EVALUATION KIT AVAILABLE
MAX9647/MAX9648
General-Purpose, Low-Voltage,
Tiny Pack Comparators
General Description
Features
The MAX9647/MAX9648 comparators are drop-in, pin-forpin compatible replacements for the LMX331/LMX331H.
The MAX9648 has the added benefit of internal hysteresis to provide noise immunity, preventing output oscillations even with slow moving input signals.
S Guaranteed +1.8V to +5.5V Performance
Advantages of the ICs include low supply voltage, small
package, and low cost. They also offer a wide supply
voltage range, wide operating temperature range, competitive CMRR and PSRR, response time characteristics,
input offset, low noise, output saturation voltage, input
bias current, and RF immunity.
S Input Common-Mode Voltage Range Includes
Ground
The ICs are available in both 5-pin SC70 and SOT23
packages.
Applications
S -40NC to +125NC Automotive Temperature Range
S Low Supply Current (60µA/Channel at
VDD = +5.0V)
S No Phase Reversal for Overdriven Inputs
S Low Output Saturation Voltage (120mV)
S Internal 2mV Hysteresis (MAX9648)
S 5-Pin SC70 Space-Saving Package
(2.0mm x 2.1mm x 1.0mm)
Mobile Communications
Notebooks and PDAs
Battery-Powered Electronics
Ordering Information appears at end of data sheet.
General-Purpose Portable Devices
General-Purpose Low-Voltage Applications
For pricing, delivery, and ordering information, please contact Maxim Direct
at 1-888-629-4642, or visit Maxim’s website at www.maximintegrated.com.
19-5968; Rev 3; 4/15
MAX9647/MAX9648
General-Purpose, Low-Voltage,
Tiny Pack Comparators
ABSOLUTE MAXIMUM RATINGS
Supply Voltage (VDD to VSS)...................................-0.3V to +6V
All Other Pins Except OUT............. (VSS - 0.3V) to (VDD + 0.3V)
Differential Input Voltage (IN+ to IN-)................................ ±3.6V
OUT................................................................ (VSS - 03V) to +6V
Continuous Power Dissipation (TA = +70NC)
SC70 (derate 3.1mW/NC above +70NC)........................247mW
SOT23 (derate 3.9mW/NC above +70NC)..................312.6mW
Operating Temperature Range......................... -40NC to +125NC
Junction Temperature......................................................+150NC
Storage Temperature Range............................. -65NC to +150NC
Lead Temperature (soldering, 10s).................................+300NC
Soldering Temperature (reflow).......................................+260NC
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.
PACKAGE THERMAL CHARACTERISTICS (Note 1)
SC70
Junction-to-Ambient Thermal Resistance (ΘJA).............324°C/W
Junction-to-Case Thermal Resistance (ΘJC)..................115°C/W
SOT23
Junction-to-Ambient Thermal Resistance (ΘJA)..........255.9°C/W
Junction-to-Case Thermal Resistance (ΘJC)....................81°C/W
Note 1: Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-layer
board. For detailed information on package thermal considerations, refer to www.maximintegrated.com/thermal-tutorial.
DC ELECTRICAL CHARACTERISTICS—2.7V OPERATION
(VDD = 2.7V, VSS = 0V, VCM = 0V, RL = 5.1kI connected to VDD, typical values are at TA = +25NC, unless otherwise noted. Boldface
limits apply at the defined temperature extremes.) (Note 2)
PARAMETER
Input Offset Voltage
SYMBOL
CONDITIONS
MIN
VOS
Input Voltage Hysteresis
VHYST
Input Offset Voltage Average
Temperature Drift
TCVOS
MAX9648 only
TA = +25NC
Input Bias Current
IB
IOS
MAX
UNITS
0.4
7
mV
2
mV
1.5
FV/NC
Q0.0003
±400
TA = -40NC to +125NC
±400
Q0.0003
TA = -40NC to +85NC
Voltage Gain
Output Saturation Voltage
AV
MAX9647 only
500
V/mV
ISINK P 1mA
25
mV
16
mA
IO
VO P 1.5V
Supply Current
IS
(Note 3)
5
100
FA
TA = -40NC to +85NC
1
FA
TA = -40NC to +125NC
2
TA = +25NC
Maxim Integrated
V
2.0
Output Sink Current
Output Leakage Current
nA
±150
-0.1
VCM
VSAT
nA
Q50
±150
TA = -40NC to +125NC
Input Voltage Range
Q250
TA = -40NC to +85NC
TA = +25NC
Input Offset Current
TYP
52
0.005
2
MAX9647/MAX9648
General-Purpose, Low-Voltage,
Tiny Pack Comparators
AC ELECTRICAL CHARACTERISTICS—2.7V OPERATION
(VDD = 2.7V, VSS = 0V, VCM = 0V, RL = 5.1kI connected to VDD, typical values are at TA = +25NC, unless otherwise noted. Boldface
limits apply at the defined temperature extremes.) (Note 2)
PARAMETER
SYMBOL
Propagation Delay Output
High to Low (Note 4)
tPHL
Propagation Delay Output
Low to High (Note 4)
tPLH
CONDITIONS
MIN
TYP
Input overdrive = 10mV
70
Input overdrive = 100mV
50
Input overdrive = 10mV
115
Input overdrive = 100mV
100
MAX
UNITS
ns
ns
DC ELECTRICAL CHARACTERISTICS–5.0V OPERATION
(VDD = 5V, VSS = 0V, VCM = 0V, RL = 5.1kI connected to VDD, typical values are at TA = +25NC, unless otherwise noted. Boldface
limits apply at the defined temperature extremes.) (Note 2)
PARAMETER
SYMBOL
CONDITIONS
MIN
TA = +25NC
Input Offset Voltage
Input Voltage Hysteresis
Input Offset Voltage Average
Temperature Drift
VOS
TA = -40NC to +125NC
9
TCVOS
IOS
Voltage Gain
1.5
FV/NC
±400
TA = -40NC to +125NC
±400
Q0.007
TA = -40NC to +85NC
VSAT
20
500
120
TA = -40NC to +85NC
IO
VO P 1.5V
TA = +25NC
Supply Current (Note 3)
IS
Maxim Integrated
400
mV
700
10
35
60
mA
120
TA = -40NC to +85NC
150
TA = -40NC to +125NC
170
TA = +25NC
Output Leakage Current
V/mV
700
TA = -40NC to +125NC
Output Sink Current
V
4.2
ISINK P 4mA
nA
±150
-0.1
MAX9647 only
nA
Q50
±150
TA = +25NC
Output Saturation Voltage
Q250
TA = -40NC to +85NC
VCM
AV
mV
mV
TA = -40NC to +125NC
Input Voltage Range
UNITS
2
Q0.007
TA = +25NC
Input Offset Current
7
9
MAX9648 only
IB
MAX
0.4
TA = -40NC to +85NC
TA = +25NC
Input Bias Current
TYP
FA
0.005
TA = -40NC to +85NC
1
TA = -40NC to +125NC
2
FA
3
MAX9647/MAX9648
General-Purpose, Low-Voltage,
Tiny Pack Comparators
AC ELECTRICAL CHARACTERISTICS–5.0V OPERATION
(VDD = 5V, VSS = 0V, VCM = 0V, RL = 5.1kI connected to VDD, typical values are at TA = +25NC, unless otherwise noted. Boldface
limits apply at the defined temperature extremes.) (Note 2)
PARAMETER
SYMBOL
Propagation Delay Output
High to Low (Note 4)
tPHL
Propagation Delay Output
Low to High (Note 4)
tPLH
CONDITIONS
MIN
TYP
Input overdrive = 10mV
70
Input overdrive = 100mV
50
Input overdrive = 10mV
110
Input overdrive = 100mV
100
MAX
UNITS
ns
ns
DC ELECTRICAL CHARACTERISTICS—1.8V OPERATION
(VDD = 1.8V, VSS = 0V, VCM = 0V, RL = 5.1kI connected to VDD, typical values are at TA = +25NC, unless otherwise noted. Boldface
limits apply at the defined temperature extremes.) (Note 2)
PARAMETER
Input Offset Voltage
SYMBOL
Input Voltage Hysteresis
Input Offset Voltage Average
Temperature Drift
Input Bias Current
Input Offset Current
Input Voltage Range
CONDITIONS
MIN
TYP
MAX
UNITS
0.4
5
mV
VOS
MAX9648 only
2
mV
TCVOS
1.5
FV/NC
IB
0.0003
nA
IOS
0.0003
nA
-0.1
VCM
V
1
Output Saturation Voltage
VSAT
ISINK P 1mA
Power-Supply Rejection Ratio
PSRR
VDD = 1.8V to 5.5V
60
56
mV
90
dB
Output Sink Current
IO
VO P 1.5V
6.4
Supply Current
IS
(Note 3)
50
Output Leakage Current
mA
100
0.001
FA
FA
AC ELECTRICAL CHARACTERISTICS—1.8V OPERATION
(VDD = 1.8V, VSS = 0V, VCM = 0V, RL = 5.1kI connected to VDD, typical values are at TA = +25NC, unless otherwise noted. Boldface
limits apply at the defined temperature extremes.) (Note 2)
PARAMETER
SYMBOL
Propagation Delay Output
High to Low (Note 4)
tPHL
Propagation Delay Output
Low to High (Note 4)
tPLH
CONDITIONS
MIN
TYP
Input overdrive = 10mV
70
Input overdrive = 100mV
60
Input overdrive = 10mV
120
Input overdrive = 100mV
110
MAX
UNITS
ns
ns
Note 2: All devices are production tested at TA = +25NC. All temperature limits are guaranteed by design.
Note 3: Supply current when output is high.
Note 4: Input overdrive is the overdrive voltage beyond the offset and hysteresis-determined trip points.
Maxim Integrated
4
MAX9647/MAX9648
General-Purpose, Low-Voltage,
Tiny Pack Comparators
Typical Operating Characteristics
(VDD = 5V, VSS = 0V, VCM = 0V, RL = 5.1kI, CL = 10pF, overdrive = 100mV, TA = +25NC, unless otherwise noted.)
SUPPLY CURRENT
vs. SUPPLY VOLTAGE
SUPPLY CURRENT
vs. SUPPLY VOLTAGE
70
60
50
40
TA = -40°C
TA = +25°C
30
TA = +85°C
60
MAX9647 toc02
TA = +85°C
TA = +125°C
SUPPLY CURRENT (µA)
SUPPLY CURRENT (µA)
80
70
MAX9647 toc01
90
TA = +125°C
50
40
TA = +25°C
TA = -40°C
30
20
20
10
VOUT = HIGH
0
1
1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0
4
5
SUPPLY CURRENT vs. FREQUENCY
(VOVERDRIVE = 10mV)
INPUT OFFSET VOLTAGE
vs. TEMPERATURE
MAX9647 toc03
700
VDD = 5V
600
500
VDD = 2.7V
400
300
200
1.2
INPUT OFFSET VOLTAGE (mV)
6
VDD = 5V
1.0
0.8
0.6
VDD = 2.7V
VDD = 1.8V
0.4
0.2
100
VDD = 1.8V
0
0
10
100
1k
10k
100k
-50
1M
-25
0
25
50
75
100
INPUT FREQUENCY (Hz)
TEMPERATURE (°C)
INPUT BIAS CURRENT
vs. TEMPERATURE
OUTPUT VOLTAGE LOW
vs. PULLUP RESISTOR
MAX9647 toc05
0.6
0.5
0.4
VDD = 5V
0.3
VDD = 1.8V
0.2
VDD = 2.7V
300
OUTPUT VOLTAGE LOW (mV)
1
125
VOL - VEE
250
MAX9647 toc06
SUPPLY CURRENT (µA)
3
SUPPLY VOLTAGE (V)
800
INPUT BIAS CURRENT (nA)
2
SUPPLY VOLTAGE (V)
900
200
150
100
50
0.1
0
0
-50
-25
0
25
50
75
TEMPERATURE (°C)
Maxim Integrated
VOUT = LOW
0
MAX9647 toc04
10
100
125
100
1k
10k
100k
PULLUP RESISTANCE (I)
5
MAX9647/MAX9648
General-Purpose, Low-Voltage,
Tiny Pack Comparators
Typical Operating Characteristics (continued)
(VDD = 5V, VSS = 0V, VCM = 0V, RL = 5.1kI, CL = 10pF, overdrive = 100mV, TA = +25NC, unless otherwise noted.)
PROPAGATION DELAY vs. TEMPERATURE
(VOVERDRIVE = 100mV)
PROPAGATION DELAY vs. CAPACITIVE LOAD
(VOVERDRIVE = 100mV)
400
tPLH
300
200
tPHL
tPHL
60
40
0
0
20
40
60
0
25
50
75
PROPAGATION DELAY
vs. INPUT OVERDRIVE (tPLH)
PROPAGATION DELAY
vs. INPUT OVERDRIVE (tPHL)
TA = +125°C
80
TA = +85°C
70
MAX9647 toc10
TA = +25°C
TA = +40°C
110
80
75
PROPAGATION DELAY (ns)
120
125
100
TEMPERATURE (°C)
130
90
-25
CAPACITIVE LOAD (pF)
140
100
-50
100
80
MAX9647 toc09
0
PROPAGATION DELAY (ns)
tPLH
80
20
100
70
65
TA = +85°C
60
TA = +125°C
TA = -40°C
55
TA = +25°C
50
45
60
40
50
35
30
40
10
10
1000
100
100
1000
INPUT OVERDRIVE VOLTAGE (mV)
INPUT OVERDRIVE VOLTAGE (mV)
INPUT HYSTERESIS VOLTAGE
vs. TEMPERATURE
PROPAGATION DELAY
100mV OVERDRIVE
MAX9647 toc12
MAX9647 toc11
3.0
INPUT HYSTERESIS VOLTAGE (mV)
MAX9647 toc08
100
PROPIGATION DELAY (ns)
500
PROPAGATION DELAY (ns)
120
MAX9647 toc07
600
VDD = 5V
2.5
VIN
2.0
1.5
VDD = 2.7V
VDD = 1.8V
1.0
0.5
VOUT
0
-50
-25
0
25
50
75
100
125
100ns/div
TEMPERATURE (°C)
Maxim Integrated
6
MAX9647/MAX9648
General-Purpose, Low-Voltage,
Tiny Pack Comparators
Typical Operating Characteristics (continued)
(VDD = 5V, VSS = 0V, VCM = 0V, RL = 5.1kI, CL = 10pF, overdrive = 100mV, TA = +25NC, unless otherwise noted.)
500kHz RESPONSE
100mV OVERDRIVE
PROPAGATION DELAY
10mV OVERDRIVE
MAX9647 toc14
MAX9647 toc13
VIN
VIN
VOUT
VOUT
100ns/div
400ns/div
500kHz RESPONSE
10mV OVERDRIVE
100kHz RESPONSE
100mV OVERDRIVE
MAX9647 toc16
MAX9647 toc15
VIN
VIN
VOUT
VOUT
2µs/div
400ns/div
100kHz RESPONSE
10mV OVERDRIVE
POWER-UP RESPONSE
MAX9647 toc18
MAX9647 toc17
VIN+
200mV/div
VIN
VDD
2V/div
VOUT
2V/div
VOUT
2µs/div
Maxim Integrated
4µs/div
7
MAX9647/MAX9648
General-Purpose, Low-Voltage,
Tiny Pack Comparators
Pin Configuration
TOP VIEW
+
IN+
1
VSS
2
IN-
3
MAX9647
MAX9648
5
VDD
4
OUT
SC70/SOT23
Pin Description
PIN
NAME
FUNCTION
1
IN+
Noninverting Input
2
VSS
Negative Supply (Connect to GND)
3
IN-
Inverting Input
4
OUT
Comparator Output (Open Drain)
5
VDD
Positive Supply
Detailed Description
Applications Information
The MAX9647/MAX9648 are low-cost, general-purpose
comparators that have a single-supply +1.8V to +5V
operating voltage range. The common-mode input range
extends from -0.1V below the negative supply to within
+0.7V of the positive supply. They require approximately
60FA per comparator with a 5V supply and 52FA with a
2.7V supply.
Many comparators oscillate in the linear region of
operation because of noise or undesired parasitic feedback. This tends to occur when the voltage on one input
is equal or very close to the voltage on the other input.
The MAX9648 has internal hysteresis to counter parasitic
effects and noise.
The MAX9648 has 2mV of hysteresis for noise
immunity. This significantly reduces the chance of output
oscillations even with slow-moving input signals. See the
Typical Operating Characteristics.
Maxim Integrated
Hysteresis
The hysteresis in a comparator creates two trip points:
one for the rising input voltage and one for the falling
input voltage (Figure 1). The difference between the trip
points is the hysteresis. When the comparator’s input
voltages are equal, the hysteresis effectively causes
one comparator input to move quickly past the other,
thus taking the input out of the region where oscillation
occurs. This provides clean output transitions for noisy,
slow-moving input signals.
8
MAX9647/MAX9648
General-Purpose, Low-Voltage,
Tiny Pack Comparators
Additional hysteresis can be generated with two
resistors using positive feedback (Figure 2). Use the
following procedure to calculate resistor values:
1) Find output voltage when output is high:
Select R2. In this example, choose 1kΩ.
Select VHYST. In this example, choose 50mV.
Solve for R1.
VHYST = VOUT(HIGH)(R2/(R1 + R2))V
VOUT(HIGH) = VDD - ILOAD x RL
2) Find the trip points of the comparator using these
formulas:
VTH = VREF + ((VOUT(HIGH) - VREF)R2)/(R1 + R2)
VTL = VREF (1 - (R2/(R1 + R2)))
where VTH is the threshold voltage at which the
comparator switches its output from high to low as
VIN rises above the trip point, and VTL is the threshold
voltage at which the comparator switches its output from
low to high as VIN drops below the trip point.
3) The hysteresis band is:
VHYST = VTH - VTL = VDD(R2/(R1 + R2))
In this example, let VDD = 5V, VREF = 2.5V, ILOAD =
50nA, and RL = 5.1kΩ.
VOUT(HIGH) = 5.0V - (50 x 10-9 x 5.1 x 103I) ≈ 5.0V
VTH = 2.5 + 2.5(R2/(R1 + R2))
VTL = 2.5(1 - (R2/(R1 + R2)))
where R1 ≈ 100kΩ, VTH = 2.525V, and VTL = 2.475V
Choose R1 and R2 to be large enough as not to exceed
the amount of current the reference can supply.
The source current required is VREF/(R1 + R2).
The sink current is (VOUT(HIGH) - VREF) x (R1 + R2).
Choose RL to be large enough to avoid drawing excess
current, yet small enough to supply the necessary
current to drive the load. RL should be between 1kI and
10kΩ. Choose R1 to be much larger than RL to avoid
lowering VOUT(HIGH) ir raising VOUT(LOW).
Board Layout and Bypassing
Use 0.1FF bypass capacitors from VDD to VSS. To
maximize performance, minimize stray inductance by
putting this capacitor close to the VDD pin and reducing
trace lengths. For slow moving input signals (rise time
> 1ms), use a 1nF capacitor between IN+ and IN- to
reduce high-frequency noise.
VDD
THRESHOLDS
IN+
IN-
0.050V = 5(1000/(R1 + 1000))V
VHYST
HYSTERESIS
BAND
RL
R1
VTH
VTL
R2
VREF
VDD
IN+
OUT
VIN
OUT
Figure 1. Threshold Hysteresis Band (Not to Scale)
Maxim Integrated
IN-
VOUT
MAX9647
VSS
Figure 2. Adding Hysteresis with External Resistors
9
MAX9647/MAX9648
General-Purpose, Low-Voltage,
Tiny Pack Comparators
Chip Information
Package Information
Ordering 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.
PROCESS: BiCMOS
TEMP
RANGE
PINPACKAGE
TOP
MARK
MAX9647AXK+T
-40NC to
+125NC
5 SC70
+AUS
MAX9647AUK+T
-40NC to
+125NC
5 SOT23
MAX9648AXK+T
-40NC to
+125NC
5 SC70
+AUT
MAX9648AUK+T
-40NC to
+125NC
5 SOT23
+AFLN
PART
PACKAGE
TYPE
PACKAGE
CODE
OUTLINE
NO.
LAND
PATTERN NO.
5 SC70
X5+1
21-0076
90-0188
5 SOT23
U5+1
21-0057
90-0174
+AFLM
+Denotes a lead(Pb)-free/RoHS-compliant package.
T = Tape and reel.
Maxim Integrated
10
MAX9647/MAX9648
General-Purpose, Low-Voltage,
Tiny Pack Comparators
Revision History
REVISION
NUMBER
REVISION
DATE
0
10/11
Initial release
—
1
1/12
Revised the Typical Operating Characteristics.
6
2
1/13
Updated the Absolute Maximum Ratings, added the Package Thermal
Characteristics, and revised the Electrical Characteristics.
2–4
3
4/15
No /V OPNs; deleted “Automotive Applications” from Applications section
and automotive reference from Detailed Description section
1, 8
DESCRIPTION
PAGES
CHANGED
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 160 Rio Robles, San Jose, CA 95134 USA 1-408-601-1000
© 2015
Maxim Integrated
11
Maxim Integrated and the Maxim Integrated logo are trademarks of Maxim Integrated Products, Inc.
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