MAX9107/MAX9108/MAX9109
25ns, Dual/Quad/Single, Low-Power,
TTL Comparators
General Description
Features
The MAX9107/MAX9108/MAX9109 dual/quad/single,
high-speed, low-power voltage comparators are designed
for use in systems powered from a single +5V supply.
Their 25ns propagation delay (with 10mV input overdrive)
is achieved with a power consumption of only 1.75mW
per comparator. The wide input common-mode range
extends from 200mV below ground to within 1.5V of the
positive supply rail.
The MAX9107/MAX9108/MAX9109 outputs are TTLcompatible, requiring no external pullup circuitry. These
easy-to-use comparators incorporate internal hysteresis
to ensure clean output switching even when the devices
are driven by a slow-moving input signal.
The MAX9107/MAX9108/MAX9109 are higher-speed,
lower-power, lower-cost upgrades to industry-standard
comparators MAX907/MAX908/MAX909. The MAX9109
features an output latch but does not have complementary outputs.
●● 25ns Propagation Delay
●● 350µA (1.75mW) Supply Current Per Comparator
●● Single 4.5V to 5.5V Supply Operation
●● Wide Input Range Includes Ground
●● Low 500µV Offset Voltage
●● Internal Hysteresis Provides Clean Switching (2mV)
●● TTL-Compatible Outputs
●● Internal Latch (MAX9109 only)
●● Space-Saving Packages:
• 6-Pin SC70 (MAX9109)
• 8-Pin SOT23 (MAX9107)
• 14-Pin TSSOP (MAX9108)
Ordering Information
PART
PINPACKAGE
TOP
MARK
PKG
CODE
The dual MAX9107 is available in both 8-pin SO and
SOT23 packages. The quad MAX9108 is available
in 14-pin TSSOP and SO packages while the single
MAX9109 is available in an ultra-small 6-pin SC70 package, a space-saving 6-pin SOT23 package and an 8-pin
SO package.
MAX9107EKA+T
8 SOT23-8
AAIB
K8-5
MAX9107ESA+
8 SO
—
S8-2
MAX9108EUD+
14 TSSOP
—
U14-1
MAX9108ESD+
14 SO
—
S14-1
MAX9109EXT+T
6 SC70-6
AAU
X6S-1
Applications
MAX9109EUT+T
6 SOT23-6
AARU
U6-1
MAX9109ESA+
8 SO
—
S8-2
●● Battery Powered Systems ●● Threshold Detectors/
●● A/D Converters
Discriminators
●● Line Receivers
●● Sampling Circuits
●● Zero-Crossing Detectors
Note: All devices are specified over the -40°C to +85°C operating temperature range.
Pin Configurations
TOP VIEW
OUTA
INAINA+
GND
1
MAX9107
2
3
8 VCC OUTA 1
14 OUTD OUT 1
7 OUTB INA- 2
13 IND-
6 INB5 INB+
4
SOT23/SO
INA+ 3
VCC 4
INB+ 5
INB- 6
A
D
MAX9108
B
C
OUTB 7
10 INC+
1
IN+
2
7 OUT
IN-
3
6 GND
N.C.
4
5 LE
GND 2
5 LE
IN+ 3
4 IN-
9 INC-
SC70/SOT23
8 N.C.
6 VCC VCC
11 GND
8 OUTC
TSSOP/SO
19-2045; Rev 3; 3/18
12 IND+
MAX9109
MAX9109
SO
MAX9107/MAX9108/MAX9109
25ns, Dual/Quad/Single, Low-Power,
TTL Comparators
Absolute Maximum Ratings
Power-Supply Ranges
Supply Voltage (VCC to GND)..............................................6V
Differential Input Voltage....................... -0.3V to (VCC + 0.3V)
Common-Mode Input Voltage to GND.. -0.3V to (VCC + 0.3V)
Latch-Enable Input Voltage
(MAX9109 only)................................. -0.3V to (VCC + 0.3V)
Current into Input Pins......................................................±20mA
Output Short-Circuit Duration to VCC or GND....................... 10s
Continuous Power Dissipation (TA = +70°C)
6-Pin SC70 (derate 3.1mW/°C above +70°C)..............245mW
6-Pin SOT23 (derate 8.7mW/°C above +70°C)...........696mW
8-Pin SOT23 (derate 9.1mW/°C above +70°C)...............727mW
8-Pin SO (derate 5.9mW/°C above +70°C)..................470mW
14-Pin TSSOP (derate 9.1mW/°C above +70°C).........727mW
14-Pin SO (derate 8.33mW/°C above +70°C)..............666mW
Operating Temperature Range............................ -40°C to +85°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
(VCC = +5V, VCM = 0, VLE = 0 (MAX9109 only), TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
Operating Voltage Range
VCC
Guaranteed by PSRR
Input Offset Voltage
VOS
(Note 2)
VHYST
(Note 3)
Input Hysteresis
Input Bias Current
MIN
TYP
4.5
TA = +25°C
0.5
TA = TMIN to TMAX
MAX
UNITS
5.5
V
1.6
4.0
2
mV
mV
IB
125
350
nA
Input Offset Current
IOS
25
80
nA
Input Voltage Range
VCMR
(Note 4)
Common-Mode Rejection Ratio
CMRR
VCC = 5.5V (Note 5)
50
1000
μV/V
Power-Supply Rejection Ratio
PSRR
4.5V ≤ VCC ≤ 5.5V
50
1000
μV/V
Output High Voltage
VOH
ISOURCE = 100μA
Output Low Voltage
VOL
Supply Current Per Comparator
ICC
-0.2
3.0
VCC - 1.5
3.5
ISINK = 3.2mA
0.35
ISINK = 8mA
0.4
VCC = +5.5V, all outputs low
0.35
V
V
0.6
0.7
V
mA
Output Rise Time
tr
VOUT = 0.4V to 2.4V, CL = 10pF
12
ns
Output Fall Time
tf
VOUT = 2.4V to 0.4V, CL = 10pF
6
ns
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Maxim Integrated │ 2
MAX9107/MAX9108/MAX9109
25ns, Dual/Quad/Single, Low-Power,
TTL Comparators
Electrical Characteristics (continued)
(VCC = +5V, VCM = 0, VLE = 0 (MAX9109 only), TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1)
PARAMETER
Propagation Delay
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
tPD+, tPD-
VIN = 100mV, VOD = 10mV
25
ns
ΔtPD
VIN = 100mV, VOD = 10mV
(Note 6)
1
ns
Propagation Delay Skew
tPDskew
VIN = 100mV, VOD = 10mV
(Note 7)
5
ns
Latch Input Voltage High
VIH
(Note 8)
Latch Input Voltage Low
VIL
(Note 8)
IIH, IIL
(Note 8)
0.4
Latch Setup Time
ts
(Note 8)
2
ns
Latch Hold Time
th
(Note 8)
2
ns
Differential Propagation Delay
Latch Input Current
2.0
V
0.8
V
1
µA
Note 1: Devices are 100% production tested at TA = +25°C. All temperature limits are guaranteed by design.
Note 2: Input Offset Voltage is defined as the center of the input-referred hysteresis zone. Specified for VCM = 0. See Figure 1.
Note 3: Trip Point is defined as the input voltage required to make the comparator output change state. The difference
between upper (VTRIP+) and lower (VTRIP-) trip points is equal to the width of the input-referred hysteresis zone (VHYST).
Specified for an input common-mode voltage (VCM) of 0. See Figure 1.
Note 4: Inferred from the CMRR test. Note that a correct logic result is obtained at the output, provided that at least one input is
within the VCMR limits. Note also that either or both inputs can be driven to the upper or lower absolute maximum limit
without damage to the part.
Note 5: Tested over the full-input voltage range (VCMR).
Note 6: Differential Propagation Delay is specified as the difference between any two channels in the MAX9107/MAX9108
(both outputs making either a low-to-high or a high-to-low transition).
Note 7: Propagation Delay Skew is specified as the difference between any single channel?s output low-to-high transition (tPD+)
and high-to-low transition (tPD-).
Note 8: Latch specifications apply to MAX9109 only. See Figure 2.
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Maxim Integrated │ 3
MAX9107/MAX9108/MAX9109
25ns, Dual/Quad/Single, Low-Power,
TTL Comparators
Typical Operating Characteristics
(VCC = 5V, VCM = 0, CL = 15pF, TA = +25°C, unless otherwise noted.)
0.2
TA = -55°C
4.0
4.5
5.0
5.5
4.5
5.0
5.5
0
-1
6.0
MAX9107/08/09 toc03
VCMR-60 -40 -20 0
20 40 60 80 100 120 140
TRIP POINT
vs. TEMPERATURE
-0.2
-0.3
-25
0
25
50
75
-100
-150
-200
-250
-300
100
VTRIP+
0
-1
-50
-25
0
25
50
75
-2
100
VTRIP-
-60 -40 -20 0
20 40 60 80 100 120 140
TEMPERATURE (°C)
TEMPERATURE (°C)
TEMPERATURE (°C)
OUTPUT LOW VOLTAGE
vs. SINK CURRENT
OUTPUT HIGH VOLTAGE
vs. SOURCE CURRENT
PROPAGATION DELAY
vs. INPUT OVERDRIVE
TA = -55°C
0.4
4.5
TA = +125°C
4.0
VOH (V)
TA = +25°C
0.3
TA = +125°C
3.5
3.0
TA = +25°C
0.2
TA = -55°C
2.5
4
6
ISINK (mA)
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8
10
12
2.0
1
10
100
ISOURCE (µA)
1000
35
PROPAGATION DELAY (ns)
5.0
MAX9107/08/09 toc07
0.5
2
VCM = 0
1
VOS (mV)
50
0
-50
-350
-400
2
MAX9107/08/09 toc05
INPUT CURRENT (nA)
0
-0.1
200
150
100
MAX9107/08/09 toc06
INPUT BIAS CURRENT
vs. TEMPERATURE
0.1
0
1
INPUT OFFSET VOLTAGE
vs. TEMPERATURE
0.2
0.1
2
TEMPERATURE (°C)
0.3
-50
4.0
3
SUPPLY VOLTAGE (V)
-0.4
VOL (V)
TA = -55°C
VCMR+
SUPPLY VOLTAGE (V)
0.4
INPUT OFFSET VOLTAGE (mV)
0
6.0
MAX9107/08/09 toc04
0.5
-0.5
0.2
0.1
0.1
0
TA = +25°C
4
RS = 10Ω
CLOAD = 15pF
30
tPD+
MAX9107/08/09 toc09
0.3
0.3
5
INPUT VOLTAGE RANGE (V)
TA = +25°C
TA = +125°C
MAX9107/08/09 toc08
SUPPLY CURRENT (mA)
0.4
0.4
INPUT VOLTAGE RANGE
vs. TEMPERATURE
MAX9107/08/09 toc02
TA = +125°C
0.5
SUPPLY CURRENT
vs. SUPPLY VOLTAGE
(OUTPUTS AT VOH)
0.5
SUPPLY CURRENT (mA)
0.6
MAX9107/08/09 toc01
SUPPLY CURRENT
vs. SUPPLY VOLTAGE
(OUTPUTS AT VOL)
25
20
tPD-
15
10
10
100
INPUT OVERDRIVE (mV)
Maxim Integrated │ 4
MAX9107/MAX9108/MAX9109
25ns, Dual/Quad/Single, Low-Power,
TTL Comparators
Typical Operating Characteristics (continued)
(VCC = 5V, VCM = 0, CL = 15pF, TA = +25°C, unless otherwise noted.)
PROPAGATION DELAY (tPD-)
INPUT
50mV/div
OVERDRIVE
10mV
MAX9107/08/09 toc11
MAX9107/08/09 toc10
PROPAGATION DELAY (tPD+)
INPUT
50mV/div
OVERDRIVE
10mV
OUTPUT
1V/div
OUTPUT
1V/div
SINUSOID 2MHz RESPONSE
PROPAGATION DELAY
vs. CAPACITIVE LOAD
OUTPUT
1V/div
PROPAGATION DELAY (ns)
INPUT
50mV/div
40
VOD = 10mV
RS = 10Ω
35
tPD+
30
25
20
50ns/div
MAX9107/08/09 toc13
5ns/div
MAX9107/08/09 toc12
10ns/div
tPD0
20
40
60
80
100
CAPACITIVE LOAD (pF)
30
tPD+
20
10
tPD-
-60 -40 -20 0
20 40 60 80 100 120 140
TEMPERATURE (°C)
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PROPAGATION DELAY
vs. SOURCE IMPEDANCE
100
MAX9107/08/09 toc15
VOD = 10mV
RS = 10Ω
CLOAD = 15pF
PROPAGATION DELAY (ns)
PROPAGATION DELAY (ns)
40
MAX9107/08/09 toc14
PROPAGATION DELAY
vs. TEMPERATURE
VOD = 5mV
CLOAD = 15pF
80
60
40
tPD+
20
0
10
100
1k
10k
SOURCE IMPEDANCE (Ω)
Maxim Integrated │ 5
MAX9107/MAX9108/MAX9109
25ns, Dual/Quad/Single, Low-Power,
TTL Comparators
Pin Description
PIN
MAX9107
MAX9108
1
MAX9109
NAME
FUNCTION
SC70/SOT23
SO
1
—
—
OUTA
2
2
—
—
INA-
Channel A Inverting Input
3
3
—
—
INA+
Channel A Noninverting Input
7
7
—
—
OUTB
Channel B Output
6
6
—
—
INB-
Channel B Inverting Input
5
5
—
—
INB+
Channel B Noninverting Input
—
8
—
—
OUTC
Channel C Output
—
9
—
—
INC-
Channel C Inverting Input
—
10
—
—
INC+
Channel C Noninverting Input
—
14
—
—
OUTD
Channel D Output
—
13
—
—
IND-
Channel D Inverting Input
—
12
—
—
IND+
Channel D Noninverting Input
—
—
1
7
OUT
Output
—
—
3
2
IN+
Noninverting Input
—
—
4
3
IN-
Inverting Input
8
4
6
1
VCC
Positive Supply
4
11
2
6
GND
Ground
—
—
5
5
LE
—
—
—
4, 8
N.C.
Detailed Description
Timing
Noise or undesired parasitic AC feedback cause most
high-speed comparators to oscillate in the linear region
(i.e., when the voltage on one input is at or near the
voltage on the other input). The MAX9107/MAX9108/
MAX9109 eliminate this problem by incorporating an
internal hysteresis of 2mV. When the two comparator
input voltages are equal, hysteresis effectively causes
one comparator input voltage to move quickly past
the other, thus taking the input out of the region where
oscillation occurs. Standard comparators require that
hysteresis be added through the use of external resistors. The MAX9107/MAX9108/MAX9109’s fixed internal
hysteresis eliminates these resistors. To increase hysteresis and noise margin even more, add positive feedback
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Channel A Output
Latch Enable. The latch is transparent when LE is low.
No Connection. Not internally connected.
with two resistors as a voltage divider from the output to
the noninverting input.
Adding hysteresis to a comparator creates two trip points:
one for the input voltage rising and one for the input
voltage falling (Figure 1). The difference between these
two input-referred trip points is the hysteresis. The
average of the trip points is the offset voltage.
Figure 1 illustrates the case where IN- is fixed and IN+ is
varied. If the inputs were reversed, the figure would look
the same, except the output would be inverted.
The MAX9109 includes an internal latch, allowing the
result of a comparison to be stored. If LE is low, the latch
is transparent (i.e., the comparator operates as though
the latch is not present). The state of the comparator
output is latched when LE is high (Figure 2).
Maxim Integrated │ 6
MAX9107/MAX9108/MAX9109
25ns, Dual/Quad/Single, Low-Power,
TTL Comparators
VTRIP+
VHYST
VTRIP-
VIN+
VOS =
LE
VTRIP+ + VTRIP-
1.4V
2
0
VIN- = 0
VOH
th
VOD
VOS
DIFFERENTIAL
INPUT
VOLTAGE
VIN
tPD+
OUTPUT 1.4V
VOL
Figure 1. Input and Output Waveforms, Noninverting Input
Varied
Applications Information
Circuit Layout
Because of the MAX9107/MAX9108/MAX9109’s high
gain bandwidth, special precautions must be taken to
realize the full high-speed capability. A printed circuit
board with a good, low-inductance ground plane is
mandatory. Place the decoupling capacitor (a 0.1µF
ceramic capacitor is a good choice) as close to VCC as
possible. Pay close attention to the decoupling capacitor’s
bandwidth, keeping leads short. Short lead lengths on the
inputs and outputs are also essential to avoid unwanted
parasitic feedback around the comparators. Solder the
device directly to the printed circuit board instead of using
a socket.
VOL
Figure 2. MAX9109 Timing Diagram
VCLAMP = -200mV TO -300mV
The inputs to the MAX9107/MAX9108/MAX9109 may be
driven beyond the voltage limits given in the Absolute
Maximum Ratings, as long as the current flowing into
the device is limited to 25mA. However, if the inputs are
overdriven, the output may be inverted. The addition of an
external diode prevents this inversion by limiting the input
voltage to 200mV to 300mV below ground (see Figure 3).
In Figure 4, the circuit allows reception of infrared data.
The MAX4400 converts the photodiode current to a
voltage, and the MAX9109 determines whether the
amplifier output is high enough to be called a “1.”
The current consumption of this circuit is minimal: the
MAX4400 and MAX9109 require typically 410µA and
350µA, respectively.
1/2 MAX9107
ISRC
V-
Figure 3. Schottky Clamp for Input Driven Below Ground
10pF
Overdriving the Inputs
Battery-Operated Infrared Data Link
COMPARE
ts
VOH
COMPARATOR
OUTPUT
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LATCH
3V
1MΩ
+5V
MAX4400
3
SIEMENS BP-104
PHOTODIODE 1
100kΩ
47kΩ
1000pF
+5V
0.1µF
5
4
3
1
2
100kΩ
0.1µF
6
4
2
+5V
5
DATA
MAX9109
1000pF
Figure 4. Battery-Operated Infrared Data Link Consumes Only
760μA
Maxim Integrated │ 7
MAX9107/MAX9108/MAX9109
Chip Information
MAX9107 TRANSISTOR COUNT: 262
MAX9108 TRANSISTOR COUNT: 536
MAX9109 TRANSISTOR COUNT: 140
PROCESS: Bipolar
www.maximintegrated.com
25ns, Dual/Quad/Single, Low-Power,
TTL Comparators
Package Information
For the latest package outline information and land patterns
(footprints), go to www.maximintegrated.com/packages. Note
that a “+”, “#”, or “-” in the package code indicates RoHS status
only. Package drawings may show a different suffix character, but
the drawing pertains to the package regardless of RoHS status.
PACKAGE
TYPE
PACKAGE
CODE
OUTLINE
NO.
LAND
PATTERN NO.
8 SOT23
K8-5
21-0041
90-0176
3 SC70
S8-2
21-0041
90-0096
8 SO
U14-1
21-0066
90-0113
14 SO
S14-1
21-0041
90-0112
6 SC70
X6SN-1
21-0077
90-0189
6 SOT23
U6-1
21-0058
90-0175
Maxim Integrated │ 8
MAX9107/MAX9108/MAX9109
25ns, Dual/Quad/Single, Low-Power,
TTL Comparators
Revision History
REVISION
NUMBER
REVISION
DATE
2
1/07
General Edits
3
3/18
Updated Ordering Information table
DESCRIPTION
PAGES
CHANGED
1, 2, 9–13
1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim Integrated’s website at www.maximintegrated.com.
Maxim Integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim Integrated product. No circuit patent licenses
are implied. Maxim Integrated reserves the right to change the circuitry and specifications without notice at any time. The parametric values (min and max limits)
shown in the Electrical Characteristics table are guaranteed. Other parametric values quoted in this data sheet are provided for guidance.
Maxim Integrated and the Maxim Integrated logo are trademarks of Maxim Integrated Products, Inc.
© 2018 Maxim Integrated Products, Inc. │ 9
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