MAXIM MAX9647_12

19-5968; Rev 1; 1/12
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
Automotive Applications
Ordering Information appears at end of data sheet.
Battery-Powered Electronics
General-Purpose Portable Devices
General-Purpose Low-Voltage Applications
For related parts and recommended products to use with this part,
refer to www.maxim-ic.com/MAX9647.related.
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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.
MAX9647/MAX9648
General-Purpose, Low-Voltage,
Tiny Pack Comparators
ABSOLUTE MAXIMUM RATINGS
Supply Voltage (VDD to VSS)...................................-0.3V to +6V
All Other Pins.................................. (VSS - 0.3V) to (VDD + 0.3V)
Continuous Power Dissipation (TA = +70NC)
SC70 (derate 3.1 mW/NC above +70NC)......................247mW
SOT23 (derate 7.1 mW/NC above +70NC)....................571mW
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.
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 1)
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
Input Voltage Range
Voltage Gain
IOS
Output Saturation Voltage
VSAT
0.4
7
mV
2
mV
1.5
FV/NC
Q250
±400
TA = -40NC to +125NC
±400
Q0.0003
±150
TA = -40NC to +125NC
±150
-0.1
500
ISINK P 1mA
IO
VO P 1.5V
Supply Current
IS
(Note 2)
5
nA
V
2.0
MAX9647 only
nA
Q50
TA = -40NC to +85NC
Output Sink Current
V/mV
25
mV
16
mA
52
100
FA
TA = -40NC to +85NC
1
FA
TA = -40NC to +125NC
2
0.005
TA = +25NC
Output Leakage Current
UNITS
TA = -40NC to +85NC
VCM
AV
MAX
Q0.0003
TA = +25NC
Input Offset Current
TYP
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 1)
PARAMETER
SYMBOL
Propagation Delay Output
High to Low (Note 3)
tPHL
Propagation Delay Output
Low to High (Note 3)
tPLH
CONDITIONS
MIN
TYP
Input overdrive = 10mV
70
Input overdrive = 100mV
50
Input overdrive = 10mV
115
Input overdrive = 100mV
100
MAX
UNITS
ns
ns
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MAX9647/MAX9648
General-Purpose, Low-Voltage,
Tiny Pack Comparators
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 1)
PARAMETER
SYMBOL
CONDITIONS
MIN
TA = +25NC
Input Offset Voltage
VOS
TYP
MAX
0.4
7
TA = -40NC to +85NC
9
TA = -40NC to +125NC
Input Voltage Hysteresis
Input Offset Voltage Average
Temperature Drift
TCVOS
IB
2
mV
1.5
FV/NC
Q0.007
TA = -40NC to +85NC
Input Voltage Range
Voltage Gain
Q0.007
±150
TA = -40NC to +125NC
±150
-0.1
MAX9647 only
20
Output Sink Current
VSAT
IO
ISINK P 4mA
IS
400
700
TA = -40NC to +125NC
700
10
VO P 1.5V
35
60
TA = -40NC to +85NC
mV
mA
120
150
TA = -40NC to +125NC
FA
170
0.005
TA = +25NC
Output Leakage Current
V/mV
TA = -40NC to +85NC
TA = +25NC
Supply Current (Note 2)
500
120
nA
V
4.2
TA = +25NC
Output Saturation Voltage
Q50
TA = -40NC to +85NC
VCM
AV
nA
±400
TA = +25NC
IOS
Q250
±400
TA = -40NC to +125NC
Input Offset Current
mV
9
MAX9648 only
TA = +25NC
Input Bias Current
UNITS
TA = -40NC to +85NC
1
TA = -40NC to +125NC
2
FA
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 1)
PARAMETER
SYMBOL
Propagation Delay Output
High to Low (Note 3)
tPHL
Propagation Delay Output
Low to High (Note 3)
tPLH
CONDITIONS
MIN
TYP
Input overdrive = 10mV
70
Input overdrive = 100mV
50
Input overdrive = 10mV
110
Input overdrive = 100mV
100
MAX
UNITS
ns
ns
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MAX9647/MAX9648
General-Purpose, Low-Voltage,
Tiny Pack Comparators
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 1)
PARAMETER
Input Offset Voltage
SYMBOL
Input Bias Current
MIN
TYP
MAX
UNITS
0.4
5
mV
VOS
Input Voltage Hysteresis
Input Offset Voltage Average
Temperature Drift
CONDITIONS
MAX9648 only
2
mV
TCVOS
1.5
FV/NC
IB
0.0003
nA
Input Offset Current
IOS
0.0003
nA
Input Voltage Range
VCM
Output Saturation Voltage
VSAT
ISINK P 1mA
Power-Supply Rejection Ratio
PSRR
VDD = 1.8V to 5.5V
-0.1
V
1
56
60
mV
90
dB
Output Sink Current
IO
VO P 1.5V
6.4
mA
Supply Current
IS
(Note 2)
50
Output Leakage Current
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 1)
PARAMETER
SYMBOL
Propagation Delay Output
High to Low (Note 3)
tPHL
Propagation Delay Output
Low to High (Note 3)
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 1: All devices are production tested at TA = +25NC. All temperature limits are guaranteed by design.
Note 2: Supply current when output is high.
Note 3: Input overdrive is the overdrive voltage beyond the offset and hysteresis-determined trip points.
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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
3
4
5
SUPPLY VOLTAGE (V)
SUPPLY CURRENT vs. FREQUENCY
(VOVERDRIVE = 10mV)
INPUT OFFSET VOLTAGE
vs. TEMPERATURE
700
VDD = 5V
600
500
VDD = 2.7V
400
300
200
1.2
INPUT OFFSET VOLTAGE (mV)
MAX9647 toc03
800
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)
2
SUPPLY VOLTAGE (V)
900
INPUT BIAS CURRENT (nA)
VOUT = LOW
0
MAX9647 toc04
10
200
150
100
50
0.1
0
0
-50
-25
0
25
50
75
TEMPERATURE (°C)
100
125
100
1k
10k
100k
PULLUP RESISTANCE (I)
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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)
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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
4µs/div
����������������������������������������������������������������� Maxim Integrated Products 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. The ICs are
ideal for automotive applications because they operate from -40NC to +125NC. See the Typical Operating
Characteristics.
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.
����������������������������������������������������������������� Maxim Integrated Products 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 1kI.
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 = 5.1kI.
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 ≈ 100kI, 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
10kI. 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
VOUT
IN-
MAX9647
VSS
OUT
Figure 1. Threshold Hysteresis Band (Not to Scale)
Figure 2. Adding Hysteresis with External Resistors
����������������������������������������������������������������� Maxim Integrated Products 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.maxim-ic.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.
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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
DESCRIPTION
PAGES
CHANGED
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. 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 Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600
© 2012
Maxim Integrated Products 11
Maxim is a registered trademark of Maxim Integrated Products, Inc.