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19-0115; Rev 6; 4/09
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.
MAX921
MAX922
MAX923
MAX924
Yes
No
Yes
Yes
1
Yes
8-Pin
DIP/SO/µMAX
2
No
8-Pin
DIP/SO/µMAX
2
Yes
8-Pin
DIP/SO/µMAX
4
No
16-Pin
DIP/SO/µMAX
________________________Applications
Battery-Powered Systems
Threshold Detectors
Window Comparators
Oscillator Circuits
µMAX is a registered trademark of Maxim Integrated Products, Inc.
____________________________Features
µMAX® Package—Smallest 8-Pin SO
(MAX921/MAX922/MAX923)
Ultra-Low 4µA Max Quiescent Current
Over Extended Temp. Range (MAX921)
Power Supplies:
Single +2.5V to +11V
Dual ±1.25V to ±5.5V
Input Voltage Range Includes Negative Supply
Internal 1.182V ±1% Bandgap Reference
Adjustable Hysteresis
TTL/CMOS-Compatible Outputs
12µs Propagation Delay (10mV Overdrive)
No Switching Crowbar Current
40mA Continuous Source Current
Ordering Information
PART
TEMP RANGE PIN-PACKAGE
MAX921CPA
0°C to +70°C
8 Plastic DIP
MAX921CSA
0°C to +70°C
8 SO
MAX921CUA
0°C to +70°C
8 µMAX
MAX921C/D
0°C to +70°C
Dice*
MAX921EPA
-40°C to +85°C
8 Plastic DIP
MAX921ESA
-40°C to +85°C
8 SO
MAX921MJA
-55°C to +125°C 8 CERDIP
Ordering Information continued at end of data sheet.
*Dice are tested at TA = +25°C, DC parameters only.
**Contact factory for availability.
__________Typical Operating Circuit
VIN
7
V+
3 IN+
4 IN-
OUT 8
5 HYST
6 REF
V-
2
MAX921
GND
1
THRESHOLD DETECTOR
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim's website at www.maxim-ic.com.
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Ultra Low-Power,
Single/Dual-Supply Comparators
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
Current, OUT_ .................................................................50mA
Voltage, REF ....................................(V+ + 0.3V) to (V- – 0.3V)
Voltage, OUT_ (MAX921/924) .....(V+ + 0.3V) to (GND – 0.3V)
Voltage OUT_ (MAX922/923)...........(V+ + 0.3V) to (V- – 0.3V)
OUT_ Short-Circuit Duration (V+ 5.5V) ...............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:
MAX92_C_ _ .......................................................0°C to +70°C
MAX92_E_ _.....................................................-40°C to +85°C
MAX92_MJ_ ..................................................-55°C to +125°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
Stresses beyond those listed under “Absolute Maximum Ratings‘” may cause permanent damage to the device. These are stress ratin gs only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specificatio ns 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, TA = TMIN to TMAX, unless otherwise noted.)
PARAMETER
CONDITIONS
MIN TYP MAX
POWER REQUIREMENTS
Supply Voltage Range
Supply Current
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
(Note 1)
2.5 11
TA = +25°C
MAX921,
HYST = REF
C/E temp. ranges
M temp. range
2.5 3.2
4
5
TA = +25°C
2.5 3.2
MAX922 C/E temp. ranges
4
IN+ = IN- + 100mV
MAX923,
HYST = REF
M temp. range
TA = +25°C
C/E temp. ranges
M temp. range
5
3.1 4.5
6
7.5
TA = +25°C
5.5 6.5
MAX924 C/E temp. ranges
8.5
M temp. range
11
VCM = 2.5V
IN+ = IN- = 2.5V
MAX921, MAX923
V- to (V+ – 1.3V)
V+ = 2.5V to 11V
100Hz to 100kHz
MAX921, MAX923
TA = +25°C, 100pF load
±10
C/E temp. ranges
±0.01
±5
M temp. range
±40
±0.02
V- V+ – 1.3
0.1 1.0
0.1 1.0
20
REF- 0.05V
REF
Overdrive = 10mV
12
Overdrive = 100mV
4
UNITS
V
µA
mV
nA
nA
V
mV/V
mV/V
µVRMS
V
µs
2 _______________________________________________________________________________________
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Ultra Low-Power,
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ELECTRICAL CHARACTERISTICS: 5V OPERATION (continued)
(V+ = 5V, V- = GND = 0V, TA = TMIN to TMAX, unless otherwise noted.)
PARAMETER
CONDITIONS
MIN TYP MAX
Output High Voltage
MAX92_
C/E temp. ranges: IOUT = 17mA;
M temp. range: IOUT = 10mA
V+ – 0.4
Output Low Voltage
MAX922/
MAX923
MAX921/
MAX924
C/E temp. ranges: IOUT = 1.8mA;
M temp. range: IOUT = 1.2mA
C/E temp. ranges: IOUT = 1.8mA;
M temp. range: IOUT = 1.2mA
XREFERENCE (MAX921/MAX923/MAX924 ONLY)
C temp. range
Reference Voltage
E temp. range
M temp. range
TA = +25°C
Source Current
C/E temp. ranges
M temp. range
Sink Current
TA = +25°C
C/E temp. ranges
M temp. range
Voltage Noise
100Hz to 100kHz
1.170
1.158
1.147
15
6
4
8
4
2
V- + 0.4
GND + 0.4
1.182
25
1.194
1.206
1.217
15
100
Note 1: MAX924 comparators work below 2.5V, see Low-Voltage Operation section for more details.
UNITS
V
V
V
µA
µA
µVRMS
ELECTRICAL CHARACTERISTICS: 3V OPERATION
(V+ = 3V, V- = GND = 0V, TA = TMIN to TMAX, unless otherwise noted.)
PARAMETER
POWER REQUIREMENTS
Supply Current
COMPARATOR
Input Offset Voltage
Input Leakage Current (IN-, IN+)
Input Leakage Current (HYST)
CONDITIONS
MIN TYP
MAX921
MAX922
HYST = REF,
IN+ = (IN- + 100mV)
MAX923
MAX924
TA = +25°C
C/E temp. ranges
M temp. range
TA = +25°C
C/E temp. ranges
M temp. range
TA = +25°C
C/E temp. ranges
M temp. range
TA = +25°C
C/E temp. ranges
M temp. range
VCM = 1.5V
IN+ = IN- = 1.5V
MAX921, MAX923
C/E temp. ranges
M temp. range
2.4
2.4
3.4
5.2
±0.01
±0.02
MAX UNITS
3.0
3.8
4.8
3.0
3.8
4.8 µA
4.3
5.8
7.2
6.2
8.0
10.5
±10 mV
±5
nA
±40
nA
_______________________________________________________________________________________ 3
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ELECTRICAL CHARACTERISTICS: 3V OPERATION (continued)
(V+ = 3V, V- = GND = 0V, TA = TMIN to TMAX, unless otherwise noted.)
PARAMETER
Input Common-Mode Voltage Range
Common-Mode Rejection Ratio
Power-Supply Rejection Ratio
Voltage Noise
Hysteresis Input Voltage Range
Response Time
Output High Voltage
Output Low Voltage
REFERENCE
Reference Voltage
Source Current
Sink Current
Voltage Noise
CONDITIONS
MIN TYP MAX
V- to (V+ – 1.3V)
V+ = 2.5V to 11V
100Hz to 100kHz
MAX921, MAX923
TA = +25°C, 100pF load
V-
0.2
0.1
20
REF- 0.05V
Overdrive = 10mV
14
Overdrive = 100mV
5
V+ – 1.3
1
1
REF
MAX92_
C/E temp. ranges: IOUT = 10mA;
M temp. range: IOUT = 6mA
V+ – 0.4
MAX922/ C/E temp. ranges: IOUT = 0.8mA;
MAX923 M temp. range: IOUT = 0.6mA
V- + 0.4
MAX921/ C/E temp. ranges: IOUT = 0.8mA;
MAX924 M temp. range: IOUT = 0.6mA
GND + 0.4
100Hz to 100kHz
C temp. range
E temp. range
M temp. range
TA = +25°C
C/E temp. ranges
M temp. range
TA = +25°C
C/E temp. ranges
M temp. range
1.170
1.158
1.147
15
6
4
8
4
2
1.182
25
15
100
1.194
1.206
1.217
UNITS
V
mV/V
mV/V
µVRMS
V
µs
V
V
V
µA
µA
µVRMS
(V+ = 5V, V- = GND, TA = +25°C, unless otherwise noted).
Typical Operating Characteristics
OUTPUT VOLTAGE LOW
vs. LOAD CURRENT
2.5
V+ = 5V
2.0
V+ = 3V
1.5
OUTPUT VOLTAGE HIGH vs.
LOAD CURRENT
5.0
V+ = 5V
4.5
4.0
3.5
1.190
1.185
1.180
1.175
REFERENCE OUTPUT VOLTAGE vs.
OUTPUT LOAD CURRENT
SINK
SOURCE
1.0
0.5
0.0
0
4 8 12 16
LOAD CURRENT (mA)
20
3.0
2.5
2.0
1.5
0
V+ = 3V
10 20 30 40
LOAD CURRENT (mA)
50
1.170
1.165
1.160
V+ = 5V
OR
V+ = 3V
1.155
0
5 10 15 20 25
OUTPUT LOAD CURRENT (μA)
30
4 _______________________________________________________________________________________
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Ultra Low-Power,
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Typical Operating Characteristics (continued)
(V+ = 5V, V- = GND, TA = +25°C, unless otherwise noted).
REFERENCE VOLTAGE
vs. TEMPERATURE
1.22
1.21 MILITARY TEMP. RANGE
EXTENDED TEMP. RANGE
1.20
1.19 COMMERCIAL
TEMP. RANGE
1.18
1.17
1.16
1.15
1.14
-60 -40 -20 0 20 40 60 80 100 120 140
TEMPERATURE (°C)
MAX923
SUPPLY CURRENT vs. TEMPERATURE
5.0
4.5
4.0
V+ = 5V, V- = 0V
3.5
3.0
MAX921
SUPPLY CURRENT vs.
TEMPERATURE
4.5
IN+ = (IN- + 100mV)
4.0
V+ = 5V, V- = - 5V
3.5
3.0
V+ = 3V, V- = 0V
2.5
2.0
-60
V+ = 5V, V- = 0V
-20 20 60 100
TEMPERATURE (°C)
140
MAX924
SUPPLY CURRENT vs. TEMPERATURE
10
IN+ = (IN- + 100mV)
9
8
7
V+ = 5V, V- = -5V
6
5 V+ = 5V, V- = 0V
MAX922
SUPPLY CURRENT vs. TEMPERATURE
4.5
IN+ = (IN- + 100mV)
4.0
3.5
V+ = 10V, V- = 0V
3.0
2.5
2.0
1.5
-60
10
V+ = 5V, V- = 0V
V+ = 3V, V- = 0V
-20 20 60 100
TEMPERATURE (°C)
MAX924
SUPPLY CURRENT vs.
LOW SUPPLY VOLTAGES
140
1
0.1
2.5
2.0
-60
V+ = 3V, V- = 0V
-20 20 60 100
TEMPERATURE (°C)
140
4
3
-60
V+ = 3V, V- = 0V
-20 20 60 100
TEMPERATURE (°C)
0.01
140 1.0
1.5 2.0
SINGLE-SUPPLY VOLTAGE (V)
2.5
HYSTERESIS CONTROL
80
60
OUTPUT HIGH
40
20
TRANSFER FUNCTION
5.0
4.5 100k
V0
4.0
10μF
3.5
3.0
RESPONSE TIME vs.
LOAD CAPACITANCE
18
V- = 0V
16
14
VOHL
12
0 NO CHANGE 2.5
10
-20
-40
OUTPUT LOW
-60
2.0
1.5
1.0
0.5
8
VOLH
6
4
-80
0
10 20 30 40
VREF -VHYST (mV)
50
0
-0.3
-0.2 -0.1 0 0.1 0.2
IN+ INPUT VOLTAGE (mV)
0.3
2
0
20 40 60 80
LOAD CAPACITANCE (nF)
100
_______________________________________________________________________________________ 5
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