-high transition) (Note 2)
POWER REQUIREMENTS
COMPARATOR
MAX971MAX974/MAX981MAX984
Ultra-Low-Power, Open-Drain,
Single/Dual-Supply Comparators
_______________________________________________________________________________________
3
PARAMETER
Voltage Noise
MIN TYP MAX
UNITS
100Hz to 100kHz
100
V
RMS
MAX9_2/MAX9_3, I
OUT
= 1.8mA for C/E temp. ranges,
I
OUT
= 1.2mA for M temp. range
MAX9_1/MAX9_4, I
OUT
= 1.8mA for C/E temp. ranges,
I
OUT
= 1.2mA for M temp. range
CONDITIONS
C temp. range
E temp. range
M temp. range
T
A
= +25C
V- + 0.4
V
15
25
A
C/E temp. ranges
6
Source Current
M temp. range
4
GND + 0.4
Output Low Voltage
X
1.170
1.182
1.194
V
1.158
1.206
Reference Voltage
1.147
1.217
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
= +25C.)
ELECTRICAL CHARACTERISTICS: 3V OPERATION
(V+ = 5V, V- = GND = 0V, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25C.)
PARAMETER
MAX982/
MAX9_3
MIN TYP MAX
UNITS
MAX9_4
7.2
5.2
6.2
MAX9_1
8.0
Supply Current
HYST = REF,
IN+ = (IN- + 100mV)
IN+ = IN- = 1.5V
10.5
A
2.4
3.0
MAX972
3.8
4.8
2.4
3.0
Input Offset Voltage
CONDITIONS
M temp. range
10
mV
T
A
= +25C
C/E temp. ranges
M temp. range
0.01
5
nA
Input Leakage Current (IN-, IN+)
40
Input Leakage Current (HYST)
T
A
= +25C
C/E temp. ranges
M temp. range
0.02
nA
T
A
= +25C
V
CM
= 1.5V
C/E temp. ranges
M temp. range
MAX9_1/MAX982/MAX9_3
C/E temp. ranges
M temp. range
T
A
= +25C
C/E temp. ranges
3.8
4.8
3.4
4.3
5.8
V
OUT
= 11V
100
nA
Output Leakage Current
Input Common-Mode Voltage Range
V-
V+ - 1.3
V
Power-Supply Rejection Ratio
0.1
1
mV/V
V+ = 2.5V to 11V
Common-Mode Rejection Ratio
0.2
1
mV/V
V- to (V+ - 1.3V)
POWER REQUIREMENTS
COMPARATOR
T
A
= +25C
8
15
A
C/E temp. ranges
4
Sink Current
M temp. range
2
REFERENCE
(MAX9_1/MAX982/MAX9_3/MAX9_4 ONLY)
MAX971MAX974/MAX981MAX984
Ultra-Low-Power, Open-Drain,
Single/Dual-Supply Comparators
4
_______________________________________________________________________________________
__________________________________________Typical Operating Characteristics
(V+ = 5V, V- = GND, T
A
= +25C, unless otherwise noted.)
0
0
20
OUTPUT VOLTAGE LOW
vs. LOAD CURRENT
0.5
2.5
MAX971/4-TOC1
LOAD CURRENT (mA)
V
OL
(V)
12
1.5
1.0
4
8
16
2.0
V+ = 5V
V+ = 3V
1.155
0
5
15
25
REFERENCE OUTPUT VOLTAGE vs.
OUTPUT LOAD CURRENT
1.165
1.185
MAX971/4-TOC2
OUTPUT LOAD CURRENT (
A)
REFERENCE OUTPUT VOLTAGE (V)
10
20
1.175
1.190
1.160
1.180
1.170
V+ = 5V
OR
V+ = 3V
30
SINK
SOURCE
1.22
1.14
-60
-20
60
140
MAX971/MAX973/MAX974
REFERENCE VOLTAGE vs. TEMPERATURE
1.16
1.20
MAX971/4-TOC3
TEMPERATURE (
C)
REFERENCE VOLTAGE (V)
20
100
1.18
1.21
1.15
1.19
1.17
-40
0
80
40
120
MILITARY TEMP. RANGE
EXTENDED TEMP. RANGE
COMMERCIAL
TEMP. RANGE
ELECTRICAL CHARACTERISTICS: 3V OPERATION (continued)
(V+ = 5V, V- = GND = 0V, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25C.)
CONDITIONS
Output Low Voltage
GND + 0.4
V
V- + 0.4
MAX9_1/MAX9_4, I
OUT
= 0.8mA for C/E temp. ranges,
I
OUT
= 0.6mA for M temp. range
MAX9_2/MAX9_3, I
OUT
= 0.8mA for C/E temp. ranges,
I
OUT
= 0.6mA for M temp. range
s
4
T
A
= +25C, 100pF load,
1M
pull-up to V+
Overdrive = 100mV
Response Time
(high-to-low transition)
V
RMS
20
100Hz to 100kHz
Voltage Noise
V
12
REF - 0.05
REF
Overdrive = 10mV
MAX9_1/MAX982/MAX9_3
Output Leakage Current
nA
100
Hysteresis Input Voltage Range
V
OUT
= 11V
UNITS
MIN TYP MAX
PARAMETER
1.158
1.206
1.170
1.182
1.194
15
25
Reference Voltage
V
1.147
1.217
Source Current
A
4
6
Voltage Noise
V
RMS
100
100Hz to 100kHz
C temp. range
E temp. range
M temp. range
T
A
= +25C
C/E temp. ranges
M temp. range
s
300
T
A
= +25C, 100pF load, 1M
pull-up to V+
Response Time
(low-to-high transition) (Note 2)
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 1M
pull-up and the 100pF capacitive load, based on three time constants.
A faster response time is achieved with a smaller RC.
4
8
15
Sink Current
A
2
T
A
= +25C
C/E temp. ranges
M temp. range
REFERENCE
MAX971MAX974/MAX981MAX984
Ultra-Low-Power, Open-Drain,
Single/Dual-Supply Comparators
_______________________________________________________________________________________
5
2.0
-60
140
MAX9_1
SUPPLY CURRENT vs.
TEMPERATURE
2.5
4.5
MAX971/4-TOC4
TEMPERATURE (
C)
SUPPLY CURRENT (
A)
60
3.5
3.0
-20
20
100
4.0
V+ = 5V, V- = - 5V
V+ = 3V, V- = 0V
V+ = 5V, V- = 0V
IN+ = IN- + 100mV
4.5
1.5
-60
140
MAX972
SUPPLY CURRENT vs. TEMPERATURE
2.0
4.0
MAX971/4-TOC5
TEMPERATURE (
C)
SUPPLY CURRENT (
A)
60
3.0
2.5
-20
20
100
3.5
IN+ = (IN- + 100mV)
V+ = 5V, V- = 0V
V+ = 3V, V- = 0V
V+ = 10V, V- = 0V
4.5
5.0
-60
140
MAX982/MAX9_3
SUPPLY CURRENT vs. TEMPERATURE
2.0
4.0
MAX971/4-TOC6
TEMPERATURE (
C)
SUPPLY CURRENT (
A)
60
3.0
2.5
-20
20
100
3.5
V+ = 5V, V- = 0V
V+ = 3V, V- = 0V
10
3
-60
140
MAX9_4
SUPPLY CURRENT vs. TEMPERATURE
4
8
MAX971/4-TOC7
TEMPERATURE (
C)
SUPPLY CURRENT (
A)
60
6
5
-20
20
100
7
9
IN+ = (IN- + 100mV)
V+ = 5V, V- = 0V
V+ = 3V, V- = 0V
V+ = 5V, V- = -5V
5.0
0
-0.3
-0.1
0.3
MAX9_1/MAX972/MAX9_4
TRANSFER FUNCTION
1.0
4.0
MAX971/4-TOC10
IN+ INPUT VOLTAGE (mV)
OUTPUT VOLTAGE (V)
0.1
3.0
2.0
4.5
0.5
3.5
2.5
1.5
-0.2
0
0.2
100k
+5V
10k
V
0
10
F
10
0.01
1.0
2.0
2.5
MAX9_4
SUPPLY CURRENT vs.
LOW SUPPLY VOLTAGES
0.1
1
MAX971/4-TOC8
SINGLE-SUPPLY VOLTAGE (V)
SUPPLY CURRENT (
A)
1.5
80
-80
0
10
30
50
MAX9_1/MAX982/MAX9_3
HYSTERESIS CONTROL
-40
40
MAX971/4 TOC9
V
REF
-V
HYST
(mV)
IN+ - IN- (V)
20
40
0
60
-60
20
-20
NO CHANGE
OUTPUT LOW
OUTPUT HIGH
18
2
0
20
60
100
RESPONSE TIME vs.
LOAD CAPACITANCE
6
14
MAX971/4 TOC11
LOAD CAPACITANCE (nF)
RESPONSE TIME (
s)
40
80
10
16
4
12
8
V- = 0V
V
OHL
-2
2
10
18
RESPONSE TIME FOR VARIOUS
INPUT OVERDRIVES (V
OHL
)
0
4
MAX971/4-TOC12
RESPONSE TIME (
s)
V
OUT
(V)
6
14
2
0
5
100
3
1
50mV
100mV
20mV
10mV
V
IN
(mV)
____________________________Typical Operating Characteristics (continued)
(V+ = 5V, V- = GND, T
A
= +25C, unless otherwise noted.)
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