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19-1958; Rev 2; 1/02
General-Purpose, Low-Voltage, Single/Dual/Quad, Tiny-Pack Comparators
General Description
The LMX331/LMX393/LMX339 single/dual/quad comparators are drop-in, pin-for-pin-compatible replacements for the LMV331/LMV393/LMV339. The LMX331H/ LMX393H/LMX339H offer the performance of the LMX331/LMX393/LMX339 with the added benefit of internal hysteresis to provide noise immunity, preventing output oscillations even with slow-moving input signals. Advantages of the LMX331/LMX393/LMX339 series include low supply voltage, small package, and low cost. The LMX331 is available in both 5-pin SC70 and SOT23 packages, LMX393 is available in both 8-pin MAX and smaller SOT23 packages, and the LMX339 is available in 14-pin TSSOP and SO packages. They are manufactured using advanced submicron CMOS technology. Designed with the most modern techniques, the LMX331/LMX393/LMX339 achieve superior performance over BiCMOS or bipolar versions on the market. The LMX331/LMX393/LMX339 offer performance advantages such as wider supply voltage range, wider operating temperature range, better CMRR and PSRR, improved response time characteristics, reduced offset, reduced output saturation voltage, reduced input bias current, and improved RF immunity.
Features
o Guaranteed 1.8V to 5.5V Performance o -40C to +125C Automotive Temperature Range o Low Supply Current (60A/Comparator at VDD = 5.0V) o Input Common-Mode Voltage Range Includes Ground o No Phase Reversal for Overdriven Inputs o Low Output Saturation Voltage (100mV) o Internal 2mV Hysteresis (LMX331H/LMX393H/LMX339H) o 5-Pin SC70 Space-Saving Package (2.0mm 2.1mm 1.0mm) (LMX331/LMX331H)
LMX331/LMX393/LMX339
Ordering Information
PART LMX331AXK-T LMX331AUK-T LMX331HAXK-T LMX331HAUK-T TEMP RANGE -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C PINPACKAGE 5 SC70-5 5 SOT23-5 5 SC70-5 5 SOT23-5 8 SOT23-8 8 MAX 8 SOT23-8 8 MAX 14 TSSOP 14 SO 14 TSSOP 14 SO TOP MARK ACD ADQR ACE ADQS AAIF -- AAIG -- -- -- -- --
Applications
Mobile Communications Notebooks and PDAs Automotive Applications Battery-Powered Electronics General-Purpose Portable Devices General-Purpose Low-Voltage Applications
LMX393AKA-T LMX393AUA LMX393HAKA-T LMX393HAUA LMX339AUD LMX339ASD LMX339HAUD LMX339HASD
Pin Configurations
TOP VIEW
LMX331/LMX331H
OUTB 1 5 VDD
OUTA 1 2 3 4 B
LMX393/LMX393H
LMX339/LMX339H
14 OUTC 13 OUTD 12 VSS
IN+
1
OUTA 2
8 7 6 5 VDD OUTB INBINB+ INAINA+
VDD 3 INA- 4 INA+ 5 INB- 6 B C A D
VSS 2
A
11 IND+ 10 IND9 8 INC+ INC-
IN- 3
4 OUT
VSS
SOT23/MAX SC70/SOT23
INB+ 7
TSSOP/SO
________________________________________________________________ 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.
General-Purpose, Low-Voltage, Single/Dual/Quad, Tiny-Pack Comparators LMX331/LMX393/LMX339
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 = +70C) 5-Pin SC70 (derate 3.1mW/C above +70C) ..............247mW 5-Pin SOT23 (derate 7.1mW/C above +70C)............571mW 8-Pin SOT23 (derate 8.9mW/C above +70C)............714mW 8-Pin MAX (derate 10.3mW/C above +70C) ...........825mW 14-Pin TSSOP (derate 9.1mW/C above +70C) .........727mW 14-Pin SO (derate 8.3mW/C above +70C).............666.7mW Operating Temperature Range .........................-40C to +125C Junction Temperature ......................................................+150C Storage Temperature Range .............................-65C to +150C Lead Temperature (soldering, 10s) .................................+300C
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 = 0, VCM = 0, RL = 5.1k connected to VDD. Typical values are at TA = +25C.) (Note 1)
PARAMETER Input Offset Voltage Input Voltage Hysteresis Input Offset Voltage Average Temperature Drift Input Bias Current SYMBOL VOS VHYST TCVOS TA = +25C IB TA = -40C to +85C TA = -40C to +125C TA = +25C Input Offset Current IOS TA = -40C to +85C TA = -40C to +125C Input Voltage Range Voltage Gain Output Saturation Voltage Output Sink Current Supply Current (Note 2) VCM AV VSAT IO IS LMX331/LMX393/LMX339 only ISINK 1mA VO 1.5V LMX331/LMX331H LMX393/LMX393H (both comparators) LMX339/LMX339H (all four comparators) TA = +25C Output Leakage Current TA = -40C to +85C TA = -40C to +125C 5 -0.1 2.0 50 50 37 50 70 140 0.003 1 2 A 100 140 200 A 0.05 LMX331H/LMX393H/LMX339H only CONDITIONS MIN TYP 0.2 2 5 0.05 250 400 400 50 150 150 V V/mV mV mA nA nA MAX 7 UNITS mV mV V/C
AC ELECTRICAL CHARACTERISTICS--2.7V OPERATION
(VDD = 2.7V, VSS = 0, VCM = 0, RL = 5.1k connected to VDD. Typical values are at TA = +25C.) (Note 1)
PARAMETER Propagation Delay Output High to Low Propagation Delay Output Low to High SYMBOL tPHL tPLH CONDITIONS Input overdrive = 10mV (Note 3) Input overdrive = 100mV (Note 3) Input overdrive = 10mV (Note 3) Input overdrive = 100mV (Note 3) MIN TYP 500 100 500 100 MAX UNITS ns ns
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General-Purpose, Low-Voltage, Single/Dual/Quad, Tiny-Pack Comparators
DC ELECTRICAL CHARACTERISTICS--5.0V OPERATION
(VDD = 5V, VSS = 0, VCM = 0, RL = 5.1k connected to VDD. Typical values are at TA = +25C.) (Note 1)
PARAMETER Input Offset Voltage Input Voltage Hysteresis Input Offset Voltage Average Temperature Drift Input Bias Current TCVOS TA = +25C IB TA = -40C to +85C TA = -40C to +125C TA = +25C Input Offset Current IOS TA = -40C to +85C TA = -40C to +125C Input Voltage Range Voltage Gain Output Saturation Voltage Output Sink Current VCM AV VSAT IO LMX331/LMX393/LMX339 only TA = +25C ISINK 4mA VO 1.5V TA = +25C LMX331/LMX331H TA = -40C to +85C TA = -40C to +125C Supply Current (Note 2) IS LMX393/LMX393H (both comparators) TA = +25C TA = -40C to +85C TA = -40C to +125C LMX339/LMX339H (all four comparators) TA = +25C Output Leakage Current TA = -40C to +85C TA = -40C to +125C TA = +25C TA = -40C to +85C TA = -40C to +125C 0.003 1 2 A 170 100 TA = -40C to +85C TA = -40C to +125C 10 73 60 120 150 170 200 250 300 300 350 430 A 20 -0.1 4.2 50 70 400 700 700 mA mV 0.05 SYMBOL TA = +25C VOS TA = -40C to +85C TA = -40C to +125C LMX331H/LMX393H/LMX339H only 2 5 0.05 250 400 400 50 150 150 V V/mV nA nA CONDITIONS MIN TYP 0.25 MAX 7 9 9 mV V/C mV UNITS
LMX331/LMX393/LMX339
AC ELECTRICAL CHARACTERISTICS--5.0V OPERATION
(VDD = 5V, VSS = 0, VCM = 0, RL = 5.1k connected to VDD. Typical values are at TA = +25C.) (Note 1)
PARAMETER Propagation Delay Output High to Low Propagation Delay Output Low to High SYMBOL tPHL tPLH CONDITIONS Input overdrive = 10mV (Note 3) Input overdrive = 100mV (Note 3) Input overdrive = 10mV (Note 3) Input overdrive = 100mV (Note 3) MIN TYP 400 90 600 200 MAX UNITS ns ns
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General-Purpose, Low-Voltage, Single/Dual/Quad, Tiny-Pack Comparators LMX331/LMX393/LMX339
DC ELECTRICAL CHARACTERISTICS--1.8V OPERATION
(VDD = 1.8V, VSS = 0, VCM = 0, RL = 5.1k connected to VDD. Typical values are at TA = +25C.)
PARAMETER Input Offset Voltage Input Voltage Hysteresis Input Offset Voltage Average Temperature Drift Input Bias Current Input Offset Current Input Voltage Range Output Saturation Voltage Power-Supply Rejection Ratio Output Sink Current Supply Current (Note 2) Output Leakage Current TCVOS IB IOS VCM VSAT PSRR IO IS ISINK 1mA VDD = 1.8V to 5.5V VO 1.5V LMX331/LMX331H LMX393/LMX393H (both comparators) LMX339/LMX339H (all four comparators) 60 SYMBOL VOS LMX331H/LMX393H/LMX339H only CONDITIONS MIN TYP 0.2 2 5 0.05 0.05 -0.1 1 35 70 15 40 65 120 0.003 100 140 200 A A MAX 5 UNITS mV mV V/C nA nA V mV dB mA
AC ELECTRICAL CHARACTERISTICS--1.8V OPERATION
(VDD = 1.8V, VSS = 0, VCM = 0, RL = 5.1k connected to VDD. Typical values are at TA = +25C.)
PARAMETER Propagation Delay Output High to Low Propagation Delay Output Low to High SYMBOL tPHL tPLH CONDITIONS Input overdrive = 10mV (Note 3) Input overdrive = 100mV (Note 3) Input overdrive = 10mV (Note 3) Input overdrive = 100mV (Note 3) MIN TYP 500 100 500 100 MAX UNITS ns ns
Note 1: All devices are production tested at +25C. 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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General-Purpose, Low-Voltage, Single/Dual/Quad, Tiny-Pack Comparators
Typical Operating Characteristics
(VDD = 5V, VSS = 0, VCM = 0, RL = 5.1k, CL = 10pF, overdrive = 100mV, TA = +25C, unless otherwise noted.)
LMX331 SUPPLY CURRENT vs. SUPPLY VOLTAGE
LMX331 toc01
LMX331/LMX393/LMX339
LMX331 SUPPLY CURRENT vs. SUPPLY VOLTAGE
160 SUPPLY CURRENT (A) 140 120 100 80 60 40 20 0 VOUT = LOW 1 2 3 4 5 6 TA = +25C TA = -40C TA = +125C TA = +85C
LMX331 toc02
INPUT OFFSET VOLTAGE vs. TEMPERATURE
LMX331 toc03
100 90 80 SUPPLY CURRENT (A) 70 60 50 40 30 20 10 0 1 2 3 4 5 6 SUPPLY VOLTAGE (V) VOUT = HIGH TA = +25C TA = -40C TA = +125C TA = +85C
180
1.5
INPUT OFFSET VOLTAGE (mV)
1.0 VDD = 5.0V
0.5
0
VDD = 2.7V
-0.5
VDD = 1.8V
-1.0 -40 -20 0 20 40 60 80 100 120 SUPPLY VOLTAGE (V) TEMPERATURE (C)
OUTPUT LOW VOLTAGE vs. SINK CURRENT
LMX331 toc04
OUTPUT LOW VOLTAGE vs. TEMPERATURE
IOUT = 4mA OUTPUT LOW VOLTAGE (mV) 110 100 90 80 70 60
LMX331 toc05
PROPAGATION DELAY vs. CAPACITIVE LOAD
LMX331 toc06
140 120 OUTPUT LOW VOLTAGE (mV) 100 80 VDD = 1.8V 60 40 20 0 0 1 2 3 SINK CURRENT (mA) 4 VDD = 5.0V VDD = 2.7V
120
600 500 PROPAGATION DELAY (ns) 400 300 200 tPHL 100 0 tPLH
-40
-20
0
20
40
60
80
100 120
0
20
40
60
80
100
120
TEMPERATURE (C)
CAPACITIVE LOAD (pF)
PROPAGATION DELAY vs. TEMPERATURE
LMX331 toc07
PROPAGATION DELAY vs. INPUT OVERDRIVE (tPLH)
LMX331 toc08
450 PROPAGATION DELAY (ns) 400 350 300 250 200 150 100 TA = +85C TA = +125C TA = +25C TA = -40C
180 PROPAGATION DELAY (ns) 160 140 120 100 80 60 40 20 0 TA = +85C TA = +125C TA = +25C TA = -40C
150 PROPAGATION DELAY (ns) 125 100 75 tPHL 50 25 0 -40 -20 0 20 40 60 80 tPLH
50 0 100 120 0 25 50 75 100 125 150 TEMPERATURE (C) INPUT OVERDRIVE (mV)
0
25
50
75
100
125
150
INPUT OVERDRIVE (mV)
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LMX331 toc09
175
500
PROPAGATION DELAY vs. INPUT OVERDRIVE (tPHL)
200
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General-Purpose, Low-Voltage, Single/Dual/Quad, Tiny-Pack Comparators LMX331/LMX393/LMX339
Typical Operating Characteristics (continued)
(VDD = 5V, VSS = 0, VCM = 0, RL = 5.1k, CL = 10pF, overdrive = 100mV, TA = +25C, unless otherwise noted.)
LMX331H/LMX393H/LMX339H HYSTERESIS vs. TEMPERATURE
LMX331 toc10
LMX331H/LMX393H/LMX339H HYSTERESIS vs. SUPPLY VOLTAGE
LMX331 toc11
PROPAGATION DELAY 100mV OVERDRIVE
LMX331 toc12
3.0 2.5 HYSTERESIS (mV) 2.0 1.5 1.0 0.5 0 -40 -20 0 20 40 60 80
5
4 HYSTERESIS (mV)
(IN-) - IN+ 100mV/div
3
2
1
OUT 2V/div 1 2 3 4 5 6 TIME (200ns/div)
0 100 120 TEMPERATURE (C) SUPPLY VOLTAGE (V)
PROPAGATION DELAY 10mV OVERDRIVE
LMX331 toc13
500kHz RESPONSE 100mV OVERDRIVE
LMX331 toc14
500kHz RESPONSE 10mV OVERDRIVE
LMX331 toc15
(IN-) - IN+ 10mV/div
(IN-) - IN+ 100mV/div
(IN-) - IN+ 10mV/div
OUT 2V/div TIME (200ns/div)
OUT 2V/div TIME (500ns/div)
OUT 2V/div TIME (500ns/div)
100kHz RESPONSE 100mV OVERDRIVE
LMX331 toc16
100kHz RESPONSE 10mV OVERDRIVE
LMX331 toc17
POWER-UP RESPONSE
LMX331 toc18
(IN-) - IN+ 100mV/div
(IN-) - IN+ 10mV/div
VDD 2V/div
OUT 2V/div TIME (2s/div)
OUT 2V/div TIME (2s/div)
OUT 2V/div TIME (1s/div)
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General-Purpose, Low-Voltage, Single/Dual/Quad, Tiny-Pack Comparators
Pin Description
LMX331 1 2 3 4 5 -- -- -- -- -- -- -- -- -- -- -- -- PIN LMX393 -- 4 -- -- 8 1 7 2 3 5 6 -- -- -- -- -- -- LMX339 -- 12 -- -- 3 2 1 4 5 7 6 8 9 10 11 13 14 NAME IN+ VSS INOUT VDD OUTA OUTB INAINA+ INB+ INBINCINC+ INDIND+ OUTD OUTC FUNCTION Noninverting Input Negative Supply (Connect to GND) Inverting Input Comparator Output (Open-Drain) Positive Supply Comparator A Output (Open-Drain) Comparator B Output (Open-Drain) Comparator A Inverting Input Comparator A Noninverting Input Comparator B Noninverting Input Comparator B Inverting Input Comparator C Inverting Input Comparator C Noninverting Input Comparator D Inverting Input Comparator D Noninverting Input Comparator D Output (Open-Drain) Comparator C Output (Open-Drain)
LMX331/LMX393/LMX339
Detailed Description
The LMX331/LMX393/LMX339 are single/dual/quad, low-cost, general-purpose comparators. They have a single-supply operating voltage of 1.8V to 5V. The common-mode input range extends from -0.1V below the negative supply to within 0.7V of the positive supply. They require approximately 60A per comparator with a 5V supply and 40A with a 2.7V supply. The LMX331H/LMX393H/LMX339H have 2mV of hysteresis for noise immunity. This significantly reduces the chance of output oscillations even with slow-moving input signals. The LMX331/LMX393/LMX339 and LMX331H/LMX393H/LMX339H are ideal for automotive applications because they operate from -40C to +125C (see Typical Operating Characteristics).
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. Additional hysteresis can be generated with two resistors, using positive feedback (Figure 2). Use the following procedure to calculate resistor values:
IN+
THRESHOLDS
Applications Information
Hysteresis
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 LMX331H/LMX393H/LMX339H have internal hysteresis to counter parasitic effects and noise. The hysteresis in a comparator creates two trip points: one for the rising input voltage and one for the falling
INVHYST
HYSTERESIS BAND
VTH VTL
OUT
Figure 1. Threshold Hysteresis Band (Not to Scale)
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7
General-Purpose, Low-Voltage, Single/Dual/Quad, Tiny-Pack Comparators LMX331/LMX393/LMX339
VDD RL R1
VDD R2 VREF IN+ OUT VIN INLMX331 VSS VOUT
where R1 100k, 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) (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 1k and 10k.
Board Layout and Bypassing
Use 0.1F 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 INto reduce high-frequency noise.
Figure 2. Adding Hysteresis with External Resistors
1) Find output voltage when output is high: VOUT(HIGH) = VDD - ILOAD 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 will be: VHYST = VTH - VTL = VDD(R2 / (R1 + R2)) In this example, let VDD = 5V, VREF = 2.5V, ILOAD = 50nA, RL = 5.1k: VOUT(HIGH) = 5.0V - (50 10-9 5.1 103) 5.0V VTH = 2.5V + 2.5V(R2 / (R1 + R2)) VTL = 2.5V(1 - (R2 / (R1 + R2))) Select R2. In this example, we will choose 1k. Select VHYST. In this example, we will choose 50mV. Solve for R1: VHYST = VOUT(HIGH)(R2 / (R1 + R2)) V 0.050V = 5(1000 / (R1 + 1000)) V
Chip Information
LMX331/LMX331H TRANSISTOR COUNT: 112 LMX393/LMX393H TRANSISTOR COUNT: 211 LMX339/LMX339H TRANSISTOR COUNT: 411
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General-Purpose, Low-Voltage, Single/Dual/Quad, Tiny-Pack Comparators
Package Information
SC70, 5L.EPS
LMX331/LMX393/LMX339
_______________________________________________________________________________________
SOT5L.EPS
9
General-Purpose, Low-Voltage, Single/Dual/Quad, Tiny-Pack Comparators LMX331/LMX393/LMX339
Package Information (continued)
SOT23, 8L.EPS
10
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8LUMAXD.EPS
General-Purpose, Low-Voltage, Single/Dual/Quad, Tiny-Pack Comparators
Package Information (continued)
TSSOP,NO PADS.EPS
LMX331/LMX393/LMX339
______________________________________________________________________________________
11
General-Purpose, Low-Voltage, Single/Dual/Quad, Tiny-Pack Comparators LMX331/LMX393/LMX339
Package Information (continued)
SOICN.EPS
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.
12 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 (c) 2002 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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