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general description the max6846?ax6849 are a family of ultra-low-power battery monitors with integrated microprocessor (p) supervisors. the user-adjustable battery monitors are offered with single 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 system operation), and when the battery is dead (to disable system operation). these devices also have an independent ? supervisor that monitors v cc and provides an active-low reset output. a manual reset function is available to reset the ? with a pushbutton. the max6846?ax6849 are ideal for single-cell lithium- ion (li+) or multicell alkaline/nicd/nimh applications. when the battery voltage drops below each adjusted low threshold, the low-battery outputs are asserted to alert the system. when the voltage rises above the adjusted high thresholds, the outputs are deasserted after a 150ms minimum timeout period, ensuring the voltages have stabilized before power circuitry is activated or pro- viding microprocessor reset timing. these devices have user-adjustable battery threshold voltages, providing a wide hysteresis range to prevent chattering that can result due to battery recovery after load removal. single low-battery outputs are supplied by the max6846/max6847 and dual low-battery out- puts are supplied by the max6848/max6849. all bat- tery monitors have open-drain low-battery outputs. the max6846?ax6849 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 max6846/ max6848 are offered with an open-drain reset output and the max6847/max6849 are offered with a push-pull reset output. the max6846?ax6849 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+ ormulticell nimh, nicd, alkaline) cell phones/cordless phones portable medical devices digital cameras pagers pdas mp3 players electronic toys features ? user-adjustable thresholds for monitoringsingle-cell li+ or multicell alkaline/nicd/nimh applications ? single and dual low-battery output options ? independent ? reset with manual reset ? factory-set reset thresholds for monitoring 1.8vto 3.3v systems ? available with 150ms (min) or 1.2s (min) v cc reset timeout period options ? 150ms (min) lbo timeout period ? immune to short-battery voltage transients ? low current (2.5?, typ at 3.6v) ? -40? to +85? operating temperature range ? small 8-pin sot23 packages max6846?ax6849 low-power, adjustable battery monitors with hysteresis and integrated ? reset ________________________________________________________________ maxim integrated products 1 top view mr reset lbo 12 8 7 v cc hthin gnd lthin v dd sot23 3 4 6 5 max6846max6847 12 8 7 v cc hthin gnd lthin v dd sot23 3 4 6 5 max6848max6849 lbol lboh reset pin configurations ordering information 19-2947; rev 1; 11/05 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 max6846 ka_d_-t -40? to +85? 8 sot23-8 max6847 ka_d_-t -40? to +85? 8 sot23-8 max6848 ka_d_-t -40? to +85? 8 sot23-8 max6849 ka_d_-t -40? to +85? 8 sot23-8 note: the first ??is the v cc reset threshold level, suffix found in table 1. the ??after the d is a placeholder for the resettimeout period suffix found in table 2. all devices are available in tape-and-reel only. there is a 2500 piece minimum order increment for standard versions (see standard versions table). sample stock is typically held on standard versions only. non- standard 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. downloaded from: http:///
max6846?ax6849 low-power, adjustable 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 dd , v cc to gnd ....................................................-0.3v to +6v* open-drain lbo , lboh , lbol 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) hthin, lthin to gnd................................-0.3v to (v dd + 0.3v) mr to gnd .................................................-0.3v to (v cc + 0.3v) input/output current, all pins .............................................20ma continuous power dissipation (t a = +70?) 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 dd = 1.6v 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?.) (note 1) parameter symbol conditions min typ max units v dd operating voltage range v dd 1.6 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 dd supply current i cc + i dd v dd = 3.6v, v cc = 3.3v, no load (note 2) 2.5 7 a max6846/max6847 v dd thresholds hthin threshold v hth hthin rising, lbo is deasserted when hthin rises above v hth 600 615 630 mv lthin threshold v lth lthin falling, lbo is asserted when lthin falls below v lth 600 615 630 mv max6848/max6849 v dd thresholds hthin+ threshold v hth+ hthin rising, lboh is deasserted when hthin rises above v hth+ 600 615 630 mv hthin- threshold v hth- hthin falling, lboh is asserted when hthin falls below v hth- 567 582 597 mv lthin+ threshold v lth+ lthin rising, lbol is deasserted when lthin rises above v lth+ 600 615 630 mv lthin- threshold v lth- lthin falling, lbol is asserted when lthin falls below v lth- 567 582 597 mv max6846?ax6849 hthin/lthin leakage current i lkg v hthin or v lthin 400mv 20 na lbo , lbo l , lbo h ti m eout p er i od t lbop hthin/lthin rising above threshold 150 225 300 ms lbo , lbol , lboh delay time t lbod hthin/lthin falling below threshold 100 ? (v dd or v cc ) 1.2v, i sink = 50?, asserted low 0.3 (v dd or v cc ) 1.6v, i sink = 100?, asserted low 0.3 (v dd or v cc ) 2.7v, i sink = 1.2ma, asserted low 0.3 lbo , lbol , lboh output low v ol (v dd or v cc ) 4.5v, i sink = 3.2ma, asserted low 0.3 v downloaded from: http:///
max6846?ax6849 low-power, adjustable battery monitors with hysteresis and integrated ? reset _______________________________________________________________________________________ 3 electrical characteristics (continued)(v dd = 1.6v 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?.) (note 1) parameter symbol conditions min typ max units lbo , lbol , lboh output open-drain leakage current output deasserted 500 na max68_ _ _ _ t 3.000 3.075 3.150 max68_ _ _ _ s 2.850 2.925 3.000 max68_ _ _ _ r 2.550 2.625 2.700 max68_ _ _ _ z 2.250 2.313 2.375 max68_ _ _ _ y 2.125 2.188 2.250 max68_ _ _ _ w 1.620 1.665 1.710 v cc reset threshold v th max68_ _ _ _ v 1.530 1.575 1.620 v v cc reset hysteresis 0.3 % v cc to reset delay t rd v cc falling at 10mv/? from (v th + 100mv) to (v th - 100mv) 50 ? max68_ _ _ _ _ d3 150 225 300 v cc to reset timeout period t rp max68_ _ _ _ _ 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 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 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 dd 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:///
max6846?ax6849 low-power, adjustable battery monitors with hysteresis and integrated ? reset 4 _______________________________________________________________________________________ supply current vs. temperature max6846-49 toc01 temperature ( c) supply current ( a) 60 40 20 0 -20 1 2 3 40 -40 80 v cc = 3.3v, v dd = 3.6v total i dd i cc normalized lbo timeout period vs. temperature max6846-49 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 max6846-49 toc03 temperature ( c) normalized reset timeout period 60 40 20 0 -20 0.950 1.000 1.050 1.1000.900 -40 80 maximum v lth /v hth transient duration vs. threshold overdrive max6846-49 toc04 threshold overdrive (mv) maximum v lth /v hth transient duration ( s) 120 60 70 80 90 100 110 10 100 1000 lbo asserts above this line maximum v cc transient duration vs. threshold overdrive max6846-49 toc05 threshold overdrive (mv) maximum v cc transient duration ( s) 100 20 6030 40 50 70 80 90 10 100 1000 reset occurs above this line t ypical operating characteristics (v dd = 3.6v, v cc = 3.3v, unless otherwise specified. typical values are at t a = +25?.) downloaded from: http:///
max6846?ax6849 low-power, adjustable battery monitors with hysteresis and integrated ? reset _______________________________________________________________________________________ 5 normalized upper and lower lbo trip voltages vs. temperature max6846-49 toc06 temperature ( c) normalized lbo trip voltages 60 40 20 0 -20 0.975 1.000 1.025 1.0500.950 -40 80 normalized reset threshold vs. temperature max6846-49 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 max6846-49 toc08 i sink (ma) lbo output (mv) 8 6 4 2 20 40 60 80 100 120 0 01 0 v cc = v dd = 3.3v reset output vs. sink current max6846-49 toc09 i sink (ma) reset output (mv) 8 6 4 2 20 40 60 80 100 120 140 0 01 0 v cc = 2.1v, v dd = 3.6v reset output vs. source current max6846-49 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 0 3.5 v cc = 3.3v, v dd = 3.6v t ypical operating characteristics (continued) (v dd = 3.6v, v cc = 3.3v, unless otherwise specified. typical values are at t a = +25?.) downloaded from: http:///
max6846?ax6849 low-power, adjustable battery monitors with hysteresis and integrated ? reset 6 _______________________________________________________________________________________ detailed description the max6846?ax6849 family is available with severalmonitoring options. the max6846/max6847 have single low-battery outputs and the max6848/max6849 have dual low-battery outputs (see figures 1a and 1b). the max6846?ax6849 combine a 615mv 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 max6848/max6849 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. user- adjustable 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 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 pushbutton. pin description pin max6846/max6847 max6848/max6849 name function 11 v dd v dd supply. device power supply if v dd is greater than v cc . 22 gnd ground 33 lthin lth threshold monitor input. a resistor-divider network sets the low threshold associated with lbol and lbo . 4 lbo low-battery output, active-low, open-drain. lbo is asserted when lthin drops below the v lth specification and remains asserted until hthin rises above the v hth specification for at least 150ms. 55 reset reset output, active-low, push-pull, or open-drain. reset goes 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 max6846/max6848, and a push-pull output for themax6847/max6849. the push-pull outputs are referenced to v cc . reset is guaranteed to be in the correct logic state for v dd or v cc 10v. 6 mr manual reset input, active-low, internal 1.5k ? pullup to v cc . pull mr low to assert a one-shot reset output pulse 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. 77 hthin hth threshold monitor input. a resistor-divider network sets the highthreshold associated with lboh and lbo . 88 v cc v cc voltage input. input for v cc reset threshold monitor and device power supply if v cc is greater than v dd . ? lboh low-battery output high, active-low, open-drain. lboh is asserted when hthin drops below the v hth- specification. lboh is deasserted when hthin rises above the v hth+ specification for at least 150ms. ? lbol low-battery output low, active-low, open-drain. lbol is asserted when lthin drops below the v lth- specification. lbol is deasserted when lthin rises above the v lth+ specification for at least 150ms. downloaded from: http:///
max6846?ax6849 low-power, adjustable battery monitors with hysteresis and integrated ? reset _______________________________________________________________________________________ 7 5% hyst lth detect v th detect 5% hyst hth detect v dd l thin hthin v cc 615mv lbo timeout period reset timeout period lbollboh reset max6848 1.23v figure 1b. max6848 functional diagram max6847 lth detect hth detect r s q lbo timeout period reset timeout period v th detect v cc v cc v dd l thin hthin lbo reset v cc 615mv q mr 1.23v figure 1a. max6847 functional diagram low-battery output the low-battery outputs are available in active-low( lbo , lbol , lboh ), open-drain configurations. the low-battery outputs can be pulled to a voltage indepen-dent of v cc or v dd , up to 5.5v. this allows the device to monitor and operate from direct battery voltage whileinterfacing to higher voltage microprocessors. the max6846/max6847 single-output voltage monitors provide a single low-battery output, lbo . lbo asserts when lthin drops below v lth and remains asserted for at least 150ms after hthin rises above v hth (see figure 2). the max6848/max6849 dual-output voltagemonitors provide two low-battery outputs: lboh and lbol . lboh asserts when hthin drops below v hth- and remains asserted for at least 150ms after hthin rises above v hth+ . lbol asserts when lthin drops below v lth- and remains asserted for at least 150ms after lthin rises above v lth+ (see figure 3). for fast- rising v dd input, the lbol timeout period must com- plete before the lboh timeout period begins. reset output the max6846?ax6849 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 (see figure 4). the max6846/ max6848 have open-drain reset outputs, while the max6847/max6849 have push-pull reset outputs. downloaded from: http:///
max6846?ax6849 low-power, adjustable battery monitors with hysteresis and integrated ? reset 8 _______________________________________________________________________________________ lbo lth hth v monitored v triphigh v triplow v hyst = hysteresis lthin = 615mv hthin = 615mv t lbop t lbod t lbop v hyst 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 monitored t lbop t lbop t lbod t lbop t lbop t lbod (v triphigh +5%) (v triplow +5%) v triphigh v triplow v hyst = hysteresis v hyst = 5% lthin = 615mv lthin = 582mv hthin = 615mvhthin = 582mv v hyst = 5% figure 3. dual low-battery output timing downloaded from: http:///
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 pushbutton 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 monitor input is near the low-battery threshold. this is especially important for applications where the load on the battery creates sig- nificant fluctuations in battery voltages (see figures 2 and 3). for the max6846/max6847, hysteresis is set using three external resistors (see figure 5). the max6848/max6849 have dual, low-battery input levels. each input level has a 5% (typ) hysteresis. applications information resistor-value selection (programming the adjustable thresholds) max6846/max6847 use the following steps to determine values for r1, r2,and r3 of figure 5. 1) choose a value for r total , the sum of r1, r2, and r3. because the max6846/max6847 have very highinput impedance, r total can be up to 500k ? . 2) calculate r3 based on r total and the desired upper trip point: 3) calculate r2 based on r total , r3, and the desired lower trip point: 4) calculate r1 based on r total , r3, and r2: max6848/max6849 v lth- = v hth- = 582mv lbol low-trip level: lboh low-trip level: use the following steps to determine values for r1, r2,and r3 of figure 5. vv rr r r rr r r triphigh hth total = ++ ?? ? ?? ? =++ - 12 3 3 12 3 vv rr r rr triplow lth = ++ + ?? ? ?? ? - 12 3 23 rr rr total 12 3 = -- r mv r v r total triplow 2 615 3 = ?? ? ?? ? - r mv r v total triphigh 3 615 = vv m v vv rr r rr vv rrr r rr r r lth hth triplow lth triphigh hth total == = ++ + ?? ? ?? ? = ++ ?? ? ?? ? =++ 615 12 3 23 123 3 12 3 max6846?ax6849 low-power, adjustable battery monitors with hysteresis and integrated ? reset _______________________________________________________________________________________ 9 max6846max6847 max6848 max6849 v dd v dd lthin hthin gnd * for the max6846/max6847.( ) for the max6848/max6849. (lboh) (lbol) r1r2 r3 lbo* figure 5. adjustable threshold selection downloaded from: http:///
max6846?ax6849 low-power, adjustable battery monitors with hysteresis and integrated ? reset 10 ______________________________________________________________________________________ 1) choose a value for r total , the sum of r1, r2, and r3. because the max6848/max6849 have very highinput impedance, r total can be up to 500k ? . 2) calculate r3 based on r total and the desired upper trip point: 3) calculate r2 based on r total , r3, and the desired lower trip point: 4) calculate r1 based on r total , r3, and r2: 5) lbol high-trip level: v triplow ? 1.05 6) lboh high-trip level: v triphigh ? 1.05 monitoring multicell battery applications for monitoring multicell li+ (or a higher number of alka-line/nicd/nimh cells), connect v dd to a supply voltage between 1.6v to 5.5v. figure 6 shows v dd connected directly to v cc. to calculate the values of r1, r2, and r3, see the resistor-value selection section. dc-dc converter application the max6848/max6849 dual battery monitors can beused in conjunction with a dc-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 is usedto 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-dc converter, power to the microprocessor isremoved. microprocessor power does not return until the battery has recharged to a voltage greater than v lth+ (see figure 7). rr rr total 12 3 = -- r mv r v r total triplow 2 582 3 = ?? ? ?? ? - r mv r v total triphigh 3 582 = 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 1. factory-trimmed v cc reset threshold levels active timeout period (ms) timeout period suffix min max d3 150 300 d7 1200 2400 table 2. v cc reset timeout period suffix guide dc-dc shdn v dd reset max6848max6849 lthin hthin nmireset p v cc gnd gnd v cc li+ 3.6v lbol lboh out in figure 7. dc-dc converter application max6846max6847 max6848 max6849 v monitored v dd v cc v cc lthin hthin gnd * for the max6846/max6847.( ) for the max6848/max6849. (lboh) r1r2 r3 lbo* (lbol) figure 6. monitoring multicell li+ applications downloaded from: http:///
max6846?ax6849 low-power, adjustable battery monitors with hysteresis and integrated ? reset ______________________________________________________________________________________ 11 part open-drain reset push-pull reset single low- battery output dual low-battery output max6846 x x max6847 x x max6848 x x max6849 x x selector guide part top mark max6846kard3 aeji max6846kasd3 aejd MAX6846KAWD3 aejk max6846kazd3 aejj max6847kard3 aeje max6847kasd3 aejl max6847kawd3 aejn max6847kazd3 aejm max6848kard3 aejp max6848kasd3 aejo max6848kawd3 aejr max6848kazd3 aejq max6849kard3 aejt max6849kasd3 aejs max6849kawd3 aejv max6849kazd3 aeju standard versions table dc-dc mrv dd max6846max6847 nmireset p v cc li+ 3.6v reset lbo v cc gnd gnd lthin hthin t ypical application circuit chip information transistor count: 1478process: bicmos downloaded from: http:///
max6846?ax6849 low-power, adjustable 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. 12 ____________________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. 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 .) 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 downloaded from: http:///

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