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19-1842; Rev 2; 1/07
Micropower, Ultra-Small, Single/Dual/Quad,
Single-Supply Comparators
General Description
The MAX9021/MAX9022/MAX9024 single/dual/quad
comparators are optimized for low-power consumption
while still providing a fast output response. They are
designed for single-supply applications from 2.5V to
5.5V, but can also operate from dual supplies. These
comparators have a 3µs propagation delay and con-
sume 2.8µA of supply current per comparator over the
-40°C to +125°C operating temperature range. The
combination of low-power, single-supply operation
down to 2.5V, and ultra-small footprint makes these
devices ideal for portable applications.
The MAX9021/MAX9022/MAX9024 have 4mV of built-in
hysteresis to provide noise immunity and prevent oscil-
lations even with a slow-moving input signal. The input
common-mode range extends from the negative supply
to within 1.1V of the positive supply. The design of the
comparator-output stage substantially reduces switch-
ing current during output transitions, eliminating power-
supply glitches.
The MAX9021 single comparator is available in tiny 5-
pin SC70 and SOT23 packages. The MAX9022 dual
comparator is available in 8-pin SOT23, µMAX®, and
SO packages, and the MAX9024 quad comparator is
available in 14-pin TSSOP and SO packages.
Applications
Battery-Powered
Portable Systems
Mobile Communications
Sensor-Signal Detection
Photodiode Preamps
Digital Line Receivers
Keyless Entry Systems
Threshold Detectors/
Discriminators
Features
Low-Cost Solution Available in Space-Saving
SC70 Packages (Half the Size of SOT23)
Low 2.8µA Supply Current
3µs Propagation Delay
Internal 4mV Comparator Hysteresis
Comparator Output Swings Rail-to-Rail
2.5 to 5.5V Single-Supply Voltage Range
No Phase Reversal for Overdriven Inputs
Space-Saving Packages
5-Pin SC70 (MAX9021)
8-Pin SOT23 (MAX9022)
8-Pin µMAX (MAX9022)
14-Pin TSSOP (MAX9024)
Ordering Information
PART
TEMP RANGE PIN-
PACKAGE
MAX9021AXK-T -40°C to +125°C 5 SC70-5
MAX9021AUK-T -40°C to +125°C 5 SOT23-5
MAX9022AKA-T -40°C to +125°C 8 SOT23-8
MAX9022AUA -40°C to +125°C 8 µMAX
MAX9022ASA -40°C to +125°C 8 SO
MAX9024AUD -40°C to +125°C 14 TSSOP
MAX9024ASD -40°C to +125°C 14 SO
PKG
CODE
X5-1
U5-1
K8-5
U8-1
S8-2
U14-1
S14-2
Typical Application Circuit appears at end of data sheet.
Pin Configurations
TOP VIEW
IN+ 1
5 VDD
MAX9021
VSS 2
IN- 3
4 OUT
SC70/SOT23
OUTA 1
INA- 2
INA+ 3
VSS 4
MAX9022
8 VDD
7 OUTB
6 INB-
5 INB+
S0T23/µMAX/SO
OUTA 1
INA- 2
INA+ 3
VDD 4
INB+ 5
INB- 6
OUTB 7
MAX9024
14 OUTD
13 IND-
12 IND+
11 VSS
10 INC+
9 INC-
8 OUTC
TSSOP/SO
µMAX is a registered trademark of Maxim Integrated Products, Inc.
________________________________________________________________ Maxim Integrated Products 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.

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Micropower, Ultra-Small, Single/Dual/Quad,
Single-Supply Comparators
ABSOLUTE MAXIMUM RATINGS
Supply Voltage (VDD to VSS) ....................................-0.3V to +6V
Voltage Inputs (IN+, IN- to VSS). ................-0.3V to (VDD + 0.3V)
Differential Input Voltage (IN+ to IN-)....................................6.6V
Current into Input Pins ......................................................±20mA
Output Short-Circuit Duration ..................2s to Either VDD or VSS
Current into Any Pin ............................................................20mA
Continuous Power Dissipation (TA = +70°C)
5-Pin SC70 (derate 3.1mW/°C above +70°C) ...............247mW
5-Pin SOT23 (derate 7.1mW/°C above +70°C).............571mW
8-Pin SOT23 (derate 9.1mW/°C above +70°C).............727mW
8-Pin µMAX (derate 4.5mW/°C above +70°C) ..............362mW
8-Pin SO (derate 5.88mW/°C above +70°C).................471mW
14-Pin TSSOP (derate 9.1mW/°C above +70°C) ..........727mW
14-Pin SO (derate 8.3mW/°C above +70.......................667mW
Operating Temperature Range
Automotive Application...................................-40°C to +125°C
Junction Temperature ......................................................+150°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 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
(VDD = 5V, VSS = 0, VCM = 0, TA = -40°C to +125°C, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1)
PARAMETER
Operating Voltage Range
Supply Current Per Comparator
Input Offset Voltage
Input Offset Voltage
Temperature Coefficient
SYMBOL
VDD
IDD
VOS
CONDITIONS
Guaranteed by PSRR test
(Note 2)
TCVOS
MIN TYP MAX UNITS
2.5 5.5 V
2.8 5 µA
±1 ±8 mV
±1 µV/°C
Hysteresis
Input Bias Current
Input Offset Current
Common-Mode Voltage Range
Common-Mode Rejection Ratio
IBIAS
IOS
VCM
CMRR
(Note 3)
Guaranteed by CMRR test
VSS VCM (VDD - 1.1V), VDD = 5.5V
4 mV
3 80 nA
±2 ±60 nA
VSS VDD - 1.1 V
70 100
dB
Power-Supply Rejection Ratio
PSRR VDD = 2.5V to 5.5V
60 80
dB
Output-Voltage Swing
Output Short-Circuit Current
Propagation Delay
Rise and Fall Time
Power-On Time
Maximum Capacitive Load
VOL, VOH
ISC
tpd+, tpd-
tR, tF
CL
VOH = VDD - VOUT,
(VIN+ - VIN-) 20mV
VOL = VOUT - VSS,
(VIN- - VIN+) 20mV
ISOURCE = 10µA
ISOURCE = 4mA
ISINK = 10µA
ISINK = 4mA
RL = 10k,
CL = 15pF (Note 4)
VOD = 10mV
VOD = 100mV
RL = 10k, CL = 15pF (Note 5)
RL = 10k, CL = 15pF
No sustained oscillations
2
160 400
mV
2
180 400
50 mA
8
µs
3
20 ns
150 ns
150 pF
Note 1: All devices are production tested at 25°C. All temperature limits are guaranteed by design.
Note 2: Comparator Input Offset is defined as the center of the hysteresis zone.
Note 3: Hysteresis is defined as the difference of the trip points required to change comparator output states.
Note 4: VOD is the overdrive voltage beyond the offset and hysteresis-determined trip points.
Note 5: Rise and fall times are measured between 10% and 90% at OUT.
2 _______________________________________________________________________________________

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Micropower, Ultra-Small, Single/Dual/Quad,
Single-Supply Comparators
Typical Operating Characteristics
(VDD = 5V, VSS = 0, VCM = 0, RL = 10k, CL = 15pF, VOD = 100mV, TA = +25°C, unless otherwise noted.)
SUPPLY CURRENT
vs. SUPPLY VOLTAGE
3.0
SUPPLY CURRENT vs. TEMPERATURE
3.0
SUPPLY CURRENT
vs. OUTPUT TRANSITION FREQUENCY
1000
2.9
2.8
2.7
2.6
2
345
SUPPLY VOLTAGE (V)
6
INPUT OFFSET VOLTAGE
vs. TEMPERATURE
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
-50 -25
0 25 50 75 100 125
TEMPERATURE (°C)
OUTPUT SHORT-CIRCUIT CURRENT
vs. TEMPERATURE
65
2.9
2.8
2.7
2.6
2.5
-50 -25
0 25 50 75 100 125
TEMPERATURE (°C)
OUTPUT HIGH VOLTAGE
vs. SOURCE CURRENT
500
400
300
200
100
0
0 2 4 6 8 10
SOURCE CURRENT (mA)
PROPAGATION DELAY vs. CAPACITIVE LOAD
(VDD = 2.7V)
5
100
10
1
0.01 0.1 1 10 100 1000
OUTPUT TRANSITION FREQUENCY (kHz)
OUTPUT LOW VOLTAGE
vs. SINK CURRENT
500
400
300
200
100
0
0 2 4 6 8 10
SINK CURRENT (mA)
PROPAGATION DELAY vs. CAPACITIVE LOAD
(VDD = 5V)
5
60
55
SOURCE CURRENT
50
SINK CURRENT
45
4
3
2
1
tPD-
tPD+
4
3
2
1
tPD-
tPD+
40
-50 -25
0 25 50 75 100 125
TEMPERATURE (°C)
0
0 500 1000 1500 2000
CAPACITIVE LOAD (pF)
0
0 500 1000 1500 2000
CAPACITIVE LOAD (pF)
_______________________________________________________________________________________ 3

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Micropower, Ultra-Small, Single/Dual/Quad,
Single-Supply Comparators
Typical Operating Characteristics (continued)
(VDD = 5V, VSS = 0, VCM = 0, RL = 10k, CL = 15pF, VOD = 100mV, TA = +25°C, unless otherwise noted.)
PROPAGATION DELAY
vs. TEMPERATURE
5
4
tPD-
3
2 tPD+
1
0
-50 -25
0 25 50 75 100 125
TEMPERATURE (°C)
PROPAGATION DELAY
vs. INPUT OVERDRIVE VOLTAGE
9
8
7
6
5
4 tPD-
3
2 tPD+
1
0
0 20 40 60 80 100 120 140
INPUT OVERDRIVE VOLTAGE (mV)
IN+
100mV/div
VOUT
2.5V/div
PROPAGATION DELAY (tPD+)
1µs/div
PROPAGATION DELAY (tPD-)
OUTPUT SWITCHING CURRENT, RISING
OUTPUT SWITCHING CURRENT, FALLING
IN+
100mV/div
VOUT
2.5V/div
1µs/div
10kHz RESPONSE
(VOD = 10mV)
IN+ - IN-
200mV/div
VOUT
5V/div
SWITCHING
CURRENT
400µA/div
20µs/div
10kHz RESPONSE
(VOD = 100mV)
IN+ - IN-
200mV/div
VOUT
5V/div
SWITCHING
CURRENT
400µA/div
20µs/div
POWER-UP TIME
IN+ - IN-
10mV/div
IN+ - IN-
100mV/div
VDD
2.5V/div
OUT
2.5V/div
OUT
2.5V/div
VOUT
2.5V/div
10µs/div
10µs/div
2µs/div
4 _______________________________________________________________________________________

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Micropower, Ultra-Small, Single/Dual/Quad,
Single-Supply Comparators
MAX9021
1
2
3
4
5
PIN
MAX9022
4
8
1
2
3
5
6
7
MAX9024
11
4
1
2
3
5
6
7
8
9
10
12
13
14
Pin Description
NAME
IN+
VSS
IN-
OUT
VDD
OUTA
INA-
INA+
INB+
INB-
OUTB
OUTC
INC-
INC+
IND+
IND-
OUTD
FUNCTION
Comparator Noninverting Input
Negative Supply Voltage
Comparator Inverting Input
Comparator Output
Positive Supply Voltage. Bypass with a 0.1µF capacitor to GND.
Comparator A Output
Comparator A Inverting Input
Comparator A Noninverting Input
Comparator B Noninverting Input
Comparator B Inverting Input
Comparator B Output
Comparator C Output
Comparator C Inverting Input
Comparator C Noninverting Input
Comparator D Noninverting Input
Comparator D Inverting Input
Comparator D Output
Detailed Description
The MAX9021/MAX9022/MAX9024 are single/dual/
quad, low-cost, low-power comparators that consume
only 2.8µA and provide a propagation delay, tPD, typi-
cally 3µs. They have an operating-supply voltage from
2.5V to 5.5V when operating from a single supply and
from ±1.25V to ±2.75V when operating from dual power
supplies. Their common-mode input voltage range
extends from the negative supply to within 1.1V of the
positive supply. Internal hysteresis ensures clean out-
put switching, even with slow-moving input signals.
Applications Information
Adding Hysteresis
Hysteresis extends the comparator’s noise margin by
increasing the upper threshold and decreasing the
lower threshold. A voltage-divider from the compara-
tor’s output sets the trip voltage. Therefore, the trip volt-
age is related to the output voltage.
These comparators have 4mV internal hysteresis.
Additional hysteresis can be generated with two resis-
tors, using positive feedback (Figure 1). Use the follow-
ing procedure to calculate resistor values:
1) Find the trip points of the comparator using these for-
mulas:
VTH = VREF + ((VDD - VREF)R2) / (R1 + R2)
VTL = VREF(1 - (R2 / (R1 + R2))
where VTH is the threshold voltage at which the com-
parator switches its output from high to low as VIN
rises above the trip point. VTL is the threshold volt-
age at which the comparator switches its output from
low to high as VIN drops below the trip point.
_______________________________________________________________________________________ 5