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????????????????????????????????????????????????????????????????? maxim integrated products 1 19-5968; rev 1; 1/12 ordering information appears at end of data sheet. for related parts and recommended products to use with this part, refer to www.maxim-ic.com/max9647.related . general description the max9647/max9648 comparators are drop-in, pin-for- pin compatible replacements for the lmx331/lmx331h. the max9648 has the added benefit of internal hyster - esis to provide noise immunity, preventing output oscilla - tions 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, com - petitive cmrr and psrr, response time characteristics, input offset, low noise, output saturation voltage, input bias current, and rf immunity. the ics are available in both 5-pin sc70 and sot23 packages. applications mobile communications notebooks and pdas automotive applications battery-powered electronics general-purpose portable devices general-purpose low-voltage applications features s guaranteed +1.8v to +5.5v performance s -40 n c to +125 n c automotive temperature range s low supply current (60a/channel at v dd = +5.0v) s input common-mode voltage range includes ground s no phase reversal for overdriven inputs s low output saturation voltage (120mv) s internal 2mv hysteresis (max9648) s 5-pin sc70 space-saving package (2.0mm x 2.1mm x 1.0mm) max9647/max9648 general-purpose, low-voltage, tiny pack comparators evaluation kit available for pricing, delivery, and ordering information, please contact maxim direct at 1-888-629-4642, or visit maxims website at www.maxim-ic.com.
????????????????????????????????????????????????????????????????? maxim integrated products 2 max9647/max9648 general-purpose, low-voltage, tiny pack comparators supply voltage (v dd to v ss ) ................................... -0.3v to +6v all other pins ................................. (v ss - 0.3v) to (v dd + 0.3v) continuous power dissipation (t a = +70 n c) sc70 (derate 3.1 mw/ n c above +70 n c) ...................... 247mw sot23 (derate 7.1 mw/ n c above +70 n c) ................... 571mw operating temperature range ........................ -40 n c to +125 n c junction temperature ..................................................... +150 n c storage temperature range ............................ -65 n c to +150 n c lead temperature (soldering, 10s) ................................ +300 n c soldering temperature (reflow) ...................................... +260 n c absolute maximum ratings stresses beyond those listed under absolute maximum ratings may cause permanent damage to the device. these are stress ratings only, and functional opera - tion 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 characteristics2.7v operation (v dd = 2.7v, v ss = 0v, v cm = 0v, r l = 5.1k i connected to v dd , typical values are at t a = +25 n c, unless otherwise noted. boldface limits apply at the defined temperature extremes.) (note 1) ac electrical characteristics2.7v operation (v dd = 2.7v, v ss = 0v, v cm = 0v, r l = 5.1k i connected to v dd , typical values are at t a = +25 n c, unless otherwise noted. boldface limits apply at the defined temperature extremes.) (note 1) parameter symbol conditions min typ max units input offset voltage v os 0.4 7 mv input voltage hysteresis v hyst max9648 only 2 mv input offset voltage average temperature drift tcv os 1.5 f v/ n c input bias current i b t a = +25 n c q 0.0003 q 250 na t a = -40 n c to +85 n c 400 t a = -40 n c to +125 n c 400 input offset current i os t a = +25 n c q 0.0003 q 50 na t a = -40 n c to +85 n c 150 t a = -40 n c to +125 n c 150 input voltage range v cm -0.1 v 2.0 voltage gain a v max9647 only 500 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 2) 52 100 f a output leakage current t a = +25 n c 0.005 f a t a = -40 n c to +85 n c 1 t a = -40 n c to +125 n c 2 parameter symbol conditions min typ max units propagation delay output high to low (note 3) t phl input overdrive = 10mv 70 ns input overdrive = 100mv 50 propagation delay output low to high (note 3) t plh input overdrive = 10mv 115 ns input overdrive = 100mv 100
????????????????????????????????????????????????????????????????? maxim integrated products 3 max9647/max9648 general-purpose, low-voltage, tiny pack comparators dc electrical characteristicsC5.0v operation (v dd = 5v, v ss = 0v, v cm = 0v, r l = 5.1k i connected to v dd , typical values are at t a = +25 n c, unless otherwise noted. boldface limits apply at the defined temperature extremes.) (note 1) ac electrical characteristicsC5.0v operation (v dd = 5v, v ss = 0v, v cm = 0v, r l = 5.1k i connected to v dd , typical values are at t a = +25 n c, unless otherwise noted. boldface limits apply at the defined temperature extremes.) (note 1) parameter symbol conditions min typ max units input offset voltage v os t a = +25 n c 0.4 7 mv t a = -40 n c to +85 n c 9 t a = -40 n c to +125 n c 9 input voltage hysteresis max9648 only 2 mv input offset voltage average temperature drift tcv os 1.5 f v/ n c input bias current i b t a = +25 n c q 0.007 q 250 na t a = -40 n c to +85 n c 400 t a = -40 n c to +125 n c 400 input offset current i os t a = +25 n c q 0.007 q 50 na t a = -40 n c to +85 n c 150 t a = -40 n c to +125 n c 150 input voltage range v cm -0.1 v 4.2 voltage gain a v max9647 only 20 500 v/mv output saturation voltage v sat i sink p 4ma t a = +25 n c 120 400 mv t a = -40 n c to +85 n c 700 t a = -40 n c to +125 n c 700 output sink current i o v o p 1.5v 10 35 ma supply current (note 2) i s t a = +25 n c 60 120 f a t a = -40 n c to +85 n c 150 t a = -40 n c to +125 n c 170 output leakage current t a = +25 n c 0.005 f a t a = -40 n c to +85 n c 1 t a = -40 n c to +125 n c 2 parameter symbol conditions min typ max units propagation delay output high to low (note 3) t phl input overdrive = 10mv 70 ns input overdrive = 100mv 50 propagation delay output low to high (note 3) t plh input overdrive = 10mv 110 ns input overdrive = 100mv 100
????????????????????????????????????????????????????????????????? maxim integrated products 4 max9647/max9648 general-purpose, low-voltage, tiny pack comparators dc electrical characteristics1.8v operation (v dd = 1.8v, v ss = 0v, v cm = 0v, r l = 5.1k i connected to v dd , typical values are at t a = +25 n c, unless otherwise noted. boldface limits apply at the defined temperature extremes.) (note 1) ac electrical characteristics1.8v operation (v dd = 1.8v, v ss = 0v, v cm = 0v, r l = 5.1k i connected to v dd , typical values are at t a = +25 n c, unless otherwise noted. boldface limits apply at the defined temperature extremes.) (note 1) note 1: all devices are production tested at t a = +25 n c. 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. parameter symbol conditions min typ max units input offset voltage v os 0.4 5 mv input voltage hysteresis max9648 only 2 mv input offset voltage average temperature drift tcv os 1.5 f v/ n c input bias current i b 0.0003 na input offset current i os 0.0003 na input voltage range v cm -0.1 v 1 output saturation voltage v sat i sink p 1ma 56 mv power-supply rejection ratio psrr v dd = 1.8v to 5.5v 60 90 db output sink current i o v o p 1.5v 6.4 ma supply current i s (note 2) 50 100 f a output leakage current 0.001 f a parameter symbol conditions min typ max units propagation delay output high to low (note 3) t phl input overdrive = 10mv 70 ns input overdrive = 100mv 60 propagation delay output low to high (note 3) t plh input overdrive = 10mv 120 ns input overdrive = 100mv 110
????????????????????????????????????????????????????????????????? maxim integrated products 5 typical operating characteristics (v dd = 5v, v ss = 0v, v cm = 0v, r l = 5.1k i , c l = 10pf, overdrive = 100mv, t a = +25 n c, unless otherwise noted.) supply current vs. supply voltage max9647 toc01 supply voltage (v) supply current (a) 5.5 5.0 4.0 4.5 2.0 2.5 3.0 3.5 1.5 10 20 30 40 50 60 70 80 90 0 1.0 6.0 t a = +85c t a = -40c t a = +25c t a = +125c v out = high supply current vs. frequency (v overdrive = 10mv) max9647 toc03 input frequency (hz) supply current (a) 100k 10k 1k 100 10 100 200 300 400 500 600 700 800 900 0 11 m v dd = 1.8v v dd = 2.7v v dd = 5v input bias current vs. temperature max9647 toc05 temperature (c) input bias current (na) 100 75 50 25 0 -25 0.1 0.2 0.3 0.4 0.5 0.6 0 -50 125 v dd = 2.7v v dd = 1.8v v dd = 5v supply current vs. supply voltage max9647 toc02 supply voltage (v) supply current (a) 5 4 3 2 10 20 30 40 50 60 70 0 16 t a = +125c t a = -40c v out = low t a = +25c t a = +85c input offset voltage vs. temperature max9647 toc04 temperature (c) input offset voltage (mv) 100 75 50 25 0 -25 0.2 0.4 0.6 0.8 1.0 1.2 0 -50 125 v dd = 1.8v v dd = 2.7v v dd = 5v pullup resistance ( i) output voltage low (mv) 10k 1k 100 100k output voltage low vs. pullup resistor max9647 toc06 50 100 150 200 250 v ol - v ee 300 0 max9647/max9648 general-purpose, low-voltage, tiny pack comparators
????????????????????????????????????????????????????????????????? maxim integrated products 6 typical operating characteristics (continued) (v dd = 5v, v ss = 0v, v cm = 0v, r l = 5.1k i , c l = 10pf, overdrive = 100mv, t a = +25 n c, unless otherwise noted.) capacitive load (pf) propagation delay (ns) 80 60 40 20 100 200 300 400 500 600 0 0 100 propagation delay vs. capacitive load (v overdrive = 100mv) max9647 toc07 t plh t phl propagation delay vs. input overdrive (t plh ) max9647 toc09 input overdrive voltage (mv) propagation delay (ns) 100 50 60 70 80 90 100 110 120 130 140 40 10 1000 t a = +125c t a = +85c t a = +25c t a = +40c input hysteresis voltage vs. temperature max9647 toc11 temperature (c) input hysteresis voltage (mv) 100 75 50 25 0 -25 0.5 1.0 1.5 2.0 2.5 3.0 0 -50 125 v dd = 2.7v v dd = 5v v dd = 1.8v propagation delay vs. temperature (v overdrive = 100mv) max9647 toc08 temperature (c) propigation delay (ns) 100 75 50 25 0 -25 20 40 60 80 100 120 0 -50 125 t plh t phl propagation delay vs. input overdrive (t phl ) max9647 toc10 input overdrive voltage (mv) propagation delay (ns) 100 35 40 45 50 55 60 65 70 75 80 30 10 1000 t a = +25c t a = -40c t a = +85c t a = +125c propagation delay 100mv overdrive max9647 toc12 v in v out 100ns /div max9647/max9648 general-purpose, low-voltage, tiny pack comparators
????????????????????????????????????????????????????????????????? maxim integrated products 7 typical operating characteristics (continued) (v dd = 5v, v ss = 0v, v cm = 0v, r l = 5.1k i , c l = 10pf, overdrive = 100mv, t a = +25 n c, unless otherwise noted.) propagation delay 10mv overdrive max9647 toc13 v in v out 100ns /div 500khz response 10mv overdrive max9647 toc15 v in v out 400ns /div 100khz response 10mv overdrive max9647 toc17 v in v out 2s/div 500khz response 100mv overdrive max9647 toc14 v in v out 400ns /div 100khz response 100mv overdrive max9647 toc16 v in v out 2s /div power-up response max9647 toc18 v in+ 200mv/div v out 2v/div v dd 2v/div 4s/div max9647/max9648 general-purpose, low-voltage, tiny pack comparators
????????????????????????????????????????????????????????????????? maxim integrated products 8 max9647/max9648 general-purpose, low-voltage, tiny pack comparators pin description pin configuration 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 -0.1v below the negative supply to within +0.7v of the positive supply. they require approximately 60 f a per comparator with a 5v supply and 52 f a with a 2.7v supply. the max9648 has 2mv of hysteresis for noise immunity. this significantly reduces the chance of output oscilla - tions even with slow moving input signals. the ics are ideal for automotive applications because they oper - ate from -40 n c to +125 n c. see the typical operating characteristics . applications information hysteresis many comparators oscillate in the linear region of opera - tion 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 comparators 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. 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 max9647 max9648 sc70 /sot23 top view v ss in- 1 in+ 2 3 out 5v dd 4 +
????????????????????????????????????????????????????????????????? maxim integrated products 9 max9647/max9648 general-purpose, low-voltage, tiny pack comparators additional hysteresis can be generated with two resis - tors using positive feedback ( figure 2 ). use the following procedure to calculate resistor values: 1) find output voltage when output is high: v out(high) = v dd - i load x r l 2) find the trip points of the comparator using these formulas: v th = v ref + ((v out(high) - v ref )r2)/(r1 + r2) v tl = v ref (1 - (r2/(r1 + r2))) where v th is the threshold voltage at which the compara - tor switches its output from high to low as v in rises above the trip point, and v tl is the threshold voltage at which the comparator switches its output from low to high as v in 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 = 50na, and r l = 5.1k i . v out(high) = 5.0v - (50 x 10 -9 x 5.1 x 10 3 i ) 5.0v v th = 2.5 + 2.5(r2/(r1 + r2)) v tl = 2.5(1 - (r2/(r1 + r2))) select r2. in this example, choose 1k i . select v hyst . in this example, choose 50mv. solve for r1. v hyst = v out(high) (r2/(r1 + r2))v 0.050v = 5(1000/(r1 + 1000))v where r1 100k i , 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 (v out(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 cur - rent to drive the load. r l should be between 1k i and 10k i . choose r1 to be much larger than r l to avoid lowering v out(high) ir raising v out(low) . board layout and bypassing use 0.1 f f bypass capacitors from v dd to v ss . to maxi - mize 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. figure 1. threshold hysteresis band (not to scale) figure 2. adding hysteresis with external resistors in+ thresholds in- v hyst v tl v th hysteresis band out in+ out r l r1 r2 v ref v in v dd v out v dd v ss in- max9647
???????????????????????????????????????????????????????????????? maxim integrated products 10 max9647/max9648 general-purpose, low-voltage, tiny pack comparators ordering information + denotes a lead(pb)-free/rohs-compliant package. t = tape and reel. chip information process: bicmos package information for the latest package outline information and land patterns (footprints), go to www.maxim-ic.com/packages . note that a +, #, or - in the package code indicates rohs status only. package drawings may show a different suffix character, but the drawing pertains to the package regardless of rohs status. part temp range pin- package top mark max9647 axk+t -40 n c to +125 n c 5 sc70 +aus max9647auk+t -40 n c to +125 n c 5 sot23 +aflm max9648 axk+t -40 n c to +125 n c 5 sc70 +aut max9648auk+t -40 n c to +125 n c 5 sot23 +afln package type package code outline no. land pattern no. 5 sc70 x5+1 21-0076 90-0188 5 sot23 u5+1 21-0057 90-0174
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. 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. maxim integrated products, 120 san gabriel drive, sunnyvale, ca 94086 408-737-7600 11 ? 2012 maxim integrated products maxim is a registered trademark of maxim integrated products, inc. revision history revision number revision date description pages changed 0 10/11 initial release 1 1/12 revised the typical operating characteristics . 6 max9647/max9648 general-purpose, low-voltage, tiny pack comparators

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