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general description the max6832?ax6840 are microprocessor (p) supervisory circuits used to monitor low-voltage power supplies in ? and digital systems. they provide excel- lent circuit reliability and low cost by eliminating exter- nal components and adjustments when used with +1.2v to +1.8v powered circuits. these devices assert a reset signal whenever the v cc supply voltage declines below a preset threshold or whenever manual reset ( mr ) is asserted. reset remains asserted for a fixed timeout delay after v cc has risen above the reset threshold or when manual reset is deasserted. five different timeout periods are available: 70? (voltage detector), 1.5ms, 30ms, 210ms, and 1.68s. reset thresholds suitable for operation with a variety of supply voltages are available. the max6832/max6835/max6838 have a push-pull active-low reset output ( reset ). the max6833/ max6836/max6839 have a push-pull active-high reset output (reset) and the max6834/max6837/max6840 have an open-drain active-low reset output ( reset ). the open-drain active-low reset output requires a pullup resis- tor that can be connected to a voltage higher than v cc . the max6835/max6836/max6837 feature a debounced manual reset input ( mr ), while the max6838/max6839/ max6840 provide a reset-in input allowing the user to externally adjust the reset threshold. the reset compara- tor is designed to ignore fast transients on v cc . low supply current of 7.5? makes the max6832 max6840 ideal for use in portable equipment. these devices are available in 3- and 4-pin sc70 packages. applications computers controllers intelligent instruments critical ? and ? power monitoring portable/battery-powered equipment features ? factory-set reset threshold voltages for nominal supplies from 1.2v to 1.8v ? low power consumption: 7.5? (typ) ? space-saving 3- and 4-pin sc70 packages ? ?.5% reset threshold accuracy over temperature ? five different timeout periods available: 70? (voltage detector), 1.5ms, 30ms, 210ms, and 1.68s ? three reset output configurations push-pull reset push-pull reset open-drain reset ? guaranteed reset valid to v cc = 0.55v?ctive-low 0.75v?ctive-high ? adjustable threshold reset-in option ? manual reset input option ? immune to short negative v cc transients ? pin compatible with max803/max809/max810, max6711/max6712/max6713, and max6381?ax6390 series max6832?ax6840 ultra-low-voltage sc70 voltage detectors and ? reset circuits ________________________________________________________________ maxim integrated products 1 ordering information 19-2242; rev 2; 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. pin configurations, typical operating circuit, and selector guide appear at end of data sheet. part temp range pin-package max6832 _xrd_-t -40 c to +85 c3 sc70-3 max6833 _xrd_-t -40 c to +85 c3 sc70-3 max6834 _xrd_-t -40 c to +85 c3 sc70-3 max6835 _xsd_-t -40 c to +85 c4 sc70-4 max6836 _xsd_-t -40 c to +85 c4 sc70-4 max6837 _xsd_-t -40 c to +85 c4 sc70-4 max6838 xsd_-t -40 c to +85 c4 sc70-4 max6839 xsd_-t -40 c to +85 c4 sc70-4 max6840 xsd_-t -40 c to +85 c4 sc70-4 insert the desired suffix letter from the threshold suffix guide (max6832?ax6837) and the active timeout period guide tables into the blanks to complete the part number. sample stock is generally available on standard versions only (see standard versions table). standard versions require a minimum order increment of 2.5k units. nonstandard versions must be ordered in 10k unit increments. contact factory for availability. all parts are offered in tape-and-reel only. devices are available in both leaded and lead-free packaging. specify lead-free by replacing ?t?with ?t?when ordering.
max6832?ax6840 ultra-low-voltage sc70 voltage detectors and ? reset circuits 2 _______________________________________________________________________________________ absolute maximum ratings electrical characteristics (v cc = +0.55v to +3.6v, t a = t min to t max , unless otherwise noted. 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. terminal voltage (with respect to gnd) v cc ........................................................................-0.3v to +6.0v open-drain reset , mr .......................................-0.3v to +6.0v reset-in, push-pull reset and reset ..............................................-0.3v to (v cc + 0.3v) input/output current (all pins) ............................................20ma continous 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 +85? junction temperature ......................................................+150? storage temperature range .............................-65? to +150? lead temperature (soldering, 10s) .................................+300? parameter symbol conditions min typ max units t a = -40 c to +85 c max6832/max6835/max6838 max6834/max6837/max6840 0.55 3.6 t a = -40 c to +85 c max6833/max6836/max6839 0.85 3.6 supply voltage range v cc t a = 0 c to +85 c max6833/max6836/max6839 0.75 3.6 v v cc = 1.2v, no load, reset not asserted 7.5 13 v cc = 1.8v, no load, reset not asserted 9 16 supply current i cc v cc = 3.6v, no load, reset not asserted 16 25 ? w 1.620 1.665 1.710 v 1.530 1.575 1.620 i 1.350 1.388 1.425 h 1.275 1.313 1.350 g 1.080 1.110 1.140 reset threshold v th f (note 2) 1.020 1.050 1.080 v 1.1v v cc 3.3v, 0? to +85? -2.5% 444 +2.5% reset-in threshold v rstin 1.1v v cc 3.3v, -40? to +85? -3.0% 444 +3.0% mv reset-in leakage current i rstin -25 +25 na reset threshold hysteresis v hys 0.75 %v th v cc or reset-in to reset delay v cc falling, step signal from (v th + 100mv) to (v th - 100mv) 60 ? d0 0.07 d1 1 1.5 2 d2 20 30 40 d3 140 210 280 reset active timeout period t rp d4 1120 1680 2240 ms
max6832?ax6840 ultra-low-voltage sc70 voltage detectors and ? reset circuits _______________________________________________________________________________________ 3 electrical characteristics (continued) (v cc = +0.55v to +3.6v, t a = t min to t max , unless otherwise noted. typical values are at t a = +25?.) (note 1) parameter symbol conditions min typ max units propagation delay (d0 only) t p v cc rising, step signal from (v th - 100mv) to (v th + 100mv) 70 ? startup time (d0 only) v cc rising from 0 to 1.1v (t r < 1?) 150 ? v il 0.3 x v cc mr input voltage v ih 0.7 x v cc v mr minimum input pulse width mr driven from v cc to 0 2 ? mr glitch rejection mr driven from v cc to 0 100 ns mr to reset delay mr driven from v cc to 0 500 ns mr pullup resistance to v cc 14 20 26 k ? 0.55v, i sink =15?, reset asserted 0.15 v cc 1.0v, i sink = 80?, reset asserted 0.15 open-drain reset output voltage v ol v cc 1.5v, i sink = 200?, reset asserted 0.2 v open-drain reset output leakage current i lkg v cc > v th, reset not asserted 1.0 ? v cc 0.55v, i sink = 15?, reset asserted 0.2 x v cc v cc 1.0v, i sink = 80?, reset asserted 0.2 x v cc v ol v cc 1.5v, i sink = 200?, reset asserted 0.2 x v cc v cc 1.1v, i source = 50?, reset not asserted 0.8 x v cc push-pull reset output voltage v oh v cc 1.5v, i source = 150?, reset asserted 0.8 x v cc v v cc 0.75v, i source = 10?, reset asserted (note 2) 0.8 x v cc v cc 0.85v, i source = 10?, reset asserted 0.8 x v cc v cc 1.0v, i source = 50?, reset asserted 0.8 x v cc v oh v cc 1.5v, i source = 150?, reset asserted 0.8 x v cc v cc 1.1v, i sink = 80?, reset not asserted 0.2 x v cc push-pull reset output voltage v ol v cc 1.5v, i sink = 200?, reset not asserted 0.2 x v cc v note 1: 100% production tested at +25?. over temperature limits are guaranteed by design. note 2: temperature range is from 0? to +85?.
max6832?ax6840 ultra-low-voltage sc70 voltage detectors and ? reset circuits 4 _______________________________________________________________________________________ t ypical operating characteristics (v cc = full range and t a = -40? to +85?, unless otherwise noted. typical values are at t a = +25?). supply current vs. temperature max6832-40 toc01 0 2 6 4 12 14 10 8 16 supply current ( a) -40 0 20 -20 40 60 80 temperature ( c) v cc = 3.6v v cc = 3.0v v cc = 2.5v v cc = 1.8v v cc = 1.5v v cc = 0.55v 0 100 50 200 150 250 300 -40 20 40 -20 0 60 80 power-down reset delay vs. temperature max6832-40 toc02 temperature ( c) power-down reset delay ( s) v od = overdrive (mv) v od = 10mv v od = 20mv v od = 100mv v od = 200mv 0.994 0.996 0.995 0.999 0.998 0.997 1.002 1.001 1.000 1.003 -40 0 -20 20 40 60 80 normalized reset threshold vs. temperature max6832-40 toc04 temperature ( c) normalized reset threshold v th = 1.665v 0.94 0.98 0.96 1.02 1.00 1.04 1.06 -40 20 40 -20 0 60 80 normalized power-up reset timeout vs. temperature max6832-40 toc03 temperature ( c) normalized reset timeout period d1 option d2 option
max6832?ax6840 ultra-low-voltage sc70 voltage detectors and ? reset circuits _______________________________________________________________________________________ 5 pin description?ax6832?ax6837 pin max6833 sc70-3 max6832/ max6834 sc70-3 max6836 sc70-4 max6835/ max6837 sc70-4 name function 11 11 gnd ground ?? reset reset output, open-drain or push-pull, active-low. reset changes from high to low when v cc drops below the selected reset threshold or mr is pulled low. reset remains low for the reset timeout period after v cc exceeds the device reset threshold and mr is released high. 2 2 reset reset output, push-pull, active-high. reset changes from low to high when the v cc input drops below the selected reset threshold or mr is pulled low. reset remains high for the reset timeout period after v cc exceeds the device reset threshold and mr is released high. 3 3 mr active-low manual reset input. internal 20k ? pullup to v cc . pull low to force a reset. reset remains active as long as mr is low and for the reset timeout period after mr goes high. leave unconnected or connect to v cc if unused. 3344v cc supply voltage and monitored supply pin description?ax6838/max6839/max6840 pin max6839 sc70-4 max6838/ max6840 sc70-4 name function 11 reset-in adjustable reset threshold input. high-impedance input for reset comparator. connect this pin to an external resistive-divider network to set the reset threshold voltage; the typical threshold is 444mv. reset is asserted when reset-in is below the threshold (v cc is not monitored). 22v cc supply voltage (1.1v to 3.3v) 33 gnd ground 4 reset reset output, push-pull, active-high. reset changes from low to high when the reset-in input drops below the typical reset threshold (444mv). reset remains high for the reset timeout period after reset-in exceeds the reset threshold. ? reset reset output, open-drain or push-pull, active-low. reset changes from high to low when reset-in drops below the typical reset threshold (444mv). reset remains low for the reset timeout period after reset-in exceeds the reset threshold.
max6832?ax6840 detailed description reset output a microprocessor? (??) reset input starts the ? in a known state. the max6832?ax6840 assert a reset to prevent code-execution errors during power-up, power- down, or brownout conditions. they also assert a reset signal whenever the v cc supply voltage falls below a preset threshold (max6832?ax6837) or reset-in falls below the adjustable threshold (max6838/ max6839/max6840), keeping reset asserted for a fixed timeout delay (table 2) after v cc or reset-in has risen above the reset threshold. the max6832/max6835/ max6838 use a push-pull active-low output, the max6833/max6836/max6839 have a push-pull active- high output, and the max6834/max6837/max6840 have an open-drain active-low output stage. connect a pullup resistor on the max6834/max6837/max6840? reset output to any supply between 0 and 6v. manual reset input many ?-based systems require manual reset capabili- ty, allowing the operator, a test technician, or external logic circuitry to initiate a reset. reset remains asserted while mr is low, and for a fixed timeout delay after mr returns high. this input has an internal 20k ? pullup resistor, so it can be left open if it is not used. mr can be driven with cmos logic level, or with open-drain/col- lector outputs. to create a manual reset function, con- nect a normally open momentary switch from mr to ground; external debounce circuitry is not required. if mr is driven from long cables or if the device is used in a noisy environment, connecting a 0.1? capacitor from mr to ground provides additional noise immunity. reset-in information the max6838/max6839/max6840 feature a reset-in input for monitoring supply voltages down to 0.44v. an external resistive-divider network can be used to set voltage monitoring thresholds as shown in figure 1. as the monitored voltage falls, the voltage at reset-in decreases and asserts a reset when it falls below the reset-in threshold (v rstin ). the low-leakage current ultra-low-voltage sc70 voltage detectors and ? reset circuits 6 _______________________________________________________________________________________ max6838/ max6839/ max6840 reset timeout period reset output v ref = 444mv reset-in reset/ reset gnd v cc v cc max6832 max6837 reset timeout period manual reset detect reset output v ref = 444mv reset/ reset gnd mr (max6835/max6836/max6837 only) mr pullup functional diagrams v monitored r1 r2 reset-in gnd reset (reset) v cc ( ) are for max6839 max6838/ max6839/ max6840 r1 = r2 [(v monitored /v ref ) -1] where v monitored is the desired trip level, v ref = 444mv figure 1. setting the adjustable threshold externally
at reset-in allows for relatively large-value resistors to be used, which reduce power consumption. for exam- ple, for a 0.6v monitored trip level, if r2 = 200k ? , then r1 = 70.3k ? . note that the minimum v cc of 1.1v is required to guarantee the reset-in threshold accura- cy (see electrical characteristics table). applications information negative-going v cc transients in addition to issuing a reset to the ? during power-up, power-down, and brownout conditions, the max6832 max6840 are relatively immune to short-duration nega- tive-going v cc transients (glitches). figure 2 shows typical transient duration vs. reset com- parator overdrive, for which the max6832?ax6840 do not generate a reset pulse. the graph was generated using a negative-going pulse applied to v cc , starting 0.1v above the actual reset threshold and ending below it by the magnitude indicated (reset comparator overdrive). the graph indicates the maximum pulse width a negative-going v cc transient can have without causing a reset pulse. as the magnitude of the tran- sient increases (goes farther below the reset threshold), the maximum allowable pulse width decreases. a 0.1? bypass capacitor mounted as close as possible to the v cc pin provides additional transient immunity. ensuring a valid reset output down to v cc = 0 when v cc falls below 0.55v, the max6832/max6835/ max6838 push-pull reset output no longer sinks cur- rent?t becomes an open circuit. therefore, high- impedance cmos logic inputs connected to reset can drift to undetermined voltages. this presents no problem in most applications since most ? and other circuitry are inoperative with v cc lower than 0.55v. however, in applications where reset must be valid down to 0, adding a pulldown resistor to reset causes any stray leakage currents to flow to ground, holding reset low (figure 3). r3? value is not critical; 100k ? is large enough not to load reset and small enough to pull reset to ground. a 100k ? pullup resistor to v cc is also recommended for the max6833/max6836/max6839 if reset is required to remain valid for v cc < 0.85v. interfacing to ?s with bidirectional reset pins since the reset output on the max6834/max6837/ max6840 is open-drain, these devices interface easily with ?s that have bidirectional reset pins. connecting the ? supervisor? reset output directly to the ?? reset pin with a single pullup resistor allows either device to assert a reset (figure 4). max6832?ax6840 ultra-low-voltage sc70 voltage detectors and ? reset circuits _______________________________________________________________________________________ 7 0 200 300 400 500 600 700 800 900 110 100 maximum transient duration vs. overdrive overdrive v th - v cc (mv) maximum transient duration ( s) 100 reset occurs above this line figure 2. maximum transient duration without causing a reset pulse vs. reset comparator overdrive r3 100k ? v cc gnd max6832 max6835 max6838 reset figure 3. reset valid to v cc = ground circuit reset gnd reset input max6834 max6837 max6840 bidirectional p gnd v cc v cc v cc figure 4. interfacing to ?s with bidirectional reset i/o
max6832?ax6840 using the max6834/max6837/max6840 open-drain reset output with multiple supplies generally, the pullup connected to the max6834/ max6837/max6840 will connect to the supply voltage that is being monitored at the ic? v cc pin. however, some systems may use the open-drain output to level- shift from the monitored supply to reset circuitry pow- ered by some other supply (figure 5). note that as the max6834/max6837/max6840? v cc decreases, so does the ic? ability to sink current at reset . also, with any pullup, reset will be pulled high as v cc declines toward 0. the voltage where this occurs depends on the pullup resistor value and the voltage to which it is connected. chip information transistor count: 681 process: bicmos ultra-low-voltage sc70 voltage detectors and ? reset circuits 8 _______________________________________________________________________________________ reset gnd reset input r pullup max6834 max6837 max6840 5v system gnd v cc +1.2v +5.0v v cc figure 5. using the max6834/max6837/max6840 open-drain reset output with multiple supplies table 2. active timeout period guide suffix typical reset active timeout period (ms) d0 0.07 d1 1.5 d2 30 d3 210 d4 1680 table 3. standard versions device top mark max6832vxrd0 aiq max6832vxrd3 air max6832hxrd0 ais max6832hxrd3 ait max6832fxrd0 aiu max6832fxrd3 aiv max6833vxrd0 ahj max6833vxrd3 aiw max6833hxrd0 aix max6833hxrd3 aiy max6833fxrd0 aiz max6833fxrd3 aja max6834vxrd0 ajb max6834vxrd3 ajc max6834hxrd0 ajd max6834hxrd3 aje max6834fxrd0 ajf max6834fxrd3 ajg max6835vxsd0 aex table 1. threshold suffix guide selector guide suffix reset threshold (v) w 1.665 v 1.575 i 1.388 h 1.313 g 1.110 f 1.050
max6832?ax6840 ultra-low-voltage sc70 voltage detectors and ? reset circuits _______________________________________________________________________________________ 9 dc/dc converter reset gnd reset core supply i/o supply v in 3.3v 1.2v v cc max6834g/f gnd p t ypical operating circuit 1 2 3 v cc reset (reset) gnd max6832 max6833 max6834 sc70-3 top view 1 2 4 v cc reset (reset) gnd max6835 max6836 max6837 sc70-4 3 mr 1 2 4 v cc reset (reset) reset-in max6838 max6839 max6840 sc70-4 3 gnd ( ) are for max6839 ( ) are for max6836 ( ) are for max6833 pin configurations table 3. standard versions (continued) device top mark max6835vxsd3 aff max6835hxsd0 afg max6835hxsd3 afh max6835fxsd0 afi max6835fxsd3 afj max6836vxsd0 afk max6836vxsd3 afl max6836hxsd0 afm max6836hxsd3 afn max6836fxsd0 afo max6836fxsd3 afp max6837vxsd0 afq max6837vxsd3 afr max6837hxsd0 afs max6837hxsd3 aft max6837fxsd0 afu max6837fxsd3 afc max6838xsd0 afw max6838xsd3 afv max6839xsd0 afx max6839xsd3 aez max6840xsd0 afy max6840xsd3 afz selector guide (continued)
max6832?ax6840 ultra-low-voltage sc70 voltage detectors and ? reset circuits 10 ______________________________________________________________________________________ sc70, 3l.eps package outline, 3l sc70 21-0075 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 .)
max6832?ax6840 ultra-low-voltage sc70 voltage detectors and ? 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 2005 maxim integrated products printed usa is a registered trademark of maxim integrated products, inc. sc70, 4l.eps package outline, 4l sc70 21-0098 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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