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max6412?ax6420 low-power, single/dual-voltage ? reset circuits with capacitor-adjustable reset timeout delay for pricing, delivery, and ordering information, please contact maxim direct at 1-888-629-4642, or visit maxim? website at www.maximintegrated.com. general description the max6412?ax6420 low-power microprocessor supervisor circuits monitor system voltages from 1.6v to 5v. these devices are designed to assert a reset signal whenever the v cc supply voltage or reset in falls below its reset threshold or the manual reset input is asserted. the reset output remains asserted for the reset timeout period after v cc and reset in rise above the reset threshold and the manual reset input is deasserted. the reset timeout is externally set by a capacitor to provide more flexibility. the max6412/MAX6413/max6414 feature fixed thresholds from 1.575v to 5v in approximately 100mv increments and a manual reset input. the max6415/max6416/max6417 are offered with an adjustable reset input that can monitor voltages down to 1.26v and the max6418/max6419/ max6420 are offered with one fixed input and one adjustable input to monitor dual-voltage systems. the max6412/max6415/max6418 have an active-low, push-pull reset output. the MAX6413/max6416/ max6419 have an active-high, push-pull reset output and the max6414/max6417/max6420 have an active- low, open-drain reset output. all of these devices are offered in a sot23-5 package and are fully specified from -40? to +125?. applications automotive medical equipment intelligent instruments portable equipment battery-powered computers/controllers embedded controllers critical ? monitoring set-top boxes computers features monitor system voltages from 1.6v to 5v capacitor-adjustable reset timeout period manual reset input (max6412/MAX6413/max6414) adjustable reset input option (max6415?ax6420) dual-voltage monitoring (max6418/max6419/max6420) low quiescent current (1.7?, typ) 3 reset output options push-pull reset push-pull reset open-drain reset guaranteed reset valid to v cc = 1v power-supply transient immunity small sot23-5 packages low-power, single/dual-voltage ? reset circuits with capacitor-adjustable reset timeout delay ordering information gnd srt 15 v cc max6412 max6420 sot23-5 top view 2 34 reset/reset reset in (mr) ( ) for the max6412/MAX6413/max6414. pin configuration 19-2336; rev 5; 8/12 selector guide and typical operating circuit appear at end of data sheet. part temp range pin-package max6412 uk_ _-t -40c to +125c 5 sot23 MAX6413 uk_ _-t -40c to +125c 5 sot23 max6414 uk_ _-t -40c to +125c 5 sot23 max6415 uk-t -40c to +125c 5 sot23 max6416 uk-t -40c to +125c 5 sot23 max6417 uk-t -40c to +125c 5 sot23 max6418 uk_ _-t -40c to +125c 5 sot23 max6419 uk_ _-t -40c to +125c 5 sot23 max6420 uk_ _-t -40c to +125c 5 sot23 max6420uk_ _/v-t -40c to +125c 5 sot23 note: the max6412/MAX6413/max6414 and max6418/ max6419/max6420 are available with factory-set v cc reset thresholds from 1.575v to 5.0v in approximately 0.1v incre- ments. insert the desired nominal reset threshold suffix (from table 1) into the blanks following the letters uk. there are 33 standard versions with a required order increment of 2500 pieces. sample stock is generally held on standard versions only (see standard versions table). required order increment is 10,000 pieces for nonstandard versions. contact factory for availability. all devices are available 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. /v denotes an automotive qualified part.
low-power, single/dual-voltage ? reset circuits with capacitor-adjustable reset timeout delay max6412?ax6420 2 maxim integrated absolute maximum ratings electrical characteristics (v cc = 1v to 5.5v, t a = t min to t max , unless otherwise specified. typical values are at v cc = 5v and 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. all voltages referenced to gnd v cc ........................................................................-0.3v to +6.0v srt, mr , reset in ....................................-0.3v to (v cc + 0.3v) reset, reset (push-pull) .........................-0.3v to (v cc + 0.3v) reset (open-drain) .............................................-0.3v to +6.0v input current (all pins) .....................................................?0ma output current ( reset , reset) ......................................?0ma continuous power dissipation (t a = +70?) 5-pin sot23 (derate 7.1mw/? above +70?)............571mw operating temperature range .........................-40? to +125? junction temperature ......................................................+150? storage temperature range .............................-65? to +150? lead temperature (soldering, 10s) .................................+300? soldering temperature (reflow) lead(pb)-free packages..............................................+260? packages containing lead (pb)....................................+240? parameter symbol conditions min typ max units supply voltage range v cc 1.0 5.5 v v cc 5.0v 2.6 4.5 v cc 3.3v 2 3.5 supply current i cc v cc 2.0v 1.7 2.5 ? t a = +25? v th - 1.25% v th + 1.25% v cc reset threshold accuracy v th t a = -40? to +125? v th - 2.5% v th + 2.5% v hysteresis v hyst 4 x v th mv v cc to reset delay t rd v cc falling at 1mv/? 100 ? c srt = 1500pf 3.00 4.375 5.75 reset timeout period t rp c srt = 0f 0.275 ms v srt ramp current i ramp v srt = 0 to 0.65v; v cc = 1.6v to 5v 240 na v srt ramp threshold v th-ramp v cc = 1.6v to 5v (v ramp rising) 0.65 v ramp threshold hysteresis v ramp falling threshold 33 mv v cc 1.0v, i sink = 50? 0.3 v cc 2.7v, i sink = 1.2ma 0.3 reset output voltage low v ol v cc 4.5v, i sink = 3.2ma 0.4 v v cc 1.8v, i source = 200? 0.8 x v cc v cc 2.25v, i source = 500? 0.8 x v cc reset output voltage high, (push-pull) v oh v cc 4.5v, i source = 800? 0.8 x v cc v reset output leakage current, (open-drain) i lkg v cc > v th , reset not asserted 1.0 ? v cc 1.0v, i source = 1? 0.8 x v cc v cc 1.8v, i source = 150? 0.8 x v cc v cc 2.7v, i source = 500? 0.8 x v cc reset output voltage high v oh v cc 4.5v, i source = 800? 0.8 x v cc v
low-power, single/dual-voltage ? reset circuits with capacitor-adjustable reset timeout delay max6412?ax6420 maxim integrated 3 electrical characteristics (continued) (v cc = 1v to 5.5v, t a = t min to t max , unless otherwise specified. typical values are at v cc = 5v and t a = +25?.) (note 1) parameter symbol conditions min typ max units v cc 1.8v, i sink = 500? 0.3 v cc 2.7v, i sink = 1.2ma 0.3 reset output voltage low v ol v cc 4.5v, i sink = 3.2ma 0.4 v reset in leakage current 10 na reset in threshold v rst v rst falling, v cc = 1.6v to 5.0v 1.205 1.255 v v il 0.8 v ih v cc > 4.0v 2.4 v il 0.3 x v cc mr input v ih v cc < 4.0v 0.7 x v cc v mr minimum pulse width 1 s mr glitch rejection 75 ns mr to reset delay 20 ns mr pullup resistance pull up to v cc 12 20 28 k ? note 1: devices production tested at t a = +25?. over temperature limits are guaranteed by design. typical operating characteristics (v cc = 5v, c srt = 1500pf, t a = +25?, unless otherwise noted.) 4 3 2 1 0 03 12 456 supply current vs. supply voltage max6412-20 toc01 supply voltage (v) supply current ( a) t a = +125c t a = +25c t a = -40c 0 1.0 0.5 2.0 1.5 3.0 2.5 3.5 -50 0 25 -25 50 75 100 125 supply current vs. temperature max6412-20 toc02 temperature (c) supply current ( a) v cc = 5v v cc = 3.3v v cc = 1.8v v cc = 1v 0.1 1 100 10 1000 10,000 0.001 0.10.01 1 10 100 1000 reset timeout period vs. c srt max6412-20 toc03 c srt (nf) reset timeout period (ms)
low-power, single/dual-voltage ? reset circuits with capacitor-adjustable reset timeout delay 4.05 4.10 4.20 4.15 4.25 4.30 -50 0-25 25 50 75 100 125 reset timeout period vs. temperature max6412-20 toc04 temperature (c) reset timeout period (ms) c srt = 1500pf reset timeout period vs. temperature max6412-20 toc05 200 250 350 300 500 550 450 400 600 reset timeout period ( s) -50 0 25 -25 50 75 100 125 temperature (c) c srt = 0 1.250 1.260 1.255 1.270 1.265 1.275 1.280 -50 25 50 -25 0 75 100 125 reset in threshold voltage vs. temperature max6412-20 toc06 temperature (c) reset in threshold voltage (v) 0 50 25 100 75 150 125 175 04 0 0 200 600 800 1000 maximum transient duration vs. reset threshold overdrive max6412-20 toc07 reset threshold overdrive (mv) transient duration ( s) reset occurs above the curve v th = 3.0v max6412?ax6420 4 maxim integrated typical operating characteristics (continued) (v cc = 5v, c srt = 1500pf, t a = +25?, unless otherwise noted.)
detailed description the max6412?ax6420 low-power microprocessor (?) supervisory circuits provide maximum adjustability for supply-voltage monitoring and reset functionality. in addition, the max6412?ax6420 reset timeout period is adjustable using an external capacitor. the max6412/MAX6413/max6414 have factory- trimmed reset threshold voltages in approximately 100mv increments from 1.575v to 5.0v with a manual reset input. the max6415/max6416/max6417 contain a reset threshold that can be adjusted to any voltage above 1.26v using external resistors. the max6418/ max6419/max6420 offer both a factory-trimmed reset threshold and an adjustable reset threshold input for dual-voltage monitoring. a reset signal is asserted when v cc and/or reset in falls below the preset values or when mr is asserted. the reset remains asserted for an externally pro- grammed interval after v cc and/or reset in has risen above the reset threshold or mr is deasserted. reset output the reset output is typically connected to the reset input of a ?. a ?? reset input starts or restarts the ? in a known state. the max6412?ax6420 ? supervi- sory circuits provide the reset logic to prevent code- execution errors during power-up, power-down, and brownout conditions (see typical operating circuit ). for the MAX6413, max6416, and max6419, reset changes from low to high whenever v cc or reset in drops below the reset threshold voltages. once reset in and v cc exceed their respective reset threshold volt- age(s), reset remains high for the reset timeout period, then goes low. on power-up, once v cc reaches 1v, reset is guaran- teed to be a logic high. for applications requiring valid reset logic when v cc is less than 1v, see the section ensuring a valid reset/ reset output down to v cc = 0v . the active-low reset output of the remaining supervi- sors is the inverse of the MAX6413, max6416, and max6419 active-high reset output and is guaranteed valid for v cc 1v. reset threshold the max6415?ax6420 monitor the voltage on reset in with an external resistor voltage-divider (figure 1). low-power, single/dual-voltage ? reset circuits with capacitor-adjustable reset timeout delay max6412?ax6420 maxim integrated 5 pin description pin max6412/ MAX6413/ max6414 max6415/ max6416/ max6417 max6418/ max6419/ max6420 name function reset reset changes from high to low whenever v cc or reset in drops below the selected reset threshold voltage (v th or v reset in , respectively) or manual reset is pulled low. reset remains low for the reset timeout period after all reset conditions are deasserted and then goes high. 111 reset reset changes from low to high whenever the v cc or reset in drops below the selected reset threshold voltage (v th or v reset in ) or manual reset is pulled low. reset remains high for the reset timeout period after all reset conditions are deasserted and then goes low. 2 2 2 gnd ground ? 3 reset in reset input. high-impedance input to the adjustable reset comparator. connect reset in to the center point of an external resistor-divider network to set the threshold of the externally monitored voltage. see reset threshold section. 3 mr manual reset input. pull this pin low to manually reset the device. reset remains asserted for the reset timeout period after mr is released. 444s r t set reset timeout input. connect a capacitor between srt and ground to set the timeout period. determine the period as follows: t rp = (2.71 x 10 6 ) ? c srt + 275? with t rp in seconds and c srt in farads. 555v cc supply voltage and input for fixed-threshold v cc monitor
use the following formula to calculate the externally monitored voltage (v mon_th ): v mon_th = v rst (r1 + r2)/r2 where v mon_th is the desired reset threshold voltage and v rst is the reset input threshold (1.26v). resistors r1 and r2 can have very high values to minimize cur- rent consumption due to low leakage currents. set r2 to some conveniently high value (1m ? , for example) and calculate r1 based on the desired monitored volt- age, using the following formula: r1 = r2 x (v mon_th /v rst - 1) (?) manual reset input (max6412/MAX6413/max6414) many ?-based products require manual reset capabil- ity, allowing the operator, a 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 timeout period after mr returns high. the mr has an internal 20k? pullup resistor so it can be left open if not used. connect a normally open momentary switch from mr to ground to create a man- ual reset function (external debounce circuitry is not required for long reset timeout periods). a manual reset option can easily be implemented with the max6415?ax6420 by connecting a normally open momentary switch in parallel with r2 (figure 2). when the switch is closed, the voltage on reset in goes to zero, initiating a reset. similar to the max6412/MAX6413/ max6414 manual reset, reset remains asserted while the switch is closed and for the reset timeout period after the switch is opened. monitoring voltages other than v cc (max6415/max6416/max6417) the max6415/max6416/max6417 contain an adjustable reset threshold input. these devices can be used to monitor voltages other than v cc . calculate v mon_th as shown in the reset threshold section. (see figure 3.) low-power, single/dual-voltage ? reset circuits with capacitor-adjustable reset timeout delay max6412?ax6420 6 maxim integrated max6415 max6416 max6417 srt gnd reset in v cc r1 v mon_th v mon_th = 1.26 x (r1 + r2)/r2 r2 figure 1. calculating the monitored threshold voltage (v mon_th ) max6415 max6420 srt gnd reset in v cc r1 v cc r2 figure 2. adding an external manual reset function to the max6415?ax6420 max6415 max6416 max6417 srt gnd reset in v cc v cc r1 v mon_th r2 figure 3. monitoring external voltages
dual-voltage monitoring (max6418/max6419/max6420) the max6418/max6419/max6420 contain both facto- ry-trimmed threshold voltages and an adjustable reset threshold input, allowing the monitoring of two voltages, v cc and v mon_th (see figure 4). reset is asserted when either of the voltages falls below its respective threshold voltage. application information selecting a reset capacitor the reset timeout period is adjustable to accommodate a variety of ? applications. adjust the reset timeout period (t rp ) by connecting a capacitor (c srt ) between srt and ground. calculate the reset timeout capacitor as follows: c srt = (t rp - 275?) / (2.71 10 6 ) where t rp is in seconds and c srt is in farads the reset delay time is set by a current/capacitor-con- trolled ramp compared to an internal 0.65v reference. an internal 240na ramp current source charges the external capacitor. the charge to the capacitor is cleared when a reset condition is detected. once the reset condition is removed, the voltage on the capacitor ramps according to the formula: dv/dt = i/c. the c srt capacitor must ramp to 0.65v to deassert the reset. c srt must be a low-leakage (<10na) type capacitor, ceramic is recommended. operating as a voltage detector the max6412?ax6420 can be operated in a voltage detector mode by leaving srt unconnected. the reset delay times for v cc rising above or falling below the threshold are not significantly different. the reset output is deasserted smoothly without false pulses. low-power, single/dual-voltage ? reset circuits with capacitor-adjustable reset timeout delay max6412?ax6420 maxim integrated 7 reset circuitry laser-trimmed resistors v cc v cc 1.26v reset in gnd r1 r2 srt c srt (reset) reset v mon_th max6418 max6419 max6420 max6420 only r l p figure 4. max6418/max6419/max6420 monitoring two voltages
interfacing to other voltages for logic compatibility the open-drain outputs of the max6414/max6417/ max6420 can be used to interface to ?s with other logic levels. as shown in figure 5, the open-drain out- put can be connected to voltages from 0 to 5.5v. this allows for easy logic compatibility to various micro- processors. negative-going v cc transients in addition to issuing a reset to the ? during power-up, power-down, and brownout conditions, these supervisors are relatively immune to short-duration negative-going transients (glitches). the maximum transient duration vs. reset threshold overdrive graph in the typical operating characteristics shows this relationship. the area below the curve of the graph is the region in which these devices typically do not generate a reset pulse. this graph was generated using a negative- going pulse applied to v cc , starting above the actual reset threshold (v th ) and ending below it by the magni- tude indicated (reset-threshold overdrive). as the mag- nitude of the transient decreases (farther below the reset threshold), the maximum allowable pulse width decreases. typically, a v cc transient that goes 100mv below the reset threshold and lasts 50? or less will not cause a reset pulse to be issued. ensuring a valid reset or reset down to v cc = 0v when v cc falls below 1v, reset/reset current sink- ing (sourcing) capabilities decline drastically. in the case of the max6412, max6415, and max6418, high- impedance cmos-logic inputs connected to reset can drift to undetermined voltages. this presents no problems in most applications, since most ?s and other circuitry do not operate with v cc below 1v. in those applications where reset must be valid down to 0, adding a pulldown resistor between reset and ground sinks any stray leakage currents, holding reset low (figure 6). the value of the pulldown resis- tor is not critical; 100k ? is large enough not to load reset and small enough to pull reset to ground. for applications using the MAX6413, max6416, and max6419, a 100k? pullup resistor between reset and v cc will hold reset high when v cc falls below 1v (figure 7). open-drain reset versions are not recom- mended for applications requiring valid logic for v cc down to 0v. low-power, single/dual-voltage ? reset circuits with capacitor-adjustable reset timeout delay max6412?ax6420 8 maxim integrated max6414 max6417 max6420 v cc gnd 3.3v 5.0v reset 10k? 5v system figure 5. max6414/max6417/max6420 open-drain reset output allows use with multiple supplies max6412 max6415 max6418 gnd v cc v cc reset 100k? figure 6. ensuring reset valid to v cc = 0v MAX6413 max6416 max6419 gnd v cc v cc reset 100k? figure 7. ensuring reset valid to v cc = 0v
layout consideration srt is a precise current source. when developing the layout for the application, be careful to minimize board capacitance and leakage currents around this pin. traces connected to srt should be kept as short as possible. traces carrying high-speed digital signals and traces with large voltage potentials should be rout- ed as far from srt as possible. leakage current and stray capacitance (e.g., a scope probe) at this pin could cause errors in the reset timeout period. when evaluating these parts, use clean prototype boards to ensure accurate reset periods. reset in is a high-impedance input, which is typically driven by a high-impedance resistor-divider network (e.g., 1m? to 10m? ). minimize coupling to transient sig- nals by keeping the connections to this input short. any dc leakage current at reset in (e.g., a scope probe) causes errors in the programmed reset threshold. chip information transistor count: 325 process: bicmos low-power, single/dual-voltage ? reset circuits with capacitor-adjustable reset timeout delay max6412?ax6420 maxim integrated 9 table 1. reset voltages suffix table suffix min typ max 16 1.536 1.575 1.614 17 1.623 1.665 1.707 18 1.755 1.800 1.845 19 1.853 1.900 1.948 20 1.950 2.000 2.050 21 2.048 2.100 2.153 22 2.133 2.188 2.243 23 2.313 2.313 2.371 24 2.340 2.400 2.460 25 2.438 2.500 2.563 26 2.559 2.625 2.691 27 2.633 2.700 2.768 28 2.730 2.800 2.870 29 2.852 2.925 2.998 30 2.925 3.000 3.075 31 2.998 3.075 3.152 32 3.120 3.200 3.280 33 3.218 3.300 3.383 34 3.315 3.400 3.485 35 3.413 3.500 3.558 36 3.510 3.600 3.690 37 3.608 3.700 3.793 38 3.705 3.800 3.895 39 3.803 3.900 3.998 40 3.900 4.000 4.100 41 3.998 4.100 4.203 42 4.095 4.200 4.305 43 4.193 4.300 4.408 44 4.266 4.375 4.484 45 4.388 4.500 4.613 46 4.509 4.625 4.741 47 4.583 4.700 4.818 48 4.680 4.800 4.920 49 4.778 4.900 5.023 50 4.875 5.000 5.125
low-power, single/dual-voltage ? reset circuits with capacitor-adjustable reset timeout delay max6412?ax6420 10 maxim integrated part* top mark max6412uk16-t advy max6412uk22-t adwa max6412uk26-t adwc max6412uk29-t adwd max6412uk46-t adwg MAX6413uk16-t adwi MAX6413uk22-t adwk MAX6413uk26-t adwm MAX6413uk29-t adwn MAX6413uk46-t adwq max6414uk16-t adws max6414uk22-t adwu max6414uk26-t adww max6414uk29-t adwx max6414uk46-t adxa max6415uk-t adzo max6416uk-t adzp max6417uk-t adzq max6418uk16-t adyg max6418uk22-t adyi max6418uk26-t adyk max6418uk29-t adyl max6418uk46-t adyo max6419uk16-t adyq max6419uk22-t adys max6419uk26-t adyu max6419uk29-t adyv max6419uk46-t adyy max6420uk16-t adza max6420uk22-t adzc max6420uk26-t adze max6420uk29-t adzf max6420uk46-t adzi standard versions table * sample stock is generally held on all standard versions. contact factory for availability of nonstandard versions.
low-power, single/dual-voltage ? reset circuits with capacitor-adjustable reset timeout delay max6412?ax6420 maxim integrated 11 part fixed v th manual reset reset in push-pull reset push-pull reset open-drain reset max6412 ?? ? MAX6413 ?? ? max6414 ?? ? max6415 ?? max6416 ? ? max6417 ? ? max6418 ? ?? max6419 ? ? ? max6420 ? ? ? selector guide typical operating circuit max6412 MAX6413 max6414 srt gnd v cc v cc mr reset/reset p reset/reset package information for the latest package outline information and land patterns (footprints), go to www.maximintegrated.com/packages . note that a ?? ?? or ??in the package code indicates rohs status only. package drawings may show a different suffix character, but the drawing pertains to the package regardless of rohs status. package type package code outline no. land pattern no. 5 sot23 u5-2 21-005 7 90-0174
low-power, single/dual-voltage ? reset circuits with capacitor-adjustable reset timeout delay max6412?ax6420 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. 12 maxim integrated 160 rio robles, san jose, ca 95134 usa 1-408-601-1000 ? 2012 maxim integrated products, inc. the maxim logo and maxim integrated are trademarks of maxim integrated products, inc. revision history revision number revision date description pages changed 0 01/02 initial release 1 8/03 corrected top marks 10 2 12/05 added lead-free information in ordering information 1 3 3/10 deleted reset in hysteresis parameter in the electrical characteristics table 3 4 2/11 corrected formula for srt 5, 7 5 8/12 added automotive qualified part to ordering information 1

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