general description the max6381?ax6390 microprocessor (?) supervisory circuits monitor power-supply voltages from +1.8v to +5.0v while consuming only 3? of supply current at +1.8v. whenever v cc falls below the factory-set reset thresholds, the reset output asserts and remains assert-ed for a minimum reset timeout period after v cc rises above the reset threshold. reset thresholds are availablefrom +1.58v to +4.63v, in approximately 100mv incre- ments. seven minimum reset timeout delays ranging from 1ms to 1200ms are available. the max6381/max6384/max6387 have a push-pull active-low reset output. the max6382/max6385/ max6388 have a push-pull active-high reset output, and the max6383/max6386/max6389/max6390 have an open-drain active-low reset output. the max6384/max6385/max6386 also feature a debounced manual reset input (with internal pullup resistor). the max6387/max6388/max6389 have an auxiliary input for monitoring a second voltage. the max6390 offers a manual reset input with a longer v cc reset timeout period (1120ms or 1200ms) and a shortermanual reset timeout (140ms or 150ms). the max6381/max6382/max6383 are available in 3-pin sc70 and 6-pin dfn packages and the max6384?ax6390 are available in 4-pin sc70 and 6-pin ?fn packages. features ? factory-set reset threshold voltages rangingfrom +1.58v to +4.63v in approximately 100mv increments ? ?.5% reset threshold accuracy overtemperature (-40? to +125?) ? seven reset timeout periods available: 1ms,20ms, 140ms, 280ms, 560ms, 1120ms, 1200ms (min) ? 3 reset output options active-low push-pullactive-high push-pull active-low open-drain ? reset output state guaranteed valid down to v cc = 1v ? manual reset input (max6384/max6385/max6386) ? auxiliary reset in (max6387/max6388/max6389) ? v cc reset timeout (1120ms or 1200ms)/manual reset timeout (140ms or 150ms) (max6390) ? negative-going v cc transient immunity ? low power consumption of 6 a at +3.6v and 3 a at +1.8v ? pin compatible withmax809/max810/max803/max6326/max6327/ max6328/max6346/max6347/max6348, and max6711/max6712/max6713 ? tiny 3-pin/4-pin sc70 and 6-pin dfn packages max6381?ax6390 sc70/?fn, single/dual low-voltage, low-power ? reset circuits 1 reset (reset) 1 3v cc gnd max6381max6382 max6383 top view 2 sc70 ( ) is for max6382 123 654 gnd v cc n.c. n.c n.c. max6381max6382 max6383 dfn reset (reset) part temp range pin-package max6381 lt_ _d_+t -40 c to +125 c 6 ?fn max6381xr_ _d_+t -40 c to +125 c 3 sc70 m ax 6381x r_ _d _/v + t -40 c to +125 c 3 sc70 max6382 lt_ _d_+t -40 c to +125 c 6 ?fn max6382xr_ _d_+t -40 c to +125 c 3 sc70 pin configurations 19-1839; rev 5; 7/12 for pricing, delivery, and ordering information, please contact maxim direct at 1-888-629-4642, or visit maxim? website at www.maxim-ic.com. ordering information pin configurations continued at end of data sheet. ordering information continued at end of d ata sheet. typical operating circuit appears at end of data sheet. selector guide appears at end of data sheet. note: insert reset threshold suffix (see reset threshold table) after "xr", "xs", or "lt." insert reset timeout delay (see reset timeout delay table) after "d" to complete the part number. sample stock is generally held on standard versions only (see standard versions table). standard versions have an order increment requirement of 2500 pieces. nonstandard versions have an order increment requirement of 10,000 pieces. contact factory for availability of nonstandard versions. + denotes a lead(pb)-free/rohs-compliant package. /v denotes an automotive qualified part. computerscontrollers intelligent instruments critical ? and ?power monitoring portable/battery- powered equipment dual voltage systems applications downloaded from: http:///
max6381?ax6390 sc70/?fn, single/dual low-voltage, low-power ? reset circuits 2 absolute maximum ratings electrical characteristics (v cc = full range, t a = -40? to +125?, unless otherwise specified. typical values are at t a = +25?.) (note 1) stresses beyond those listed under ?bsolute maximum ratings?may cause permanent damage to the device. these are stress 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. v cc to gnd ..........................................................-0.3v to +6.0v reset open-drain output....................................-0.3v to +6.0v reset , reset (push-pull output) ..............-0.3v to (v cc + 0.3v) mr , reset in.............................................-0.3v to (v cc + 0.3v) input current (v cc ) .............................................................20ma output current (all pins) .....................................................20ma continuous power dissipation (t a = +70?) 3-pin sc70 (derate 2.9mw/? above +70?) ..............235mw 4-pin sc70 (derate 3.1mw/? above +70?) ..............245mw 6-pin ?fn (derate 2.1mw/? above +70?) ..........167.7mw operating temperature range .........................-40? to +125? storage temperature range .............................-65? to +150? lead temperature (soldering, 10s) .................................+300? soldering temperature (reflow) .......................................+260? parameter symbol conditions min typ max units operating voltage range v cc 1.0 5.5 v v cc = 5.5v, no load 7 13 v cc = 3.6v, no load 6 11 v cc = 2.5v, no load 4 7 v cc supply current i cc v cc = 1.8v, no load 3 6 ? t a = +25 c v th - 1.5% v th v th + 1.5% v cc reset threshold (see reset thresholds table) v th t a = -40 c to +125 c v th - 2.5% v th v th + 2.5% v reset threshold tempco ? v th / c 60 ppm / c v cc to reset delay v cc falling at 10mv/? from v th + 100mv to v th - 100mv 35 ? d1 1 2 d2 20 40 d3 140 280 d5 280 560 d6 560 1120 d4 1120 2240 reset timeout periodmax6381?ax6389 (see reset timeout table) t rp d7 1200 2400 ms d4 140 280 mr timeout period d7 150 300 d4 1120 2240 reset timeout periodmax6390 t rp v cc timeout period d7 1200 2400 ms v il 0.3 x v cc v ih v th < 4v 0.7 x v cc v il 0.8 mr input voltage v ih v th > 4v 2.4 v downloaded from: http:///
max6381?ax6390 sc70/?fn, single/dual low-voltage, low-power ? reset circuits 3 electrical characteristics (continued)(v cc = full range, t a = -40? to +125?, unless otherwise specified. typical values are at t a = +25?.) (note 1) note 1: specifications over temperature are guaranteed by design, not production tested. parameter symbol conditions min typ max units mr minimum input pulse width 1 s mr glitch rejection 100 ns mr to reset delay 200 ns max6381?ax6389 32 63 100 k ? mr internal pullup resistance max6390 500 1560 3000 ? t a = +25 c 1.245 1.27 1.295 t a = 0 c to +85 c 1.232 1.308 reset in input threshold v thrst t a = -40 c to +125 c 1.219 1.321 v reset in to reset delay v resetin falling at 4mv/? from v thrst + 40mv to v thrst - 40mv 4.5 ? reset in input leakage current i reset in -50 1 +50 na v cc 4.5v, i sink = 3.2ma, reset asserted 0.4 v cc 2.5v, i sink = 1.2ma, reset asserted 0.3 open-drain reset output voltage v ol v cc 1.0v, i sink = 80?, reset asserted 0.3 v open-drain reset output leakage current i lkg v cc > v th , reset not asserted 1.0 ? v cc 4.5v, i sink = 3.2ma, reset asserted 0.4 v cc 2.5v, i sink = 1.2ma, reset asserted 0.3 v ol v cc 1.0v, i sink = 80?, reset asserted 0.3 v cc 4.5v, i source = 800?, reset not asserted 0.8 x v cc push-pull reset output voltage v oh v cc 2.5v, i source = 500?, reset not asserted 0.8 x v cc v v cc 4.5v, i source = 800?, reset asserted 0.8 x v cc v cc 2.5v, i source = 500?, reset asserted 0.8 x v cc v cc 1.8v, i source = 150?, reset asserted 0.8 x v cc v oh v cc 1.0v, i source = 1?, reset asserted 0.8 x v cc v cc 4.5v, i sink = 3.2ma, reset not asserted 0.4 push-pull reset output voltage v ol v cc 2.5v, i sink = 1.2ma, reset not asserted 0.3 v downloaded from: http:///
max6381?ax6390 sc70/?fn, single/dual low-voltage, low-power ? reset circuits 4 typical operating characteristics (t a = +25?, unless otherwise noted.) 0 21 54 3 6 7 8 9 -40 -10 5 -25 203550658095110125 supply current vs. temperature (no load) m ax6381/90 toc01 te m perature ( c) supply current ( a) v cc = +1 . 8v v cc = +2 . 5v v cc = +3 . 6v v cc = +5 . 5v 25 2927 3533 31 37 39 41 43 -40 -10 5 -25 203550658095110125 power-down reset delay vs. temperature m ax6381/90 toc02 te m perature ( c) power-down reset delay ( s) v cc = +1 . 8v v cc = +3v 0 . 94 0 . 98 0 . 96 1 . 02 1 . 00 1 . 06 1 . 04 1 . 08 -40 -10 5 20 -25 3550658095110125 normalized power-up reset timeout vs. temperature m ax6381/90 toc03 te m perature ( c) nor m alized reset ti m eout period 0 . 990 0 . 985 1 . 015 0 . 995 0 . 990 1 . 000 1 . 005 1 . 010 1 . 020 -40 -10 5 20 -25 35 50 95 80 110 65 125 m ax6381/90 toc04 te m perature ( c) nor m alized reset threshold normalized reset threshold vs. temperature 0 0 . 4 0 . 2 0 . 8 0 . 6 1 . 0 1 . 2 06 39 1 2 output-voltage low vs. sink current m ax6381/90 toc05 i sink (ma) v ol (v) v cc = +3 . 0v v cc = +4 . 5v 0 1 . 0 0 . 5 2 . 0 1 . 5 2 . 5 3 . 0 0 500 750 250 1000 1250 1500 output-voltage high vs. source current m ax6381/90 toc06 i source ( a) v oh (v) v cc = +2 . 5v v cc = +1 . 8v 450 0 1 1000 100 10 maximum transient duration vs. reset comparator overdrive 150 50 350 250 500200 100 400 300 m ax6381/90 toc07 reset co m parator overdrive, v th - v cc (mv) m axi m u m transient duration ( s) reset assertedabove this line 3 . 5 3 . 9 3 . 7 4 . 5 4 . 3 4 . 1 4 . 7 4 . 9 5 . 3 5 . 1 5 . 5 -40 -10 5 -25 203550658095110125 reset in to reset delay vs. temperature m ax6381/90 toc08 te m perature ( c) reset in delay ( s) downloaded from: http:///
max6381?ax6390 sc70/?fn, single/dual low-voltage, low-power ? reset circuits 5 pin description pin 3-pin sc70 4-pin sc70 dfn max6381/ max6383 max6382 max6384/ max6386/ max6390 max6385 max6387/ max689 max6388 name function 1 (max6382/ max6385/ max6388) 2 2 2 reset active-high push-pull reset output.reset changes from low to high when any monitored voltage (v cc or v resetin ) drops below the reset threshold or mr is pulled low. reset remains high for the reset timeoutperiod after monitored voltages exceed the reset thresholds or mr is released. 1 (max6381/ max6383/max6384/ max6386/ max6387/ max6390) 2 2 2 reset acti ve- low op en- d r ai n/p ush- p ul l reset outp ut. re s e t chang es fr om hi g h to l ow w hen any m oni tor ed vol tag e ( v c c or v re s e tin ) d r op s b el ow the r eset thr eshol d or m r i s p ul l ed l ow . re s e t r em ai ns l ow for the r eset ti m eout p er i od after the m oni tor ed vol tag es exceed the r eset thr eshol d s or m r i s r el eased . o p en- d r ai n r eq ui r es an exter nal p ul l up r esi stor . 2, 3, 5 (max6381/ max6382/ max6383) 2, 5 (max6384 max6390) n.c. no connection. not internallyconnected. 3 (max6384/ max6385/max6386/ max6390) 3 3 mr active-low manual reset input. drivelow to force a reset. reset remains active as long as mr is low and for the reset timeout period after mr is released. leave unconnected orconnect to v cc if unused. mr has an internal 63k ? (1.56k ? for max6390) pullup resistor to v cc . 3 (max6387/ max6388/ max6389) 3 3 reset in auxi l i ar y reset inp ut. h i g h- i m p ed ance i np ut to the auxi l i ar y r eset com p ar ator . c onnect re s e t in to the center p oi nt of an exter nal r esi stor vol tag e- d i vi d er netw or k to set the r eset thr eshol d vol tag e. reset asser ts w hen ei ther v c c or re s e t in fal l s b el ow i ts thr eshol d vol tag e. 4 (max6381 max6390) 33 4 444v cc supply voltage for the device and inputfor fixed v cc reset threshold monitor. 6 (max6381 max6390) 1 1 1 1 1 1 gnd ground downloaded from: http:///
max6381?ax6390 sc70/?fn, single/dual low-voltage, low-power ? reset circuits 6 detailed description reset output a ? reset input starts the ? in a known state. these? supervisory circuits assert reset to prevent code execution errors during power-up, power-down, or brownout conditions. reset asserts when v cc is below the reset threshold; once v cc exceeds the reset threshold, an internal timer keeps the reset output asserted for the reset timeoutperiod. after this interval, reset output deasserts. reset output is guaranteed to be in the correct logic state for v cc 1v. manual reset input (max6384/ max6385/max6386/max6390) many ?-based products require manual reset capabil-ity, allowing the operator, a test technician, or external logic circuitry to initiate a reset. a logic low on mr asserts reset. reset remains asserted while mr is low, and for the reset active timeout period (t rp ) after mr returns high. this input has an internal 63k ? pullup resistor (1.56k ? for max6390), so it can be left uncon- nected if it is not used. mr can be driven with ttl or cmos logic levels, or with open-drain/collector outputs.connect a normally open momentary switch from mr to gnd to create a manual-reset function; externaldebounce circuitry is not required. if mr is driven from long cables or if the device is used in a noisy environ-ment, connecting a 0.1? capacitor from mr to gnd provides additional noise immunity. reset in comparator (max6387/max6388/max6389) reset in is compared to an internal +1.27v reference.if the voltage at reset in is less than 1.27v, reset asserts. use the reset in comparator as a user- adjustable reset detector or as a secondary power-sup- ply monitor by implementing a resistor-divider at reset in (shown in figure 1). reset asserts when either v cc or reset in falls below its respective threshold volt-age. use the following equation to set the threshold: v inth = v thrst (r1/r2 + 1) where v thrst = +1.27v. to simplify the resistor selec- tion, choose a value of r2 and calculate r1: r1 = r2 [(v inth /v thrst ) - 1] since the input current at reset in is 50na (max),large values can be used for r2 with no significant loss in accuracy. ___________applications information negative-going v cc transients in addition to issuing a reset to the ? during power-up,power-down, and brownout conditions, the max6381?ax6390 are relatively immune to short dura- tion negative-going v cc transients (glitches). the typical operating characteristics section shows the maximum transient durations vs. reset comparatoroverdrive, for which the max6381?ax6390 do not generate a reset pulse. this graph was generated using reset thresholds (-40? to +125?) suffix v th (min) v th (nom) v th (max) 46 4.51 4.63 4.74 45 4.39 4.50 4.61 44 4.27 4.38 4.48 43 4.19 4.30 4.41 42 4.10 4.20 4.31 41 4.00 4.10 4.20 40 3.90 4.00 4.10 39 3.80 3.90 4.00 38 3.71 3.80 3.90 37 3.61 3.70 3.79 36 3.51 3.60 3.69 35 3.41 3.50 3.59 34 3.32 3.40 3.49 33 3.22 3.30 3.38 32 3.12 3.20 3.28 31 3.00 3.08 3.15 30 2.93 3.00 3.08 29 2.85 2.93 3.00 28 2.73 2.80 2.87 27 2.63 2.70 2.77 26 2.56 2.63 2.69 25 2.44 2.50 2.56 24 2.34 2.40 2.46 23 2.26 2.31 2.37 22 2.13 2.19 2.24 21 2.05 2.10 2.15 20 1.95 2.00 2.05 19 1.85 1.90 1.95 18 1.76 1.80 1.85 17 1.62 1.67 1.71 16 1.54 1.58 1.61 downloaded from: http:///
a negative-going pulse applied to v cc , starting above the actual reset threshold and ending below it by themagnitude indicated (reset comparator overdrive). the graph indicates the typical maximum pulse width a neg- ative-going v cc transient may have without causing a reset pulse to be issued. as the magnitude of the tran-sient increases (goes farther below the reset threshold), the maximum allowable pulse width decreases. a 0.1? capacitor mounted as close as possible to v cc provides additional transient immunity. ensuring a valid reset output down to v cc = 0v the max6381?ax6390 are guaranteed to operateproperly down to v cc = 1v. in applications that require valid reset levels down to v cc = 0v, a pulldown resistor to active-low outputs (push/pull only, figure 2) and apullup resistor to active-high outputs (push/pull only) will ensure that the reset line is valid while the reset out- put can no longer sink or source current. this scheme does not work with the open-drain outputs of themax6383/max6386/max6389/max6390. the resistor value used is not critical, but it must be small enough not to load the reset output when v cc is above the reset threshold. for most applications, 100k ? is ade- quate. max6381?ax6390 sc70/?fn, single/dual low-voltage, low-power ? reset circuits 7 max6387max6388 max6389 reset in ( ) is for max6388 r1r2 reset (reset) gnd v cc v in max6381max6384 max6387 v cc r1 100k reset gnd figure 1. reset in configuration figure 2. reset valid to v cc = ground circuit part reset threshold reset timeout 46 44 31 29 26 23 22 17 max638_ 16 d3 46 44 31 29 26 23 22 17 max6390 16 d4 standard versions reset timeout delay suffix min d1 1ms d2 20ms d3 140ms d5 280ms d6 560ms d4 1120ms d7 1200ms max6390_ _d4 1120/140ms* max6390_ _d7 1200/150ms* * the max6390 has a 1120ms or 1200ms reset timeout and a 140ms or 150ms manual reset timeout. downloaded from: http:///
max6381?ax6390 sc70/?fn, single/dual low-voltage, low-power ? reset circuits 8 selector guide part number push-pull active-low push-pull active-high open-drainactive-low manual reset input mr reset in max6381 x max6382 x max6383 x max6384 x x max6385 x x max6386 x x max6390* x x max6387 x x max6388 x x max6389 x x * the max6390 offers a v cc reset timeout of 1120ms or 1200ms (min) and a manual reset timeout of 140ms or 150ms (min). v cc p m r * pushbutton switch reset (reset) resetinput gnd gnd reset in ** v core r1 i/o voltage i/o supply core voltage r1 m ax6381? m ax6390 * mr is for max6384/max6385/max6386/max6390 ** reset in is for max6387/max6388/max6389 ( ) are for max6382/max6385/max6388 part temp range pin-package max6383 lt_ _d_+t -40 c to +125 c 6 ?fn max6383xr_ _d_+t -40 c to +125 c 3 sc70 max6384 lt_ _d_+t -40 c to +125 c 6 ?fn max6384xs_ _d_+t -40 c to +125 c 4 sc70 max6385 lt_ _d_+t -40 c to +125 c 6 ?fn max6385xs_ _d_+t -40 c to +125 c 4 sc70 max6386 lt_ _d_+t -40 c to +125 c 6 ?fn max6386xs_ _d_+t -40 c to +125 c 4 sc70 max6387 lt_ _d_+t -40 c to +125 c 6 ?fn max6387xs_ _d_+t -40 c to +125 c 4 sc70 max6388 lt_ _d_+t -40 c to +125 c 6 ?fn max6388xs_ _d_+t -40 c to +125 c 4 sc70 max6389 lt_ _d_+t -40 c to +125 c 6 ?fn max6389xs_ _d_+t -40 c to +125 c 4 sc70 max6390 lt_ _d_+t -40 c to +125 c 6 ?fn max6390xs_ _d_+t* -40 c to +125 c 4 sc70 ordering information (continued) note: insert reset threshold suffix (see reset threshold table) after "xr", "xs", or "lt." insert reset timeout delay (see reset timeout delay table) after "d" to complete the part number. sample stock is generally held on standard versions only (see standard versions table). standard versions have an order increment requirement of 2500 pieces. nonstandard versions have an order increment requirement of 10,000 pieces. contact factory for availability of nonstandard versions. * max6390 is available with d4 or d7 timing only. + denotes a lead(pb)-free/rohs-compliant package. typical operating circuit downloaded from: http:///
max6381?ax6390 sc70/?fn, single/dual low-voltage, low-power ? reset circuits 9 chip information process: bicmos pin configurations (continued) ( ) is for m ax6388 sc70 top view 1 2 43 v cc reset (reset) gnd m ax6387 m ax6388 m ax6389 1 2 4 3 v cc m r reset (reset) gnd m ax6384 m ax6385 m ax6386 m ax6390 ( ) is for m ax6385 ( ) is for m ax6385 ( ) is for m ax6388 sc70 reset in 123 654 gnd v cc n . c . m r n . c . m ax6384 m ax6385 m ax6386 m ax6390 dfn reset (reset) 123 654 gnd v cc n . c . reset in n . c . m ax6387 m ax6388 m ax6389 dfn reset (reset) package information for the latest package outline information and land patterns, goto www.maxim-ic.com/packages . note that a ?? ?? or ??in the package code indicates rohs status only. package draw-ings may show a different suffix character, but the drawing per- tains to the package regardless of rohs status. package type package code outline no. land pattern no. 3 sc70 x3+2 21-0075 90-0208 4 sc70 x4+1 21-0 098 90-0187 6 dfn l611+1 21-0147 90-0080 downloaded from: http:///
max6381?ax6390 sc70/?fn, single/dual low-voltage, low-power ? reset circuits 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. the parametric values (min and max limits) shown in the electrical. characteristics table are guaranteed. other parametric values quoted in this data sheet are provided for guidance. 10 maxim integrated products, inc. 160 rio robles, san jose, ca 95134 usa 1-408-601-1000 2012 maxim integrated products maxim is a registered trademark of maxim integrated products, inc. revision history revision number revision date description pages changed 0 10/00 initial release 3 12/05 added lead-free notation to ordering information . 1, 8 4 4/07 added ?fn package to data sheet. 1, 2, 5, 7?3 5 7/12 added automotive package to ordering information .1 downloaded from: http:///
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