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general description the max6351?ax6360 microprocessor (?) supervi- sors with multiple reset voltages significantly improve system reliability and accuracy compared to separate ics or discrete components. if any input supply voltage drops below its associated preset threshold, all reset outputs are asserted. in addition, the outputs are valid as long as either input supply voltage remains greater than +1.0v. all devices in this series have an active-low debounced manual reset input. in addition, the max6358/max6359/ max6360 offer a watchdog-timer input with a 46.4s startup timeout period and a 2.9s timeout period. the max6355/max6356/max6357 offer an additional volt- age monitor input to monitor a third voltage. the max6351 features both 3v and 5v active-low push- pull reset outputs. the max6353/max6356/max6359 offer a 5v active-low push-pull reset. the max6354/ max6357/max6360 offer a 3v active-low push-pull reset. the max6352/max6355/max6358? reset is active-low open-drain. all these devices are offered with a wide variety of volt- age threshold levels, as shown in the voltage threshold levels table. they are available in 5- and 6-pin sot23 packages and operate over the extended (-40? to +85?) temperature range. features precision monitoring of multiple +1.8v, +2.5v, +3.0v, +3.3v, and +5v power-supply voltages precision factory-set power-supply reset thresholds 20a supply current 100ms min power-on reset pulse width debounced ttl/cmos-compatible manual-reset input watchdog timer 46.4s startup timeout 2.9s normal timeout fully guaranteed over temperature guaranteed reset valid to v cc 5 = 1v or v cc 3 = 1v power-supply transient immunity no external components for dual-voltage systems small 5- and 6-pin sot23 packages low cost applications computers intelligent instruments controllers multivoltage systems portable/battery-powered equipment max6351?ax6360 dual/triple-voltage ? supervisory circuits ________________________________________________________________ maxim integrated products 1 19-1508; rev 3; 6/01 * the _ _ are placeholders for the threshold voltage levels of the devices. substitute the part number suffix in the voltage thres- hold levels table for the desired voltage level. all devices are available in tape-and-reel only. there is a 2500 piece minimum order increment for the sot package. ordering information part* max6351 _ _ut-t max6352 _ _uk-t max6353 _ _uk-t -40? to +85? -40? to +85? -40? to +85? temp. range pin-package 6 sot23-6 5 sot23-5 5 sot23-5 max6354 _ _uk-t max6355 _ _ut-t max6356 _ _ut-t -40? to +85? -40? to +85? -40? to +85? 5 sot23-5 6 sot23-6 6 sot23-6 max6357 _ _ut-t max6358 _ _ut-t max6359 _ _ut-t -40? to +85? -40? to +85? -40? to +85? 6 sot23-6 6 sot23-6 6 sot23-6 max6360 _ _ut-t -40? to +85? 6 sot23-6 note: standard versions are shown in bold. sample stock is gen- erally held on the standard versions only. contact factory for avail- ability. __________voltage threshold levels pin configurations appear at end of data sheet. selector guide appears at end of data sheet. 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. part no. suffix (_ _) v cc 5 nominal voltage threshold (v) v cc 3 nominal voltage threshold (v) lt 4.63 3.08 ls 4.63 2.93 lr 4.63 2.63 mt 4.38 3.08 ms 4.38 2.93 mr 4.38 2.63 tz 3.08 2.32 ty 3.08 2.19 tw 3.08 1.67 tv 3.08 1.58 sz 2.93 2.32 sy 2.93 2.19 sw 2.93 1.67 sv 2.93 1.58 uw 2.78 1.67 uv 2.78 1.58 rw 2.63 1.67 rv 2.63 1.58
max6351?ax6360 dual/triple-voltage ? supervisory circuits 2 _______________________________________________________________________________________ absolute maximum ratings 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 5, v cc 3 to gnd .................................................-0.3v to +6v rst (max6352/max6355/max6358)...................... -0.3v to +6v rst , mr , wdi, rst5 , rstin (max6351/max6353/ max6356/max6359) ..............................-0.3v to (v cc 5 + 0.3v) rst , rst3 (max6351/max6354/ max6357/max6360) ..............................-0.3v to (v cc 3 + 0.3v) input/output current, all pins .............................................20ma continuous power dissipation (t a = +70 c) 5-pin sot23 (derate 7.1mw/ c above +70 c)............571mw 6-pin sot23 (derate 8.7mw/ c above +70 c)............695mw operating temperature range ...........................-40 c to +85 c junction temperature .....................................................+150 c storage temperature range .............................-65 c to +150 c electrical characteristics (v cc 3 = v cc 5 = +1.2v to +5.5v, t a = -40 c to +85 c, unless otherwise noted. typical values are at t a = +25 c.) (note 1) parameter symbol conditions min typ max units t a = 0 c to +70 c 1.0 5.5 supply voltage v cc t a = -40 c to +85 c 1.2 5.5 v supply current i cc 5 + i cc 3 v cc 5 = 5.5v, v cc 3 = 3.6v, all i/o pins open 20 50 a t a = +25 c 4.54 4.63 4.72 max63_ _l_ t a = -40 c to +85 c 4.5 4.75 t a = +25 c 4.3 4.38 4.46 max63_ _m_ t a = -40 c to +85 c 4.25 4.50 t a = +25 c 3.03 3.08 3.14 max63_ _t_ t a = -40 c to +85 c 3.00 3.15 t a = +25 c 2.88 2.93 2.98 max63_ _s_ t a = -40 c to +85 c 2.85 3.00 t a = +25 c 2.74 2.78 2.82 max63_ _u_ t a = -40 c to +85 c 2.70 2.85 t a = +25 c 2.58 2.63 2.68 v cc 5 threshold (note 3) v th 5 max63_ _r_ t a = -40 c to +85 c 2.55 2.70 v t a = +25 c 3.03 3.08 3.14 max63_ _ _t t a = -40 c to +85 c 3.00 3.15 t a = +25 c 2.88 2.93 2.98 max63_ _ _s t a = -40 c to +85 c 2.85 3.00 t a = +25 c 2.58 2.63 2.68 max63_ _ _r t a = -40 c to +85 c 2.55 2.70 t a = +25 c 2.28 2.32 2.35 max63_ _ _z t a = -40 c to +85 c 2.25 2.38 t a = +25 c 2.16 2.19 2.22 max63_ _ _y t a = -40 c to +85 c 2.13 2.25 t a = +25 c 1.64 1.67 1.70 max63_ _ _w t a = -40 c to +85 c 1.62 1.71 t a = +25 c 1.55 1.58 1.61 v cc 3 threshold (note 3) v th 3 max63_ _ _v t a = -40 c to +85 c 1.53 1.62 v
max6351?ax6360 dual/triple-voltage ? supervisory circuits _______________________________________________________________________________________ 3 electrical characteristics (continued) (v cc 3 = v cc 5 = +1.2v to +5.5v, t a = -40 c to +85 c, unless otherwise noted. typical values are at t a = +25 c.) (note 1) parameter symbol conditions min typ max units reset threshold tempco ? v th / c 20 ppm/ c reset threshold hysteresis v th /500 v v cc to reset delay 100mv overdrive 20 s reset timeout period t rp v cc 5 > v th 5 (max) , v cc 3 > v th 3 (max) 100 180 280 ms v cc 5 or v cc 3 2.7v, i sink = 1.2ma 0.3 v cc 5 or v cc 3 4.5v, i sink = 3.2ma 0.4 v cc 5 or v cc 3 1v, i sink = 50 a, t a = 0 c to +70 c 0.3 reset output voltage low v ol v cc 5 or v cc 3 1.2v, i sink = 50 a; t a = -40 c to +85 c 0.3 v (_w, _v versions only), v cc 5 > v th 5 (max) , v cc 3 > v th 3 (max) i source = 350 a 0.8 v cc (_y versions only), v cc 5 > v th 5 (max) , v cc 3 > v th 3 (max) i source = 500 a 0.8 v cc reset output voltage high (max6351/max6353/max6354/ max6356/max6357/max6359/ max6360 only) v oh (_t, _s, _r versi ons only) , v cc 5 > v th 5 (max) , v cc 3 > v th 3 (max) i source = 800 av cc - 1.5 v watchdog input (max6358/max6359/max6360) first timeout period after reset 25.6 46.4 72.0 watchdog timeout period t wd after first wdi falling edge 1.6 2.9 4.5 s wdi pulse width (note 4) t wdi v il = 0.4v, v ih = 0.8 x v cc 50 ns v il 0.3 x v cc wdi input voltage (note 5) v ih v cc 5 = 5v 0.7 x v cc v v wdi = v cc 120 160 wdi input current (note 6) v wdi = 0 -20 -15 a manual reset input v il max63_ _l_, max63_ _m_, v cc 5 > v th 5 ( max ) 0.8 v ih max63_ _l_, max63_ _m_, v cc 5 > v th 5 ( max ) 2.3 v il max63_ _ _y, v cc 5 > v th 5 (max) 0.3 x v cc mr input voltage v ih max63_ _ _y, v cc 5 > v th 5 (max) 0.7 x v cc v
max6351?ax6360 dual/triple-voltage ? supervisory circuits 4 _______________________________________________________________________________________ typical operating characteristics (v cc = +5v, t a = +25 c, unless otherwise noted.) 0 5 10 15 20 -40 10 -15 35 60 85 supply current vs. temperature max6351/60-01 temperature (?) supply current ( a) i cc 5 (v cc 5 = 5.0v, v cc 3 = 3.3v) i cc 3 (v cc 5 = 5.0v, v cc 3 = 3.3v) i cc 3 (v cc 5 = 3.3v, v cc 3 = 2.5v) i cc 5 (v cc 5 = 3.3v, v cc 3 = 2.5v) v cc 5 (v) reset vs. v cc 5 (v cc 3 > v th 3) v th 0 1.0 0.5 2.0 1.5 3.0 2.5 3.5 4.5 4.0 5.0 0 1.0 1.5 2.0 0.5 2.5 3.0 3.5 4.5 4.0 5.0 max6351/60-02 reset (v) max6356l_ 0 1.0 0.5 2.0 1.5 3.0 2.5 3.5 4.5 4.0 5.0 0 1.0 1.5 2.0 0.5 2.5 3.0 3.5 4.5 4.0 5.0 max6351/60-03 v cc 5 (v) reset (v) reset vs. v cc 5 (v cc 3 = gnd) parameter symbol conditions min typ max units mr pullup resistance 32 63.5 100 k ? mr minimum pulse width t rp 1 s mr glitch rejection 100 ns mr to reset delay t md 0.1 s adjustable reset comparator input (max6355/max6356/max6357) t a = +25 c 1.20 1.22 1.24 rstin input threshold v rstin v cc 5 > v th 5 (max) , v cc 3 > v th 3 (max) t a = -40 c to +85 c 1.19 1.25 v rstin input current i rstin 0 < v rstin < v cc 5 - 0.3v -25 25 na rstin hysteresis 2.5 mv note 1: overtemperature limits are guaranteed by design and not production tested. note 2: the reset output is guaranteed to be in the correct state if either v cc 3 or v cc 5 is within its specified region of operation. note 3: the reset output(s) is asserted if either v cc 5 or v cc 3 drops below its associated trip point. note 4: guaranteed by design. not production tested. note 5: wdi is internally serviced within the watchdog timeout period if wdi is left unconnected. note 6: the wdi input current is specified as the average input current when the wdi input is driven high or low. electrical characteristics (continued) (v cc 3 = v cc 5 = +1.2v to +5.5v, t a = -40 c to +85 c, unless otherwise noted. typical values are at t a = +25 c.) (note 1)
max6351?ax6360 dual/triple-voltage ? supervisory circuits _______________________________________________________________________________________ 5 0.80 0.90 0.85 1.00 0.95 1.05 1.10 1.15 1.20 -60 -20 0 -40 20406080100 normalized reset/watchdog period vs. temperature max6351/60-04 temperature ( c) normalized period open-drain output 0 0 0 5v 3v 5v push-pull output 3v push-pull output 5v pullup characteristics max6351/60-07 400ns/div r pullup = 100k ? c load = 10pf 300 0 0.01 0.1 1 maximum v cc transient duration vs. reset threshold overdrive 100 50 max6351/60-05 reset threshold overdrive, v rst - v cc (v) transient duration ( s) 150 200 250 reset occurs above line 0 50 100 150 200 250 0 0.4 0.5 0.2 0.3 0.1 0.6 0.7 0.8 0.9 1.0 reset delay vs. reset threshold overdrive max6351/60-06 reset threshold overdrive, v rst - v cc (v) reset delay ( s) delay from fall of v cc 5 delay from fall of v cc 3 0 5v manual reset input to output delay 40ns/div 0 5v mr max6351/60-08 0 0 5v 5v open-drain output 5v push-pull output 3v push-pull output r pullup = 100k ? c load = 10pf typical operating characteristics (continued) (v cc = +5v, t a = +25 c, unless otherwise noted.)
max6351?ax6360 dual/triple-voltage ? supervisory circuits 6 _______________________________________________________________________________________ pin description pin max6351 max6352 max6353 max6354 max6355 max6356 max6357 max6358 max6359 max6360 name function active-low, 5v cmos reset output rst5 1 1 1 1 rst active-low reset output. open drain for the max6352/max6355/max6358, 5v push-pull for the max6353/max6356/max6359, and 3v push-pull for the max6354/max6357/max6360. 2 2 2 2 gnd ground manual-reset input. pull low to force a reset. rst , rst5 , and rst3 remain active as long as mr is low and for the timeout period after mr goes high. leave unconnected or connect to v cc 5 if unused. v mr must be below v cc 5. mr 3 3 3 3 4 4 4 4 v cc 3 +3.3v/+3.0v/+2.5v/+1.8v supply input. powers the device when it is above v cc 5 and monitors its own voltage. active-low, 3v cmos reset output rst3 5 5 rstin undervoltage reset comparator input. asserts reset when the monitored voltage falls below 1.22v. set the reset threshold with an external resistive divider. connect to v cc 5 if unused. v rstin must be below v cc 5. watchdog input. if wdi remains either high or low longer than the timeout period, then reset is trig- gered. the timer clears when reset is asserted or whenever wdi sees a rising or falling edge. leave floating to disable it if unused. wdi 5 6 5 6 6 v cc 5 +5.0/+3.3v/+3.0v supply input. powers the device when it is above v cc 3 and monitors its own voltage.
max6351?ax6360 dual/triple-voltage ? supervisory circuits _______________________________________________________________________________________ 7 detailed description supply voltages the max6351 max6360 microprocessor (p) superviso- ry circuits maintain system integrity by alerting the p to fault conditions. these ics monitor multiple-supply sys- tems. the output reset state is guaranteed to remain viable while either v cc 5 or v cc 3 is above +1v. threshold levels all the possible input voltage threshold level combina- tions are indicated by a two-letter code in the voltage threshold levels table. reset outputs the max6351 provides a +5v active-low reset and a +3v active-low reset. the max6353/max6356/max6359 provide a +5v active-low push-pull reset and the max6354/max6357/max6360 provide a +3v active-low push-pull reset. the max6352/max6355/max6358 pro- vide an active-low open-drain reset. the higher input voltages of v cc 5 and v cc 3 maintain the sinking capa- bility of the low reset-output state. the reset outputs are maintained as long as either supply is above +1v. negative-going v cc transients the max6351 max6360 are designed to ignore short negative-going v cc 5 and v cc 3 transients. see the maximum v cc transient duration vs. reset threshold overdrive graph in the typical operating characteris- tics. third input voltage (max6355/max6356/max6357) the max6355/max6356/max6357 provide an addition- al input to monitor a third voltage. the threshold voltage at rstin is typically 1.22v. to monitor a voltage higher than 1.22v, connect a resistive divider to the circuit as shown in figure 2. the threshold at v ext is: note that rstin is powered by v cc 5, and its voltage must therefore remain lower than or equal to v cc 5. watchdog input (max6358/max6359/max6360) the max6358/max6359/max6360 include a dual- mode watchdog timer to monitor p activity. the flexi- ble timeout architecture provides a startup mode, allowing complicated systems to complete lengthy boots, and a normal mode, allowing the supervisor to provide quick alerts when processor activity fails. v 1.22v r1 r2 r2 ext_th = + ? ? ? ? ? ? watchdog timer v cc 5 (5) 6 4 (5) (5) 2 gnd note: pin 1 is rst5 for the max6351 and rst for the max6352 max6360. pin 5 is rst3 for the max6351, rstin for the max6355/max6356/max6357, wdi for the max6358/ max6359/max6360, and v cc 5 for the max6352/max6353/max6354. v cc 3 mr (rstin) rst (1) rst3 (5) (1) rst5 (wdi) reset generator glitch filter max6351?ax6360 v th 5 v th 3 1.22v 3 figure 1. functional diagram figure 2. monitoring a third voltage v ext r1 r2 v cc 5 v rstin rstin max6355 max6356 max6357
max6351?ax6360 dual/triple-voltage ? supervisory circuits 8 _______________________________________________________________________________________ during the normal operating mode, the supervisor will issue a reset pulse for the reset timeout period (140ms min) if the p does not update the wdi with a valid tran- sition (high to low or low to high) within the stan- dard timeout period (1.6s min). after each reset event (v cc power-up, manual reset, or watchdog reset), there is an initial watchdog startup timeout period of 25.6s. the startup mode provides an extended period for the system to power up and fully initialize all p and system components before assum- ing responsibility for routine watchdog updates. the normal watchdog timeout period (1.6s min) begins at the conclusion of the startup timeout period or after the first transition on wdi before the conclusion of the start- up period (figure 3). applications information ensuring a valid reset output down to v cc = 0 in some systems, it is necessary to ensure a valid reset even if v cc falls to 0. in these applications, use the cir- cuit shown in figure 4. note that this configuration does not work for the open-drain outputs of the max6352/ max6355/max6358. interfacing to ?s with bidirectional reset pins microprocessors with bidirectional reset pins will con- tend with the push-pull outputs of these devices. to prevent this, connect a 4.7k ? resistor between reset and the p s reset i/o port, as shown in figure 5. buffer reset as shown in the figure if this reset is used by other components in the system. figure 4. ensuring a valid reset low to v cc 5 and v cc 3 = 0 v cc 3v cc 5 gnd 100k rst3 rst5 rst max6351 max6356 max6353 max6357 max6354 max6359 max6360 v cc 3 v cc 5 figure 5. interfacing to ?s with bidirectional reset i/o buffered reset to other system components 4.7k gnd reset p gnd rst3 rst5 rst max6351 max6360 v cc 3 v cc 3 v cc 5 v cc 5 1.6s max t wdi-normal 1.6s max t wdi-startup 25.6s max v th v cc wdi reset 140ms figure 3. normal watchdog startup sequence chip information transistor count: 855
gnd v cc 3 mr 16 v cc 5 5 rst3 rst5 max6351 sot23-6 top view 2 34 gnd v cc 3 mr 16 v cc 5 5 rstin rst* max6355 max6356 max6357 sot23-6 2 34 gnd v cc 3 mr *max6355: open-drain output *max6356: 5v push-pull output *max6357: 3v push-pull output *max6358: open-drain output *max6359: 5v push-pull output *max6360: 3v push-pull output *max6352: open-drain output *max6353: 5v push-pull output *max6354: 3v push-pull output 16 v cc 5 5 wdi rst* max6358 max6359 max6360 sot23-6 2 34 gnd v cc 3 mr 15 v cc 5 rst* max6352 max6353 max6354 sot23-5 2 34 ? ? ? ? 2 6 max6360 2 6 max6359 watchdog timer ? ? ? ? ? ? ? open-drain reset ? 3v reset ? ? 5v reset 3 6 3 6 max6357 2 5 max6356 3 6 max6355 max6354 2 5 2 5 max6353 number of supplies monitored 2 6 pin count max6352 2 6 max6351 part max6358 ? ? ? ? ? ? ? ? manual reset ? ? selector guide pin configurations _______________________________________________________________________________________ 9
max6351?ax6360 dual/triple-voltage ? supervisory circuits 10 ______________________________________________________________________________________ 6lsot.eps package information
max6351?ax6360 dual/triple-voltage ? supervisory circuits sot5l.eps 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. 11 ____________________maxim integrated products, 120 san gabriel drive, sunnyvale, ca 94086 408-737-7600 ? 2001 maxim integrated products printed usa is a registered trademark of maxim integrated products. package information (continued)

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