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general description the MAX9644/max9645/max9646 are small, single com- parators, ideal for a wide variety of portable electronics applications such as cell phones, media players, and notebooks that have extremely tight board space and power constraints. these comparators are offered in both a miniature 4-bump ucsp package with a 1mm x 1mm footprint (as small as two 0402 resistors) and a 5-pin sot23 package. the ics feature an input voltage range of -0.3v to +5.5v, independent of supply voltage. these devices maintain high impedance at the inputs even when pow- ered down (v cc or v ref = 0v). they also feature inter- nal filtering to provide high rf immunity. the ics have an internal 0.2v reference. these devices feature either a push-pull or an open-drain output. they consume only 700na (max) supply current and operate down to v cc = 1v over the extended -40? to +85? tem- perature range. applications cell phones portable media players electronic toys notebook computers portable medical devices features tiny, 1mm x 1mm x 0.6mm 4-bump ucsp footprint = two 0402 resistors also available in a 5-pin sot23 package ultra-low operating current (100na max) -0.3v to +5.5v input voltage range internal 0.2v reference trimmed to 1% accuracy 15 s propagation delay -40? to +85? extended temperature range MAX9644/max9645/max9646 low-power comparators with precision reference in 4-bump ucsp ________________________________________________________________ maxim integrated products 1 19-5803; rev 0; 3/11 for pricing, delivery, and ordering information, please contact maxim direct at 1-888-629-4642, or visit maxim? website at www.maxim-ic.com. evaluation kit available ordering information part pin-package top mark MAX9644 ebs+g45 4 ucsp +agl MAX9644euk+ 5 sot23 +afjn max9645 ebs+g45 4 ucsp +agm max9645euk+ 5 sot23 +afjo max9646 ebs+g45 4 ucsp +agn max9646euk+ 5 sot23 +afjp note: all devices are specified over the extended -40? to +85? operating temperature range. + denotes a lead(pb)-free/rohs-compliant package. g45 = protective die coating. ucsp is a trademark of maxim integrated products, inc. part reference voltage (v) input output MAX9644 0.2 noninverting open drain max9645 0.2 inverting open drain max9646 0.2 noninverting push-pull selector guide
MAX9644/max9645/max9646 low-power comparators with precision reference in 4-bump ucsp 2 _______________________________________________________________________________________ absolute maximum ratings electrical characteristics (v cc = 3.3v, r pullup = 10k ? to v pullup = 3.3v for MAX9644/max9645, t a = -40? to +85?. typical values at t a = +25?, unless otherwise noted.) (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. v cc , ref, in to gnd................................................-0.3v to +6v out to gnd (MAX9644/max9645)..........................-0.3v to +6v out to gnd (max9646 only) .................-0.3v to + (v cc + 0.3v) output short-circuit current duration ....................................10s input current into any terminal........................................?0ma continuous power dissipation 4-bump ucsp (derate 3.0mw/? above +70?) .......238 mw 5-pin sot23 (derate 3.9mw/? above +70?)...........312 mw operating temperature range ...........................-40? to +85? junction temperature ......................................................+150? storage temperature range .............................-65? to +150? bump temperature (soldering) reflow............................+235? lead temperature (soldering, 10s) .................................+300? soldering temperature (reflow) .......................................+260? parameter symbol conditions min typ max units dc characteristics input voltage range v in guaranteed by i in test -0.3 +5.5 v input bias current i in v in = 0.2v to 5.5v (note 2) 0.06 15 na input leakage current i in_shdn v cc = 0, v in = 5.5v (note 2) < 0.1 15 na i sink = 50?, v cc = 1.0v 0.03 0.2 i sink = 200?, v cc = 1.2v 0.08 0.20 i sink = 500?, v cc = 1.8v 0.13 0.23 i sink = 0.75ma, v cc = 3.3v 0.14 0.3 output voltage low v ol i sink = 1.2ma, v cc = 5.5v 0.19 0.5 v i source = 15?, v cc = 1.0v v c c - 0.08v v c c - 0.2v i source = 40?, v cc = 1.2v v c c - 0.08v v c c - 0.20v i source = 180?, v cc = 1.8v v c c - 0.15v v c c - 0.23v i source = 0.3ma, v cc = 3.3v v c c - 0.13v v c c - 0.3v output voltage high (max9464 only) v oh i source = 0.75ma, v cc = 5.5v v c c - 0.24v v c c - 0.5v v output leakage current (MAX9644/max9645 only) i out_leakage out = high, v pullup = 5.5v (note 2) < 0.1 15 na ac characteristics propagation delay t pd v overdrive = ?00mv (note 3) 15 ? fall time t f c l = 10pf 14 ns rise time t r c l = 10pf, max9646 only 30 ns reference voltage max964_ebs+ 200 input threshold (note 4) v ref max964_euk+ 199 mv t a = +25? -1 +1 input threshold error (note 4) delta-v ref t a = -40? to +85? -3.5 +3.5 % input threshold hysteresis v hys t a = -40? to +85? (note 5) ?.9 mv ref tempco v ref_tempco (note 6) 6 ?/? power-supply rejection ratio psrr v cc = 1.0v to 5.5v 40 53 db
MAX9644/max9645/max9646 low-power comparators with precision reference in 4-bump ucsp _______________________________________________________________________________________ 3 note 1: all devices are 100% production tested at t a = +25?. temperature limits are guaranteed by design. note 2: too small to be measured in an ate test environment. only gross test to catch failures is implemented. note 3: overdrive is defined as the voltage above or below the switching points. note 4: guaranteed by ate and/or bench characterization over temperature. v ref is the average of the trip points. note 5: hysteresis is half the input voltage difference between the two switching points. note 6: includes reference error along with comparator offset voltage error. electrical characteristics (v cc = 3.3v, r pullup = 10k ? to v pullup = 3.3v for MAX9644/max9645, t a = -40? to +85?. typical values at t a = +25?, unless otherwise noted.) (note 1) parameter symbol conditions min typ max units power supply supply voltage v cc guaranteed by v ol /v oh tests 1.0 5.5 v v cc = 1.0v 0.4 0.7 supply current i cc v cc = 5.5v 0.6 1.1 ? power-up time t on 3ms typical operating characteristics (v cc = 3.3v, v ref = 1.8v, r pullup = 10k ? to v pullup = 3.3v for MAX9644/max9645, gnd = 0, t a = +25?, unless otherwise noted.) supply current vs. supply voltage MAX9644 toc01 supply voltage (v) supply current (na) 5 4 3 2 1 200 400 600 800 1000 0 06 +85 c -40 c +25 c supply current vs. output transition frequency MAX9644 toc02 output transition frequency (khz) supply current ( a) 110 10 100 1 0.1 100 v cc = 5v v cc = 3.3v v cc = 1.8v output voltage low vs. sink current MAX9644 toc03 sink current (ma) output voltage low (v) 6 2 0.5 1.0 0.1 0.6 0.4 0.9 0.3 0.8 0.2 0.7 0 048 v ref = 3.3v v ref = 1.8v v ref = 5v
input bias current vs. input bias voltage MAX9644 toc05 input bias voltage (v) input bias current (na) -5 5 0 -10 -15 -20 0 0.20 0.25 0.30 0.05 0.10 0.15 v cc = 3.3v reference voltage vs. temperature MAX9644 toc11 temperature ( c) reference voltage (mv) 201.6 202.0 201.8 201.4 201.2 201.0 201.7 201.9 201.5 201.3 201.1 -40 85 10 60 -15 35 v cc = 3.3v reference voltage vs. supply voltage MAX9644 toc07 supply voltage (v) reference voltage (mv) 200.2 201.0 200.6 199.8 199.4 199.0 200.4 200.8 200.0 199.6 199.2 1.0 5.0 2.5 3.0 4.5 4.0 1.5 2.0 3.5 MAX9644/max9645/max9646 low-power comparators with precision reference in 4-bump ucsp 4 _______________________________________________________________________________________ typical operating characteristics (v cc = 3.3v, v ref = 1.8v, r pullup = 10k ? to v pullup = 3.3v for MAX9644/max9645, gnd = 0, t a = +25?, unless otherwise noted.) propagation delay vs. temperature MAX9644 toc08 temperature ( c) propagation delay ( s) 14 17 10 15 16 13 12 11 9 -40 -15 60 85 35 10 v cc = 3.3v v cc = 1.8v v cc = 5v v od = 100mv propagation delay vs. input overdrive MAX9644 toc09 input overdrive (mv) propagation delay ( s) 50 80 10 60 40 30 20 70 0 0 100 150 250 200 50 v cc = 3.3v v cc = 1.8v v cc = 5v output voltage high vs. source current (max9646) MAX9644 toc04 source current (ma) oiutput voltage high (v cc - v oh , v) 0.5 1.0 0.1 0.6 0.4 0.9 0.3 0.8 0.2 0.7 0 01.5 1.0 2.5 3.0 0.5 2.0 v cc = 3.3v v cc = 1.8v v cc = 5v
MAX9644/max9645/max9646 low-power comparators with precision reference in 4-bump ucsp _______________________________________________________________________________________ 5 typical operating characteristics (continued) (v cc = 3.3v, v ref = 1.8v, r pullup = 10k ? to v pullup = 3.3v for MAX9644/max9645, gnd = 0, t a = +25?, unless otherwise noted.) propagation delay at v cc = 3.3v MAX9644 toc10 100 s/div 0v 0.1v 0.3v in+ 100mv/div out 2v/div reference voltage vs. temperature MAX9644 toc11 reference voltage (mv) 201.6 202.0 201.8 201.4 201.2 201.0 201.7 201.9 201.5 201.3 201.1 -40 85 10 60 -15 35 v cc = 3.3v power-supply rejection for no false triggering MAX9644 toc14 frequency (hz) trip point (mv) 100k 100 200 206 194 202 196 204 198 10 10k 1k 1m v cc = 3.3v + 100mv p-p upper trip point lower trip point power-up/power-down response MAX9644 toc12 1ms/div 0v 0v v cc 2v/div out 2v/div v in = 0.3v v cc = 3.3v output response to supply voltage transient MAX9644 toc13 1ms/div 0v 0v 0v 3v 3.2v v cc 200mv/div out 2v/div out 2v/div out 2v/div v in = v th + 20mv v in = v th + 10mv v in = v th + 1mv
MAX9644/max9645/max9646 low-power comparators with precision reference in 4-bump ucsp 6 _______________________________________________________________________________________ pin description pin ucsp sot23 name function a1 5 out comparator output. the MAX9644/max9645 have open-drain outputs. the max9646 has a push-pull output. a2 4 in comparator input. the MAX9644/max9646 have noninverting inputs. the max9645 has inverting inputs. b1 1 v cc power-supply voltage. bypass to ground with a 0.1? bypass capacitor. b2 2, 3 gnd ground MAX9644 max9645 max9646 MAX9644 max9645 max9646 a1 ucsp sot23 top view (bumps on bottom) a2 b1 b2 in gnd out v cc 1 + 3 2 5 4 v cc gnd out in gnd pin configuration
MAX9644/max9645/max9646 low-power comparators with precision reference in 4-bump ucsp _______________________________________________________________________________________ 7 detailed description the MAX9644/max9645/max9646 are extremely small comparators ideal for compact, low-current, and low- voltage applications. the ics consume only 400na (typ). the low-voltage operating capability of the operating current makes these devices extremely attractive to long-life battery- operated devices?hese applications can now use a single digital power-supply rail to power the new gener- ation of microcontrollers (which can be down to 0.9v). all parts are available in a tiny 4-bump ucsp, which is only 0.6mm tall and occupies a 1mm x 1mm footprint and a 5-pin sot23. input stage circuitry noninverting inputs are available on the MAX9644/ max9646 and inverting inputs are available on the max9645. the MAX9644/max9645/max9646 incorporate an inno- vative input stage architecture that allows their input voltage to exceed v cc by several volts (limited only by the absolute maximum ratings ). this is unlike tradition- al comparators that have an input esd diode clamp between the input and v cc , limiting this maximum over- voltage to about 0.3v. the ics architecture maintains a high input impedance to input signals even when the device power-supply voltage is completely turned off (v cc or ref taken to 0v). this greatly benefits flexible power-saving schemes to be easily implemented in advanced battery-operated devices. on-chip filtering provides immunity from any rf noise being picked up by input traces. these devices feature an internal tempera- ture-compensated, low-power 0.2v reference voltage. output stage structure the MAX9644/max9645 have open-drain outputs that allow them to interface to logic circuitry running from supply voltages other than the one supplied to the part. these devices require an external pullup resistor or current source for proper operation. many microcon- troller digital inputs ports can be readily programmed to include these. the max9646 has a push-pull output stage that can both sink and source current, eliminating the need for an external pullup resistor. in this case, the max9646 uses the microcontroller? power supply as v cc . applications information bypassing ref/v cc place a 0.1? capacitor between ref or v cc and gnd as close as possible to the device. during a switching event, all comparators draw a current spike from their power-supply rails. this current spike is minimized by the use of an internal break-before-make design. hysteresis operation the ics feature internal hysteresis for noise immunity and glitch-free operation. if additional hysteresis is needed, an external positive feedback network can be easily implemented on the MAX9644 and max9646 non- inverting input devices. additional external hysteresis is not possible on the max9645 because the noninverting input of the comparator is not externally accessible. part input voltage conditions action at output v in > 0.2v external pullup resistor pulls output high. MAX9644 v in < 0.2v output asserts low. v in > 0.2v output asserts low. max9645 v in < 0.2v external pullup resistor pulls output high. v in > 0.2v output asserts high. max9646 v in < 0.2v output asserts low. table 1. how devices behave under various input voltage conditions
MAX9644/max9645/max9646 low-power comparators with precision reference in 4-bump ucsp 8 _______________________________________________________________________________________ typical operating circuits MAX9644 in microcontroller internal pullup v dd v cc = 1.0v to 5.5v i/o out 0.2v ref max9646 in microcontroller v dd v cc = 1.0v to 5.5v i/o out 0.2v ref max9645 in microcontroller internal pullup v dd v cc = 1.0v to 5.5v i/o out 0.2v ref chip information process: bicmos
MAX9644/max9645/max9646 low-power comparators with precision reference in 4-bump ucsp _______________________________________________________________________________________ 9 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 per - tains to the package regardless of rohs status. package type package code document no. land pattern no. 4 ucsp b4+1 21-0117 refer to application note 1891 5 sot23 u5+2 21-0057 90-0174
MAX9644/max9645/max9646 low-power comparators with precision reference in 4-bump ucsp 10 ______________________________________________________________________________________ package information (continued) 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 per - tains to the package regardless of rohs status. sot-23 5l .eps
MAX9644/max9645/max9646 low-power comparators with precision reference in 4-bump ucsp 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 ____________________ 11 2011 maxim integrated products maxim is a registered trademark of maxim integrated products, inc. revision history revision number revision date description pages changed 0 3/11 initial release

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