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1 ltc1540 1540fa applicatio s u descriptio u features typical applicatio u nanopower comparator with reference v + r1 4.32m 1% r2 3m 1% 3.3v v 21 7 8 gnd out ltc1540 1540 ?ta01 in + in hyst ref 3 4 5 6 + temperature ( c) ?0 0.50 0.45 0.40 0.35 0.30 0.25 0.20 0.15 20 60 1540 ?ta02 ?0 0 40 80 100 supply current ( m a) v + = 5v v = gnd = 0v the ltc ? 1540 is an ultralow power, single comparator with built-in reference. the comparators features include less than 0.6 m a supply current over the commer- cial temperature range, a 1.182v 2% reference, pro- grammable hysteresis and ttl/cmos outputs that sink and source current. the reference output can drive a bypass capacitor of up to 0.01 m f without oscillation. the comparator operates from a single 2v to 11v supply or a dual 1v to 5.5v supply. comparator hysteresis is easily programmed by using two resistors and the hyst pin. each comparators input operates from the negative supply to within 1.3v of the positive supply. the compara- tor output stage can continuously source up to 40ma. by eliminating the cross-conducting current that normally occur when the comparator changes logic states, power supply glitches are eliminated. the ltc1540 is available in the 8-pin msop and so packages. for space limited applications, the ltc1540 is available in a 3mm x 3mm low profile (0.8mm) dual fine- pitch leadless package (dfn). nanopower 2.9v v cc threshold detector ltc1540 supply current vs temperature n ultralow quiescent current: 0.3 m a typ n reference output drives 0.01 m f capacitor n adjustable hysteresis n available in 3mm x 3mm x 0.8mm dfn package n wide supply range: 2v to 11v n input voltage range includes the negative supply n reference output sources up to 1ma n ttl/cmos compatible outputs n 60 m s propagation delay with 10mv overdrive n no crowbar current n 40ma continuous source current n pin compatible with ltc1440, max921, max931 , ltc and lt are registered trademarks of linear technology corporation. n battery-powered system monitoring n threshold detectors n window comparators n oscillator circuits
2 ltc1540 1540fa voltage v + to v C , v + to gnd, gnd to v C ...........12v to C 0.3v in + , in C , hyst ................. (v + + 0.3v) to (v C C 0.3v) ref ................................... (v + + 0.3v) to (v C C 0.3v) out ............................... (v + + 0.3v) to (gnd C 0.3v) current in + , in C , hyst ................................................. 20ma ref ................................................................... 20ma out .................................................................. 50ma absolute m axi m u m ratings w ww u out short-circuit duration (v + 5.5v) ...... continuous power dissipation ............................................. 500mw operating temperature range ltc1540c .............................................. 0 c to 70 c ltc1540i ............................................ C 40 c to 85 c storage temperature range ................ C 65 c to 150 c (dd package) ................................... C 65 c to 125 c lead temperature (soldering, 10 sec).................. 300 c package/order i n for m atio n w uu ltc1540cms8 ltc1540cims8 ms8 part marking t jmax = 150 c, q ja = 175 c/ w 1 2 3 4 8 7 6 5 top view out v + ref hyst gnd v in + in s8 package 8-lead plastic so 1 2 3 4 gnd v in + in 8 7 6 5 out v + ref hyst top view ms8 package 8-lead plastic msop t jmax = 150 c, q ja = 250 c/ w order part number s8 part marking order part number ltce ltadv ltc1540cs8 ltc1540is8 1540 1540i top view dd package 8-lead (3mm 3mm) plastic dfn 5 6 7 8 4 3 2 1 gnd v in + in out v + ref hyst t jmax = 125 c, q ja = 160 c/ w (note 3) order part number ltc1540cdd ltc1540idd dd part marking* consult ltc marketing for parts specified with wider operating temperature ranges. *temperature grades are identified by a label on the shipping container. the l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at t a = 25 c.v + = 5v, v C = gnd = 0v, t a = 25 c unless otherwise noted. electrical characteristics symbol parameter conditions min typ max units power supply v + supply voltage range l 2.0 11.0 v i cc supply current in + = in C = 80mv, hyst = ref, c-grade l 0.3 0.68 m a in + = in C = 80mv, hyst = ref, i-grade l 0.71 m a comparator v os comparator input offset voltage v cm = 2.5v 12 mv l 15 mv ltc1540cms8/ims8 l 16 mv i in input leakage current (in + , in C )v in + = v in C = 2.5v l 0.01 1.0 na input leakage current (hyst) l 0.02 1.0 na v cm comparator input common mode range l v C v + C 1.3v v cmrr common mode rejection ratio v C to v + C 1.3v 0.1 1 mv/v psrr power supply rejection ratio v + = 2v to 11v 0.1 1 mv/v laas
3 ltc1540 1540fa v + = 5v, v C = gnd = 0v, t a = 25 c unless otherwise noted. electrical characteristics v + = 3v, v C = gnd = 0v, t a = 25 c unless otherwise noted. symbol parameter conditions min typ max units v hyst hysteresis input voltage range l ref C 50mv ref v t pd propagation delay c out = 100pf overdrive = 10mv 60 m s overdrive = 100mv 50 m s v oh output high voltage i o = C 13ma l v + C 0.4v v v ol output low voltage i o = 1.8ma l gnd + 0.4v v reference v ref reference voltage no load (so-8)/(dfn) commercial l 1.158 1.182 1.206 v ms8 commercial l 1.156 1.182 1.208 v (so-8)(ms8)/(dfn) industrial l 1.152 1.182 1.212 v d v ref load regulation 0 i source 100 m a l 0.5 2.5 mv 0 i sink 10 m a 0.5 1.5 mv l 5mv symbol parameter conditions min typ max units power supply v + supply voltage range l 211v i cc supply current in + = in C = 80mv, hyst = ref, c-grade l 0.28 0.61 m a in + = in C = 80mv, hyst = ref, i-grade l 0.64 m a comparator v os comparator input offset voltage v cm = 2.5v 12 mv l 15 mv ltc1540cms8/ims8 l 16 mv i in input leakage current (in + , in C )v in + = v in C = 1.5v l 0.01 1na input leakage current (hyst) l 0.02 1na v cm comparator input common mode range l v C v + C 1.3v v cmrr common mode rejection ratio v C to v + C 1.3v 0.1 1 mv/v psrr power supply rejection ratio v + = 2v to 11v 0.1 1 mv/v v hyst hysteresis input voltage range l ref C 50mv ref v t pd propagation delay c out = 100pf overdrive = 10mv 70 m s overdrive = 100mv 60 m s v oh output high voltage i o = C 8ma l v + C 0.4v v v ol output low voltage i o = 0.8ma l gnd + 0.4v v reference v ref reference voltage no load (so-8)/(dfn) commercial l 1.158 1.182 1.206 v ms8 commercial l 1.156 1.182 1.208 v (so-8)(ms8)/(dfn) industrial l 1.152 1.182 1.212 v d v ref load regulation 0 i source 100 m a l 0.75 3.5 mv 0 i sink 10 m a 0.5 1.5 mv l 5mv note 1: absolute maximum ratings are those values beyond which the life of a device may be impaired. note 2: the q ja specified for the dd package is with minimal pcb heat spreading metal. using expanded metal area on all layers of a board reduces this value.
4 ltc1540 1540fa typical perfor m a n ce characteristics uw temperature ( c) ?0 0 supply current ( m a) 0.2 0.5 ?0 20 40 1540 g01 0.1 0.4 0.3 ?0 0 60 80 100 v + = 5v v = gnd = 0v v + = 2v v = gnd = 0v v + = 3v v = gnd = 0v supply current vs temperature reference voltage load regulation (source) output source current (ma) 0 0 d v ref (mv) 2 5 1 2 1540 g04 1 4 3 3 4 v + = 5v v = gnd = 0v t a = 25 c comparator short-circuit current vs supply voltage supply voltage (v) 0 current (ma) 120 160 200 8 1540 g07 80 40 100 140 180 60 20 0 2 4 6 19 3 5 7 10 t a = 25 c output connected to v = gnd = 0v; source current output connected to v + ; sink current v ref ?v hyst (mv) 0 differential input voltage (v) 80 60 40 20 0 ?0 ?0 ?0 ?0 40 1540 g09 10 20 30 50 hysteresis control comparator output voltage (low) vs load current load current (ma) 0 0 output voltage (v) 1.0 2.5 20 40 1540 g06 0.5 2.0 1.5 60 80 10 30 50 70 t a = 25 c v + = 5v v + = 3v v + = 2v reference voltage load regulation (sink) output sink current ( m a) 0 0 d v ref (mv) 1 3 4 5 10 7 10 20 25 1540 g03 2 8 9 6 515 30 35 40 v + = 5v v = gnd = 0v t a = 25 c temperature ( c) ?0 reference voltage (v) 1.182 1.184 1.186 80 100 1540 g02 1.180 1.178 1.172 ?0 020 ?0 40 60 1.174 1.176 1.190 1.188 v + = 5v v = gnd = 0v reference voltage vs temperature comparator output voltage (high) vs load current load current (ma) 0 0 output voltage (v) 2 5 20 40 1540 g05 1 4 3 60 80 10 30 50 70 t a = 25 c v + = 5v v + = 3v v + = 2v comparator response time vs input overdrive input voltage (mv) time ( m s) 60 70 80 80 1540 g08 50 40 55 65 75 45 35 30 20 40 60 10 90 30 50 70 100 110 t a = 25 c v + = 5v v = gnd = 0v t plh t phl
5 ltc1540 1540fa pi n fu n ctio n s uuu v + (pin 7): positive supply operating voltage is from 2v to 11v. out (pin 8): comparator cmos output. swings from gnd to v + . output can source up to 40ma and sink 5ma. gnd (pin 1): ground. connect to v C for single supply operation. v C (pin 2): negative supply. potential should be more negative than gnd. connect to ground for single supply operation. in + (pin 3) : noninverting comparator input. input com- mon mode range from v C to v + C 1.3v. input current typically 10pa at 25 c. in C (pin 4): inverting comparator input. input common mode range from v C to v + C 1.3v. input current typically 10pa at 25 c. hyst (pin 5): hysteresis input. connect to ref if not used. input voltage range is from v ref to v ref C 50mv. ref (pin 6): reference output. 1.182v with respect to v C . can source up to 1ma and sink 10 m a at 25 c. drive 0.01 m f bypass capacitor without oscillation. 1540 ?pd 1 2 3 4 8 7 6 5 in + in hyst ref v + out + v gnd ltc1540 the ltc1540 is a nanopower comparator with a built-in 1.182v reference. features include programmable hyster- esis, wide supply voltage range (2v to 11v) and the ability of the reference to drive up to a 0.01 m f capacitor without oscillation. the comparators cmos outputs can source up to 40ma while supply current glitches that normally occur when switching logic states, have been eliminated. power supplies the comparator operates from a single 2v to 11v supply. the ltc1540 includes a separate ground for the compara- tor output stage, allowing a split supply ranging from 1v to 5.5v. connecting v C to gnd will allow single supply operation. if the comparator output is required to source more than 1ma, or the supply source impedance is high, v + should be bypassed with a 0.1 m f capacitor. comparator inputs the comparator inputs can swing from the negative supply, v C , to within 1.3v (max) of the positive supply v + . the inputs can be forced 300mv below v C or above v + without damage and the typical input leakage current is only 10pa. applicatio n s i n for m atio n wu u u comparator output the comparator output swings between gnd and v + to assure ttl compatibility with a split supply. the output is capable of sourcing up to 40ma and sinking up to 5ma while still maintaining nanoampere quiescent currents. the output stage does not generate crowbar switching currents during transitions which helps minimize parasitic feedback through the supply pins. voltage reference the internal bandgap reference has a voltage of 1.182v referenced to v C . the reference accuracy is 2.0% from 0 c to 70 c. it can source up to 1ma and sink up to 10 m a with a 5v supply. the reference can drive a bypass capacitor of up to 0.01 m f without oscillation and by inserting a series resistor, capacitance values up to 10 m f can be used (figure 1). figure 2 shows the resistor value required for different capacitor values to achieve critical damping. bypassing the reference can help prevent false tripping of the com- parators by preventing glitches on v + or reference load transients from disturbing the reference output voltage.
6 ltc1540 1540fa applicatio n s i n for m atio n wu u u v + r1 430 w r2 10k c1 1 m f 5v to 8v out v 21 7 8 gnd ltc1540 1540 ?f03a in + in hyst ref 3 4 5 6 r3 2.4m + ltc1540 v ref r1 c1 reference output 1540 ?f01 figure 1. damping the reference output figure 2. damping resistance vs bypass capacitor value figure 3 shows the bypassed reference output with a square wave applied to the v + pin. resistors r2 and r3 set 10mv of hysteresis voltage band while r1 damps the reference response. note that the comparator output doesnt trip. low voltage operation: v + = 1.6v the guaranteed minimum operating voltage is 2v (or 1v). as the total supply voltage is reduced below 2v, the performance degrades and the supply current falls. at low supply voltages, the comparators output drive is reduced and the propagation delay increases. the v ref and v os are also slightly worse. the useful input voltage range extends from the negative supply to 0.9v below the positive supply. test your prototype over the full temperature and supply voltage range if operation below 2v is anticipated. because of the increase in supply current, operation below 1.5v is not recommended (figure 4). figure 4. supply current vs supply voltage supply voltage (v) 0 supply current ( m a) 3 4 5 2.0 1540 f04 2 1 0 0.5 1.0 1.5 2.5 v = gnd = 0v in + = 0v in = ref = hyst t a = 25 c figure 3a. power supply transient test circuit capacitor value ( f) 0.001 0.1 resistor value (k ) 10 1000 0.01 0.1 10 1 1540 ?f02 1 100 figure 3b. power supply transient rejection 2mv/div 2ms/div 1540 f03b 8v v + 5v v ref out
7 ltc1540 1540fa applicatio n s i n for m atio n wu u u hysteresis hysteresis can be added to the ltc1540 by connecting a resistor (r1) between the ref and hyst pins and a second resistor (r2) from hyst to v C (figure 5). the difference between the upper and lower threshold voltages, or hysteresis voltage band (v hb ), is equal to twice the voltage difference between the ref and hyst pins. when more hysteresis is added, the upper threshold increases the same amount as the low threshold de- creases. the maximum voltage allowed between ref and hyst pins is 50mv, producing a maximum hysteresis voltage band of 100mv. the hysteresis band may vary by up to 15%. if hysteresis is not wanted, the hyst pin should be shorted to ref. acceptable values for i ref range from 0.1 m a to 5 m a. if 2.4m is chosen for r2, then the value of r1 (k w ) is equal to the value of v hb (mv). 6 r2 hyst v ref 5 r1 1540 ?f05 ltc1540 2 i ref r1 = v hb (2)(i ref ) r2 = i ref 1.182v () v hb 2 figure 5. programmable hysteresis figure 6. glitch-free level detector with hysteresis typical applicatio n s u level detector the ltc1540 is ideal for use as a nanopower level detector as shown in figure 6. r1 and r2 form a voltage divider from v in to the noninverting comparator input. r3 and r4 set the hysteresis voltage, and r5 and c1 bypass the reference output. the following design procedure can be used to select the component values: 1. choose the v in voltage trip level, in this example 4.65v. 2. calculate the required resistive divider ratio. ratio = v ref /v in ratio = 1.182v/4.65v = 0.254 3. choose the required hysteresis voltage band at the input v hbin , in this example 60mv. calculate the hyster- esis voltage band referred to the comparator input v hb . v hb = (v hbin )(ratio) v hb = (60mv)(0.254) v hb = 15.24mv 4. choose the values for r3 and r4 to set the hysteresis. r4 = 2.4m r3 (k w ) = 15k, v hb (mv) = 15mv 5. choose the values for r1 and r2 to set the trip point. r1 = r2 = r1 ?1 = = 1.18m v ref i bias v ref + v in v hb 2 1.182v 1 m a r2 = 1.18m r2 = 3.40m ?1 1.182v + 4.65v 15mv 2 v + r5 430 w 5% r3 15k 1% c1 1 m f out v 21 7 5v v in 8 gnd ltc1540 1540 f06 in + in hyst ref 3 4 5 6 + r2 3.4m 1% r1 1.18m 1% r4 2.4m 1%
8 ltc1540 1540fa typical applicatio n s u 3.3v output low dropout linear regulator the ltc1540 can be connected as a micropower (i q = 5.5 m a at v in = 5v) low dropout linear regulator (figure 7). when the output is low, q1 turns on, allowing current to charge output capacitor c1. local feedback formed by r4, q1 and q2 creates a constant-current source from the 5v input to c1. r4, r1 and q2s v be also provide current limiting in the case of an output short-circuit to ground. c2 reduces output ripple, while the r2-r3 feedback voltage divider establishes the output voltage. auto power-off source figure 8 shows the circuit for a 30ma power supply that has a timed auto power-off function. the comparator output is the switched power supply output. with a 10ma load, it typically provides a voltage of (v bat C 0.17v). the whole circuit draws a mere 0.8 m a of quiescent current with v bat = 5v. the three resistor voltage divider programs 50mv of hysteresis for the comparator, and sets the in C voltage at 200mv. this gives an in + trip threshold of approximately 150mv the rc time constant determines the maximum power-on time of the out pin before power down occurs. this period can be approximated by: t = 4.6rc (seconds) the actual time will vary with both the leakage current of the capacitor and the input current at the in + pin. figure 7. 3.3v output low dropout linear regulator v + v 1 c3 2 7 8 r1 47k gnd out 1540 f07 in + in hyst ref 3 4 5 6 + r3 750k 1% r2 430k 1% r4 10 w q1 tp0610l v in = 5v q2 2n3906 c1 10 m f v out 3.3v c2 2.2nf ltc1540 v + in + out 432k v bat v 21 7 8 3 gnd cr (v bat ?0.17v) 10ma momentary switch ltc1540 1540 f08 in hyst ref 4 5 6 121k 2m + figure 8. auto power-off switch operates on 0.8 m a quiescent current
9 ltc1540 1540fa low-battery detect figure 9 shows how to use the ltc1540 for a low-battery detect, drawing only 1.4 m a at v bat = 2v. the circuit is powered by a 2-cell nicd battery. the v bat pin could be as low as 1.6v when the batteries are completely depleted. the electrical specifications of the ltc1540 guarantee operation down to a supply voltage of 2v, but it is still functional with the supply as low as 1.6v. some param- eters, such as v ref and v os , will be degraded on lower supply voltages. the input voltage range extends from 0.9v below the positive supply to the negative supply. typical applicatio n s u figure 9. low-battery detect works down to 1.6v v + r1 3m r2 1.1m v bat = ~1.6v to 2.5v v 21 7 8 out gnd lbo 2-cell nicd ltc1540 1540 f09 in + in ref hyst 3 4 6 5 + r3 40k r4 1.2m r5 1m
10 ltc1540 1540fa package descriptio n u 3.00 0.10 (4 sides) note: 1. drawing to be made a jedec package outline m0-229 variation of (weed-1) 2. all dimensions are in millimeters 3. dimensions of exposed pad on bottom of package do not include mold flash. mold flash, if present, shall not exceed 0.15mm on any side 4. exposed pad shall be solder plated 0.38 0.10 bottom view?xposed pad 1.65 0.10 (2 sides) 0.75 0.05 r = 0.115 typ 2.38 0.10 (2 sides) 1 4 8 5 pin 1 top mark 0.200 ref 0.00 ?0.05 (dd8) dfn 0203 0.28 0.05 2.38 0.05 (2 sides) recommended solder pad pitch and dimensions 1.65 0.05 (2 sides) 2.15 0.05 0.50 bsc 0.675 0.05 3.5 0.05 package outline 0.28 0.05 0.50 bsc ms8 package 8-lead plastic msop (reference ltc dwg # 05-08-1660) dd package 8-lead plastic dfn (3mm 3mm) (reference ltc dwg # 05-08-1698) msop (ms8) 0802 0.53 0.015 (.021 .006) seating plane note: 1. dimensions in millimeter/(inch) 2. drawing not to scale 3. dimension does not include mold flash, protrusions or gate burrs. mold flash, protrusions or gate burrs shall not exceed 0.152mm (.006") per side 4. dimension does not include interlead flash or protrusions. interlead flash or protrusions shall not exceed 0.152mm (.006") per side 5. lead coplanarity (bottom of leads after forming) shall be 0.102mm (.004") max 0.18 (.077) 0.254 (.010) 1.10 (.043) max 0.22 ?0.38 (.009 ?.015) typ 0.13 0.076 (.005 .003) 0.86 (.034) ref 0.65 (.0256) bsc 0 ?6 typ detail ? detail ? gauge plane 12 3 4 4.90 0.15 (1.93 .006) 8 7 6 5 3.00 0.102 (.118 .004) (note 3) 3.00 0.102 (.118 .004) note 4 0.52 (.206) ref 5.23 (.206) min 3.2 ?3.45 (.126 ?.136) 0.889 0.127 (.035 .005) recommended solder pad layout 0.42 0.04 (.0165 .0015) typ 0.65 (.0256) bsc
11 ltc1540 1540fa package descriptio n u information furnished by linear technology corporation is believed to be accurate and reliable. however, no responsibility is assumed for its use. linear technology corporation makes no represen- tation that the interconnection of its circuits as described herein will not infringe on existing patent rights. s8 package 8-lead plastic small outline (narrow .150 inch) (reference ltc dwg # 05-08-1610) .016 ?.050 (0.406 ?1.270) .010 ?.020 (0.254 ?0.508) 45 0 ?8 typ .008 ?.010 (0.203 ?0.254) so8 0303 .053 ?.069 (1.346 ?1.752) .014 ?.019 (0.355 ?0.483) typ .004 ?.010 (0.101 ?0.254) .050 (1.270) bsc 1 2 3 4 .150 ?.157 (3.810 ?3.988) note 3 8 7 6 5 .189 ?.197 (4.801 ?5.004) note 3 .228 ?.244 (5.791 ?6.197) .245 min .160 .005 recommended solder pad layout .045 .005 .050 bsc .030 .005 typ inches (millimeters) note: 1. dimensions in 2. drawing not to scale 3. these dimensions do not include mold flash or protrusions. mold flash or protrusions shall not exceed .006" (0.15mm)
12 ltc1540 1540fa lt/tp 0403 1k rev a ? printed in usa ? linear technology corporation 1997 typical applicatio n u rf field detector figure 10 shows the complete circuit for a field detector which was tested at 445mhz. a transmission line is used to match the detector diode (1n5712) to a quarter-wave whip antenna. the 0.23 l wavelength transmission line section transforms the 1pf (350 w ) diode junction capaci- tance to a virtual short at the base of the antenna. at the same time it converts the received antenna current to a voltage loop at the diode, giving excellent sensitivity. figure 10. nanopower field detector + ltc1540 2v to 11v 2 1540 f10 10nf 0.23 l 1n5712 10nf 12m 180k l /4 10k fb 7 6 5 8 3 4 1 q q cmos one shot (cd4047) part number description comments lt ? 1178/lt1179 dual/quad 17 m a precision single supply op amps 70 m v max v os , 5na max i bias lt1351 single 250 m a, 3mhz, 200v/ m s op amp with shutdown c-load tm op amp stable driving any capacitive load lt1352/lt1353 dual/quad 250 m a, 3mhz, 200v/ m s op amps c-load op amps stable driving any capacitive load ltc1440 micropower comparator with 1% reference 1.182v 1% reference, 10mv (max) input offset ltc1443/ltc1444/ltc1445 micropower quad comparators with 1% reference ltc1443 has 1.182v reference, ltc1444/ltc1445 have 1.221v reference and adjustable hysteresis ltc1474 low quiescent current high efficiency 10 m a standby current, 92% efficiency, space saving 8-pin step-down converter msop package lt1495 1.5 m a max, dual precision rail-to-rail 375 m v max v os , 250pa i bias , 25pa i os input and output op amp lt1521 300ma low dropout regulator with micropower 0.5v dropout voltage, 12 m a quiescent current, adjustable quiescent current and shutdown output 3v, 3.3v and 5v fixed lt1634 micropower precision shunt voltage reference 1.25v, 2.5v, 4.096v, 5v outputs, 10 m a operating current, 0.05% initial accuracy 25ppm/ c max drift, so-8, msop and to-92 packages c-load is a trademark of linear technology corporation. related parts the rectified output is monitored by the ltc1540 com- parator. the internal reference is used to set up a threshold of about 18mv at the inverting input. a rising edge at the comparator output triggers a one shot that temporarily enables answer back and any other pulsed functions. the total supply current is 400na. among other monolithic one shots, the cd4047 draws the least amount of transient current. linear technology corporation 1630 mccarthy blvd., milpitas, ca 95035-7417 (408) 432-1900 l fax: (408) 434-0507 l www.linear.com

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