19-1547; Rev 3; 1/07 Low-Cost, Ultra-Small, 3A Single-Supply Comparators Features 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. 580ns Propagation Delay from Only 3A 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. All inputs and outputs tolerate a continuous short-circuit fault condition to either rail. No Differential Clamp Across Inputs 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 packages, while the MAX9077 dual comparator is available in 8-pin SOT23, MAX(R), and SO packages. Applications Battery-Powered Systems Threshold Detectors/Discriminators 2.1V to 5.5V Single-Supply Operation Ground-Sensing Inputs Rail-to-Rail Outputs No Output Phase Inversion for Overdriven Inputs Available in Ultra-Small Packages 5-Pin SC70 (MAX9075) 8-Pin SOT23 (MAX9077) Ordering Information TOP MARK AAC PKG CODE X5-1 MAX9075EXK-T PINPACKAGE 5 SC70-5 MAX9075EUK-T 5 SOT23-5 ADLX U5-1 MAX9077EKA-T 8 SOT23-8 AAAD K8-2 MAX9077EUA 8 MAX -- U8-1 MAX9077ESA 8 SO -- S8-4 PART* *All devices are specified over the -40C to +85C temperature range. Keyless Entry Systems Typical Operating Circuit IR Receivers Digital Line Receivers VCC Pin Configurations TOP VIEW VIN VCC OUT 1 GND 2 5 VCC MAX9075 MAX9077 IN+ MAX9075 OUT IN- IN+ 3 4 INVREF GND SC70-5/SOT23-5 Pin Configurations continued at end of data sheet. MAX is a registered trademark of Maxim Integrated Products, Inc. ________________________________________________________________ Maxim Integrated Products 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. 1 MAX9075/MAX9077 General Description MAX9075/MAX9077 Low-Cost, Ultra-Small, 3A Single-Supply Comparators ABSOLUTE MAXIMUM RATINGS Supply Voltage VCC to GND........................................................................6V All Other Pins to GND...........................-0.3V to (VCC + 0.3V) Current into Input Pins ......................................................20mA 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 MAX (derate 4.5mW/C above +70C) ...........362mW 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, 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 = -0.2V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.) (Note 1) PARAMETER SYMBOL Operating Supply Voltage Range VCC Supply Current per Comparator ICC CONDITIONS VCC = 5V MIN 3 TA = +25C PSRR 2.1V VCC 5.5V Common-Mode Voltage Range VCMR (Note 2) 54 -0.2 VOS 1 IOS 1 Input Capacitance Common-Mode Rejection Ratio OUT_ Output-Voltage High VCM = 0V (Note 3) -5 CIN CMRR -0.2V VCM (VCC - 1.2V) V 5.2 77 Input Offset Current IB UNITS 5.5 A 2.4 Input Offset Voltage Input Bias Current MAX 6.6 TA = TMIN to TMAX VCC = 3V Power-Supply Rejection Ratio TYP 2.1 Inferred from PSRR 60 dB VCC 1.2 V 8 mV nA -20 nA 3 pF 82 dB VCC 0.4 VOH ISOURCE = 2mA OUT_ Output-Voltage Low VOL ISINK = 2mA Propagation Delay Low to High tPD+ CLOAD = 10pF, overdrive = 100mV 580 ns Propagation Delay High to Low tPD- CLOAD = 10pF, overdrive = 100mV 250 ns CLOAD = 10pF 1.6 ns Rise/Fall Time V 0.4 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 _______________________________________________________________________________________ Low-Cost, Ultra-Small, 3A Single-Supply Comparators OUTPUT-VOLTAGE LOW vs. SINK CURRENT (VCC = 2.1V) TA = +85C 1.5 TA = +85C 10 15 5 10 15 20 25 30 35 SINK CURRENT (mA) SINK CURRENT (mA) OUTPUT-VOLTAGE HIGH vs. SOURCE CURRENT (VCC = 2.1V) OUTPUT-VOLTAGE HIGH vs. SOURCE CURRENT (VCC = 3V) 3.0 1.5 TA = +85C 1.0 TA = +25C 0.5 TA = -40C 2.5 40 TA = +85C TA = +25C 1.0 6 8 10 12 14 SOURCE CURRENT (mA) 16 SHORT-CIRCUIT SINK CURRENT vs. TEMPERATURE 80 VCC = 5V 60 50 40 VCC = 3V 30 20 VCC = 2.1V 25 30 35 SOURCE CURRENT (mA) TEMPERATURE (C) 65 40 VCC = 5V 2 TA = +25C 1 0 45 40 85 10 20 30 40 50 60 70 80 90 100 SOURCE CURRENT (mA) SUPPLY CURRENT vs. TEMPERATURE (OUT = HIGH) 50 VCC = 3V 30 20 45 25 60 0 5 20 70 10 -15 15 80 0 -35 10 90 10 -55 5 100 SOURCE CURRENT (mA) SINK CURRENT (mA) 70 TA = +85C 3 SHORT-CIRCUIT SOURCE CURRENT vs. TEMPERATURE MAX9075 toc07 90 4 -1 0 18 4.5 4.0 SUPPLY CURRENT (A) 4 90 0 MAX9075 toc08 2 80 TA = -40C -0.5 0 30 40 50 60 70 SINK CURRENT (mA) 5 0 -0.5 20 6 0.5 0 10 OUTPUT-VOLTAGE HIGH vs. SOURCE CURRENT (VCC = 5V) 2.0 1.5 0 OUTPUT VOLTAGE (V) OUTPUT VOLTAGE (V) TA = -40C MAX9075/7 toc03 TA = -40C MAX9075/7 toc05 2.0 3.5 MAX9075/7 toc04 2.5 TA = +85C 2 0 0 20 TA = +25C 3 MAX9075 toc09 5 4 1 0 0 5 TA = -40C 0.5 0 OUTPUT VOLTAGE (V) TA = +25C 2.0 1.0 TA = -40C 0.5 2.5 MAX9075/7 toc06 TA = +25C 1.5 3.0 6 OUTPUT VOLTAGE (V) 2.0 7 MAX9075/7 toc02 3.5 OUTPUT VOLTAGE (V) 2.5 OUTPUT VOLTAGE (V) 4.0 MAX9075/7 toc01 3.0 1.0 OUTPUT-VOLTAGE LOW vs. SINK CURRENT (VCC = 5V) OUTPUT-VOLTAGE LOW vs. SINK CURRENT (VCC = 3V) 3.5 VCC = 5V 3.0 VCC = 3V 2.5 2.0 VCC = 2.1V 1.5 1.0 VCC = 2.1V 0.5 0 -55 -35 -15 5 25 45 TEMPERATURE (C) 65 85 -55 -35 -15 5 25 45 65 85 TEMPERATURE (C) _______________________________________________________________________________________ 3 MAX9075/MAX9077 Typical Operating Characteristics (VCC = 5V, VCM = 0, 100mV overdrive, TA = +25C, unless otherwise noted.) Typical Operating Characteristics (continued) (VCC = 5V, VCM = 0, 100mV overdrive, TA = +25C, unless otherwise noted.) SUPPLY CURRENT vs. OUTPUT TRANSITION FREQUENCY SUPPLY CURRENT (A) VCC = 5V 2.5 VCC = 3V 2.0 VCC = 2.1V 1.5 100 -0.1 OFFSET VOLTAGE (mV) 3.0 0 MAX9075 toc11 3.5 SUPPLY CURRENT (A) 1000 MAX9075 toc10 4.0 INPUT OFFSET VOLTAGE vs. TEMPERATURE VCC = 5V VCC = 3V 10 1.0 MAX9075 toc12 SUPPLY CURRENT vs. TEMPERATURE (OUT = LOW) -0.2 -0.3 -0.4 VCC = 5V -0.5 VCC = 3V -0.6 VCC = 2.1V 0.5 VCC = 2.1V 0 -15 5 25 45 65 -0.8 1 85 10 100 1k 10k 100k 1M 25 45 65 PROPAGATION DELAY vs. INPUT OVERDRIVE (tPD+) PROPAGATION DELAY vs. INPUT OVERDRIVE (tPD-) 0.1 1.0 0.8 VCC = 5V VCC = 3V 0.6 0.4 PROPAGATION DELAY vs. TEMPERATURE (VCC = 2.1V) tPD- 300 250 200 150 100 150 200 250 25 45 TEMPERATURE (C) 65 85 100 150 200 PROPAGATION DELAY vs. TEMPERATURE (VCC = 5V) 500 tPD+ 400 300 tPD- 200 800 700 tPD+ 600 250 500 400 300 tPD- 200 100 0 5 50 PROPAGATION DELAY vs. TEMPERATURE (VCC = 3V) 100 -15 0 INPUT OVERDRIVE (mV) 50 0 0.2 INPUT OVERDRIVE (mV) 600 PROPAGATION DELAY (ns) 350 100 PROPAGATION DELAY (ns) tPD+ 400 50 MAX9075 toc17 450 MAX9075 toc16 500 VCC = 2.1V VCC = 3V VCC = 5V 0.3 0 0 2000 0.4 0.1 0 500 1000 1500 LOAD CAPACITANCE (pF) 0.5 VCC = 2.1V 0.2 0 MAX9075 toc15 0.6 MAX9075 toc18 0.2 1.2 85 0.7 PROPAGATION DELAY (s) 1.4 PROPAGATION DELAY (s) tPD- 0.3 1.6 MAX9075 toc13 0.4 -35 5 PROPAGATION DELAY vs. LOAD CAPACITANCE 0.5 -55 -15 TEMPERATURE (C) 0.6 0 -35 TRANSITION FREQUENCY (Hz) tPD+ 4 -55 TEMPERATURE (C) MAX9075 toc14 -35 0.7 PROPAGATION DELAY (s) -0.7 1 -55 PROPAGATION DELAY (ns) MAX9075/MAX9077 Low-Cost, Ultra-Small, 3A Single-Supply Comparators 0 -55 -35 -15 5 25 45 TEMPERATURE (C) 65 85 -55 -35 -15 5 25 45 TEMPERATURE (C) _______________________________________________________________________________________ 65 85 Low-Cost, Ultra-Small, 3A Single-Supply Comparators PROPAGATION DELAY (tPD+) PROPAGATION DELAY (tPD-) MAX9075/7 toc20 MAX9075/7 toc19 VCC = 5V VCC = 5V VIN VIN 50mV/div 50mV/div VOUT 2V/div 2V/div VOUT 100ns/div 100ns//div PROPAGATION DELAY (tPD+) PROPAGATION DELAY (tPD-) MAX9075/7 toc21 MAX9075/7 toc22 VCC = 3V VCC = 3V VIN 50mV/div VIN 50mV/div VOUT 1V/div VOUT 1V/div 100ns/div 100ns/div TRIANGLE WAVE INPUT BIAS CURRENT vs. TEMPERATURE MAX9075/7 toc23 MAX9075 toc24 7 VCC = 3V 50mV/div VIN VOUT 1V/div INPUT BIAS CURRENT (nA) 6 VCC = 5V 5 VCC = 3V 4 VCC = 2.1V 3 2 1 0 200s/div -55 -35 -15 5 25 45 65 85 TEMPERATURE (C) _______________________________________________________________________________________ 5 MAX9075/MAX9077 Typical Operating Characteristics (continued) (VCC = 5V, VCM = 0, 100mV overdrive, TA = +25C, unless otherwise noted.) Low-Cost, Ultra-Small, 3A Single-Supply Comparators MAX9075/MAX9077 Pin Description PIN MAX9075 NAME MAX9077 FUNCTION SOT23 SC70 MAX/SO SOT23 1 1 -- -- OUT -- -- 1 1 OUTA Output of Comparator A 2 2 4 2 GND Ground 3 3 -- -- IN+ Noninverting Comparator Input -- -- 3 4 INA+ 4 4 -- -- IN- -- -- 2 3 INA- Inverting Input of Comparator A 5 5 8 8 VCC Positive Supply Voltage -- -- 5 5 INB+ Noninverting Input of Comparator B -- -- 6 6 INB- Inverting Input of Comparator B -- -- 7 7 OUTB 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. 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. Comparator Output Noninverting Input of Comparator A Inverting Comparator Input Output of Comparator B 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 VHYS = 50mV and assume VREF = 1.2V and VCC = 5V. 3) Calculate R1 as follows: R1 = R3 x VHYS / VCC = 10M x 0.05 / 5 = 100k 6 _______________________________________________________________________________________ Low-Cost, Ultra-Small, 3A Single-Supply Comparators R2 = 1 / {[VTHR / (VREF R1)] - 1/R1 - 1/R3} = 1 / {[3 / (1.2 100k)] - 1/100k - 1/10M} = 67.114k VCC R3 R1 VIN VCC A 1% preferred value is 64.9k. 6) Verify the threshold voltages with these formulas: VIN rising: OUT R2 GND MAX9075 MAX9077 VREF 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. Figure 1. Adding Hysteresis Pin Configurations (continued) VTH = IB (R1 R2 R3) / (R1 + R2 + R3) = 0.2mV 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-. Chip Information TOP VIEW OUTA 1 8 VCC 7 OUTB 3 6 INB- INA+ 4 5 INB+ 8 VCC 7 OUTB 3 6 INB- GND 4 5 INB+ GND 2 INA- MAX9075 TRANSISTOR COUNT: 86 MAX9077 TRANSISTOR COUNT: 142 MAX9077 SOT23-8 OUTA 1 INA- 2 INA+ MAX9077 MAX/SO _______________________________________________________________________________________ 7 MAX9075/MAX9077 4) Choose the threshold voltage for VIN rising (VTHR). In this example, choose VTHR = 3V. 5) Calculate R2 as follows: Package Information SC70, 5L.EPS (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information go to www.maxim-ic.com/packages.) PACKAGE OUTLINE, 5L SC70 21-0076 E 1 1 SOT23, 8L .EPS MAX9075/MAX9077 Low-Cost, Ultra-Small, 3A Single-Supply Comparators Revision History Pages changed at Rev 3: 1-4, 6, 8 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) 2007 Maxim Integrated Products is a registered trademark of Maxim Integrated Products, Inc. ENGLISH * ???? * ??? * ??? WHAT'S NEW PRODUCTS SOLUTIONS DESIGN APPNOTES SUPPORT BUY COMPANY MEMBERS MAX9077 Part Number Table Notes: 1. See the MAX9077 QuickView Data Sheet for further information on this product family or download the MAX9077 full data sheet (PDF, 372kB). 2. Other options and links for purchasing parts are listed at: http://www.maxim-ic.com/sales. 3. Didn't Find What You Need? Ask our applications engineers. Expert assistance in finding parts, usually within one business day. 4. Part number suffixes: T or T&R = tape and reel; + = RoHS/lead-free; # = RoHS/lead-exempt. More: See full data sheet or Part Naming C onventions. 5. * Some packages have variations, listed on the drawing. "PkgC ode/Variation" tells which variation the product uses. Part Number Free Sample Buy Direct Package: TYPE PINS SIZE DRAWING CODE/VAR * Temp RoHS/Lead-Free? Materials Analysis MAX9077ESA+ SOIC ;8 pin;.150" Dwg: 21-0041B (PDF) Use pkgcode/variation: S8+4* -40C to +85C RoHS/Lead-Free: Yes Materials Analysis MAX9077ESA SOIC ;8 pin;.150" Dwg: 21-0041B (PDF) Use pkgcode/variation: S8-4* -40C to +85C RoHS/Lead-Free: No Materials Analysis MAX9077ESA-T SOIC ;8 pin;.150" Dwg: 21-0041B (PDF) Use pkgcode/variation: S8-4* -40C to +85C RoHS/Lead-Free: No Materials Analysis MAX9077ESA+T SOIC ;8 pin;.150" Dwg: 21-0041B (PDF) Use pkgcode/variation: S8+4* -40C to +85C RoHS/Lead-Free: Yes Materials Analysis MAX9077EKA+ SOT-23;8 pin; Dwg: 21-0078F (PDF) Use pkgcode/variation: K8+2* -40C to +85C RoHS/Lead-Free: Yes Materials Analysis MAX9077EKA SOT-23;8 pin; Dwg: 21-0078F (PDF) Use pkgcode/variation: K8-2* -40C to +85C RoHS/Lead-Free: No Materials Analysis MAX9077EKA+T SOT-23;8 pin; Dwg: 21-0078F (PDF) Use pkgcode/variation: K8+2* -40C to +85C RoHS/Lead-Free: Yes Materials Analysis MAX9077EKA-T SOT-23;8 pin; Dwg: 21-0078F (PDF) Use pkgcode/variation: K8-2* -40C to +85C RoHS/Lead-Free: No Materials Analysis MAX9077EUA-T uMAX;8 pin;3 x 3mm Dwg: 21-0036J (PDF) Use pkgcode/variation: U8-1* -40C to +85C RoHS/Lead-Free: No Materials Analysis MAX9077EUA uMAX;8 pin;3 x 3mm Dwg: 21-0036J (PDF) Use pkgcode/variation: U8-1* -40C to +85C RoHS/Lead-Free: No Materials Analysis MAX9077EUA+ uMAX;8 pin;3 x 3mm Dwg: 21-0036J (PDF) Use pkgcode/variation: U8+1* -40C to +85C RoHS/Lead-Free: Yes Materials Analysis MAX9077EUA+T uMAX;8 pin;3 x 3mm Dwg: 21-0036J (PDF) Use pkgcode/variation: U8+1* -40C to +85C RoHS/Lead-Free: Yes Materials Analysis Didn't Find What You Need? C ONTAC T US: SEND US AN EMAIL C opyright 2 0 0 7 by M axim I ntegrated P roduc ts , Dallas Semic onduc tor * Legal N otic es * P rivac y P olic y