General Description
The MAX9117–MAX9120 nanopower comparators in
space-saving SC70 packages feature Beyond-the-
Rails™ inputs and are guaranteed to operate down to
+1.6V. The MAX9117/MAX9118 feature an on-board
1.252V ±1.75% reference and draw an ultra-low supply
current of only 600nA, while the MAX9119/MAX9120
(without reference) require just 350nA of supply current.
These features make the MAX9117–MAX9120 family of
comparators ideal for all 2-cell battery-monitoring/man-
agement applications.
The unique design of the output stage limits supply-cur-
rent surges while switching, virtually eliminating the sup-
ply glitches typical of many other comparators. This
design also minimizes overall power consumption under
dynamic conditions. The MAX9117/MAX9119 have a
push-pull output stage that sinks and sources current.
Large internal-output drivers allow rail-to-rail output
swing with loads up to 5mA. The MAX9118/MAX9120
have an open-drain output stage that makes them suit-
able for mixed-voltage system design. All devices are
available in the ultra-small 5-pin SC70 package.
Applications
2-Cell Battery Monitoring/Management
Ultra-Low-Power Systems
Mobile Communications
Notebooks and PDAs
Threshold Detectors/Discriminators
Sensing at Ground or Supply Line
Telemetry and Remote Systems
Medical Instruments
Features
♦Space-Saving SC70 Package (Half the Size of
SOT23)
♦Ultra-Low Supply Current
350nA Per Comparator (MAX9119/MAX9120)
600nA Per Comparator with Reference
(MAX9117/MAX9118)
♦Guaranteed to Operate Down to +1.6V
♦Internal 1.252V ±1.75% Reference
(MAX9117/MAX9118)
♦Input Voltage Range Extends 200mV
Beyond-the-Rails
♦CMOS Push-Pull Output with ±5mA Drive
Capability (MAX9117/MAX9119)
♦Open-Drain Output Versions Available
(MAX9118/MAX9120)
♦Crowbar-Current-Free Switching
♦Internal Hysteresis for Clean Switching
♦No Phase Reversal for Overdriven Inputs
MAX9117–MAX9120
SC70, 1.6V, Nanopower, Beyond-the-Rails
Comparators With/Without Reference
________________________________________________________________ Maxim Integrated Products 1
VEE
IN- (REF)
IN+
15VCC
OUT
MAX9117
MAX9118
MAX9119
MAX9120
SC70
TOP VIEW
2
34
( ) ARE FOR MAX9117/MAX9118.
IN- (REF)
N.C.
VEE
18N.C.
N.C.
MAX9117
MAX9120
SO
2
IN+ 3
VCC
7
OUT
6
45
Typical Application Circuit appears at end of data sheet.
Pin Configurations
Selector Guide
Ordering Information
Beyond-the-Rails is a trademark of Maxim Integrated Products, Inc.
19-1862; Rev 4; 1/07
PART INTERNAL
REFERENCE
OUTPUT
TYPE
SUPPLY
CURRENT
(nA)
MAX9117 Yes Push-Pull 600
MAX9118 Yes Open-Drain 600
350Push-PullNoMAX9119
MAX9120 No Open-Drain 350
PART PIN-
PACKAGE
TOP
MARK
PKG
CODE
MAX9117EXK-T 5 SC70-5 ABW X5-1
MAX9117ESA+ 8 SO —S8-2
MAX9118EXK-T 5 SC70-5 ABX X5-1
MAX9119EXK-T 5 SC70-5 ABY X5-1
MAX9120EXK-T 5 SC70-5 ABZ X5-1
MAX9120ESA+ 8 SO —S8-2
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.
Note: All devices specified for over -40°C to +85°C operating
temperature range.
+Denotes lead-free package.
MAX9117–MAX9120
SC70, 1.6V, Nanopower, Beyond-the-Rails
Comparators With/Without Reference
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS—MAX9117/MAX9118 (with REF)
(VCC = +5V, VEE = 0V, VIN+ = VREF, TA= -40°C to +85°C, unless otherwise noted. Typical values are at TA= +25°C.) (Note 1)
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.
Supply Voltage (VCC to VEE)..................................................+6V
Voltage Inputs (IN+, IN-, REF) .........(VEE - 0.3V) to (VCC + 0.3V)
Output Voltage
MAX9117/MAX9119 ....................(VEE - 0.3V) to (VCC + 0.3V)
MAX9118/MAX9120 ..................................(VEE - 0.3V) to +6V
Current Into Input Pins......................................................±20mA
Output Current..................................................................±50mA
Output Short-Circuit Duration .................................................10s
Continuous Power Dissipation (TA= +70°C)
5-Pin SC70 (derate 2.5mW/°C above +70°C).............200mW
8-Pin SO (derate 5.88mW/°C above +70°C)...............471mW
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature......................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
TA = +25°C 1.6 5.5
Supply Voltage Range VCC Inferred from the PSRR
test TA = TMIN to TMAX 1.8 5.5
V
VCC = 1.6V TA = +25°C
0.60
1
TA = +25°C
0.68
1.3
Supply Current ICC VCC = 5V TA = TMIN to TMAX 1.6
µA
IN+ Voltage Range VIN+ Inferred from output swing test VEE -
0.2
VCC +
0.2 V
TA = +25°C 1 5
Input Offset Voltage VOS (Note 2) TA = TMIN to TMAX 10
mV
Input-Referred Hysteresis VHB (Note 3) 4
mV
TA = +25°C
0.15
1
Input Bias Current IBTA = TMIN to TMAX 2
nA
VCC = 1.6V to 5.5V, TA = +25°C 0.1 1
Power-Supply Rejection Ratio PSRR
VCC = 1.8V to 5.5V, TA = TMIN to TMAX 1
mV/V
TA = +25°C
190
400
MAX9117, VCC = 5V,
ISOURCE
= 5mA TA = TMIN to TMAX 500
VCC = 1.6V, TA = +25°C 100
200
Output Voltage Swing High
VCC - VOH
MAX9117,
ISOURCE
= 1mA VCC = 1.8V,
TA = TMIN to TMAX 300
mV
TA = +25°C
190
400
VCC = 5V, ISINK
= 5mA TA = TMIN to TMAX 500
VCC = 1.6V, TA = +25°C 100
200
Output Voltage Swing Low VOL
ISINK
= 1mA VCC = 1.8V,
TA = TMIN to TMAX 300
mV
Output Leakage Current ILEAK MAX9118 only, VO = 5.5V
0.002
1
µA
VCC = 5V 35
Sourcing, VO = VEE VCC = 1.6V 3
VCC = 5V 35
Output Short-Circuit Current ISC
Sinking, VO = VCC VCC = 1.6V 3
mA
VCC = 1.6V 16
High-to-Low Propagation Delay
(Note 4) tPD-VCC = 5V 14 µs
MAX9117–MAX9120
SC70, 1.6V, Nanopower, Beyond-the-Rails
Comparators With/Without Reference
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS—MAX9119/MAX9120 (without REF)
(VCC = +5V, VEE = 0V, VCM = 0V, TA= -40°C to +85°C, unless otherwise noted. Typical values are at TA= +25°C.) (Note 1)
ELECTRICAL CHARACTERISTICS—MAX9117/MAX9118 (with REF) (continued)
(VCC = +5V, VEE = 0V, VIN+ = VREF, TA= -40°C to +85°C, unless otherwise noted. Typical values are at TA= +25°C.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
VCC = 1.6V 15
MAX9117 only VCC = 5V 40
VCC = 1.6V, RPULLUP
= 100kΩ16
Low-to-High Propagation Delay
(Note 4) tPD+
MAX9118 only
VCC = 5V,
RPULLUP = 100kΩ45
µs
Rise Time tRISE MAX9117 only, CL = 15pF 1.6 µs
Fall Time tFALL CL = 15pF 0.2 µs
Power-Up Time tON 1.2
TA = +25°C
1.230 1.252 1.274
Reference Voltage VREF TA = TMIN to TMAX
1.196 1.308
V
Reference Voltage Temperature
Coefficient
TCREF 100
°C
BW = 10Hz to 100kHz 1.1
Reference Output Voltage Noise ENBW = 10Hz to 100kHz, CREF = 1nF 0.2
Reference Line Regulation
∆VREF/
∆VCC VCC = 1.6V to 5.5V
0.25
Reference Load Regulation
∆VREF/
∆IOUT ∆IOUT = 10nA ±1
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
TA = +25°C 1.6 5.5
Supply Voltage Range VCC Inferred from the
PSRR test TA = TMIN to TMAX 1.8 5.5 V
VCC = 1.6V, TA = +25°C 0.35 0.80
TA = +25°C 0.45 0.80
Supply Current ICC VCC = 5V TA = TMIN to TMAX 1.2
µA
Input Common-Mode
Voltage Range VCM Inferred from the CMRR test VEE -
0.2
VCC +
0.2 V
TA = +25°C15
Input Offset Voltage VOS
-0.2V ≤ VCM ≤
(VCC + 0.2V)
(Note 2) TA = TMIN to TMAX 10
mV
Input-Referred Hysteresis VHB -0.2V ≤ VCM ≤ (VCC + 0.2V) (Note 3) 4 mV
TA = +25°C 0.15 1
Input Bias Current IBTA = TMIN to TMAX 2nA
Input Offset Current IOS 75 pA
VCC = 1.6V to 5.5V, TA = +25°C 0.1 1
Power-Supply Rejection Ratio PSRR
VCC = 1.8V to 5.5V, TA = TMIN to TMAX 1
mV/V
Common-Mode Rejection Ratio CMRR (VEE - 0.2V) ≤ VCM ≤ (VCC + 0.2V) 0.5 3 mV/V
MAX9117–MAX9120
SC70, 1.6V, Nanopower, Beyond-the-Rails
Comparators With/Without Reference
4 _______________________________________________________________________________________
ELECTRICAL CHARACTERISTICS—MAX9119/MAX9120 (without REF) (continued)
(VCC = +5V, VEE = 0V, VCM = 0V, TA= -40°C to +85°C, unless otherwise noted. Typical values are at TA= +25°C.) (Note 1)
Note 1: All specifications are 100% tested at TA= +25°C. Specification limits over temperature (TA= TMIN to TMAX) are guaranteed
by design, not production tested.
Note 2: VOS is defined as the center of the hysteresis band at the input.
Note 3: The hysteresis-related trip points are defined as the edges of the hysteresis band, measured with respect to the center of
the band (i.e., VOS) (Figure 2).
Note 4: Specified with an input overdrive (VOVERDRIVE) of 100mV, and load capacitance of CL= 15pF. VOVERDRIVE is defined
above and beyond the offset voltage and hysteresis of the comparator input. For the MAX9117/MAX9118, reference voltage
error should also be added.
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
TA = +25°C
190 400
MAX9119 only, VCC =
5V, ISOURCE = 5mA TA = TMIN to TMAX
500
VCC = 1.6V,
TA = +25°C
100 200
Output Voltage Swing High VCC -
VOH MAX9119 only,
ISOURCE = 1mA VCC = 1.8V,
TA = TMIN to TMAX
300
mV
TA = +25°C
190 400
VCC = 5V,
ISINK = 5mA TA = TMIN to TMAX
500
VCC = 1.6V,
TA = +25°C
100 200
Output Voltage Swing Low VOL
ISINK = 1mA
VCC = 1.8V,
TA = TMIN to TMAX
300
mV
Output Leakage Current ILEAK MAX9120 only, VO = 5.5V
0.001
1µA
VCC = 5V 35
Sourcing, VO = VEE VCC = 1.6V 3
VCC = 5V 35
Output Short-Circuit Current ISC
Sourcing, VO = VCC VCC = 1.6V 3
mA
VCC = 1.6V 16
High-to-Low Propagation Delay
(Note 4) tPD- VCC = 5V 14 µs
VCC = 1.6V 15
MAX9119 only VCC = 5V 40
VCC = 1.6V,
RPULLUP = 100kΩ16
Low-to-High Propagation Delay
(Note 4) tPD+
MAX9120 only
VCC = 5V,
RPULLUP = 100kΩ45
µs
Rise Time tRISE MAX9119 only, CL = 15pF 1.6 µs
Fall Time tFALL CL = 15pF 0.2 µs
Power-Up Time tON 1.2 ms
500
600
550
650
700
750
800
900
850
950
1.5 2.52.0 3.0 3.5 4.0 4.5 5.0 5.5
MAX9117/MAX9118 SUPPLY CURRENT
vs. SUPPLY VOLTAGE AND TEMPERATURE
MAX9117-20 toc01
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (nA)
TA = +85°C
TA = +25°C
TA = -40°C
250
300
350
400
450
500
550
1.5 2.52.0 3.0 3.5 4.0 4.5 5.0 5.5
MAX9119/MAX9120 SUPPLY CURRENT
vs. SUPPLY VOLTAGE AND TEMPERATURE
MAX9117-20 toc02
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (nA)
TA = +85°C
TA = +25°C
TA = -40°C
550
650
600
750
700
850
800
900
-40 10-15 356085
MAX9117/MAX9118
SUPPLY CURRENT vs. TEMPERATURE
MAX9117-20 toc03
TEMPERATURE (°C)
SUPPLY CURRENT (nA)
VCC = +3V
VCC = +5V
VCC = +1.8V
250
350
300
450
400
500
550
-40 10-15 35 60 85
MAX9119/MAX9120
SUPPLY CURRENT vs. TEMPERATURE
MAX9117-20 toc04
TEMPERATURE (°C)
SUPPLY CURRENT (nA)
VCC = +3V
VCC = +5V
VCC = +1.8V
0
300
200
100
400
500
600
700
0231 456 910
OUTPUT VOLTAGE LOW
vs. SINK CURRENT
MAX9117-20 toc07
SINK CURRENT (mA)
VOL (mV)
78
VCC = +1.8V
VCC = +5V
VCC = +3V
35
0
1 10 100 1k 10k 100k
MAX9117/MAX9118 SUPPLY CURRENT
vs. OUTPUT TRANSITION FREQUENCY
10
MAX9117-20 toc05
OUTPUT TRANSITION FREQUENCY (Hz)
SUPPLY CURRENT (µA)
25
30
5
15
20
VCC = +1.8V
VCC = +5V
VCC = +3V
35
0
1 10 100 1k 10k 100k
MAX9119/MAX9120 SUPPLY CURRENT
vs. OUTPUT TRANSITION FREQUENCY
10
MAX9117-20 toc06
OUTPUT TRANSITION FREQUENCY (Hz)
SUPPLY CURRENT (µA)
25
30
5
15
20
VCC = +1.8V
VCC = +5V
VCC = +3V
0
100
200
300
400
500
600
0246810
OUTPUT VOLTAGE LOW vs. SINK CURRENT
AND TEMPERATURE
MAX9117-20 toc08
SINK CURRENT (mA)
VOL (mV)
31579
TA = +85°C
TA = +25°C
TA = -40°C
0
0.2
0.1
0.4
0.3
0.6
0.5
0.7
042681537910
MAX9117/MAX9119 OUTPUT VOLTAGE
HIGH vs. SOURCE CURRENT
MAX9117-20 toc09
SOURCE CURRENT (mA)
VCC - VOH (V)
VCC = +1.8V
VCC = +5V
VCC = +3V
MAX9117–MAX9120
SC70, 1.6V, Nanopower, Beyond-the-Rails
Comparators With/Without Reference
_______________________________________________________________________________________ 5
Typical Operating Characteristics
(VCC = +5V, VEE = 0V, CL= 15pF, VOVERDRIVE = 100mV, TA= +25°C, unless otherwise noted.)
Typical Operating Characteristics (continued)
(VCC = +5V, VEE = 0V, CL= 15pF, VOVERDRIVE = 100mV, TA= +25°C, unless otherwise noted.)
MAX9117–MAX9120
SC70, 1.6V, Nanopower, Beyond-the-Rails
Comparators With/Without Reference
6 _______________________________________________________________________________________
0
0.2
0.1
0.4
0.3
0.6
0.5
042681537910
MAX9117/MAX9119 OUTPUT VOLTAGE
HIGH vs. SOURCE CURRENT AND TEMPERATURE
MAX9117-20 toc10
SOURCE CURRENT (mA)
VCC - VOH (V)
TA = +85°C
TA = +25°C
TA = -40°C
0
5
10
15
20
25
30
35
40
-40 -15 10 35 60 85
SHORT-CIRCUIT SINK CURRENT
vs. TEMPERATURE
MAX9117-20 toc11
TEMPERATURE (°C)
SINK CURRENT (mA)
VCC = +1.8V
VCC = +5V
VCC = +3V
0
5
10
15
20
25
30
35
40
-40 -15 10 35 60 85
MAX9117/MAX9119 SHORT-CIRCUIT SOURCE
CURRENT vs. TEMPERATURE
MAX9117-20 toc12
TEMPERATURE (°C)
SOURCE CURRENT (mA)
VCC = +1.8V
VCC = +3V
VCC = +5V
45
50
0.2
0.5
0.4
0.3
0.6
0.7
0.8
0.9
1.0
1.1
1.2
-40 10-15 356085
MAX9117-20 toc13
TEMPERATURE (°C)
VOS (mV)
VCC = +3V
VCC = +5V
VCC = +1.8V
OFFSET VOLTAGE vs. TEMPERATURE
3.0
4.0
3.5
5.5
5.0
4.5
6.0
-40 10-15 35 60 85
HYSTERESIS VOLTAGE vs. TEMPERATURE
MAX9117-20 toc14
TEMPERATURE (°C)
VHB (mV)
1.240
1.244
1.242
1.248
1.246
1.250
1.252
1.254
1.256
1.258
1.260
-40 10-15 356085
MAX9117/MAX9118
REFERENCE VOLTAGE vs. TEMPERATURE
MAX9117-20 toc15
TEMPERATURE (°C)
REFERENCE VOLTAGE (V)
VCC = +3V
VCC = +5V
VCC = +1.8V
1.249
1.250
1.251
1.252
1.253
1.254
1.5 2.5 3.5 4.52.0 3.0 4.0 5.0 5.5
MAX9117/MAX9118
REFERENCE VOLTAGE vs. SUPPLY VOLTAGE
MAX9117-20 toc16
SUPPLY VOLTAGE (V)
REFERENCE VOLTAGE (V)
1.240
1.242
1.244
1.246
1.248
1.250
1.252
1.254
1.256
1.258
1.260
045231 678910
MAX9117/MAX9118
REFERENCE OUTPUT VOLTAGE
vs. REFERENCE SOURCE CURRENT
MAX9117-20 toc17
SOURCE CURRENT (nA)
REFERENCE VOLTAGE (V)
VCC = +5V
VCC = +1.8V, +3V
1.240
1.242
1.244
1.246
1.248
1.250
1.252
1.254
1.256
1.258
1.260
045231 678910
MAX9117/MAX9118
REFERENCE OUTPUT VOLTAGE
vs. REFERENCE SINK CURRENT
MAX9117-20 toc18
SINK CURRENT (nA)
REFERENCE VOLTAGE (V)
VCC = +3V
VCC = +5V
VCC = +1.8V
Typical Operating Characteristics (continued)
(VCC = +5V, VEE = 0V, CL= 15pF, VOVERDRIVE = 100mV, TA= +25°C, unless otherwise noted.)
MAX9117–MAX9120
SC70, 1.6V, Nanopower, Beyond-the-Rails
Comparators With/Without Reference
_______________________________________________________________________________________ 7
10
30
20
50
40
70
60
80
02010 30 40 50
MAX9117-20 toc23
INPUT OVERDRIVE (mV)
tPD- (µs)
PROPAGATION DELAY (tPD-)
vs. INPUT OVERDRIVE
VCC = +3V
VCC = +5V
VCC = +1.8V
0
5
10
15
20
25
30
35
40
0 1020304050
MAX9117-20 toc24
INPUT OVERDRIVE (mV)
tPD+ (µs)
VCC = +5V
VCC = +3V
VCC = +1.8V
MAX9117/MAX9119
PROPAGATION DELAY (tPD+)
vs. INPUT OVERDRIVE
10 100 1000 10,000
MAX9118/MAX9120
PROPAGATION DELAY (tPD-)
vs. PULLUP RESISTANCE
MAX9117-20 toc25
RPULLUP (kΩ)
tPD- (µs)
15
9
10
11
12
13
14
VCC = +5V
VCC = +1.8V
VCC = +3V
10 100 1000 10,000
MAX9118/MAX9120
PROPAGATION DELAY (tPD+)
vs. PULLUP RESISTANCE
MAX9117-20 toc26
RPULLUP (kΩ)
tPD+ (µs)
100
0
20
40
60
80
VCC = +5V
VCC = +1.8V
VCC = +3V
IN+
(50mV/div)
OUT
(2V/div)
PROPAGATION DELAY (tPD-)
(VCC = +5V)
20µs/div
MAX9117-20 toc27
OV
OV
8
14
12
10
16
18
20
22
24
26
28
MAX9117-20 toc19
TEMPERATURE (°C)
tPD- (µs)
PROPAGATION DELAY (tPD-)
vs. TEMPERATURE
-40 10-15 356085
VCC = +1.8V
VCC = +3V
VCC = +5V
0
20
10
40
30
50
60
MAX9117-20 toc20
tPD+ (µs)
MAX9117/MAX9119
PROPAGATION DELAY (tPD+)
vs. TEMPERATURE
-40 10-15 35 60 85
TEMPERATURE (°C)
VCC = +5V
VCC = +1.8V
VCC = +3V
200
0
0.01 0.1 1 10 100 1000
40
MAX9117-20 toc21
CAPACITIVE LOAD (nF)
tPD- (µs)
80
120
160
20
60
100
140
180
PROPAGATION DELAY (tPD-)
vs. CAPACITIVE LOAD
VCC = +5V
VCC = +1.8V
VCC = +3V
0.01 0.1 1 10 100 1000
MAX9117-20 toc22
CAPACITIVE LOAD (nF)
tPD+ (µs)
MAX9117/MAX9119
PROPAGATION DELAY (tPD+)
vs. CAPACITIVE LOAD
0
40
20
100
80
60
140
160
120
180
VCC = +5V
VCC = +1.8V
VCC = +3V
Typical Operating Characteristics (continued)
(VCC = +5V, VEE = 0V, CL= 15pF, VOVERDRIVE = 100mV, TA= +25°C, unless otherwise noted.)
MAX9117–MAX9120
SC70, 1.6V, Nanopower, Beyond-the-Rails
Comparators With/Without Reference
8 _______________________________________________________________________________________
IN+
(50mV/div)
OUT
(1V/div)
MAX9117/MAX9119
PROPAGATION DELAY (tPD+)
(VCC = +1.8V)
20µs/div
MAX9117-20 toc32
OV
OV
IN+
(50mV/div)
OUT
(1V/div)
MAX9117/MAX9119
10kHz RESPONSE (VCC = +1.8V)
20µs/div
MAX9117-20 toc33
OV
OV
IN+
(50mV/div)
OUT
(2V/div)
MAX9117/MAX9119
1kHz RESPONSE (VCC = +5V)
200µs/div
MAX9117-20 toc34
OV
OV
VCC
(2V/div)
OUT
(2V/div)
POWER-UP/DOWN RESPONSE
40µs/div
MAX9117-20 toc35
OV
OV
IN+
(50mV/div)
OUT
(2V/div)
PROPAGATION DELAY (tPD-)
(VCC = +3V)
20µs/div
MAX9117-20 toc29
OV
OV
IN+
(50mV/div)
OUT
(2V/div)
MAX9117/MAX9119
PROPAGATION DELAY (tPD+)
(VCC = +3V)
20µs/div
MAX9117-20 toc30
OV
OV
IN+
(50mV/div)
OUT
(1V/div)
PROPAGATION DELAY (tPD-)
(VCC = +1.8V)
20µs/div
MAX9117-20 toc31
OV
OV
IN+
(50mV/div)
OUT
(2V/div)
MAX9117/MAX9119
PROPAGATION DELAY (tPD+)
(VCC = +5V)
20µs/div
MAX9117-20 toc28
OV
OV
MAX9117–MAX9120
SC70, 1.6V, Nanopower, Beyond-the-Rails
Comparators With/Without Reference
_______________________________________________________________________________________ 9
Functional Diagrams
MAX9117
MAX9118
IN+
OUT
VCC
VEE
REF
REF
1.252V
MAX9119
MAX9120
IN+
OUT
VCC
VEE
IN-
Detailed Description
The MAX9117/MAX9118 feature an on-board 1.252V
±1.75% reference, yet draw an ultra-low supply current
of 600nA. The MAX9119/MAX9120 (without reference)
consume just 350nA of supply current. All four devices
are guaranteed to operate down to +1.6V. Their com-
mon-mode input voltage range extends 200mV
beyond-the-rails. Internal hysteresis ensures clean out-
put switching, even with slow-moving input signals.
Large internal output drivers allow rail-to-rail output
swing with up to ±5mA loads.
The output stage employs a unique design that mini-
mizes supply-current surges while switching, virtually
eliminating the supply glitches typical of many other
comparators. The MAX9117/MAX9119 have a push-pull
output stage that sinks as well as sources current. The
MAX9118/MAX9120 have an open-drain output stage
that can be pulled beyond VCC to an absolute maxi-
mum of 6V above VEE. These open-drain versions are
ideal for implementing wire-OR output logic functions.
Input Stage Circuitry
The input common-mode voltage range extends from
VEE - 0.2V to VCC + 0.2V. These comparators operate
at any differential input voltage within these limits. Input
bias current is typically ±0.15nA if the input voltage is
between the supply rails. Comparator inputs are pro-
tected from overvoltage by internal ESD protection
diodes connected to the supply rails. As the input volt-
age exceeds the supply rails, these ESD protection
diodes become forward biased and begin to conduct.
Output Stage Circuitry
The MAX9117–MAX9120 contain a unique break-
before-make output stage capable of rail-to-rail opera-
tion with up to ±5mA loads. Many comparators
consume orders of magnitude more current during
switching than during steady-state operation. However,
with this family of comparators, the supply-current
change during an output transition is extremely small.
In the Typical Operating Characteristics, the Supply
Current vs. Output Transition Frequency graphs show
the minimal supply-current increase as the output
switching frequency approaches 1kHz. This character-
istic reduces the need for power-supply filter capaci-
tors to reduce glitches created by comparator
switching currents. In battery-powered applications,
this characteristic results in a substantial increase in
battery life.
PIN
M A X9117/
M A X9118
M A X91 19/
M A X91 20
SC70
SO SC 70 SO
NAME
FUNCTION
1616OUT Comparator Output
2424V
EE Negative Supply
3 3 3 3 IN+ Comparator
Noninverting Input
42
—
REF 1.252V Reference
5757V
CC Positive Supply
——4 2 IN- Comparator Inverting
Input
—
1, 5,
8
—1, 5,
8
N.C.
No Connection.
Not internally
connected.
Pin Description
MAX9117–MAX9120
SC70, 1.6V, Nanopower, Beyond-the-Rails
Comparators With/Without Reference
10 ______________________________________________________________________________________
Reference (MAX9117/MAX9118)
The internal reference in the MAX9117/MAX9118 has an
output voltage of +1.252V with respect to VEE. Its typical
temperature coefficient is 100ppm/°C over the full
-40°C to +85°C temperature range. The reference is a
PNP emitter-follower driven by a 120nA current source
(Figure 1). The output impedance of the voltage refer-
ence is typically 200kΩ, preventing the reference from
driving large loads. The reference can be bypassed with
a low-leakage capacitor. The reference is stable for any
capacitive load. For applications requiring a lower output
impedance, buffer the reference with a low-input-leak-
age op amp, such as the MAX4162.
Applications Information
Low-Voltage, Low-Power Operation
The MAX9117–MAX9120 are ideally suited for use with
most battery-powered systems. Table 1 lists a variety of
battery types, capacities, and approximate operating
times for the MAX9117–MAX9120, assuming nominal
conditions.
Internal Hysteresis
Many comparators oscillate in the linear region of oper-
ation because of noise or undesired parasitic feed-
back. This tends to occur when the voltage on one
input is equal or very close to the voltage on the other
input. The MAX9117–MAX9120 have internal hysteresis
to counter parasitic effects and noise.
The hysteresis in a comparator creates two trip points:
one for the rising input voltage (VTHR) and one for the
falling input voltage (VTHF) (Figure 2). The difference
between the trip points is the hysteresis (VHB). When
the comparator’s input voltages are equal, the hystere-
sis effectively causes one comparator input to move
quickly past the other, thus taking the input out of the
region where oscillation occurs. Figure 2 illustrates the
case in which IN- has a fixed voltage applied, and IN+
is varied. If the inputs were reversed, the figure would
be the same, except with an inverted output.
Additional Hysteresis (MAX9117/MAX9119)
The MAX9117/MAX9119 have a 4mV internal hysteresis
band (VHB). Additional hysteresis can be generated
with three resistors using positive feedback (Figure 3).
Unfortunately, this method also slows hysteresis re-
sponse time. Use the following procedure to calculate
resistor values.
1) Select R3. Leakage current at IN is under 2nA, so the
current through R3 should be at least 0.2µA to mini-
mize errors caused by leakage current. The current
through R3 at the trip point is (VREF - VOUT) / R3.
Considering the two possible output states in solving
for R3 yields two formulas: R3 = VREF / IR3 or R3 =
(VCC - VREF) / IR3. Use the smaller of the two result-
ing resistor values. For example, when using the
120nA
REF
VCC
VEE
VBIAS
Figure 1. MAX9117/MAX9118 Voltage Reference Output
Equivalent Circuit
Table 1. Battery Applications Using MAX9117–MAX9120
BATTERY
TYPE RECHARGEABLE VFRESH
(V)
VEND-OF-LIFE
(V)
CAPACITY,
AA SIZE
(mA-h)
MAX9117/MAX9118
OPERATING TIME
(hr)
Alkaline
(2 Cells) No 3.0 1.8 2000 2.5 x 106
Nickel-Cadmium
(2 Cells) Yes 2.4 1.8 750 937,500
1.25 x 106
10002.73.5Yes
Lithium-Ion
(1 Cell)
Nickel-Metal-
Hydride
(2 Cells)
Yes 2.4 1.8 1000 1.25 x 106
MAX9119/MAX9120
OPERATING TIME
(hr)
5 x 106
1.875 x 106
2.5 x 106
2.5 x 106
MAX9117–MAX9120
SC70, 1.6V, Nanopower, Beyond-the-Rails
Comparators With/Without Reference
______________________________________________________________________________________ 11
THRESHOLDS
OUT
IN+
IN-
VHB
HYSTERESIS
BAND
VTHF
VTHR
Figure 2. Threshold Hysteresis Band
VCC
MAX9117
MAX9119
OUT
R3
R1
R2
VREF
VEE
VIN
VCC
Figure 3. MAX9117/MAX9119 Additional Hysteresis
MAX9117 (VREF = 1.252V) and VCC = +5V, and if
we choose IR3 = 1µA, then the two resistor values
are 1.2MΩand 3.8MΩ. Choose a 1.2MΩstandard
value for R3.
2) Choose the hysteresis band required (VHB). For this
example, choose 50mV.
3) Calculate R1 according to the following equation:
R1 = R3 (VHB / VCC)
For this example, insert the values:
R1 = 1.2MΩ(50mV / 5V) = 12kΩ
4) Choose the trip point for VIN rising (VTHR) such that
VTHR > VREF ✕(R1 + R3) / R3, (VTHR is the trip point
for VIN rising). This is the threshold voltage at which
the comparator switches its output from low to high
as VIN rises above the trip point. For this example,
choose 3V.
5) Calculate R2 as follows:
R2 = 1 / [VTHR / (VREF ✕R1) - (1 / R1) - (1 / R3)]
R2 = 1 / [3.0V / (1.252V ✕12kΩ) - (1 / 12kΩ) -
(1 / 1.2MΩ)] = 8.655kΩ
For this example, choose an 8.66kΩstandard 1% value.
6) Verify the trip voltages and hysteresis as follows:
VIN rising: VTHR = VREF ✕R1 [(1 / R1) + (1 / R2)
+ (1 / R3)] = 3V
VIN falling: VTHF = VTHR - (R1 ✕VCC / R3) = 2.95V
Hysteresis = VTHR - VTHF = 50mV
Additional Hysteresis (MAX9118/MAX9120)
The MAX9118/MAX9120 have a 4mV internal hysteresis
band. They have open-drain outputs and require an
external pullup resistor (Figure 4). Additional hysteresis
can be generated using positive feedback, but the for-
mulas differ slightly from those of the MAX9117/
MAX9119. Use the following procedure to calculate
resistor values.
1) Select R3 according to the formulas R3 = VREF / 1µA
or R3 = (VCC - VREF) / 1µA - R4. Use the smaller of
the two resulting resistor values.
2) Choose the hysteresis band required (VHB).
3) Calculate R1 according to the following equation:
R1 = (R3 + R4) (VHB / VCC)
4) Choose the trip point for VIN rising (VTHR) (VTHR is
the trip point for VIN rising). This is the threshold volt-
age at which the comparator switches its output
from low to high as VIN rises above the trip point.
5) Calculate R2 as follows:
6) Verify the trip voltages and hysteresis as follows:
Hysteresis = VTHR - VTHF
V falling
VVR
RR RR
R
RR
V
IN
THF REF CC
:
=× ++
+
⎛
⎝
⎜⎞
⎠
⎟+×
−11
1
1
2
1
34
1
34
Vri g V V R RR R
IN THR REF
sin : =× ++
⎛
⎝
⎜⎞
⎠
⎟
11
1
1
2
1
3
RV
VRRR
THR
REF
21 1
1
1
1
3
=×
⎛
⎝
⎜⎞
⎠
⎟
⎡
⎣
⎢
⎢
⎤
⎦
⎥
⎥
−− /
MAX9117–MAX9120
SC70, 1.6V, Nanopower, Beyond-the-Rails
Comparators With/Without Reference
12 ______________________________________________________________________________________
Board Layout and Bypassing
Power-supply bypass capacitors are not typically
needed, but use 100nF bypass capacitors close to the
device’s supply pins when supply impedance is high,
supply leads are long, or excessive noise is expected
on the supply lines. Minimize signal trace lengths to
reduce stray capacitance. A ground plane and sur-
face-mount components are recommended. If the REF
pin is decoupled, use a new low-leakage capacitor.
Zero-Crossing Detector
Figure 5 shows a zero-crossing detector application.
The MAX9119’s inverting input is connected to ground,
and its noninverting input is connected to a 100mVP-P
signal source. As the signal at the noninverting input
crosses 0V, the comparator’s output changes state.
Logic-Level Translator
The Typical Application Circuit shows an application
that converts 5V logic to 3V logic levels. The MAX9120
is powered by the +5V supply voltage, and the pullup
resistor for the MAX9120’s open-drain output is con-
nected to the +3V supply voltage. This configuration
allows the full 5V logic swing without creating overvolt-
age on the 3V logic inputs. For 3V to 5V logic-level
translations, simply connect the +3V supply voltage to
VCC and the +5V supply voltage to the pullup resistor.
Chip Information
TRANSISTOR COUNT: 98
MAX9120
IN-
2MΩ
2MΩ
RPULLUP
3V (5V)
LOGIC OUT
OUT
VCC
+5V (+3V)
+3V (+5V)
VEE
5V (3V) LOGIC IN
IN+
LOGIC-LEVEL
TRANSLATOR
Typical Application Circuit
VEE
VCC OUT
R3
R2
R1 R4
VREF
VIN
VCC
MAX9118
MAX9120
Figure 4. MAX9118/MAX9120 Additional Hysteresis
MAX9119
IN+
OUT
VCC
100mVP-P
VCC
VEE
IN-
Figure 5. Zero-Crossing Detector
MAX9117–MAX9120
SC70, 1.6V, Nanopower, Beyond-the-Rails
Comparators With/Without Reference
______________________________________________________________________________________ 13
Package Information
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information
go to www.maxim-ic.com/packages.)
SC70, 5L.EPS
PACKAGE OUTLINE, 5L SC70
21-0076
1
1
E
MAX9117–MAX9120
SC70, 1.6V, Nanopower, Beyond-the-Rails
Comparators With/Without Reference
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are
implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
14 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600
© 2007 Maxim Integrated Products is a registered trademark of Maxim Integrated Products, Inc.
SOICN .EPS
PACKAGE OUTLINE, .150" SOIC
1
1
21-0041 B
REV.DOCUMENT CONTROL NO.APPROVAL
PROPRIETARY INFORMATION
TITLE:
TOP VIEW
FRONT VIEW
MAX
0.010
0.069
0.019
0.157
0.010
INCHES
0.150
0.007
E
C
DIM
0.014
0.004
B
A1
MIN
0.053A
0.19
3.80 4.00
0.25
MILLIMETERS
0.10
0.35
1.35
MIN
0.49
0.25
MAX
1.75
0.050
0.016L0.40 1.27
0.3940.386D
D
MINDIM
D
INCHES
MAX
9.80 10.00
MILLIMETERS
MIN MAX
16 AC
0.337 0.344 AB8.758.55 14
0.189 0.197 AA5.004.80 8
N MS012
N
SIDE VIEW
H 0.2440.228 5.80 6.20
e 0.050 BSC 1.27 BSC
C
HE
eBA1
A
D
0∞-8∞
L
1
VARIATIONS:
Package Information (continued)
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information
go to www.maxim-ic.com/packages.)
Revision History
Pages changed at Rev 4: 1, 2, 9, 13