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19-2064; Rev 0; 6/01
40ns, Low-Power, 3V/5V, Rail-to-Rail Single-Supply Comparators
General Description
The MAX9140/MAX9141 are single and the MAX9142/ MAX9144 are dual/quad high-speed comparators optimized for systems powered from a 3V or 5V supply. The MAX9141 features latch enable and device shutdown. These devices combine high speed, low power, and Rail-to-Rail(R) inputs. Propagation delay is 40ns, while supply current is only 150A per comparator. The input common-mode range of the MAX9140/ MAX9141/MAX9142/MAX9144 extends beyond both power-supply rails. The outputs pull to within 0.3V of either supply rail without external pullup circuitry, making these devices ideal for interface with both CMOS and TTL logic. All input and output pins can tolerate a continuous short-circuit fault condition to either rail. Internal hysteresis ensures clean output switching, even with slow-moving input signals. The MAX9140/MAX9141/MAX9142/MAX9144 are higher-speed, lower-power, and lower-cost upgrades to industry-standard comparators MAX941/MAX942/ MAX944. The MAX9140 are offered in tiny 5-pin SC70 and SOT23 packages. The MAX9141 and MAX9142 are available in 8-pin SOT23 and SO packages, while the MAX9144 is available in both 14-pin SO and TSSOP packages.
Features
o Fast, 40ns Propagation Delay (10mV Overdrive) o Low Power: 0.45mW Power Dissipation Per Comparator (3V) 150A Supply Current o Optimized for 3V and 5V Applications (Operation Down to 2.7V) o Rail-to-Rail Input Voltage Range o Low, 500V Offset Voltage o Internal Hysteresis for Clean Switching o Outputs Swing 300mV of Power Rails o CMOS/TTL-Compatible Outputs o Output Latch (MAX9141 only) o Shutdown Function (MAX9141 only) o Available in SC70 and SOT23 Packages
MAX9140/MAX9141/MAX9142/MAX9144
Ordering Information
PART MAX9140EXK-T MAX9140EUK-T MAX9141EKA-T MAX9141ESA MAX9142EKA-T MAX9142ESA MAX9144EUD MAX9144ESD TEMP. RANGE -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C PINPACKAGE 5 SC70-5 5 SOT23-5 8 SOT23-8 8 SO 8 SOT23-8 8 SO 14 TSSOP 14 SO TOP MARK ACC ADQP AAFD -- AAFE -- -- --
Applications
Line Receivers Battery-Powered Systems Threshold Detectors/Discriminators 3V/5V Systems Zero-Crossing Detectors Sampling Circuits
Pin Configurations
TOP VIEW
OUTA 1 OUT 1 14 OUTD
MAX9140
5
VCC VCC 1 2 IN+
MAX9141
8 7 6 5
N.C. OUT SHDN LE
OUTA INA-
1 2
MAX9142
8 7
INA- 2 VCC OUTB INBINB+ VCC 4 INB+ 5 INB- 6 OUTB 7 INA+ 3
A
MAX9144
D
13 IND12 IND+ 11 GND
GND 2
A B SOT23/SO
IN- 3 IN+ 3 4 INGND 4
INA+ 3 GND 4
6 5
B
C
10 INC+ 9 8 INCOUTC
SOT23/SO SC70/SOT23
TSSOP/SO
Rail-to-Rail is a registered trademark of Nippon Motorola, Ltd. ________________________________________________________________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.
40ns, Low-Power, 3V/5V, Rail-to-Rail Single-Supply Comparators MAX9140/MAX9141/MAX9142/MAX9144
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) LE Input Voltage (MAX9141 only) .........-0.3V to (VCC + 0.3V) SHDN Input Voltage (MAX9141 only)....-0.3V to (VCC + 0.3V) Input/Output Short-Circuit Duration to VCC or GND .....................................................Continuous 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 9.1mW/C above +70C)...........727mW 8-Pin SO (derate 5.9mW/C above +70C)..............470.6mW 14-Pin TSSOP (derate 9.1mW/C above +70C) ........727mW 14-Pin SO (derate 8.33mW/C above +70C)..........666.7mW Operating Temperature Range ...........................-40C to +85C 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.
ELECTRICAL CHARACTERISTICS
(VCC = 5V, VCM = 0, SHDN = LE = VCC (MAX9141 only), CL = 15pF, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.) (Note 1)
PARAMETER Operating Supply Voltage Input Voltage Range Input Offset Voltage Input Hysteresis Input Bias Current Input Offset Current Common-Mode Rejection Ratio Power-Supply Rejection Ratio Output High Voltage Output Low Voltage Output Leakage Current SYMBOL VCC VCMR VOS VHYST IB IOS CMRR PSRR VOH VOL ILEAK VCC = 5.5V (Note 7) 2.7V VCC 5.5V ISOURCE = 4mA ISINK = 4mA SHDN = GND, MAX9141 only (Note 8) MAX9141 MAX9140/MAX9142/ MAX9144 MAX9141 VCM = VCC = 5V MAX9140/MAX9142/ MAX9144 MAX9141 only, SHDN = GND; VCC = VCM = 3V VCM = VCC = 3V Supply Current (Per Comparator) ICC VCC = 3V, VOD = 10mV VOD = 10mV (Note 9) VOD = 10mV (Note 10) VIH VIL IIL, IIH (Note 11) (Note 11) VLOGIC = 0 to VCC (Note 11) VCC/2 + 0.4 VCC 0.425 (Note 2) (Note 3) (Note 4) (Note 5) (Note 6) TA = +25C TA = TMIN to TMAX 1.5 90 8 80 80 VCC 0.3 0.3 0.04 165 150 200 165 12 40 2 2 VCC/2 VCC/2 2 VCC/2 0.4 10 0.425 1 275 250 320 300 30 ns ns ns V V A A 320 120 800 750 CONDITIONS MIN 2.7 -0.2 0.5 TYP MAX 5.5 VCC + 0.2 2 4.5 UNITS V V mV mV nA nA V/V V/V V V A
Propagation Delay Differential Propagation Delay Propagation Delay Skew Logic Input Voltage High Logic Input Voltage Low Logic Input Current
tPD+, tPDdtPD
2
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40ns, Low-Power, 3V/5V, Rail-to-Rail Single-Supply Comparators
ELECTRICAL CHARACTERISTICS (continued)
(VCC = 5V, VCM = 0, SHDN = LE = VCC (MAX9141 only), CL = 15pF, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.) (Note 1)
PARAMETER Data-to-Latch Setup Time Latch-to-Data Hold Time Latch Pulse Width Latch Propagation Delay Shutdown Enable Time Shutdown Disable Time SYMBOL tS tH tLPW tLPD (Note 12) (Note 12) (Note 12) (Note 12) (Note 13) (Note 13) CONDITIONS MIN TYP 16 16 45 60 1 5 MAX UNITS ns ns ns ns s s
MAX9140/MAX9141/MAX9142/MAX9144
Note 1: Note 2: Note 3: Note 4: Note 5:
Note 6: Note 7: Note 8: Note 9: Note 10: Note 11: Note 12: Note 13:
All devices are 100% production tested at TA = +25C. Specifications over temperature are guaranteed by design. Inferred from PSRR test. Inferred from CMRR test. Note also that either or both inputs can be driven to the absolute maximum limit (0.3V beyond either supply rail) without damage or false output inversion. VOS is defined as the center of the input-referred hysteresis zone. See Figure 1. The input-referred trip points are the extremities of the differential input voltage required to make the comparator output change state. The difference between the upper and lower trip points is equal to the width of the input-referred hysteresis zone. See Figure 1. The polarity of IB reverses direction as VCM approaches either supply rail. Specified over the full common-mode voltage range (VCMR). Specification is for current flowing into or out of the output pin for VOUT driven to any voltage from VCC to GND while the part is in shutdown. Specified between any two channels in the MAX9142/MAX9144. Specified as the difference between tPD+ and tPD- for any one comparator. Applies to the MAX9141 only for both SHDN and LE. Applies to the MAX9141 only. Comparator is active with LE driven high and is latched with LE driven low (VOD = 10mV). See Figure 2. Applicable to the MAX9141 only. Comparator is active with the SHDN driven high and is shutdown with SHDN driven low. Shutdown enable time is the delay when the SHDN is driven high to the time the output is valid. Shutdown disable time is the delay when the SHDN is driven low to the time the comparator shuts down.
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3
40ns, Low-Power, 3V/5V, Rail-to-Rail Single-Supply Comparators MAX9140/MAX9141/MAX9142/MAX9144
Typical Operating Characteristics
(VCC = 3.0V, VCM = 0, CL =15pF, VOD = 10mV, TA = +25C, unless otherwise noted.)
MAX9140 SUPPLY CURRENT vs. SUPPLY VOLTAGE
MAX9140 toc01
OUTPUT LOW VOLTAGE vs. TEMPERATURE
ISINK = 4mA 328
MAX9140 TOC02
300 250 TA = +85C 200 ICC (A) 150 100 50 0 3 4 VCC (V) 5 6 TA = -40C
330
VOL (mV)
TA = +25C
326
324
322
320 -40 -20 0 20 40 60 80 100 TEMPERATURE (C)
OUTPUT HIGH VOLTAGE vs. TEMPERATURE
MAX9140 TOC03
OUTPUT SHORT-CIRCUIT (SINK) CURRENT vs. TEMPERATURE
OUTPUT SHORT-CIRCUIT SINK CURRENT (mA)
MAX9140 TOC04
5.20
50
ISOURCE = 4mA VCC = 5.5V
5.15 VOH (V)
45
5.10
40
5.05
5.00 -40 -20 0 20 40 60 80 100 TEMPERATURE (C)
35 -40 -20 0 20 40 60 80 100 TEMPERATURE (C)
OUTPUT SHORT-CIRCUIT (SOURCE) CURRENT vs. TEMPERATURE
OUTPUT SHORT-CIRCUIT SOURCE CURRENT (mA)
MAX9140 TOC05
INPUT BIAS CURRENT vs. TEMPERATURE
MAX9140 toc06
45
140 120 INPUT CURRENT (nA) 100 80 60 40 20
35
25
15 -40 -20 0 20 40 60 80 100 TEMPERATURE (C)
0 -50 -25 0 25 50 75 100 TEMPERATURE (C)
4
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40ns, Low-Power, 3V/5V, Rail-to-Rail Single-Supply Comparators
Typical Operating Characteristics (continued)
(VCC = 3.0V, VCM = 0, CL =15pF, VOD = 10mV, TA = +25C, unless otherwise noted.)
MAX9140/MAX9141/MAX9142/MAX9144
INPUT OFFSET VOLTAGE vs. TEMPERATURE
MAX9140 toc07
TRIP POINT vs. TEMPERATURE
0.8 0.6 0.4 VOS (mV) 0.2 0 -0.2 -0.4 -0.6 -0.8 -1.0 VTRIPVTRIP+
MAX9140 toc08
500 400 300 200 VOS (V) 100 0 -100 -200 -300 -400 -500 -50 -25 0 25 50 75
1.0
100
-50
-25
0
25
50
75
100
TEMPERATURE (C)
TEMPERATURE (C)
INPUT VOLTAGE RANGE vs. TEMPERATURE
MAX9140TOC09
PROPAGATION DELAY vs. INPUT OVERDRIVE
MAX9140 toc10
7 VCC = 5.5V 6 INPUT VOLTAGE RANGE (V) VCMR+ 5 4 3 2 1 0 -1 -40 -20 0 20 40 60 80 VCMR-
45
PROPAGATION DELAY (nS)
40 tPD+ 35 tPD30
25
100
20 0 20 40 60 80 100 INPUT OVERDRIVE (mV)
TEMPERATURE (C)
PROPAGATION DELAY vs. TEMPERATURE
MAX9140 toc11
PROPAGATION DELAY vs. CAPACITIVE LOAD
MAX9140 toc12
50
55 50 PROPAGATION DELAY (ns) 45 40 35 30 25 tPDtPD+
PROPAGATION DELAY (ns)
45 tPD+ 40 tPD35
30
25 -50 -25 0 25 50 75 100 TEMPERATURE (C)
20 15 30 45 60 75 90 105 CAPACITIVE LOAD (pF)
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5
40ns, Low-Power, 3V/5V, Rail-to-Rail Single-Supply Comparators MAX9140/MAX9141/MAX9142/MAX9144
Typical Operating Characteristics (continued)
(VCC = 3.0V, VCM = 0, CL =15pF, VOD = 10mV, TA = +25C, unless otherwise noted.)
PROPAGATION DELAY (tPD-)
MAX9140TOC13
PROPAGATION DELAY (tPD+)
VCC = 5.5V INPUT 50mV/div VOD = 10mV
MAX9140TOC14
SINUSOID RESPONSE AT 4MHz
VCC = 5.5V INPUT 50mV/div
MAX9140TOC15
VOD = 10mV VCC = 5.5V INPUT 50mV/div
OUTPUT 2V/div
OUTPUT 2V/div
OUTPUT 2V/div
10ns/div
10ns/div
50ns/div
Pin Description
PIN NAME MAX9140 MAX9141 -- --
--
FUNCTION Comparator A Output Comparator A Inverting Input Comparator A Noninverting Input Positive Supply Comparator B Noninverting Input Comparator B Inverting Input Comparator B Output Comparator C Output Comparator C Inverting Input Comparator C Noninverting Input Ground Comparator D Noninverting Input Comparator D Inverting Input Comparator D Output Noninverting Input Inverting Input ---- --- Shutdown: MAX9141 is active when SHDN is driven high; ---- --- MAX9141 is in shutdown when SHDN is driven low. The output is latched when LE is low. The latch is transparent when LE is high. Comparator Output No Connection. Not internally connected.
MAX9142 MAX9144 1 2 3 8 5 6 7 -- -- -- 4 -- -- -- -- -- -- -- -- -- 1 2 3 4 5 6 7 8 9 10 11 12 13 14 -- -- -- -- -- -- OUTA INAINA+ VCC INB+ INBOUTB OUTC INCINC+ GND IND+ INDOUTD IN+ IN---- --- SHDN LE OUT N.C.
-- --
--
5 -- -- -- -- -- -- 2 -- -- -- 3 4 -- -- 1 --
1 -- -- -- -- -- -- 4 -- -- -- 2 3 6 5 7 8
6
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40ns, Low-Power, 3V/5V, Rail-to-Rail Single-Supply Comparators
Detailed Description
The MAX9140/MAX9141/MAX9142/MAX9144 singlesupply comparators feature internal hysteresis, high speed, and low power. Their outputs are pulled to within 300mV of either supply rail without external pullup or pulldown circuitry. Rail-to-rail input voltage range and low-voltage single-supply operation make these devices ideal for portable equipment. The MAX9140/MAX9141/MAX9142/MAX9144 interface directly to CMOS and TTL logic. Most high-speed comparators oscillate in the linear region because of noise or undesired parasitic feedback. This tends to occur when the voltage on one input is at or equal to the voltage on the other input. To counter the parasitic effects and noise, the MAX9140/ MAX9141/MAX9142/MAX9144 have an internal hysteresis of 1.5mV. 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. The average of the trip points is the offset voltage. When the comparator's input voltages are equal, the 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 hysteresis to be added with external resistors. The MAX9140/MAX9141/MAX9142/MAX9144's fixed internal hysteresis eliminates these resistors. To increase hysteresis and noise margin even more, add positive feedback with two resistors as a voltage divider from the output to the noninverting input. 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 MAX9141 includes an internal latch that allows -- storage of comparison results. The LE pin has a high -- input impedance. If LE is high, the latch is transparent (i.e., the comparator operates as though the latch is not present). The comparator's output state is latched -- when LE is pulled low (Figure 2).
MAX9140/MAX9141/MAX9142/MAX9144
VTRIP+ VHYST VIN+ V + VTRIPVOS = TRIP+ 2 VIN- = 0
VTRIP-
VOH COMPARATOR OUTPUT VOL
Figure 1. Input and Output Waveform, Noninverting Input Varied
Input Stage Circuitry
The MAX9140/MAX9141/MAX9142/MAX9144 include internal protection circuitry that prevents damage to the precision input stage from large differential input voltages. This protection circuitry consists of two back-toback diodes between IN+ and IN- as well as two series 4.1k resistors (Figure 3). The diodes limit the differential voltage applied to the internal circuitry of the comparators to be no more than 2VF, where VF is the forward voltage drop of the diode (about 0.7V at +25C). For a large differential input voltage (exceeding 2VF), this protection circuitry increases the input bias current at IN+ (source) and IN- (sink). (IN+ - IN-) - 2VF Input Current = 2 x 4.1k Input current with large differential input voltages should not be confused with input bias current (IB). As long as the differential input voltage is less than 2VF, this input current is equal to IB. The output is in the correct logic state if one or both inputs are within the common-mode range.
Shutdown Mode (MAX9141 Only)
The MAX9141 shuts down when the SHDN pin is low. When shut down, the supply current drops to less than 12A, and the three-state output becomes high imped- ----- -- ance. The S H D N pin has a high-input impedance. ---- --- Connect SHDN to VCC for normal operation. Exit shut-- down with LE high (transparent state); otherwise, the output will be indeterminate.
--- - ----
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7
40ns, Low-Power, 3V/5V, Rail-to-Rail Single-Supply Comparators MAX9140/MAX9141/MAX9142/MAX9144
tS VOD tH
DIFFERENTIAL INPUT VOLTAGE
VOS
tLPW VCC LE VCC 2 0 VOH OUT VCC 2 VOL tPD tLPD
Figure 2. MAX9141 Timing Diagram with Latch Operator
Output Stage Circuitry
The MAX9140/MAX9141/MAX9142/MAX9144 contain a current-driven output stage as shown in Figure 4. During an output transition, ISOURCE or ISINK is pushed or pulled to the output pin. The output source or sink current is high during the transition, creating a rapid slew rate. Once the output voltage reaches V OH or VOL, the source or sink current decreases to a small value, capable of maintaining the VOH or VOL static condition. This significant decrease in current conserves power after an output transition has occurred. One consequence of a current-driven output stage is a linear dependence between the slew rate and the load capacitance. A heavy capacitive load will slow down a voltage output transition. This can be useful in noisesensitive applications where fast edges may cause interference.
MAX9140 MAX9141 MAX9142 MAX9144
4.1k IN+ TO INTERNAL CIRCUITRY
IN- 4.1k
TO INTERNAL CIRCUITRY
Applications Information
Circuit Layout and Bypassing
The high-gain bandwidth of the MAX9140/MAX9141/ MAX9142/MAX9144 requires design precautions to realize the full high-speed capabilities of these comparators. The recommended precautions are: 1) Use a printed circuit board with a good, unbroken, low-inductance ground plane. 2) Place a decoupling capacitor (a 0.1F ceramic capacitor is a good choice) as close to VCC as possible.
Figure 3. Input Stage Circuitry
3) Pay close attention to the decoupling capacitor's bandwidth, keeping leads short. 4) On the inputs and outputs, keep lead lengths short to avoid unwanted parasitic feedback around the comparators. 5) Solder the device directly to the printed circuit board instead of using a socket.
8
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40ns, Low-Power, 3V/5V, Rail-to-Rail Single-Supply Comparators MAX9140/MAX9141/MAX9142/MAX9144
VDD = 3.3V
VCC ISOURCE
MAX9140 MAX9141 MAX9142 MAX9144
VREFC SERIAL DIGITAL INPUT SDI
VDD
8-BIT DAC
MAX512
OUTPUT DACOUTC GND VSS MAX9140
ISINK GND
ANALOG IN
Figure 4. Output Stage Circuitry
Figure 5. 3.3V Digitally Controlled Threshold Detector
Chip Information
VCC = 3V
MAX9140 TRANSISTOR COUNT: 158 MAX9141 TRANSISTOR COUNT: 192 MAX9142 TRANSISTOR COUNT: 314 MAX9144 TRANSISTOR COUNT: 620
10k COAX LINE 20k MAX9140 3V 0 CLEAN DIGITAL SIGNAL
PROCESS: Bipolar
20k
Figure 6. Line Receiver Application
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9
40ns, Low-Power, 3V/5V, Rail-to-Rail Single-Supply Comparators MAX9140/MAX9141/MAX9142/MAX9144
________________________________________________________Package Information
SOT23, 8L.EPS
10
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SOT5L.EPS
40ns, Low-Power, 3V/5V, Rail-to-Rail Single-Supply Comparators MAX9140/MAX9141/MAX9142/MAX9144
___________________________________________Package Information (continued)
SC70, 5L.EPS
______________________________________________________________________________________
TSSOP.EPS
11
40ns, Low-Power, 3V/5V, Rail-to-Rail Single-Supply Comparators MAX9140/MAX9141/MAX9142/MAX9144
___________________________________________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) 2001 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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