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general description the max63 51Cmax6360 microprocessor (p) 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 voltage-monitor input to monitor a third voltage. the max6351 features two active-low, push-pull reset outputs, one is referenced to v cc 1 and the other is refer - enced to v cc 2. the max6353/max6356/max6359 offer an active-low, push-pull reset output referenced to vcc1. the max6354/max6357/max6360 offer an active-low, push-pull reset output referenced to v cc 2. all these devices are offered with a wide variety of voltage threshold levels, as shown in the voltage-threshold levels table. they are available in 5- and 6-pin sot23 packages and oper - ate over the extended (-40c to +85c) 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 1 = 1v or v cc 2 = 1v power-supply transient immunity no external components for dual-voltage systems small 5- and 6-pin sot23 packages low cos t applications note: standard versions are shown in bold . sample stock is generally held on the standard versions only. contact factory for availability. *the _ _ are placeholders for the threshold voltage levels of the devices. substitute the part number suffix in the voltage threshold 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.devices are available in both leaded and lead(pb)-free packag - ing. specify lead-free by replacing -t with +t when ordering.pin configurations appear at end of data sheet. selector guide appears at end of data sheet. 19-1508; rev 7; 5/14 computers controllers portable/battery- powered equipment intelligent instruments multivoltage systems part no. suffix (_ _) v cc 1 nominal voltage threshold (v) v cc 2 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 part temp range pin-package max6351 _ _ut-t -40c to +85c 6 sot23 max6352 _ _uk-t -40c to +85c 5 sot23 max6353 _ _uk-t -40c to +85c 5 sot23 max6354 _ _uk-t -40c to +85c 5 sot23 max6355 _ _ut-t -40c to +85c 6 sot23 max6356 _ _ut-t -40c to +85c 6 sot23 max6357 _ _ut-t -40c to +85c 6 sot23 max6358 _ _ut-t -40c to +85c 6 sot23 max6359 _ _ut-t -40c to +85c 6 sot23 max6360 _ _ut-t -40c to +85c 6 sot23 max6351Cmax6360 dual/triple-voltage p supervisory circuits voltage threshold levels ordering information downloaded from: http:///
v cc 1, v cc 2 to gnd ...............................................-0.3v to +6v rst (max6352/max6355/max6358) ....................-0.3v to +6v rst , mr , wdi, rst1 , rstin (max6351/max6353/ max6356/max6359) .......................... -0.3v to (v cc 1 + 0.3v) rst , rst2 (max6351/max6354/ max6357/max6360) .......................... -0.3v to (v cc 2 + 0.3v) input/output current, all pins .............................................20ma continuous power dissipation (t a = +70c) 5-pin sot23 (derate 7.1mw/c above +70c) ..........571mw 6-pin sot23 (derate 8.7mw/c above +70c) ..........695mw operating temperature range ........................... -40c to +85c junction temperature ......................................................+150c storage temperature range ............................ -65c to +150c (v cc 1 = v cc 2 = +1.2v to +5.5v, t a = -40c to +85c, unless otherwise noted. typical values are at t a = +25c.) (note 1) parameter symbol conditions min typ max units supply voltage (note 2) v cc 1, v cc 2 t a = 0c to +70c 1.0 5.5 v t a = -40c to +85c 1.2 5.5 supply current i cc 1 + i cc 2 v cc 1 = 5.5v, v cc 2 = 3.6v, all i/o pins open 20 50 a v cc 1 threshold (note 3) v th 1 max63_ _l_ t a = +25c 4.54 4.63 4.72 v t a = -40c to +85c 4.5 4.75 max63_ _m_ t a = +25c 4.3 4.38 4.46 t a = -40c to +85c 4.25 4.50 max63_ _t_ t a = +25c 3.03 3.08 3.14 t a = -40c to +85c 3.00 3.15 max63_ _s_ t a = +25c 2.88 2.93 2.98 t a = -40c to +85c 2.85 3.00 max63_ _u_ t a = +25c 2.74 2.78 2.82 t a = -40c to +85c 2.70 2.85 max63_ _r_ t a = +25c 2.58 2.63 2.68 t a = -40c to +85c 2.55 2.70 v cc 2 threshold (note 3) v th 2 max63_ _ _t t a = +25c 3.03 3.08 3.14 v t a = -40c to +85c 3.00 3.15 max63_ _ _s t a = +25c 2.88 2.93 2.98 t a = -40c to +85c 2.85 3.00 max63_ _ _r t a = +25c 2.58 2.63 2.68 t a = -40c to +85c 2.55 2.70 max63_ _ _z t a = +25c 2.28 2.32 2.35 t a = -40c to +85c 2.25 2.38 max63_ _ _y t a = +25c 2.16 2.19 2.22 t a = -40c to +85c 2.13 2.25 max63_ _ _w t a = +25c 1.64 1.67 1.70 t a = -40c to +85c 1.62 1.71 max63_ _ _v t a = +25c 1.55 1.58 1.61 t a = -40c to +85c 1.53 1.62 max6351Cmax6360 dual/triple-voltage p supervisory circuits www.maximintegrated.com maxim integrated 2 absolute maximum ratings stresses beyond those listed under absolute 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. electrical characteristics downloaded from: http:///
(v cc 1 = v cc 2 = +1.2v to +5.5v, t a = -40c to +85c, unless otherwise noted. typical values are at t a = +25c.) (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 1 > v th 1 (max), v cc 2 > v th 2 (max) 100 180 280 ms reset output voltage low v ol v cc 1 or v cc 2 2.7v, i sink = 1.2ma 0.3 v v cc 1 or v cc 2 4.5v, i sink = 3.2ma 0.4 v cc 1 or v cc 2 1v, i sink = 50a, t a = 0c to +70c 0.3 v cc 1 or v cc 2 1.2v, isink = 50a; t a = -40c to +85c 0.3 reset output-voltage high (max6351/max6353/max6354/max6356/max6357/max6359/ max6360 only) v oh (_w, _v versions only), v cc 1 > v th 1 (max) , v cc 2 > v th 2 (max) i source = 350a 0.8 x v cc v (_y versions only), v cc 1 > v th 1 (max) , v cc 2 > v th 2 (max) i source = 500a 0.8 x v cc (_t, _s, _r versions only), v cc 1 > v th 1 (max) , v cc 2 > v th 2 (max) i source = 800a v cc - 1.5 watchdog input (max6358/max6359/max6360) watchdog timeout period t wd first timeout period after reset 25.6 46.4 72.0 s after irst wdi falling edge 1.6 2.9 4.5 wdi pulse width (note 4) t wdi v il = 0.4v, v ih = 0.8 x v cc 50 ns wdi input voltage (note 5) v il v cc 1 = 5v 0.3 x v cc v v ih 0.65 x v cc wdi input current (note 6) v wdi = v cc 120 160 a v wdi = 0 -20 -15 manual reset input mr input voltage v il max63_ _l_, max63_ _m_, v cc 1 > v th 1 (max) 0.8 v v ih max63_ _l_, max63_ _m_, v cc 1 > v th 1 (max) 2.3 v il max63_ _ _y, v cc 1 > v th 1 (max) 0.3 x v cc v ih max63_ _ _y, v cc 1 > v th 1 (max) 0.7 x v cc max6351Cmax6360 dual/triple-voltage p supervisory circuits www.maximintegrated.com maxim integrated 3 electrical characteristics (continued) downloaded from: http:///
(v cc 1 = v cc 2 = +1.2v to +5.5v, t a = -40c to +85c, unless otherwise noted. typical values are at t a = +25c.) (note 1) 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 1 or v cc 2 is within its specified region of operation. note 3: the reset output(s) is asserted if either v cc 1 or v cc 2 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. (v cc 1 = +5v, t a = +25c, unless otherwise noted.) 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) rstin input threshold v rstin v cc 1 > v th 1(max), v cc 2 > v th 2(max) t a = +25c 1.20 1.22 1.24 v t a = -40c to +85c 1.19 1.25 rstin input current i rstin 0 < v rstin < v cc 1 - 0.3v -25 25 na rstin hysteresis 2.5 mv v cc 1 (v) reset vs. v cc 1 (v cc 2 > v th 2) v th 0 1.00.5 2.01.5 3.02.5 3.5 4.54.0 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 1.00.5 2.01.5 3.02.5 3.5 4.54.0 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 1 (v) reset (v) reset vs. v cc 1 (v cc 2 = gnd) 0 5 10 15 20 -40 10 -15 35 60 85 supply current vs. temperature max6351/60-01 temperature (c) supply current (a) i cc 1 (v cc 1 = 5.0v, v cc 2 = 3.3v) i cc 2 (v cc 1 = 5.0v, v cc 2 = 3.3v) i cc 2 (v cc 1 = 3.3v, v cc 2 = 2.5v) i cc 1 (v cc 1 = 3.3v, v cc 2 = 2.5v) max6351Cmax6360 dual/triple-voltage p supervisory circuits www.maximintegrated.com maxim integrated 4 electrical characteristics (continued) typical operating characteristics downloaded from: http:///
(v cc 1 = +5v, t a = +25c, unless otherwise noted.) 0.80 0.900.85 1.000.95 1.05 1.10 1.15 1.20 -60 -20 0 -40 20 40 60 80 100 normalized reset/watchdog period vs. temperature max6351/60-04 temperature (c) normalized period 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 1 delay from fall of v cc 2 open-drain output 0 0 0 5v3v rst1 push-pull output rst2 push-pull output 5v pullup characteristics max6351/60-07 400ns/div r pullup = 100k ? c load = 10pf 0 5v manual-reset input to output delay 40ns/div 0 5v mr max6351/60-08 0 0 5v 5v open-drain output rst1 push-pull output rst2 push-pull output r pullup = 100k ? c load = 10pf max6351Cmax6360 dual/triple-voltage p supervisory circuits maxim integrated 5 www.maximintegrated.com typical operating characteristics (continued) downloaded from: http:///
pin name description max6351 max6352max6353 max6354 max6355max6356 max6357 max6358max6359 max6360 1 rst1 active-low, cmos reset output referenced to v cc 1 1 1 1 rst active-low reset output. open drain for the max6352/ max6355/max6358, push-pull with respect to v cc 1 for the max6353/max6356/max6359, and push-pull with respect to v cc 2 for the max6354/max6357/max6360. 2 2 2 2 gnd ground 3 3 3 3 mr manual-reset input. pull low to force a reset. rst , rst1 , and rst2 remain active as long as mr is low and for the timeout period after mr goes high. leave unconnected or connect to v cc 1 if unused. v mr must not exceed v cc 1. 4 4 4 4 v cc 2 supply input. powers the device when it is above v cc 1 and monitors its own voltage. 5 rst2 active-low, cmos reset output referenced to v cc 2 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 1 if unused. v rstin must not exceed v cc 1. 5 wdi watchdog input. if wdi remains either high or low longer than the timeout period, then reset is triggered. the timer clears when reset is asserted or whenever wdi sees a rising or falling edge. leave unconnected to disable if unused. 6 5 6 6 v cc 1 supply input. powers the device when it is above v cc 2 and monitors its own voltage. max6351Cmax6360 dual/triple-voltage p supervisory circuits www.maximintegrated.com maxim integrated 6 pin description downloaded from: http:///
detailed description supply voltages the max6351Cmax6360 microprocessor (p) super - visory circuits maintain system integrity by alerting the p to fault conditions. these ics monitor multiple-supply systems. the output reset state is guaranteed to remain viable while either v cc 1 or v cc 2 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 two active-low, push-pull reset outputs, one corresponding to each of its two moni - tored voltages. the max6353/max6356/max6359 have an active-low, push-pull reset output that is referenced to v cc 1. the max6354/max6357/max6360 have an active-low, push-pull reset output that is referenced to v cc 2. the max6352/max6355/max6358 provide an active-low open-drain reset. the reset outputs are main - tained as long as at least one of the supplies is above +1v. negative-going v cc transients the max6351Cmax6360 are designed to ignore short negative-going v cc 1 and v cc 2 transients. see the maximum v cc transient duration vs. reset threshold overdrive graph in the typical operating characteristics . third input voltage (max6355/max6356/max6357) the max6355/max6356/max6357 provide an additional 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: ext_th r1 r2 v 1.22v r2 + ?? = ?? ?? note that rstin is powered by v cc 1, and its voltage must therefore remain lower than or equal to v cc 1. watchdog input (max6358/max6359/max6360) the max6358/max6359/max6360 include a dual-mode watchdog timer to monitor p activity. the flexible timeout architecture provides a startup mode, allowing compli - cated systems to complete lengthy boots, and a normal mode, allowing the supervisor to provide quick alerts when processor activity fails. figure 1. functional diagram figure 2. monitoring a third voltage watchdog timer v cc 1 (5) 6 4 (5)(5) 2 gnd note: pin 1 is rst1 for the max6351 and rst for the max6352Cmax6360. pin 5 is rst2 for the max6351, rstin for the max6355/max6356/max6357, wdi for the max6358/ max6359/max6360, and v cc 1 for the max6352/max6353/max6354. v cc 2 mr (rstin) rst (1) rst2 (5) (1) rst1 (wdi) reset generator glitch filter max6351Cmax6360 v th 1 v th 2 1.22v 3 v ext r1r2 v cc 1 v rstin rstin max6355max6356 max6357 max6351Cmax6360 dual/triple-voltage p supervisory circuits www.maximintegrated.com maxim integrated 7 downloaded from: http:///
during the normal operating mode, the supervisor issues a reset pulse for the reset timeout period (140ms min) if the p does not update the wdi with a valid transition (high to low or low to high) within the standard timeout period (1.6s min). after each reset event (v cc power-up, manual reset, or watchdog reset), there is an initial watchdog startup time - out period of 25.6s. the startup mode provides an extend - ed period for the system to power up and fully initialize all p and system components before assuming responsibil - ity 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 startup 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 circuit shown in figure 4. note that this configuration does not work for the open-drain outputs of the max6352/ max6355/max6358. interfacing to ps with bidirectional reset pins microprocessors with bidirectional reset pins contend with the push-pull outputs of these devices. to prevent this, connect a 4.7k resistor between reset and the ps reset i/o port, as shown in figure 5. buffer reset, as shown in the figure, if this reset is used by other compo - nents in the system. figure 3. normal watchdog startup sequence figure 4. ensuring a valid reset low to v cc 1 and v cc 2 = 0 figure 5. interfacing to ps with bidirectional reset i/o 1.6smax t wdi-normal 1.6s max t wdi-startup 25.6s max v th v cc wdi reset 140ms v cc 2 v cc 1 gnd 100k ? rst2 rst1 rst max6351 max6356max6353 max6357 max6354 max6359 max6360 v cc 2 v cc 1 buffered reset to other system components 4.7k ? gnd reset p gnd rst2 rst1 rst v cc 2 v cc 2 v cc 1 v cc 1 max6351Cmax6360 max6351Cmax6360 dual/triple-voltage p supervisory circuits www.maximintegrated.com maxim integrated 8 downloaded from: http:///
part pin count number of supplies monitored rst1 rst2 open-drain reset watchdog timer manual reset max6351 6 2 max6352 5 2 max6353 5 2 max6354 5 2 max6355 6 3 max6356 6 3 max6357 6 3 max6358 6 2 max6359 6 2 max6360 6 2 gnd v cc 2 mr 1 6 v cc 1 5 rst2 rst1 max6351 6 sot23 top view 2 3 4 gnd v cc 2 mr 1 6 v cc 1 5 rstin rst* max6355max6356 max6357 6 sot23 2 3 4 gnd v cc 2 mr *max6355: open-drain output*max6356: push-pull output (v cc 1) *max6357: push-pull output (v cc 2) *max6358: open-drain output*max6359: push-pull output (v cc 1) *max6360: push-pull output (v cc 2) *max6352: open-drain output*max6353: push-pull output (v cc 1) *max6354: push-pull output (v cc 2) 1 6 v cc 1 5 wdi rst* max6358max6359 max6360 6 sot23 2 3 4 gnd v cc 2 mr 1 5 v cc 1 rst* max6352max6353 max6354 5 sot23 2 3 4 max6351Cmax6360 dual/triple-voltage p supervisory circuits www.maximintegrated.com maxim integrated 9 pin conigurationsselector guide downloaded from: http:///
package type package code outline no. land pattern no. 5 sot23 u5-1 21-0057 90-0174 6 sot23 u6-1 21-0058 90-0175 max6351Cmax6360 dual/triple-voltage p supervisory circuits www.maximintegrated.com maxim integrated 10 chip information process: bicmos 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. downloaded from: http:///
revision number revision date description pages changed 7 5/14 changed the minimum value for the wdi input voltage spec in the electrical characteristics table on page 3; rebranded data sheet 1C11 maxim integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a maxim integrated product. no circuit patent licenses are implied. maxim integrated reserves the right to change the circuitry and speciications without n otice 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. maxim integrated and the maxim integrated logo are trademarks of maxim integrated products, inc. max6351Cmax6360 dual/triple-voltage p supervisory circuits ? 2014 maxim integrated products, inc. 11 revision history for pricing, delivery, and ordering information, please contact maxim direct at 1-888-629-4642, or visit maxim integrateds website at www.maximintegrated.com. downloaded from: http:///

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