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general description the max9025?ax9028 nanopower comparators in space-saving chip-scale (ucsp) packages feature beyond-the-rails inputs and are guaranteed to oper- ate down to +1.8v. the max9025/max9026 feature an on-board 1.236v ?% reference and draw an ultra-low supply current of only 1?, while the max9027/ max9028 (without reference) require just 0.6? of supply current. these features make the max9025?ax9028 family of comparators ideal for all 2-cell battery- monitoring/management applications. the unique design of the output stage limits supply- current surges while switching, virtually eliminating the supply glitches typical of many other comparators. this design also minimizes overall power consumption under dynamic conditions. the max9025/max9027 have a push-pull output stage that sinks and sources current. large internal-output drivers allow rail-to-rail output swing with loads up to 5ma. the max9026/max9028 have an open-drain output stage that makes them suit- able for mixed-voltage system design. all devices are available in the miniature 6-bump ucsp packages. refer to the max9117 data sheet for similar comparators in 5-pin sc70 packages and the max9017 data sheet for similar dual comparators in 8-pin sot23 packages. applications 2-cell battery monitoring/management ultra-low-power systems mobile communications notebooks and pdas sensing at ground or supply line telemetry and remote systems medical instruments features ? space-saving ucsp package (1mm x 1.52mm) ? ultra-low supply current 0.6a (max9027/max9028) 1a with reference (max9025/max9026) ? guaranteed to operate down to +1.8v ? internal 1.236v 1% reference (max9025/max9026) ? input voltage range extends 200mv beyond-the-rails ? cmos push-pull output with 5ma drive capability (max9025/max9027) ? open-drain output versions available (max9026/max9028) ? crowbar-current-free switching ? internal hysteresis for clean switching ? no phase reversal for overdriven inputs max9025?ax9028 ucsp, 1.8v, nanopower, beyond-the-rails comparators with/without reference ________________________________________________________________ maxim integrated products 1 top view (bumps on bottom) ucsp max9025 max9028 1 2 3 v cc a b out v ee in+ ref (v ee ) in- ( ) max9027/max9028 pins typical application circuit appears at end of data sheet. pin configurations selector guide ordering information beyond-the-rails and ucsp are trademarks of maxim integrated products, inc. 19-3241; rev 0; 5/04 part temp range bump- package top mark max9025 ebt-t -40? to +85? 6 ucsp-6 adb max9026 ebt-t -40? to +85? 6 ucsp-6 adc max9027 ebt-t -40? to +85? 6 ucsp-6 add max9028 ebt-t -40? to +85? 6 ucsp-6 ade for pricing, delivery, and ordering information, please contact maxim/dallas direct! at 1-888-629-4642, or visit maxim? website at www.maxim-ic.com. part internal reference output type supply current (a) max9025 yes push-pull 1.0 max9026 yes open-drain 1.0 max9027 no push-pull 0.6 max9028 no open-drain 0.6
max9025?ax9028 ucsp, 1.8v, nanopower, beyond-the-rails comparators with/without reference 2 _______________________________________________________________________________________ absolute maximum ratings electrical characteristics?max9025/max9026 (with ref) (v cc = +5v, v ee = 0v, v in+ = v ref , t a = -40? to +85?, unless otherwise noted. typical values are at t a = +25?.) (note 1) stresses beyond those listed under ?bsolute maximum ratings?may cause permanent damage to the device. these are stress rating s only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specificatio ns is not implied. exposure to absolute maximum rating conditions for extended periods may affect device reliability. supply voltage (v cc to v ee ) ..................................................+6v voltage inputs (in+, in-, ref) .........(v ee - 0.3v) to (v cc + 0.3v) output voltage max9025/max9027 ....................(v ee - 0.3v) to (v cc + 0.3v) max9026/max9028 ..................................(v ee - 0.3v) to +6v current into input pins ........................................................20ma output current..................................................................?0ma output short-circuit duration .................................................10s continuous power dissipation (t a = +70?) 6-bump ucsp (derate 3.9mw/? above +70?)........308mw operating temperature range ...........................-40? to +85? junction temperature ......................................................+150? storage temperature range .............................-65? to +150? bump temperature (soldering) reflow............................+235? parameter symbol conditions min typ max units supply voltage range v cc inferred from the psrr test 1.8 5.5 v v cc = 1.8v 0.8 1.5 t a = +25c 1.0 1.7 supply current i cc v cc = 5v t a = t min to t max 2.2 ? in+ voltage range v in+ inferred from output swing test v ee - 0.2 v cc + 0.2 v t a = +25c 0.3 5 input offset voltage v os (note 2) t a = t min to t max 10 mv input-referred hysteresis v hb (note 3) 4 mv t a = +25c 0.15 1 input bias current i b t a = t min to t max 2 na power-supply rejection ratio psrr v cc = 1.8v to 5.5v 0.1 1 mv/v t a = +25c 250 350 m ax 9 025, v c c = 5v , i s ou r c e = 6m a t a = t min to t max 450 t a = +25c 56 200 output voltage swing high v cc - v oh m ax 9025, v c c = 1.8v , i s ou rc e = 1m a t a = t min to t max 300 mv t a = +25c 250 350 v c c = 5v , i s i n k = 6m a t a = t min to t max 450 t a = +25c 57 200 output voltage swing low v ol v c c = 1.8v , i s in k = 1m a t a = t min to t max 300 mv output leakage current i leak max9026 only, v o = 5.5v 0.001 1a v cc = 5v 35 sourcing, v o = v ee v cc = 1.8v 3 v cc = 5v 33 output short-circuit current i sc sinking, v o = v cc v cc = 1.8v 3 ma v cc = 1.8v 7 high-to-low propagation delay (note 4) t pd - v cc = 5v 6 ?
max9025?ax9028 ucsp, 1.8v, nanopower, beyond-the-rails comparators with/without reference _______________________________________________________________________________________ 3 electrical characteristics?max9027/max9028 (without ref) (v cc = +5v, v ee = 0v, v cm = 0v, t a = -40? to +85?, unless otherwise noted. typical values are at t a = +25?.) (note 1) electrical characteristics?max9025/max9026 (with ref) (continued) (v cc = +5v, v ee = 0v, v in+ = v ref , t a = -40? to +85?, unless otherwise noted. typical values are at t a = +25?.) (note 1) parameter symbol conditions min typ max units v cc = 1.8v 11 max9025 only v cc = 5v 28 v cc = 1.8v 12 low-to-high propagation delay (note 4) t pd+ max9026 only, r pullup = 100k ? v cc = 5v 31 ? rise time t rise max9025 only, c l = 15pf 1.6 ? fall time t fall c l = 15pf 0.2 ? power-up time t on 1.2 ms t a = +25c 1.224 1.236 1.248 reference voltage v ref t a = t min to t max 1.205 1.267 v reference voltage temperature coefficient tc ref 40 ppm/ ? bw = 10hz to 100khz 29 reference output voltage noise e n c ref = 1nf bw = 10hz to 6khz 60 ? rms reference line regulation ? v ref / ? v cc v cc = 1.8v to 5.5v 0.5 mv/v reference load regulation ? v ref / ? i out ? i out = 0na to 100na 0.03 mv/ na parameter symbol conditions min typ max units supply voltage range v cc inferred from the psrr test 1.8 5.5 v v cc = 1.8v 0.45 0.75 t a = +25 c 0.6 1.0 supply current i cc v cc = 5v t a = t min to t max 1.25 ? input common-mode voltage range v cm inferred from the cmrr test v ee - 0.2 v cc + 0.2 v t a = +25 c 0.3 5 input offset voltage v os -0.2v v cm (v cc + 0.2v) (note 2) t a = t min to t max 10 mv input-referred hysteresis v hb -0.2v v cm (v cc + 0.2v) (note 3) 4 mv t a = +25 c 0.15 1 input bias current i b t a = t min to t max 2 na power-supply rejection ratio psrr v cc = 1.8v to 5.5v 0.1 1 mv/v common-mode rejection ratio cmrr (v ee - 0.2v) v cm (v cc + 0.2v) 0.5 3 mv/v
max9025?ax9028 ucsp, 1.8v, nanopower, beyond-the-rails comparators with/without reference 4 _______________________________________________________________________________________ electrical characteristics?max9027/max9028 (without ref) (continued) (v cc = +5v, v ee = 0v, v cm = 0v, t a = -40? to +85?, unless otherwise noted. typical values are at t a = +25?.) (note 1) note 1: all specifications are 100% tested at t a = +25?. specification limits over temperature (t a = t min to t max ) are guaranteed by design, not production tested. note 2: v os is defined as the center of the hysteresis band at the input. note 3: the hysteresis-related trip points are defined as the edges of the hysteresis band, measured with respect to the center of the band (i.e., v os ) (figure 2). note 4: specified with an input overdrive (v overdrive ) of 100mv, and load capacitance of c l = 15pf. v overdrive is defined above and beyond the offset voltage and hysteresis of the comparator input. for the max9025/max9026, reference voltage error should also be added. parameter symbol conditions min typ max units t a = +25 c 191 400 max9027 only, v cc = 5v, i source = 5ma t a = t min to t max 500 t a = +25 c58 200 output voltage swing high v cc - v oh max9028 only, v cc = 1.8v, i source = 1ma t a = t min to t max 300 mv t a = +25 c 191 400 v cc = 5v, i sink = 5ma t a = t min to t max 500 t a = +25 c56 200 output voltage swing low v ol v cc = 1.8v, i sink = 1ma t a = t min to t max 300 mv output leakage current i leak max9028 only, v o = 5.5v 0.001 1a v cc = 5v 35 sourcing, v o = v ee v cc = 1.8v 3 v cc = 5v 33 output short-circuit current i sc sourcing, v o = v cc v cc = 1.8v 3 ma v cc = 1.8v 16 high-to-low propagation delay (note 4) t pd- v cc = 5v 14 ? v cc = 1.8v 15 max9027 only v cc = 5v 40 v cc = 1.8v, r pullup = 100k ? 16 low-to-high propagation delay (note 4) t pd+ max9028 only v cc = 5v, r pullup = 100k ? 45 ? rise time t rise max9027 only, c l = 15pf 1.6 ? fall time t fall c l = 15pf 0.2 ? power-up time t on 1.2 ms
max9025/max9026 supply current vs. supply voltage max9025-28 toc01 supply voltage (v) supply current (na) 4.5 3.5 2.5 800 1000 1200 600 1.5 5.5 t a = +85 c t a = +25 c t a = -40 c max9025-28 toc02 supply voltage (v) supply current (na) 4.5 3.5 2.5 400 500 600 700 800 300 1.5 5.5 max9027/max9028 supply current vs. supply voltage t a = +85 c t a = +25 c t a = -40 c max9025-28 toc03 temperature ( c) supply current (na) 60 35 10 -15 800 1000 1200 600 -40 85 max9025/max9026 supply current vs. temperature v cc = 5v v cc = 1.8v v cc = 3v max9025-28 toc04 temperature ( c) supply current (na) 60 35 10 -15 400 500 600 700 800 300 -40 85 v cc = 5v v cc = 3v max9027/max9028 supply current vs. temperature v cc = 1.8v output voltage low vs. sink current max9025-28 toc07 sink current (ma) output voltage low (mv) 8 6 4 2 200 400 600 800 0 010 v cc = 5v v cc = 3v v cc = 1.8v max9025-28 toc05 transition frequency (khz) supply current ( a) 10 1 5 10 15 20 25 30 35 40 0 0.1 100 max9025/max9026 supply current vs. output transition frequency v cc = 5v v cc = 3v v cc = 1.8v max9025-28 toc06 transition frequency (khz) supply current ( a) 10 1 5 10 15 20 25 30 35 40 0 0.1 100 max9027/max9028 supply current vs. output transition frequency v cc = 5v v cc = 3v v cc = 1.8v output voltage low vs. sink current max9025-28 toc08 sink current (ma) output voltage low (mv) 8 6 4 2 200 400 600 800 0 010 t a = +85 c t a = +25 c t a = -40 c max9025/max9027 output voltage high vs. source current max9025-28 toc09 source current (ma) output voltage high (v cc - v oh , mv) 8 6 4 2 200 400 600 800 0 010 v cc = 5v v cc = 3v v cc = 1.8v max9025?ax9028 ucsp, 1.8v, nanopower, beyond-the-rails comparators with/without reference _______________________________________________________________________________________ 5 t ypical operating characteristics (v cc = +5v, v ee = 0v, c l = 15pf, v overdrive = 100mv, t a = +25?, unless otherwise noted.)
t ypical operating characteristics (continued) (v cc = +5v, v ee = 0v, c l = 15pf, v overdrive = 100mv, t a = +25?, unless otherwise noted.) max9025?ax9028 ucsp, 1.8v, nanopower, beyond-the-rails comparators with/without reference 6 _______________________________________________________________________________________ max9025/max9027 output voltage high vs. source current max9025-28 toc10 source current (ma) output voltage high (v cc - v oh , mv) 8 6 4 2 200 400 600 800 0 010 t a = +85 c t a = +25 c t a = -40 c short-circuit sink current vs. temperature max9025-28 toc11 temperature ( c) short-circuit sink current (ma) 60 35 10 -15 10 20 30 40 0 -40 85 v cc = 5v v cc = 3v v cc = 1.8v v out = v cc max9025/max9027 short-circuit source current vs. temperature max9025-28 toc12 temperature ( c) short-circuit sink current (ma) 60 35 10 -15 10 20 30 40 0 -40 85 v cc = 5v v cc = 3v v cc = 1.8v v out = v ee offset voltage vs. temperature max9025-28 toc13 temperature ( c) offset voltage (mv) 60 35 10 -15 0.3 0.5 0.8 1.0 0 -40 85 v cc = 5v v cc = 3v v cc = 1.8v hysteresis voltage vs. temperature max9025-28 toc14 temperature ( c) hysteresis voltage (mv) 60 35 10 -15 2.5 3.0 3.5 4.0 2.0 -40 85 v cc = 5v v cc = 3v v cc = 1.8v -1.000 -0.600 0.200 -0.200 0.600 1.000 -0.5 1.5 0.5 2.5 3.5 4.5 5.5 input bias current vs. input bias voltage max9025-28 toc15 input bias voltage (in-) (v) input bias current (in-) (na) in+ = 2.5v max9025/max9026 reference voltage vs. temperature max9025-28 toc16 temperature ( c) reference voltage (v) 60 35 10 -15 1.2340 1.2350 1.2360 1.2370 1.2330 -40 85 v cc = 5v v cc = 3v v cc = 1.8v max9025/max9026 reference voltage vs. temperature max9025-28 toc17 temperature ( c) reference voltage (v) 60 35 10 -15 1.233 1.235 1.237 1.239 1.231 -40 85 5 devices max9025/max9026 reference voltage vs. supply voltage max9025-28 toc18 supply voltage (v) reference voltage (v) 4.5 3.5 2.5 1.235 1.236 1.237 1.238 1.234 1.5 5.5
t ypical operating characteristics (continued) (v cc = +5v, v ee = 0v, c l = 15pf, v overdrive = 100mv, t a = +25?, unless otherwise noted.) max9025?ax9028 ucsp, 1.8v, nanopower, beyond-the-rails comparators with/without reference _______________________________________________________________________________________ 7 40 30 20 10 0 0.01 1 0.1 10 100 max9025/max9027 propagation delay (t pd+ ) vs. capacitive load max9025-28 toc23 capacitive load (nf) t pd+ ( s) v cc = 5v v cc = 3v v cc = 1.8v 0 10 20 30 40 50 60 70 80 0102 0304050 propagation delay (t pd- ) vs. input overdrive max9025-28 toc24 input overdrive (mv) t pd- ( s) v cc = 5v v cc = 3v v cc = 1.8v 0 20 10 40 30 50 60 020 10 30 40 50 max9025/max9027 propagation delay (t pd+ ) vs. input overdrive max9025-28 toc25 input overdrive (mv) t pd+ ( s) v cc = 5v v cc = 3v v cc = 1.8v max9026/max9028 propagation delay (t pd+ ) vs. pullup resistance max9025-28 toc26 pullup resistance (k ? ) t pd+ ( s) 1000 100 25 50 75 100 125 150 175 200 0 10 10000 v cc = 5v v cc = 3v v cc = 1.8v 20 s/div propagation delay (v cc = 5v) +100mv max9025 toc27 -100mv out 2v/div 0v in+ max9025/max9026 reference voltage vs. reference current max9025-28 toc19 reference current (na) reference voltage (v) 50 0 -50 1.234 1.236 1.238 1.240 1.232 -100 100 v cc = 5v v cc = 3v v cc = 1.8v propagation delay (t pd- ) vs. temperature max9025-28 toc20 temperature ( c) t pd- ( s) 60 35 10 -15 5 10 15 20 0 -40 85 v cc = 5v v cc = 3v v cc = 1.8v max9025/max9027 propagation delay (t pd+ ) vs. temperature max9025-28 toc21 temperature ( c) t pd+ ( s) 60 35 10 -15 10 20 30 40 50 0 -40 85 v cc = 5v v cc = 3v v cc = 1.8v 20 15 10 5 0 0.01 1 0.1 10 100 propagation delay (t pd- ) vs. capacitive load max9025-28 toc22 capacitive load (nf) t pd- ( s) v cc = 5v v cc = 3v v cc = 1.8v
t ypical operating characteristics (continued) (v cc = +5v, v ee = 0v, c l = 15pf, v overdrive = 100mv, t a = +25?, unless otherwise noted.) max9025?ax9028 ucsp, 1.8v, nanopower, beyond-the-rails comparators with/without reference 8 _______________________________________________________________________________________ 20 s/div propagation delay (v cc = 1.8v) +100mv max9025 toc29 -100mv out 1v/div 0v in+ 200 s/div 1khz frequency response (v cc = 5v) +100mv max9025 toc30 -100mv out 2v/div 0v in+ 20 s/div propagation delay (v cc = 3v) +100mv max9025 toc28 -100mv out 1v/div 0v in+ 1ms/div reference response to supply voltage transient (c ref = 10nf) ref 200mv/div max9025 toc32 v cc 1v/div 1.8v 5v 40 s/div power-up/power-down response v cc max9025 toc33 0v out 2v/div 0v 2v/div 20 s/div 10khz frequency response (v cc = 1.8v) +100mv max9025 toc31 -100mv out 1v/div 0v in+
max9025?ax9028 ucsp, 1.8v, nanopower, beyond-the-rails comparators with/without reference _______________________________________________________________________________________ 9 functional diagrams max9025 max9026 in+ out v cc v ee in- ref 1 .236v max9027 max9028 in+ out v cc v ee in- ref detailed description the max9025/max9026 feature an on-board 1.236v ?% reference, yet draw an ultra-low supply current of 1.0?. the max9027/max9028 (without reference) consume just 0.6? of supply current. all four devices are guaranteed to operate down to +1.8v. their com- mon-mode input voltage range extends 200mv beyond-the-rails. internal hysteresis ensures clean out- put switching, even with slow-moving input signals. large internal output drivers allow rail-to-rail output swing with up to ?ma loads. the output stage employs a unique design that mini- mizes supply-current surges while switching, virtually eliminating the supply glitches typical of many other comparators. the max9025/max9027 have a push-pull output stage that sinks as well as sources current. the max9026/max9028 have an open-drain output stage that can be pulled beyond v cc to a maximum of 5.5v above v ee . these open-drain versions are ideal for implementing wire-or output logic functions. input stage circuitry the input common-mode voltage range extends from v ee - 0.2v to v cc + 0.2v. these comparators operate at any differential input voltage within these limits. input bias current is typically ?.15na if the input voltage is between the supply rails. comparator inputs are pro- tected from overvoltage by internal esd protection diodes connected to the supply rails. as the input volt- age exceeds the supply rails, these esd protection diodes become forward biased and begin to conduct. output stage circuitry the max9025?ax9028 contain a unique break- before-make output stage capable of rail-to-rail opera- tion with up to ?ma loads. many comparators consume orders of magnitude more current during switching than during steady-state operation. however, with this family of comparators, the supply-current change during an output transition is extremely small. in the typical operating characteristics , the supply current vs. output transition frequency graphs show the minimal supply-current increase as the output switching frequency approaches 1khz. this character- istic reduces the need for power-supply filter capaci- tors to reduce glitches created by comparator switching currents. in battery-powered applications, this characteristic results in a substantial increase in battery life. pin max9025/ max9026 max9027/ max9028 name function a2 a2 out comparator output a3 a3, b2 v ee negative supply voltage b1 b1 in+ comparator noninverting input b2 ref 1.236v reference output a1 a1 v cc positive supply voltage b3 b3 in- comparator inverting input pin description
max9025?ax9028 ucsp, 1.8v, nanopower, beyond-the-rails comparators with/without reference 10 ______________________________________________________________________________________ reference (max9025/max9026) the max9025?ax9028s?internal +1.236v reference has a typical temperature coefficient of 40ppm/? over the full -40? to +85? temperature range. the reference is a very-low-power bandgap cell, with a typical 35k ? output impedance. ref can source and sink up to 100na to external circuitry. for applications needing increased drive, buffer ref with a low input-bias current op amp such as the max4162. most applications require no ref bypass capacitor. for noisy environments or fast v cc transients, connect a 1nf to 10nf ceramic capacitor from ref to gnd. applications information low-voltage, low-power operation the max9025?ax9028 are ideally suited for use with most battery-powered systems. table 1 lists a variety of battery types, capacities, and approximate operating times for the max9025?ax9028, assuming nominal conditions. internal 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 max9025?ax9028 have internal 4mv hysteresis to counter parasitic effects and noise. the hysteresis in a comparator creates two trip points: one for the rising input voltage (v thr ) and one for the falling input voltage (v thf ) (figure 2). the difference between the trip points is the hysteresis (v hb ). when the comparator? input voltages are equal, the hystere- sis effectively causes one comparator input to move quickly past the other, thus taking the input out of the region where oscillation occurs. figure 2 illustrates the case in which in- has a fixed voltage applied, and in+ is varied. if the inputs were reversed, the figure would be the same, except with an inverted output. adding external hysteresis in applications requiring more than the internal 4mv hysteresis of the max9025?ax9028, additional hys- teresis can be added with external components. because the max9025?ax9028 are intended for very low-power systems, care should be taken to minimize power dissipation in the additional circuitry. regardless of which approach is taken, the external hysteresis w ill be v cc dependent. over the full discharge range of battery-powered systems, the hysteresis can change as much as 40%. this must be considered during design. bandgap ref v ee v cc figure 1. max9025/max9026 voltage reference output equivalent circuit table 1. battery applications using max9025?max9028 battery type rechargeable v fresh (v) v end-of-life (v) capacity, aa size (m a-h) max9025/max9026 operating time ( hr) max9027/max9028 operating time ( hr) alkaline (2 cells) no 3.0 1.8 2000 1.8 x 10 6 2.8 x 10 6 nickel- cadmium (2 cells) yes 2.4 1.8 750 680,000 1.07 x 10 6 lithium-ion (1 cell) yes 3.5 2.7 1000 0.9 x 10 6 1.4 x 10 6 nickel-metal- hydride (2 cells) yes 2.4 1.8 1000 0.9 x 10 6 1.4 x 10 6
max9025?ax9028 ucsp, 1.8v, nanopower, beyond-the-rails comparators with/without reference ______________________________________________________________________________________ 11 thresholds out in+ in- v hb hysteresis band v thf v thr figure 2. threshold hysteresis band v cc max9027 out r s r fb v cc /2 vin figure 3. max9025/max9027 external hysteresis simplest circuit the simplest circuit for adding external hysteresis is shown in figure 3. in this example, the hysteresis is defined by: where r s is the source resistance and r fb is the feed- back resistance. because the comparison threshold is 1/2 v cc , the max9027 was chosen for its push-pull out- put and lack of reference. this provides symmetrical hysteresis around the threshold. output considerations in most cases, the push-pull outputs of the max9025/max9027 are best for external hysteresis. the open-drain output of the max9026/max9028 can be used, but the effect of the feedback network on the actual output high voltage must be considered. component selection because the max9025?ax9028 are intended for very low power-supply systems, the highest impedance cir- cuits should be used wherever possible. the offset error due to input-bias current is proportional to the total impedance seen at the input. for example, select- ing components for figure 3, with a target of 50mv hys- teresis, a 5v supply, and choosing an r fb of 10m ? gives r s as 100k ? . the total impedance seen at in+ is therefore 10m ? || 100k ? , or 99k ? . the maximum i b of the max9025?ax9028 is 2na; therefore, the error due to source impedance is less than 400?. asymmetrical hysteresis when the input threshold is not set at 1/2 v cc , the hys- teresis added to the input threshold will not be symmet- rical. this is typical of the max9025/max9026 where the internal reference is usually used as the threshold. if the asymmetry is unacceptable, it can be corrected by adding resistors to the circuit. board layout and bypassing power-supply bypass capacitors are not typically need- ed, but use 100nf bypass capacitors close to the device? supply pins when supply impedance is high, supply leads are long, or excessive noise is expected on the supply lines. minimize signal trace lengths to reduce stray capacitance. a ground plane and surface- mount components are recommended. if the ref pin is decoupled, use a new low-leakage capacitor. zero-crossing detector figure 4 shows a zero-crossing detector application. the max9027? inverting input is connected to ground, and its noninverting input is connected to a 100mv p-p signal source. as the signal at the noninverting input crosses 0v, the comparator? output changes state. logic-level translator the typical application circuit shows an application that converts 5v logic to 3v logic levels. the max9028 is powered by the +5v supply voltage, and the pullup resistor for the max9028? open-drain output is con- nected to the +3v supply voltage. this configuration allows the full 5v logic swing without creating overvolt- age on the 3v logic inputs. for 3v to 5v logic-level translations, simply connect the +3v supply voltage to v cc and the +5v supply voltage to the pullup resistor. hysteresis r r v s fb cc =
max9025?ax9028 ucsp, 1.8v, nanopower, beyond-the-rails comparators with/without reference 12 ______________________________________________________________________________________ ucsp applications information for the latest application details on ucsp construction, dimensions, tape carrier information, printed circuit board techniques, bump-pad layout, and recommended reflow temperature profiles, as well as the latest information on reliability testing results, go to maxim? web site at www.maxim-ic.com/ucsp to find the application note: ucsp? wafer-level chip-scale package . chip information transistor count: 209 process: bicmos max9028 in- 2m ? 2m ? r pullup 3v (5v) logic out out v cc +5v (+3v) +3v (+5v) v ee 5v (3v) logic in in+ logic-level translator t ypical application circuit max9027 in+ out v cc 100mv p-p v cc v ee in- figure 4. zero-crossing detector
ucsp, 1.8v, nanopower, beyond-the-rails comparators with/without reference max9025?ax9028 maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a maxim product. no circu it patent licenses are implied. maxim reserves the right to change the circuitry and specifications without notice at any time. maxim integrated products, 120 san gabriel drive, sunnyvale, ca 94086 408-737-7600 ____________________ 13 2004 maxim integrated products printed usa is a registered trademark of maxim integrated products. 6l, ucsp.eps g 1 1 21-0097 package outline, 3x2 ucsp package information (the package drawing(s) in this data sheet may not reflect the most current specifications. for the latest package outline info rmation go to www.maxim-ic.com/packages .) note: the max9025ebt?ax9028ebt use package code b6-1.

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