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general description the max6381?ax6390 microprocessor (p) supervisory circuits monitor power supply voltages from +1.8v to +5.0v while consuming only 3a 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 available from +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 shorter manual reset timeout (140ms or 150ms). the max6381/max6382/max6383 are available in 3-pin sc70 packages and the max6384?ax6390 are avail- able in 4-pin sc70 packages. ________________________applications computers controllers intelligent instruments critical ? and ? power monitoring portable/battery-powered equipment dual voltage systems features ? factory-set reset threshold voltages ranging from +1.58v to +4.63v in approximately 100mv increments ? ?.5% reset threshold accuracy over temperature (-40? to +125?) ? seven reset timeout periods available: 1ms, 20ms, 140ms, 280ms, 560ms, 1120ms, 1200ms (min) ? 3 reset output options active-low push-pull active-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? at +3.6v and 3? at +1.8v ? pin compatible with max809/max810/max803/max6326/max6327/ max6328/max6346/max6347/max6348, and max6711/max6712/max6713 ? tiny 3-pin sc70 and 4-pin sc70 packages max6381?ax6390 sc70, single/dual low-voltage, low-power ? reset circuits ________________________________________________________________ maxim integrated products 1 reset (reset) 1 3 v cc gnd max6381 max6382 max6383 top view 2 sc70 ( ) is for max6382 part temp range pin-package max6381 xr_ _d_-t -40 c to +125 c3 sc70-3 max6382 xr_ _d_-t -40 c to +125 c3 sc70-3 max6383 xr_ _d_-t -40 c to +125 c3 sc70-3 pin configurations 19-1839; rev 2; 9/04 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" or "xs". 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. 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.
max6381?ax6390 sc70, 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 rating s only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specificatio ns is not implied. exposure to absolute maximum rating conditions for extended periods may affect device reliability. v cc 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 operating temperature range .........................-40? to +125? storage temperature range .............................-65? to +150? lead temperature (soldering, 10s) .................................+300? 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 period max6381?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 period max6390 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
max6381?ax6390 sc70, 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
max6381?ax6390 sc70, single/dual low-voltage, low-power ? reset circuits 4 ______________________________________________________________________________________ t ypical operating characteristics (t a = +25?, unless otherwise noted.) 0 2 1 5 4 3 6 7 8 9 -40 -10 5 -25 20 3 550658095110125 supply current vs. temperature (no load) max6381/90 toc01 temperature ( c) supply current ( a) v cc = +1.8v v cc = +2.5v v cc = +3.6v v cc = +5.5v 25 29 27 35 33 31 37 39 41 43 -40 -10 5 -25 20 3 55065809 5 110 125 power-down reset delay vs. temperature max6381/90 toc02 temperature ( 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 35 5 0658095110125 normalized power-up reset timeout vs. temperature max6381/90 toc03 temperature ( c) normalized reset timeout 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 max6381/90 toc04 temperature ( c) normalized reset threshold normalized reset threshold vs. temperature 0 0.4 0.2 0.8 0.6 1.0 1.2 06 3912 output voltage low vs. sink current max6381/90 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 max6381/90 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 50 350 250 500 200 100 400 300 max6381/90 toc07 reset comparator overdrive, v th - v cc (mv) maximum transient duration ( s) reset asserted above 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 20 3 550658095110125 reset in to reset delay vs. temperature max6381/90 toc08 temperature ( c) reset in delay ( s)
max6381?ax6390 sc70, single/dual low-voltage, low-power ? reset circuits _______________________________________________________________________________________ 5 pin description pin max6381/ max6383 max6382 max6384/ max6386/ max6390 max6385 max6387/ max689 max6388 name function 11 11 11 gnd ground ?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 timeout period after monitored voltages exceed the reset thresholds or mr is released. 222 reset active-low open-drain/push-pull reset output. reset changes from high to low when any monitored voltage (v cc or v resetin ) drops below the reset threshold or mr is pulled low. reset remains low for the reset timeout period after the monitored voltages exceed the reset thresholds or mr is released. open-drain requires an external pullup resistor. 3 3 mr active-low manual reset input. drive low 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 or connect to v cc if unused. mr has an internal 63k ? (1.56k ? for max6390) pullup resistor to v cc . 3 3 reset in auxiliary reset input. high-impedance input to the auxiliary reset comparator. connect reset in to the center point of an external resistor voltage-divider network to set the reset threshold voltage. reset asserts when either v cc or reset in falls below its threshold voltage. 334444v cc supply voltage for the device and input for fixed v cc reset threshold monitor.
max6381?ax6390 sc70, 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 timeout period. 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; external debounce 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 comparator overdrive, 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
a negative-going pulse applied to v cc , starting above the actual reset threshold and ending below it by the magni- tude indicated (reset comparator overdrive). the graph indicates the typical maximum pulse width a negative- going v cc transient may have without causing a reset pulse to be issued. as the magnitude of the transient 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 = 0 the max6381?ax6390 are guaranteed to operate properly down to v cc = 1v. in applications that require valid reset levels down to v cc = 0, a pulldown resistor to active-low outputs (push/pull only, figure 2) and a pullup resistor to active-high outputs (push/pull only) will ensure that the reset line is valid while the reset output can no longer sink or source current. this scheme does not work with the open-drain outputs of the max6383/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 adequate. max6381?ax6390 sc70, single/dual low-voltage, low-power ? reset circuits _______________________________________________________________________________________ 7 max6387 max6388 max6389 reset in ( ) is for max6388 r1 r2 reset (reset) gnd v cc v in max6381 max6384 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 max6390xsd4 1120/140ms * max6390xsd7 1200/150ms * * the max6390 has a 1120ms or 1200ms reset timeout and a 140ms or 150ms manual reset timeout.
max6381?ax6390 sc70, single/dual low-voltage, low-power ? reset circuits 8 _______________________________________________________________________________________ selector guide part number push-pull active-low push-pull active-high open-drain active-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). max6381?ax6390 v cc p mr * pushbutton switch reset (reset) reset input gnd gnd reset in ** v core r1 i/o voltage i/o supply core voltage r1 chip information transistor count: 647 process: bicmos * mr is for max6384/max6385/max6386/max6390 ** reset in is for max6387/max6388/max6389 ( ) are for max6382/max6385/max6388 ( ) is for max6388 sc70 top view 1 2 4 3 v cc reset (reset) gnd max6387 max6388 max6389 1 2 4 3 v cc mr reset (reset) gnd max6384 max6385 max6386 max6390 ( ) is for max6385 sc70 reset in pin configurations (continued) t ypical operating circuit
max6381?ax6390 sc70, single/dual low-voltage, low-power ? reset circuits _______________________________________________________________________________________ 9 part temp range pin-package max6384 xs_ _d_-t -40 c to +125 c 4 sc70-4 max6385 xs_ _d_-t -40 c to +125 c 4 sc70-4 max6386 xs_ _d_-t -40 c to +125 c 4 sc70-4 max6387 xs_ _d_-t -40 c to +125 c 4 sc70-4 max6388 xs_ _d_-t -40 c to +125 c 4 sc70-4 max6389 xs_ _d_-t -40 c to +125 c 4 sc70-4 max6390 xs_ _d_-t* -40 c to +125 c 4 sc70-4 ordering information (continued) note: insert reset threshold suffix (see reset threshold table) after "xr" or "xs". 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.
max6381?ax6390 sc70, single/dual low-voltage, low-power ? reset circuits 10 ______________________________________________________________________________________ sc70, 4l.eps package outline, 4l sc70 21-0098 1 1 c 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 .)
sc70, 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 circu it patent licenses are implied. maxim reserves the right to change the circuitry and specifications without notice at any time. maxim integrated products, 120 san gabriel drive, sunnyvale, ca 94086 408-737-7600 ____________________ 11 2004 maxim integrated products printed usa is a registered trademark of maxim integrated products. sc70, 3l.eps package outline, 3l sc70 21-0075 1 1 c package information (continued) (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 .)

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