MAX9647/MAX9648 General-Purpose, Low-Voltage, Tiny Pack Comparators

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1 EVALUATION KIT AVAILABLE MAX9647/MAX9648 General Description 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 oscillatio even with slow moving input signals. 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, respoe time characteristics, input offset, low noise, output saturation voltage, input bias current, and RF immunity. The ICs are available in both 5-pin SC7 and SOT23 packages. Mobile Communicatio Notebooks and PDAs Battery-Powered Electronics General-Purpose Portable Devices Applicatio General-Purpose Low-Voltage Applicatio S Guaranteed +1.8V to +5.5V Performance Ordering Information appears at end of data sheet. Features S -4NC to +125NC Automotive Temperature Range S Low Supply Current (6µA/Channel at VDD = +5.V) S Input Common-Mode Voltage Range Includes Ground S No Phase Reversal for Overdriven Inputs S Low Output Saturation Voltage (12mV) S Internal 2mV Hysteresis (MAX9648) S 5-Pin SC7 Space-Saving Package (2.mm x 2.1mm x 1.mm) For pricing, delivery, and ordering information, please contact Maxim Direct at , or visit Maxim s website at ; Rev 3; 4/15

2 ABSOLUTE MAXIMUM RATINGS Supply Voltage (V DD to V SS )...-.3V to +6V All Other Pi Except OUT... (V SS -.3V) to (V DD +.3V) Differential Input Voltage (IN+ to IN-)... ±3.6V OUT... (V SS - 3V) to +6V Continuous Power Dissipation (T A = +7NC) SC7 (derate 3.1mW/NC above +7NC)...247mW MAX9647/MAX9648 SOT23 (derate 3.9mW/NC above +7NC) mW Operating Temperature Range... -4NC to +125NC Junction Temperature...+15NC Storage Temperature Range NC to +15NC Lead Temperature (soldering, 1s)...+3NC Soldering Temperature (reflow)...+26nc 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 conditio beyond those indicated in the operational sectio of the specificatio is not implied. Exposure to absolute maximum rating conditio for extended periods may affect device reliability. PACKAGE THERMAL CHARACTERISTICS (Note 1) SC7 Junction-to-Ambient Thermal Resistance (Θ JA ) C/W Junction-to-Case Thermal Resistance (Θ JC ) C/W SOT23 Junction-to-Ambient Thermal Resistance (Θ JA ) C/W Junction-to-Case Thermal Resistance (Θ JC )...81 C/W Note 1: Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-layer board. For detailed information on package thermal coideratio, refer to DC ELECTRICAL CHARACTERISTICS 2.7V OPERATION (V DD = 2.7V, V SS = V, V CM = V, R L = 5.1kI connected to V DD, typical values are at T A = +25NC, unless otherwise noted. Boldface Input Offset Voltage V OS.4 7 mv Input Voltage Hysteresis V HYST MAX9648 only 2 mv Input Offset Voltage Average Temperature Drift TCV OS 1.5 FV/NC Input Bias Current I B T A = -4NC to +85NC ±4 T A = +25NC Q.3 Q25 T A = -4NC to +125NC ±4 Input Offset Current I OS T A = -4NC to +85NC ±15 T A = +25NC Q.3 Q5 T A = -4NC to +125NC ±15 Input Voltage Range V CM -.1 Voltage Gain A V MAX9647 only 5 V/mV Output Saturation Voltage V SAT I SINK P 1mA 25 mv Output Sink Current I O V O P 1.5V 5 16 ma Supply Current I S (Note 3) 52 1 FA Output Leakage Current 2. T A = +25NC.5 T A = -4NC to +85NC 1 T A = -4NC to +125NC 2 na na V FA 2

3 AC ELECTRICAL CHARACTERISTICS 2.7V OPERATION (V DD = 2.7V, V SS = V, V CM = V, R L = 5.1kI connected to V DD, typical values are at T A = +25NC, unless otherwise noted. Boldface High to Low (Note 4) Low to High (Note 4) Input overdrive = 1mV 7 t PHL Input overdrive = 1mV 5 Input overdrive = 1mV 115 t PLH Input overdrive = 1mV 1 DC ELECTRICAL CHARACTERISTICS 5.V OPERATION (V DD = 5V, V SS = V, V CM = V, R L = 5.1kI connected to V DD, typical values are at T A = +25NC, unless otherwise noted. Boldface Input Offset Voltage V OS T A = -4NC to +85NC 9 T A = +25NC.4 7 T A = -4NC to +125NC 9 Input Voltage Hysteresis MAX9648 only 2 mv Input Offset Voltage Average TCV Temperature Drift OS 1.5 FV/NC Input Bias Current I B T A = -4NC to +85NC ±4 T A = +25NC Q.7 Q25 T A = -4NC to +125NC ±4 Input Offset Current I OS T A = -4NC to +85NC ±15 T A = +25NC Q.7 Q5 T A = -4NC to +125NC ±15 Input Voltage Range V CM -.1 Voltage Gain A V MAX9647 only 2 5 V/mV Output Saturation Voltage V SAT I SINK P 4mA 4.2 T A = +25NC 12 4 T A = -4NC to +85NC 7 T A = -4NC to +125NC 7 Output Sink Current I O V O P 1.5V 1 35 ma Supply Current (Note 3) I S T A = -4NC to +85NC 15 T A = +25NC 6 12 Output Leakage Current T A = -4NC to +125NC 17 T A = +25NC.5 T A = -4NC to +85NC 1 T A = -4NC to +125NC 2 mv na na V mv FA FA 3

4 AC ELECTRICAL CHARACTERISTICS 5.V OPERATION (V DD = 5V, V SS = V, V CM = V, R L = 5.1kI connected to V DD, typical values are at T A = +25NC, unless otherwise noted. Boldface High to Low (Note 4) Low to High (Note 4) Input overdrive = 1mV 7 t PHL Input overdrive = 1mV 5 Input overdrive = 1mV 11 t PLH Input overdrive = 1mV 1 DC ELECTRICAL CHARACTERISTICS 1.8V OPERATION (V DD = 1.8V, V SS = V, V CM = V, R L = 5.1kI connected to V DD, typical values are at T A = +25NC, unless otherwise noted. Boldface Input Offset Voltage V OS.4 5 mv Input Voltage Hysteresis MAX9648 only 2 mv Input Offset Voltage Average Temperature Drift TCV OS 1.5 FV/NC Input Bias Current I B.3 na Input Offset Current I OS.3 na Input Voltage Range V CM -.1 Output Saturation Voltage V SAT I SINK P 1mA 56 mv Power-Supply Rejection Ratio PSRR V DD = 1.8V to 5.5V 6 9 db Output Sink Current I O V O P 1.5V 6.4 ma Supply Current I S (Note 3) 5 1 FA Output Leakage Current.1 FA 1 V AC ELECTRICAL CHARACTERISTICS 1.8V OPERATION (V DD = 1.8V, V SS = V, V CM = V, R L = 5.1kI connected to V DD, typical values are at T A = +25NC, unless otherwise noted. Boldface High to Low (Note 4) Low to High (Note 4) Input overdrive = 1mV 7 t PHL Input overdrive = 1mV 6 Input overdrive = 1mV 12 t PLH Input overdrive = 1mV 11 Note 2: All devices are production tested at T A = +25NC. All temperature limits are guaranteed by design. Note 3: Supply current when output is high. Note 4: Input overdrive is the overdrive voltage beyond the offset and hysteresis-determined trip points. 4

5 Typical Operating Characteristics (V DD = 5V, V SS = V, V CM = V, R L = 5.1kI, C L = 1pF, overdrive = 1mV, T A = +25NC, unless otherwise noted.) SUPPLY CURRENT (µa) SUPPLY CURRENT (µa) INPUT BIAS CURRENT (na) SUPPLY CURRENT vs. SUPPLY VOLTAGE T A = +125 C T A = +25 C T A = +85 C 1 = HIGH SUPPLY VOLTAGE (V) T A = -4 C SUPPLY CURRENT vs. FREQUENCY (V OVERDRIVE = 1mV) V DD = 5V V DD = 2.7V V DD = 1.8V k 1k 1k 1M INPUT FREQUENCY (Hz) INPUT BIAS CURRENT vs. TEMPERATURE V DD = 1.8V V DD = 2.7V V DD = 5V MAX9647 toc1 MAX9647 toc3 MAX9647 toc5 SUPPLY CURRENT (µa) INPUT OFFSET VOLTAGE (mv) OUTPUT VOLTAGE LOW (mv) SUPPLY CURRENT vs. SUPPLY VOLTAGE T A = +125 C T A = +85 C T A = +25 C 1 = LOW SUPPLY VOLTAGE (V) T A = -4 C INPUT OFFSET VOLTAGE vs. TEMPERATURE V DD = 5V V DD = 2.7V V DD = 1.8V TEMPERATURE ( C) OUTPUT VOLTAGE LOW vs. PULLUP RESISTOR V OL - V EE MAX9647 toc2 MAX9647 toc4 MAX9647 toc TEMPERATURE ( C) 1 1k 1k 1k PULLUP RESISTANCE (I) 5

6 Typical Operating Characteristics (continued) (V DD = 5V, V SS = V, V CM = V, R L = 5.1kI, C L = 1pF, overdrive = 1mV, T A = +25NC, unless otherwise noted.) PROPAGATION DELAY vs. CAPACITIVE LOAD (V OVERDRIVE = 1mV) 6 5 MAX9647 toc PROPAGATION DELAY vs. TEMPERATURE (V OVERDRIVE = 1mV) MAX9647 toc8 PROPAGATION DELAY () t PLH t PHL PROPIGATION DELAY () t PLH t PHL 1 2 PROPAGATION DELAY () CAPACITIVE LOAD (pf) PROPAGATION DELAY vs. INPUT OVERDRIVE (t PLH ) T A = +125 C T A = +4 C T A = +85 C INPUT OVERDRIVE VOLTAGE (mv) T A = +25 C MAX9647 toc9 PROPAGATION DELAY () TEMPERATURE ( C) PROPAGATION DELAY vs. INPUT OVERDRIVE (t PHL ) T A = -4 C T A = +25 C T A = +125 C INPUT OVERDRIVE VOLTAGE (mv) T A = +85 C MAX9647 toc1 INPUT HYSTERESIS VOLTAGE (mv) INPUT HYSTERESIS VOLTAGE vs. TEMPERATURE V DD = 1.8V V DD = 5V V DD = 2.7V MAX9647 toc11 PROPAGATION DELAY 1mV OVERDRIVE MAX9647 toc TEMPERATURE ( C) 1/div 6

7 Typical Operating Characteristics (continued) (V DD = 5V, V SS = V, V CM = V, R L = 5.1kI, C L = 1pF, overdrive = 1mV, T A = +25NC, unless otherwise noted.) PROPAGATION DELAY 1mV OVERDRIVE MAX9647 toc13 5kHz RESPONSE 1mV OVERDRIVE MAX9647 toc14 1/div 4/div 5kHz RESPONSE 1mV OVERDRIVE MAX9647 toc15 1kHz RESPONSE 1mV OVERDRIVE MAX9647 toc16 4/div 2µs/div 1kHz RESPONSE 1mV OVERDRIVE MAX9647 toc17 POWER-UP RESPONSE MAX9647 toc18 + 2mV/div V DD 2V/div 2V/div 2µs/div 4µs/div 7

8 Pin Configuration TOP VIEW IN+ 1 + MAX9647 MAX V DD V SS 2 IN- 3 4 OUT SC7/SOT23 Pin Description PIN NAME FUNCTION 1 IN+ Noninverting Input 2 V SS Negative Supply (Connect to GND) 3 IN- Inverting Input 4 OUT Comparator Output (Open Drain) 5 V DD Positive Supply Detailed Description 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 -.1V below the negative supply to within +.7V of the positive supply. They require approximately 6FA per comparator with a 5V supply and 52FA with a 2.7V supply. The MAX9648 has 2mV of hysteresis for noise immunity. This significantly reduces the chance of output oscillatio even with slow-moving input signals. See the Typical Operating Characteristics. Applicatio 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 MAX9648 has 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 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 traitio for noisy, slow-moving input signals. 8

9 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: (HIGH) = V DD - I LOAD x R L 2) Find the trip points of the comparator using these formulas: V TH = V REF + (((HIGH) - V REF )R2)/(R1 + R2) V TL = V REF (1 - (R2/(R1 + R2))) where V TH is the threshold voltage at which the comparator switches its output from high to low as rises above the trip point, and V TL is the threshold voltage at which the comparator switches its output from low to high as drops below the trip point. 3) The hysteresis band is: V HYST = V TH - V TL = V DD (R2/(R1 + R2)) In this example, let V DD = 5V, V REF = 2.5V, I LOAD = 5nA, and R L = 5.1kΩ. (HIGH) = 5.V - (5 x 1-9 x 5.1 x 1 3 I) 5.V V TH = (R2/(R1 + R2)) V TL = 2.5(1 - (R2/(R1 + R2))) Select R2. In this example, choose 1kΩ. Select V HYST. In this example, choose 5mV. Solve for R1. V HYST = (HIGH) (R2/(R1 + R2))V.5V = 5(1/(R1 + 1))V where R1 1kΩ, V TH = 2.525V, and V TL = 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 V REF /(R1 + R2). The sink current is ((HIGH) - V REF ) x (R1 + R2). Choose R L to be large enough to avoid drawing excess current, yet small enough to supply the necessary current to drive the load. R L should be between 1kI and 1kΩ. Choose R1 to be much larger than R L to avoid lowering (HIGH) ir raising (LOW). Board Layout and Bypassing Use.1FF bypass capacitors from V DD to V SS. To maximize performance, minimize stray inductance by putting this capacitor close to the V DD 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. IN+ THRESHOLDS R1 V DD R L IN- V HYST HYSTERESIS BAND V TH V TL V REF R2 IN+ V DD OUT IN- MAX9647 OUT V SS Figure 1. Threshold Hysteresis Band (Not to Scale) Figure 2. Adding Hysteresis with External Resistors 9

10 PROCESS: BiCMOS Chip Information Ordering Information Package Information For the latest package outline information and land patter (footprints), go to Note that a +, #, or - in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertai to the package regardless of RoHS status. PART MAX9647AXK+T TEMP RANGE -4NC to +125NC PIN- PACKAGE TOP MARK 5 SC7 +AUS PACKAGE TYPE PACKAGE CODE OUTLINE NO. LAND PATTERN NO. 5 SC7 X SOT23 U MAX9647AUK+T -4NC to +125NC 5 SOT23 +AFLM MAX9648AXK+T -4NC to +125NC 5 SC7 +AUT MAX9648AUK+T -4NC to +125NC 5 SOT23 +AFLN +Denotes a lead(pb)-free/rohs-compliant package. T = Tape and reel. 1

11 Revision History REVISION NUMBER REVISION DATE DESCRIPTION PAGES CHANGED 1/11 Initial release 1 1/12 Revised the Typical Operating Characteristics /13 3 4/15 Updated the Absolute Maximum Ratings, added the Package Thermal Characteristics, and revised the Electrical Characteristics. No /V OPNs; deleted Automotive Applicatio from Applicatio section and automotive reference from Detailed Description section 2 4 1, 8 cannot assume respoibility for use of any circuitry other than circuitry entirely embodied in a product. No circuit patent licees are implied. reserves the right to change the circuitry and specificatio 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. 16 Rio Robles, San Jose, CA USA and the logo are trademarks of Products, Inc.