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general description the max6439?ax6442 are a family of ultra-low-powerbattery monitors with integrated microprocessor (?) supervisors. the battery monitors are offered with sin- gle or dual low-battery output options that can be used to signal when the battery is ok (enabling full system operation), when the battery is low (for low-power sys- tem operation), and when the battery is dead (to dis- able system operation). these devices also have an independent ? supervisor that monitors v cc and pro- vides an active-low reset output. a manual reset func-tion is available to reset the ? with a push-button. no external components are required. the max6439?ax6442 are offered with several facto- ry-trimmed low-battery threshold combinations ideal for single-cell lithium-ion (li+) or multicell alkaline/nicd/ nimh applications. when the battery voltage drops below each specified low threshold, the low-battery out- puts are asserted to alert the system. when the voltage rises above the specified high thresholds, the outputs are deasserted after a 150ms minimum timeout period, ensuring the voltages have stabilized before power cir- cuitry is activated or providing microprocessor reset tim- ing. the low and high thresholds provide hysteresis in battery-operated systems to eliminate output chattering. the max6439/max6440 offer factory-trimmed battery monitors with a single output. the max6441/max6442 offer factory-trimmed battery monitors with dual outputs. all battery monitors have open-drain low-battery outputs. the max6439?ax6442 monitor system voltages (v cc ) from 1.8v to 3.3v with seven fixed reset threshold options. each device is offered with two minimum resettimeout periods of 150ms or 1200ms. the max6439/ max6441 are offered with an open-drain reset output and the max6440/max6442 are offered with a push-pull reset output. the max6439?ax6442 are offered in a sot23 pack-age and are fully specified over a -40? to +85? temp- erature range. applications battery-powered systems (single-cell li+ ortwo-/three-cell nimh, nicd, alkaline) cell phones/cordless phones portable medical devices electronic toys pagers pdas mp3 players features ? factory-trimmed v batt threshold options for monitoring single-cell li+ or multicellalkaline/nicd/nimh applications ? immune to short battery voltage transients ? low current (2.5? typ at 3.6v) ? single and dual low-battery output options ? 150ms minimum lbo timeout period ? independent ? reset with manual reset ? factory-set reset thresholds for monitoring v cc from 1.8v to 3.3v ? available with 150ms (min) and 1.2s (min) v cc reset timeout period options ? -40? to +85? operating temperature range ? small 6- and 8-pin sot23 packages ? no external components max6439?ax6442 low-power, single-/dual-level battery monitors with hysteresis and integrated ? reset ________________________________________________________________ maxim integrated products 1 mr reset lbo 16 v cc 5 gnd v batt max6439max6440 sot23-6 top view 234 pin configurations ordering information 19-2535; rev 1; 12/05 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 temp range pin-package max6439 ut_ _ _d_-t -40? to +85? 6 sot23-6 max6440 ut_ _ _d_-t -40? to +85? 6 sot23-6 max6441 ka_ _ _d_-t -40? to +85? 8 sot23-8 max6442 ka_ _ _d_-t -40? to +85? 8 sot23-8 note: the first two ? _?are placeholders for the battery moni- tor voltage levels. desired threshold levels are set by the partnumber suffix found in tables 1 and 2. the third ??is the v cc reset threshold level suffix found in table 3. the ??after the dis a placeholder for the reset timeout period suffix found in table 4. all devices are available in tape-and-reel only. there is a 2500-piece minimum order increment for standard ver- sions. sample stock is typically held on standard versions only. nonstandard versions require a minimum order increment of 10,000 pieces. contact factory for availability. devices are available in both leaded and lead-free packaging. specify lead-free by replacing ?t?with ?t?when ordering. pin configurations continued at end of data sheet. downloaded from: http:///
max6439?ax6442 low-power, single-/dual-level battery monitors with hysteresis and integrated ? reset 2 _______________________________________________________________________________________ absolute maximum ratings stresses beyond those listed under ?bsolute 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. * applying 7v for a duration of 1ms does not damage the device. v batt , v cc to gnd.................................................-0.3v to +6v* open-drain lbo , lboh , lbol , lbolh to gnd ...-0.3v to +6v* open-drain reset to gnd ....................................-0.3v to +6v* push-pull reset to gnd............................-0.3v to (v cc + 0.3v) mr to gnd .................................................-0.3v to (v cc + 0.3v) input/output current, all pins .............................................20ma continuous power dissipation (t a = +70?) 6-pin sot23 (derate 8.7mw/? above +70?)............695mw 8-pin sot23 (derate 8.9mw/? above +70?)............714mw operating temperature range .......................... -40? to +85? junction temperature ......................................................+150? storage temperature range .............................-65? to +150? lead temperature (soldering, 10s) .................................+300? electrical characteristics(v batt = 1.2v to 5.5v, v cc = 1.2v to 5.5v, t a = -40? to +85?, unless otherwise specified. typical values are at t a = +25?.) (note1) parameter symbol conditions min typ max units t a = 0? to +85? 1.0 5.5 v batt operating voltage range v batt t a = -40? to +85? 1.2 5.5 v t a = 0? to +85? 1.0 5.5 v cc operating voltage range v cc t a = -40? to +85? 1.2 5.5 v v cc + v batt supply current i cc + i batt v batt = 3.6v, v cc = 3.3v, no load (note 2) 2.5 7 a v batt thresholds max6439ut_ j, max6440ut_ j 3.510 3.60 3.690 max6439ut_ i, max6440ut_ i 3.413 3.50 3.588 max6439ut_ h, max6440ut_ h 3.315 3.40 3.485 max6439ut_ g, max6440ut_ g 3.218 3.30 3.383 max6439ut_ t, max6440ut_ t 2.535 2.60 2.665 max6439ut_ s, max6440ut_ s 2.438 2.50 2.563 max6439ut_ r, max6440ut_ r 2.340 2.40 2.460 hth threshold hth max6439ut_ q, max6440ut_ q 2.243 2.30 2.358 v max6439utf, max6440utf 3.023 3.10 3.178 max6439ute, max6440ute 2.925 3.00 3.075 max6439utd, max6440utd 2.828 2.90 2.973 max6439utc, max6440utc 2.730 2.80 2.870 max6439utb, max6440utb 2.633 2.70 2.768 max6439uta, max6440uta 2.535 2.60 2.665 max6439utp, max6440utp 2.048 2.10 2.153 max6439uto, max6440uto 1.950 2.00 2.050 max6439utn, max6440utn 1.853 1.90 1.948 max6439utm, max6440utm 1.755 1.80 1.845 max6439utl, max6440utl 1.658 1.70 1.743 lth threshold lth max6439utk, max6440utk 1.560 1.60 1.640 v downloaded from: http:///
max6439?ax6442 low-power, single-/dual-level battery monitors with hysteresis and integrated ? reset _______________________________________________________________________________________ 3 electrical characteristics (continued)(v batt = 1.2v to 5.5v, v cc = 1.2v to 5.5v, t a = -40? to +85?, unless otherwise specified. typical values are at t a = +25?.) (note1) parameter symbol conditions min typ max units max6441ut_ j, max6442ut_ j 3.510 3.600 3.690 max6441ut_ i, max6442ut_ i 3.413 3.500 3.588 max6441ut_ h, max6442ut_ h 3.315 3.400 3.485 max6441ut_ g, max6442ut_ g 3.218 3.300 3.383 max6441ut_ t, max6442ut_ t 2.535 2.600 2.665 max6441ut_ s, max6442ut_ s 2.438 2.500 2.563 max6441ut_ r, max6442ut_ r 2.340 2.400 2.460 hth- threshold hth- max6441ut_ q, max6442ut_ q 2.243 2.300 2.358 v max6441ut_ j, max6442ut_ j 3.686 3.780 3.875 max6441ut_ i, max6442ut_ i 3.583 3.675 3.767 max6441ut_ h, max6442ut_ h 3.481 3.570 3.659 max6441ut_ g, max6442ut_ g 3.378 3.465 3.552 max6441ut_ t, max6442ut_ t 2.662 2.730 2.798 max6441ut_ s, max6442ut_ s 2.559 2.625 2.691 max6441ut_ r, max6442ut_ r 2.457 2.520 2.583 hth+ threshold hth+ max6441ut_ q, max6442ut_ q 2.355 2.415 2.476 v max6441utf, max6442utf 3.023 3.100 3.178 max6441ute, max6442ute 2.925 3.000 3.075 max6441utd, max6442utd 2.828 2.900 2.973 max6441utc, max6442utc 2.730 2.800 2.870 max6441utb, max6442utb 2.633 2.700 2.768 max6441uta, max6442uta 2.535 2.600 2.665 max6441utp, max6442utp 2.048 2.100 2.153 max6441uto, max6442uto 1.950 2.000 2.050 max6441utn, max6442utn 1.853 1.900 1.948 max6441utm, max6442utm 1.755 1.800 1.845 max6441utl, max6442utl 1.658 1.700 1.743 lth- threshold lth- max6441utk, max6442utk 1.560 1.600 1.640 v max6441utf, max6442utf 3.174 3.255 3.337 max6441ute, max6442ute 3.071 3.150 3.229 max6441utd, max6442utd 2.969 3.045 3.121 max6441utc, max6442utc 2.867 2.940 3.014 max6441utb, max6442utb 2.764 2.835 2.906 max6441uta, max6442uta 2.662 2.730 2.798 max6441utp, max6442utp 2.150 2.205 2.260 max6441uto, max6442uto 2.048 2.100 2.153 max6441utn, max6442utn 1.945 1.995 2.045 max6441utm, max6442utm 1.843 1.890 1.937 max6441utl, max6442utl 1.740 1.785 1.830 lth+ threshold lth+ max6441utk, max6442utk 1.638 1.680 1.722 v downloaded from: http:///
max6439?ax6442 low-power, single-/dual-level battery monitors with hysteresis and integrated ? reset 4 _______________________________________________________________________________________ electrical characteristics (continued)(v batt = 1.2v to 5.5v, v cc = 1.2v to 5.5v, t a = -40? to +85?, unless otherwise specified. typical values are at t a = +25?.) (note1) parameter symbol conditions min typ max units lbo , lbol , lboh , lbolh timeout period t lbop v batt rising above threshold 150 225 300 ms lbo , lbol , lboh , lbolh delay time t lbod v batt falling below threshold 100 ? (v batt or v cc ) 1.2v, i sink = 50?, asserted low 0.3 (v batt or v cc ) 1.6v, i sink = 100?, asserted low 0.3 (v batt or v cc ) 2.7v, i sink = 1.2ma, asserted low 0.3 lbo , lbol , lboh , lbolh output low(open drain) v ol (v batt or v cc ) 4.5v, i sink = 3.2ma, asserted low 0.3 v lbo , lbol , lboh , lbolh output open-drain leakagecurrent i lkg output deasserted 500 na max64_ _ _ _ _ _ t 3.000 3.075 3.150 max64_ _ _ _ _ _ s 2.850 2.925 3.000 max64_ _ _ _ _ _ r 2.550 2.625 2.700 max64_ _ _ _ _ _ z 2.250 2.313 2.375 max64_ _ _ _ _ _ y 2.125 2.188 2.250 max64_ _ _ _ _ _ w 1.620 1.665 1.710 v cc reset threshold v th max64_ _ _ _ _ _ v 1.530 1.575 1.620 v v cc reset hysteresis 0.3 % v cc to reset delay v cc falling at 10mv/? from (v th + 100mv) to (v th - 100mv) 50 ? max64_ _ _ _ _ _ _ d3 150 225 300 v cc to reset timeout period t rp max64_ _ _ _ _ _ _ d7 1200 1800 2400 ms v il 0.3 x v cc mr input voltage v ih 0.7 x v cc v mr minimum pulse width t mpw 1 s mr glitch rejection 100 ns mr to reset delay 200 ns mr reset timeout period t mrp 150 225 300 ms mr pullup resistance mr to v cc 750 1500 2250 ? mr rising debounce period t deb (note 3) 150 225 300 ms downloaded from: http:///
max6439?ax6442 low-power, single-/dual-level battery monitors with hysteresis and integrated ? reset _______________________________________________________________________________________ 5 electrical characteristics (continued)(v batt = 1.2v to 5.5v, v cc = 1.2v to 5.5v, t a = -40? to +85?, unless otherwise specified. typical values are at t a = +25?.) (note1) parameter symbol conditions min typ max units v cc 1.53v, i source = 100?, reset deasserted 0.8 x v cc reset output high (push-pull) v oh v cc 2.55v, i source = 500?, reset deasserted 0.8 x v cc v v cc 1.0v, i sink = 50?, reset asserted 0.3 v cc 1.2v, i sink = 100?, reset asserted 0.3 reset output low v ol v cc 2.12v, i sink = 1.2ma, reset asserted 0.3 v reset output leakage current (open drain) reset deasserted 500 na typical operating characteristics (v batt = 1.2v to 5.5v, v cc = 1.2v to 5.5v, unless otherwise specified. typical values are at t a = +25?.) supply current vs. temperature v cc = 3.3v, v batt = 3.6v max6439 toc01 temperature ( c) total i batt supply current ( a) 60 40 20 0 -20 1 2 3 40 -40 80 i cc normalized lbo timeout period vs. temperature max6439 toc02 temperature ( c) normalized lbo timeout period 60 40 20 0 -20 0.95 1.00 1.05 1.100.90 -40 80 normalized reset timeout period vs. temperature max6439 toc03 temperature ( c) normalized reset timeout period 60 40 20 0 -20 0.9900.985 1.0000.995 1.005 1.010 1.0150.980 -40 80 note 1: production testing done at t a = +25?; limits over temperature guaranteed by design only. note 2: the device is powered up by the highest voltage between v batt and v cc . note 3: mr input ignores falling input pulses, which occur within the mr debounce period (t deb ) after a valid mr reset assertion. this prevents invalid reset assertion due to switch bounce. downloaded from: http:///
max6439?ax6442 low-power, single-/dual-level battery monitors with hysteresis and integrated ? reset 6 _______________________________________________________________________________________ typical operating characteristics (continued) (v batt = 1.2v to 5.5v, v cc = 1.2v to 5.5v, unless otherwise specified. typical values are at t a = +25?.) 120110 100 9080 70 60 10 100 1000 maximum v batt transient duration vs. lth threshold overdrive max6439 toc04 lth threshold overdrive (mv) maximum v batt transient duration ( s) lbo asserts above this line 6055 50 45 40 35 30 25 20 10 100 1000 maximum v cc transient duration vs. v th threshold overdrive max6439 toc05 v th threshold overdrive (mv) maximum v cc transient duration ( s) reset asserts above this line normalized upper (hth) and lower (lth) trip voltages vs. temperature max6439 toc06 temperature ( c) normalized trip voltages 60 40 20 0 -20 0.975 1.000 1.025 1.0500.950 -40 80 lower trip voltage upper trip voltage normalized reset threshold vs. temperature max6439 toc07 temperature ( c) normalized reset threshold 60 40 20 0 -20 0.975 1.000 1.025 1.0500.950 -40 80 lbo output vs. sink current v cc = 3.3v, v batt = 2.1v max6439 toc08 i sink (ma) lbo output (mv) 8 6 4 2 20 40 60 80 100 120 0 01 0 lbo asserted reset output vs. sink current v cc = 2.1v, v batt = 3.6v max6439 toc09 i sink (ma) reset output (mv) 8 6 4 2 20 40 60 80 100 120 140 0 01 0 reset asserted reset output vs. source current v cc = 3.3v, v batt = 3.6v max6439 toc10 i source (ma) reset output (v) 3.0 2.5 2.0 1.5 1.0 0.5 2.75 3.00 3.25 3.502.50 03 . 5 downloaded from: http:///
detailed description the max6439?ax6442 family is available with severalmonitoring options. the factory-trimmed thresholds eliminate the requirement for external components. the max6439/max6440 have single low-battery outputs and the max6441/max6442 have dual low-battery out- puts (see figure 1a and figure 1b). the max6439?ax6442 combine a 1.23v reference with two comparators, logic, and timing circuitry to pro- vide the user with information about the charge state of the power-supply batteries. the max6441/max6442 monitor separate high-voltage and low-voltage thresh-olds to determine battery status. the output(s) can be used to signal when the battery is charged, when the battery is low, and when the battery is empty. factory- trimmed thresholds are ideal for monitoring single-cell li+ or multicell alkaline/nicd/nimh power supplies. when the power-supply voltage drops below the speci- fied low threshold, the low-battery output asserts. when the voltage rises above the specified high threshold fol- lowing a 150ms (min) timeout period, the low-battery output is deasserted. this ensures the supply voltage max6439?ax6442 low-power, single-/dual-level battery monitors with hysteresis and integrated ? reset _______________________________________________________________________________________ 7 pin description pin max6439/ max6440 max6441/ max6442 name function 11v batt battery voltage input. input for battery voltage threshold monitors and device power supplyif v batt is greater than v cc . 23 mr manual reset input, active-low, internal 1.5k ? pullup to v cc . pull low to assert a one-shot edge-triggered reset output for the mr reset timeout period. leave unconnected or connect to v cc if unused. the mr input is debounced for mr rising edges to prevent false reset events. 3 lbo low-battery output, active low, open drain. lbo is asserted when v batt drops below the lth specification and remains asserted until v batt rises above the hth specification for at least 150ms. 45 reset reset output, active low, push-pull or open drain. reset changes from high to low when the v cc input drops below the selected reset threshold and remains low for the v cc reset timeout period after v cc exceeds the reset threshold. reset is one-shot edge-trigger pulsed low for the mr reset timeout period when the mr input is pulled low. reset is an open-drain output for the max6439/max6441, and a push-pull output for themax6440/max6442. the push-pull outputs are referenced to v cc . reset is guaranteed to be in the correct logic state for v batt or v cc > 1.0v. 5 2 gnd ground 68v cc v cc voltage input. input for v cc reset threshold monitor and device power supply if v cc is greater than v batt . ? lboh low-battery output high, active low, open drain. lboh is asserted when v batt drops below the hth- specification. lboh is deasserted when v batt rises above the hth+ specification for at least 150ms. ? lbol low-battery output low, active low, open drain. lbol is asserted when v batt drops below the lth- specification. lbol is deasserted when v batt rises above the lth+ specification for at least 150ms. ? lbolh low-battery output low/high, active low, open drain. lbolh is asserted when v batt drops below the lth- specification. lbolh is deasserted when v batt rises above the hth+ specification for at least 150ms. downloaded from: http:///
max6439?ax6442 has stabilized before power-converter or microproces-sor activity is enabled. these devices also have an independent ? supervisor that monitors v cc and provides an active-low reset out- put. a manual reset function is available to allow theuser to reset the ? with a push-button. low-battery output the low-battery outputs are available in active-low( lbo , lbol , lboh , lbolh ), open-drain configura- tions. the low-battery outputs can be pulled to a volt-age independent of v cc or v batt , up to 5.5v. this allows the device to monitor and operate from directbattery voltage while interfacing to higher voltage microprocessors. the max6439/max6440 single-output voltage monitors provide a single low-battery output, lbo . these fixed- threshold devices assert lbo when v batt drops below v lth and remain asserted for at least 150ms after v batt rises above v hth (see figure 2). the max6441/ max6442 triple-output voltage monitors provide three low-battery outputs: lboh , lbol , and lbolh . lboh asserts when v batt drops below v hth- and remains asserted for at least 150ms after v batt rises above v hth+ . lbol asserts when v batt drops below v lth- and remains asserted for at least 150ms after v batt rises above v lth+ . lbolh asserts when v batt drops below v lth- and remains asserted for at least 150ms after v batt rises above v hth+ (see figure 3). for fast- rising v batt input, the lbol timeout period must com- plete before the lboh / lbolh timeout period begins. reset output the max6439?ax6442 provide an active-low resetoutput ( reset ). reset is asserted when the voltage at v cc falls below the reset threshold level. reset remains asserted for the reset timeout period after v cc exceeds the threshold. if v cc goes below the reset threshold before the reset timeout period is completed, the inter-nal timer restarts. the max6439/max6441 have open- drain reset outputs, while the max6440/max6442 have push-pull reset outputs (see figure 4). low-power, single-/dual-level battery monitors with hysteresis and integrated ? reset 8 _______________________________________________________________________________________ 5% hyst lth detect v th detect 5% hyst hth detect v batt v cc 1.23v lbo timeout period reset timeout period v cc lbollboh lbolh reset mr max6441 figure 1b. functional diagram max6440 lth detect hth detect r s q lbo timeout period reset timeout period v th detect v cc v cc v batt lbo reset v cc 1.23v q mr figure 1a. functional diagram downloaded from: http:///
max6439?ax6442 low-power, single-/dual-level battery monitors with hysteresis and integrated ? reset _______________________________________________________________________________________ 9 lbo lth hth v batt t lbop t lbod t lbop figure 2. single low-battery output timing mr gnd reset t rp t mrp gnd t mrp t deb t mpw t mpw t deb switch bounce switch bounce switch bounce switch bounce v th v cc gnd figure 4. reset timing diagram lbol lboh lth- lth+ hth- hth+ v batt t lbop t lbop t d t lbop t lbop lbolh t d figure 3. dual low-battery output timing downloaded from: http:///
max6439?ax6442 manual reset many microprocessor-based products require manualreset capability, allowing the operator, a test technician, or external logic circuitry to initiate a reset while the monitored supplies remain above their reset thresholds. these devices have a dedicated active-low mr pin. when mr is pulled low, reset asserts a one-shot low pulse for the mr reset timeout period. the mr input has an internal 1.5k ? pullup resistor to v cc and can be left unconnected if not used. mr can be driven with cmos- logic levels, open-drain/open-collector outputs, or amomentary push-button switch to gnd (the mr function is internally debounced for the t deb timeout period) to create a manual reset function. if mr is driven from long cables, or if the device is used in a noisy environment,connect a 0.1? capacitor from mr to gnd to provide additional noise immunity (see figure 4). hysteresis hysteresis increases the comparator? noise margin byincreasing the upper threshold or decreasing the lower threshold. the hysteresis prevents the output from oscillating (chattering) when v batt is near the low-bat- tery threshold. this is especially important for applica-tions where the load on the battery creates significant fluctuations in battery voltages (see figure 5). applications information li+ battery charger application the max6441/max6442 dual-output battery monitorscan be used in conjunction with a battery charger to provide a system with additional information about the battery charge state. many battery chargers, such as the max1879, provide the user with a chg output, which tells the system when the battery is charged. themax6441/max6442 dual-output battery monitors pro- vide three outputs, which can be used to relay the bat- tery condition to the system. this information is useful in determining which system resources can be powered by the battery at the current charge state (see figure 6). low-power, single-/dual-level battery monitors with hysteresis and integrated ? reset 10 ______________________________________________________________________________________ v batt lbo t lbop v hth v lth v hyst hth = battery voltage good, enable operation. lth = battery voltage low, suspend/disable operation. figure 5. hysteresis batt gnd 1-cellli+ battery therm adj gate pulse-width select input chg led thermistor in max1879 max6441max6442 tsel gnd lbol lbolh reset lboh v batt v cc current- limited ac wall adapter in out shdn dc/dc converter figure 6. li+ charger application (using max1879) dc/dc shdn mr v batt reset max6441max6442 nmireset p v cc gnd gnd v cc li+ 3.6v lbol lboh out in figure 7. dc-to-dc converter application downloaded from: http:///
dc-to-dc converter application the max6441/max6442 triple-output battery monitorscan be used in conjunction with a dc-to-dc converter to power microprocessor systems using a single li+ cell or two to three alkaline/nicd/nimh cells. the lboh output indicates that the battery voltage is weak, and isused to warn the microprocessor of potential problems. armed with this information, the microprocessor can reduce system power consumption. the lbol output indicates the battery is empty, and system power should be disabled. by connecting lbol to the shdn pin of the dc-to-dc converter, power to the microproces-sor is removed. microprocessor power does not return until the battery has recharged to a voltage greater than v lth+ (see figure 7). max6439?ax6442 low-power, single-/dual-level battery monitors with hysteresis and integrated ? reset ______________________________________________________________________________________ 11 upper threshold (hth) voltages 3.3v 3.4v 3.5v 3.6v 2.6v ag ah ai aj 2.7v bg bh bi bj 2.8v cg ch ci cj 2.9v dg dh di dj 3.0v eg eh ei ej lower threshold (lth) 3.1v fg fh fi fj table 1. factory-trimmed lower and upper threshold combinations for single-cell li+or three-cell alkaline/nicd/nimh applications upper threshold (hth) voltages 2.3v 2.4v 2.5v 2.6v 1.6v kq kr ks kt 1.7v lq lr ls lt 1.8v mq mr ms mt 1.9v nq nr ns nt 2.0v oq or os ot lower threshold (lth) 2.1v pq pr ps pt table 2. factory-trimmed lower and upper threshold combinations for two-cellalkaline/nicd/nimh applications part no. suffix ( _ ) v cc nominal reset threshold (v) t 3.075 s 2.925 r 2.625 z 2.313 y 2.188 w 1.665 v 1.575 table 3. factory-trimmed v cc reset threshold levels active timeout period (ms) timeout period suffix min max d3 150 300 d7 1200 2400 table 4. v cc reset timeout period suffix guide downloaded from: http:///
max6439?ax6442 low-power, single-/dual-level battery monitors with hysteresis and integrated ? reset 12 ______________________________________________________________________________________ part open-drain reset push-pull reset single low- battery output dual low-battery output max6439 x x max6440 x x max6441 x x max6442 x x selector guide part top mark max6439utdhrd3 abmn max6439utdhsd3 abmo MAX6439UTEHRD3 abmp max6439utehsd3 abmq max6439uteird3 abmr max6439uteisd3 abms max6440utdhrd3 abmt max6440utdhsd3 abmu max6440utehrd3 abmv max6440utehsd3 abmw max6440uteird3 abmx max6440uteisd3 abmy max6441kadhrd3 aeei max6441kadhsd3 aeej max6441kaehrd3 aeek max6441kaehsd3 aeel max6441kaeird3 aeem max6441kaeisd3 aeen max6442kadhrd3 aeeo max6442kadhsd3 aeep max6442kaehrd3 aeeq max6442kaehsd3 aeer max6442kaeird3 aees max6442kaeisd3 aeet standard versions table chip information transistor count: 1478process: bicmos dc/dc mrv batt max6439max6440 nmireset p v cc li+ 3.6v reset lbo v cc gnd gnd typical application circuit lboh reset lbolh 12 8 7 lbol gnd mr v batt sot23-8 top view 3 4 6 5 max6441max6442 v cc pin configurations (continued) downloaded from: http:///
max6439?ax6442 low-power, single-/dual-level battery monitors with hysteresis and integrated ? reset ______________________________________________________________________________________ 13 6lsot.eps package outline, sot 6l body 21-0058 1 1 g package information (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 .) downloaded from: http:///
max6439?ax6442 low-power, single-/dual-level battery monitors with hysteresis and integrated ? reset 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. 14 ____________________maxim integrated products, 120 san gabriel drive, sunnyvale, ca 94086 408-737-7600 2005 maxim integrated products printed usa is a registered trademark of maxim integrated products, inc. sot23, 8l .eps rev. document control no. approval proprietary information title: 3.00 2.60 e c e1 e between 0.08mm and 0.15mm from lead tip. 8. meets jedec mo178. 8 0.60 1.75 0.30 l2 0 e1 e l 1.50 e1 0.65 bsc.1.95 ref. 0.25 bsc. gauge plane seating plane c c l pin 1 i.d. dot (see note 6) l c l c a2 e1 d detail "a" 5. coplanarity 4 mils. max. note: 7. solder thickness measured at flat section of lead 6. pin 1 i.d. dot is 0.3 mm ? min. located above pin 1. 4. package outline inclusive of solder plating. 3. package outline exclusive of mold flash & metal burr. heel of the lead parallel to seating plane c. 2. foot length measured from lead tip to upper radius of 1. all dimensions are in millimeters. l2 l a1 a 0.45 1.30 0.15 1.45 max 0.28 b 0.90 a2 0.00 a1 0.90 a min symbol 3.00 0.20 2.80 d 0.09 c see detail "a" l c b e d 1 21-0078 1 package outline, sot-23, 8l body 0 0 package information (continued) (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 .) downloaded from: http:///

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