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19-1547; Rev 0; 10/99
Low-Cost, Ultra-Small, 3A Single-Supply Comparators
General Description
The MAX9075/MAX9077 single/dual comparators are optimized for +3V and +5V single-supply applications. These comparators have a 580ns propagation delay and consume just 3A per comparator. The combination of low-power, single-supply operation down to +2.1V, and ultra-small footprint makes these devices ideal for all portable applications. The MAX9075/MAX9077 have a common-mode input voltage range of -0.2V to VCC - 1.2V. Unlike many comparators, there is no differential clamp between the inputs, allowing the differential input voltage range to extend Rail-to-Rail(R). All inputs and outputs tolerate a continuous short-circuit fault condition to either rail. The design of the output stage limits supply-current surges while switching (typical of many other comparators), minimizing power consumption under dynamic conditions. Large internal push-pull output drivers allow rail-to-rail output swing with loads up to 2mA, making these devices ideal for interface with TTL/CMOS logic. The MAX9075 single comparator is available in 5-pin SC70 and SOT23-5 packages, while the MAX9077 dual comparator is available in 8-pin SOT23-8 and SO packages.
Features
o 580ns Propagation Delay from Only 3A o +2.1V to +5.5V Single-Supply Operation o Ground-Sensing Inputs o Rail-to-Rail Outputs o No Output Phase Inversion for Overdriven Inputs o No Differential Clamp Across Inputs o Available in Ultra-Small Packages 5-Pin SC70 (MAX9075) 8-Pin SOT23 (MAX9077)
MAX9075/MAX9077
Ordering Information
PART MAX9075EXK-T MAX9075EUK-T MAX9077EKA-T MAX9077ESA TEMP. RANGE -40C to +85C -40C to +85C -40C to +85C -40C to +85C PINPACKAGE 5 SC70-5 5 SOT23-5 8 SOT23-8 8 SO TOP MARK AAC ADLX AAAD --
Applications
Battery-Powered Systems Threshold Detectors/Discriminators Keyless Entry Systems IR Receivers Digital Line Receivers
Typical Operating Circuit
VCC
Pin Configurations
TOP VIEW VIN VCC OUT 1 5 VCC
IN+
MAX9075 MAX9077
OUT
GND 2
MAX9075
IN-
IN+ 3
4
INVREF GND
SC70-5/SOT23-5
Pin Configurations continued at end of data sheet.
________________________________________________________________ Maxim Integrated Products 1
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Low-Cost, Ultra-Small, 3A Single-Supply Comparators MAX9075/MAX9077
ABSOLUTE MAXIMUM RATINGS
Supply Voltage VCC to GND .....................................................................+6V All Other Pins to GND...........................-0.3V to (VCC + 0.3V) Duration of Output Short Circuit to GND or VCC ........Continuous Continuous Power Dissipation (TA = +70C) 5-Pin SC70 (derate 2.5mW/C above +70C) ............200mW 5-Pin SOT23 (derate 7.1mW/C above +70C)..........571mW 8-Pin SOT23 (derate 5.3mW/C above +70C)..........421mW 8-Pin SO (derate 5.88mW/C above +70C)..............471mW Operating Temperature Range ...........................-40C to +85C Storage Temperature Range .............................-65C to +150C Lead Temperature (soldering, 10sec) .............................+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 = -0.2V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.) (Note 1) PARAMETER Operating Supply Voltage Range Supply Current per Comparator Power-Supply Rejection Ratio Common-Mode Voltage Range Input Offset Voltage Input Offset Current Input Bias Current Input Capacitance Common-Mode Rejection Ratio OUT_ Output Voltage High OUT_ Output Voltage Low Propagation Delay Low to High Propagation Delay High to Low Rise/Fall Time SYMBOL VCC ICC PSRR VCMR VOS IOS IB CIN CMRR VOH VOL tPD+ tPD-0.2V VCM (VCC - 1.2V) ISOURCE = 2mA ISINK = 2mA CLOAD = 10pF, overdrive = 100mV CLOAD = 10pF, overdrive = 100mV CLOAD = 10pF 580 250 1.6 60 VCC 0.4 0.4 VCM = 0 (Note 3) CONDITIONS Inferred from PSRR VCC = 5V VCC = 5V VCC = 3V 2.1V VCC 5.5V (Note 2) 54 -0.2 1 1 -5 3 82 -20 TA = +25C TA = TMIN to TMAX 2.4 77 VCC 1.2 8 dB V mV nA nA pF dB V V ns ns ns MIN 2.1 3 TYP MAX 5.5 5.2 6.6 A UNITS V
Note 1: All devices are 100% production tested at TA = +25C. All temperature limits are guaranteed by design. Note 2: Inferred from CMRR. Either input can be driven to the absolute maximum limit without output inversion, as long as the other input is within the input voltage range. Note 3: Guaranteed by design.
2
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Low-Cost, Ultra-Small, 3A Single-Supply Comparators
Typical Operating Characteristics
(VCC = +5V, VCM = 0, 100mV overdrive, TA = +25C, unless otherwise noted.)
MAX9075/MAX9077
OUTPUT VOLTAGE LOW vs. SINK CURRENT (VCC = 2.1V)
MAX9075/7 toc01
OUTPUT VOLTAGE LOW vs. SINK CURRENT (VCC = 3V)
MAX9075/7 toc02
OUTPUT VOLTAGE LOW vs. SINK CURRENT (VCC = 5V)
MAX9075/7 toc03
3.0 2.5 OUTPUT VOLTAGE (V) 2.0 TA = +25C 1.5 1.0 0.5 0 0 5 10 SINK CURRENT (mA) 15 TA = +85C TA = -40C
4.0 3.5 OUTPUT VOLTAGE (V) 3.0 2.5 2.0 1.5 1.0 0.5 0 0 5 10 15 20 25 30 35 TA = +25C
7 6 OUTPUT VOLTAGE (V) 5 4 3 TA = +85C 2 TA = -40C 1 0 TA = +25C
TA = +85C TA = -40C
20
40
0
10
20
SINK CURRENT (mA)
30 40 50 60 70 SINK CURRENT (mA)
80
90
OUTPUT VOLTAGE HIGH vs. SOURCE CURRENT (VCC = 2.1V)
MAX9075/7 toc04
OUTPUT VOLTAGE HIGH vs. SOURCE CURRENT (VCC = 3V)
MAX9075/7 toc05
OUTPUT VOLTAGE HIGH vs. SOURCE CURRENT (VCC = 5V)
5 TA = -40C OUTPUT VOLTAGE (V) 4 3 2 1 0 -1 TA = +85C TA = +25C
MAX9075/7 toc06
2.5 2.0 OUTPUT VOLTAGE (V) 1.5 TA = +85C 1.0 TA = +25C 0.5 0 -0.5 0 2 4 6 8 10 12 14 SOURCE CURRENT (mA) 16
3.5 3.0 OUTPUT VOLTAGE (V) 2.5 2.0 1.5 1.0 0.5 0 -0.5 TA = +85C TA = +25C TA = -40C
6
TA = -40C
18
0
5
10
15 20 25 30 35 SOURCE CURRENT (mA)
40
45
0
10 20 30 40 50 60 70 80 90 100 SOURCE CURRENT (mA)
SHORT-CIRCUIT SINK CURRENT vs. TEMPERATURE
MAX9075 toc07
SHORT-CIRCUIT SOURCE CURRENT vs. TEMPERATURE
MAX9075 toc08
SUPPLY CURRENT vs. TEMPERATURE (OUT = HIGH)
4.0 SUPPLY CURRENT (A) 3.5 3.0 2.5 2.0 1.5 1.0 0.5 VCC = 3V VCC = 2.1V VCC = 5V
MAX9075 toc09
90 80 70 SINK CURRENT (mA) 60 50 40 30 20 10 0 -55 -35 -15 5 25 45 65 VCC = 3V VCC = 2.1V VCC = 5V
100 90 80 SOURCE CURRENT (mA) 70 60 50 40 30 20 10 0 VCC = 2.1V VCC = 3V VCC = 5V
4.5
85
-55
-35
-15
5
25
45
65
85
0 -55 -35 -15 5 25 45 65 85 TEMPERATURE (C)
TEMPERATURE (C)
TEMPERATURE (C)
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3
Low-Cost, Ultra-Small, 3A Single-Supply Comparators MAX9075/MAX9077
Typical Operating Characteristics (continued)
(VCC = +5V, VCM = 0, 100mV overdrive, TA = +25C, unless otherwise noted.)
SUPPLY CURRENT vs. TEMPERATURE (OUT = LOW)
MAX9075 toc10
SUPPLY CURRENT vs. OUTPUT TRANSITION FREQUENCY
MAX9075 toc11
INPUT OFFSET VOLTAGE vs. TEMPERATURE
-0.1 OFFSET VOLTAGE (mV) -0.2 -0.3 -0.4 -0.5 -0.6 VCC = 5V VCC = 3V VCC = 2.1V
MAX9075 toc12
4.0 3.5 SUPPLY CURRENT (A) 3.0 2.5 2.0 1.5 1.0 0.5 0 -55 -35 -15 5 25 45 65 VCC = 2.1V VCC = 5V VCC = 3V
1000
0
SUPPLY CURRENT (A)
100
VCC = 5V
VCC = 3V 10
VCC = 2.1V 1 85 1 10 100 1k 10k 100k 1M TEMPERATURE (C) TRANSITION FREQUENCY (Hz)
-0.7 -0.8 -55 -35 -15 5 25 45 65 85 TEMPERATURE (C)
PROPAGATION DELAY vs. LOAD CAPACITANCE
MAX9075 toc13
PROPAGATION DELAY vs. INPUT OVERDRIVE (tPD+)
MAX9075 toc14
PROPAGATION DELAY vs. INPUT OVERDRIVE (tPD-)
0.6 PROPAGATION DELAY (s) 0.5 0.4 0.3 0.2 0.1 0 VCC = 2.1V VCC = 3V VCC = 5V
MAX9075 toc15
0.7 tPD+ 0.6 PROPAGATION DELAY (s) 0.5 0.4 0.3 0.2 0.1 0 0 500 1000 1500 LOAD CAPACITANCE (pF) tPD-
1.6 1.4 PROPAGATION DELAY (s) 1.2 1.0 0.8 0.6 0.4 0.2 0 0 50 100 150 200 VCC = 5V VCC = 3V VCC = 2.1V
0.7
2000
250
0
50
100
150
200
250
INPUT OVERDRIVE (mV)
INPUT OVERDRIVE (mV)
PROPAGATION DELAY vs. TEMPERATURE (VCC = 2.1V)
MAX9075 toc16
PROPAGATION DELAY vs. TEMPERATURE (VCC = 3V)
MAX9075 toc17
PROPAGATION DELAY vs. TEMPERATURE (VCC = 5V)
700 PROPAGATION DELAY (ns) 600 500 400 300 200 100 0 tPDtPD+
MAX9075 toc18
500 450 PROPAGATION DELAY (ns) 400 350 300 250 200 150 100 50 0 -55 -35 -15 5 25 45 65 tPDtPD+
600 500 PROPAGATION DELAY (ns) 400 300 200 100 0 tPDtPD+
800
85
-55
-35
-15
5
25
45
65
85
-55
-35
-15
5
25
45
65
85
TEMPERATURE (C)
TEMPERATURE (C)
TEMPERATURE (C)
4
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Low-Cost, Ultra-Small, 3A Single-Supply Comparators
Typical Operating Characteristics (continued)
(VCC = +5V, VCM = 0, 100mV overdrive, TA = +25C, unless otherwise noted.)
MAX9075/MAX9077
PROPAGATION DELAY (tPD+)
MAX9075/7 toc19
PROPAGATION DELAY (tPD-)
MAX9075/7 toc20
VCC = 5V 50mV/div
VCC = 5V VIN VIN
50mV/div
VOUT 2V/div 2V/div VOUT
100ns/div
100ns//div
PROPAGATION DELAY (tPD+)
MAX9075/7 toc22
PROPAGATION DELAY (tPD-)
MAX9075/7 toc23
VCC = 3V VIN 50mV/div 50mV/div
VCC = 3V
VIN
1V/div
VOUT
1V/div
VOUT
100ns/div
100ns/div
TRIANGLE WAVE
MAX9075/7 toc21
INPUT BIAS CURRENT vs. TEMPERATURE
VCC = 3V 6 INPUT BIAS CURRENT (nA) VCC = 5V VCC = 3V VCC = 2.1V
MAX9075 toc24
7
50mV/div
5 4 3 2 1 0
VIN
1V/div
VOUT
200s/div
-55
-35
-15
5
25
45
65
85
TEMPERATURE (C)
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5
Low-Cost, Ultra-Small, 3A Single-Supply Comparators MAX9075/MAX9077
Pin Description
PIN MAX9075 SOT23-5 1 -- 2 3 -- 4 -- 5 -- -- -- SC70-5 1 -- 2 3 -- 4 -- 5 -- -- -- MAX9077 SO -- 1 4 -- 3 -- 2 8 5 6 7 SOT23-8 -- 1 2 -- 4 -- 3 8 5 6 7 OUT OUTA GND IN+ INA+ ININAVCC INB+ INBOUTB Comparator Output Output of Comparator A Ground Noninverting Comparator Input Noninverting Input of Comparator A Inverting Comparator Input Inverting Input of Comparator A Positive Supply Voltage Noninverting Input of Comparator B Inverting Input of Comparator B Output of Comparator B NAME FUNCTION
Detailed Description
The MAX9075/MAX9077 feature a 580ns propagation delay from an ultra-low supply current of only 3A per comparator. These devices are capable of single-supply operation in the +2.1V to +5.5V range. Large internal output drivers allow rail-to-rail output swing with up to 2mA loads. Both comparators offer a push-pull output that sinks and sources current.
Applications Information
Adding Hysteresis
Hysteresis extends the comparator's noise margin by increasing the upper threshold and decreasing the lower threshold. A voltage divider from the output of the comparator sets the trip voltage. Therefore, the trip voltage is related to the output voltage. Set the hysteresis with three resistors using positive feedback, as shown in Figure 1. The design procedure is as follows: 1) Choose R3. The leakage current of IN+ may cause a small error; however, the current through R3 can be approximately 500nA and still maintain accuracy. The added supply current due to the circuit at the trip point is VCC/R3; 10M is a good practical value for R3, as this keeps the current well below the supply current of the chip. 2) Choose the hysteresis voltage (VHYS), which is the voltage between the upper and lower thresholds. In this example, choose V HYS = 50mV and assume VREF = 1.2V and VCC = 5V. 3) Calculate R1 as follows: R1 = R3 * VHYS / VCC = 10M * 0.05 / 5 = 100k
Comparator Output
The MAX9075/MAX9077 are designed to maintain a low supply current during repeated transitions by limiting the shoot-through current.
Noise Considerations, Comparator Input
The input common-mode voltage range for these devices extends from -0.2V to VCC - 1.2V. Unlike many other comparators, the MAX9075/MAX9077 can operate at any differential input voltage within these limits. Input bias current is typically -5nA if the input voltage is between the supply rails. Although the comparators have a very high gain, useful gain is limited by noise. The comparator has a wideband peak-to-peak noise of approximately 70V.
6
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Low-Cost, Ultra-Small, 3A Single-Supply Comparators
4) Choose the threshold voltage for VIN rising (VTHR). In this example, choose VTHR = 3V. 5) Calculate R2 as follows: R2 = 1 / {[VTHR / (VREF * R1)] - 1/R1 - 1/R3} = 1 / {[3 / (1.2 * 100k)] - 1/100k - 1/10M} = 67.114k A 1% preferred value is 64.9k. 6) Verify the threshold voltages with these formulas: VIN rising: VTHR = VREF * R1 (1/R1 + 1/R2 + 1/R3) VIN falling: VTHF = VTHR - (R1 * VCC) / R3 7) Check the error due to input bias current (5nA). If the error is too large, reduce R3 and recalculate. VTH = IB (R1 * R2 * R3) / (R1 + R2 + R3) = 0.2mV
Figure 1. Adding Hysteresis
R1 VIN VCC R2 GND VREF OUT
MAX9075/MAX9077
VCC R3
MAX9075 MAX9077
Pin Configurations (cont.)
TOP VIEW
Board Layout and Bypassing
Use 10nF power-supply bypass capacitors. Use 100nF bypass capacitors when supply impedance is high, when supply leads are long, or when excessive noise is expected on the supply lines. Minimize signal trace lengths to reduce stray capacitance. Minimize the capacitive coupling between IN- and OUT. For slowmoving input signals (rise time > 1ms) use a 1nF capacitor between IN+ and IN-.
OUTA 1 GND INA2 3
8
VCC OUTB INBINB+
MAX9077
7 6 5
Chip Information
TRANSISTOR COUNT: 86 (MAX9075) 142 (MAX9077)
INA+ 4
SOT23-8
OUTA 1 INA- 2 INA+ 3
8
VCC OUTB INBINB+
MAX9077
7 6 5
GND 4
SO
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7
Low-Cost, Ultra-Small, 3A Single-Supply Comparators MAX9075/MAX9077
Package Information
SC70, 5L.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.
8 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 (c) 1999 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.
SOT23, 8L.EPS

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