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general description the max6467/max6468 microprocessor (p) supervi- sory circuits monitor single power-supply voltages from +1.8v to +5.0v and assert a reset if the supply voltage drops below its preset threshold. an edge-triggered, one-shot manual reset function ensures that the ? enters the reset mode for a fixed timeout period only, even in the event of a continuously asserted manual reset. the max6467/max6468 significantly improve system reliability compared to traditional manual reset supervisory circuits. a variety of factory-trimmed threshold options accommo- date different supply voltages and tolerances, eliminating external components. the factory-set thresholds range from +1.575v to +4.625v to monitor +5.0v, +3.3v, +3.0v, +2.5v, and +1.8v supplies with various tolerances. reset timeout periods of 150ms (min) and 1200ms (min) are available to accommodate different ? platforms. a single, active-low reset output asserts when v cc drops below its threshold or if the edge-triggered mr asserts low. reset remains low for the reset timeout period after v cc rises above its threshold and for a fixed, one-shot timeout period after a manual reset input falling edge. reset remains valid as long as v cc remains above +1v. open-drain (max6467) and push-pull (max6468) output options provide additional flexibility in the system design. the max6467/max6468 are offered in the space-saving 4-pin sot143 package and the ultra-small 4-pin sc70 package and are specified over the automotive (-40? to +125?) temperature range. applications cell phones/pdas embedded control systems industrial equipment automotive products portable/battery-powered equipment medical devices dsl modems mp3 players gps systems digital cameras features ? precision factory-set reset threshold voltages for +5.0v, +3.3v, +3.0v, +2.5v, and +1.8v supplies ? edge-triggered manual reset input with one- shot pulsed reset output ? two reset timeout period options (150ms or 1200ms min) ? immune to short voltage transients ? low supply current (3? at v cc = +1.8v) ? reset valid to v cc = +1v ? active-low open-drain and push-pull reset output options ? -40? to +125? operating temperature range ? small 4-pin sc70 and sot143 packages ? no external components required ? pin compatible with max811, max6315, max6384, and max6386 max6467/max6468 microprocessor supervisory reset circuits with edge-triggered, one-shot manual reset ________________________________________________________________ maxim integrated products 1 ordering information 19-2523; rev 1; 11/05 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. typical operating circuit appears at end of data sheet. part temp range pin-package max6467 xs_ _d_-t -40? to +125? 4 sc70-4 max6467us_ _d_-t -40? to +125? 4 sot143-4 max6468 xs_ _d_-t -40? to +125? 4 sc70-4 max6468us_ _d_-t -40? to +125? 4 sot143-4 note: insert reset threshold suffix (see reset threshold table) after xs or us. 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. devices are available in both leaded and lead-free packaging. specify lead-free by replacing ??with ?t?when ordering. pin configurations continued at end of data sheet. 1 2 4 3 v cc gnd sc70 top view max6467xs max6468xs reset mr pin configurations
max6467/max6468 microprocessor supervisory reset circuits with edge-triggered, one-shot manual reset 2 _______________________________________________________________________________________ absolute maximum ratings electrical characteristics (v cc = +1.2v to +5.5v, t a = -40? to +125?, 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. v cc to gnd ...........................................................-0.3v to +6.0v reset to gnd open-drain........................................................-0.3v to +6.0v push-pull.................................................-0.3v to (v cc + 0.3v) mr to gnd .................................................-0.3v to (v cc + 0.3v) input/output current (all pins) ............................................20ma continuous power dissipation (t a = +70?) 4-pin sc70 (derate 3.1mw/? above +70?) ..............245mw 4-pin sot143 (derate 4mw/? above +70?).............320mw operating temperature range .........................-40? to +125? storage temperature range .............................-65? to +150? junction temperature ......................................................+150? lead temperature (soldering, 10s) .................................+300? parameter sym b o l conditions min typ max units t a = 0? to +125? 1.0 5.5 operating voltage range v cc t a = -40? to 0? 1.2 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 8 supply current i cc v cc = +1.8v, no load 3 7.5 ? t a = +25? -1.5% v th +1.5% t a = -40? to +85? -2.5% +2.5% v cc reset threshold (see the reset threshold table) v th t a = +85? to +125? -3% +3% v v cc reset delay t rd v cc falling at 10mv/? from v th + 100mv to v th - 100mv 35 ? d3 option 150 225 300 v cc reset timeout period t rp d7 option 1200 1800 2400 ms mr timeout period t mrp d3 and d7 options 150 225 300 ms mr rising debounce period (note 2) t deb d3 and d7 options 150 225 300 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 mr minimum input pulse 1s mr glitch rejection 100 ns mr to reset delay 200 ns mr pullup resistance mr to v cc 750 1500 2250 ? v cc +2.5v, i source = 500?, reset not asserted 0.8 x v cc reset output high (max6468 only) v oh v cc +4.5v, i source = 800?, reset not asserted 0.8 x v cc v
max6467/max6468 microprocessor supervisory reset circuits with edge-triggered, one-shot manual reset _______________________________________________________________________________________ 3 electrical characteristics (continued) (v cc = +1.2v to +5.5v, t a = -40? to +125?, unless otherwise noted. typical values are at t a = +25?.) (note 1) parameter sym b o l conditions min typ max units v cc +1v, i sink = 80?, reset asserted 0.3 v cc +2.5v, i sink = 1.2ma, reset asserted 0.3 reset output low v ol v cc +4.5v, i sink = 3.2ma, reset asserted 0.3 v reset output leakage current (max6467 only) i lkg reset not asserted 1 ? note 1: specifications over temperature are guaranteed by design. production testing at t a = +25? only. note 2: the mr input ignores falling edges that occur within the mr rising debounce period (t deb ) after mr first rises from low to high (after a valid mr reset assertion). this prevents invalid reset assertion due to switch bounce. t ypical operating characteristics (v cc = +5v, max6468us29d3 device, t a = +25?, unless otherwise noted.) supply current vs. temperature max6467 toc01 temperature ( c) supply current ( a) 110 95 65 80 -10 5 20 35 50 -25 1 2 3 4 5 6 7 8 9 10 0 -40 125 v cc = +5.5v v cc = +3.6v v cc = +1.8v v cc = +2.5v supply current vs. supply voltage max6467 toc02 supply voltage (v) supply current ( a) 5.0 4.5 3.5 4.0 1.0 1.5 2.0 2.5 3.0 0.5 1 2 3 4 5 6 7 8 9 10 0 0 5.5 v cc to reset delay vs. temperature max6467 toc03 temperature ( c) v cc to reset delay ( s) 110 95 80 65 50 35 20 5 -10 -25 18 20 22 24 26 16 -40 125 v cc = v th + 100mv to v th - 100mv reset timeout period vs. temperature max6467 toc04 temperature ( c) reset timeout period (ms) 110 95 65 80 -10 5 20 35 50 -25 201 202 203 204 205 206 207 208 209 210 200 -40 125 normalized reset threshold vs. temperature max6467 toc05 temperature ( c) normalized reset threshold (v) 110 95 80 65 50 35 20 5 -10 -25 0.995 1.000 1.005 1.010 0.990 -40 125 output voltage low vs. sink current max6467 toc06 i sink (ma) v ol (mv) 9 8 6 7 2 3 4 5 1 50 100 150 200 250 300 350 400 450 500 550 600 0 010 v cc = 5.0v
max6467/max6468 microprocessor supervisory reset circuits with edge-triggered, one-shot manual reset 4 _______________________________________________________________________________________ output voltage high vs. source current max6467 toc07 i source (ma) v oh (v) 7 6 4 5 2 3 1 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 0 08 v cc = +5.0v maximum transient duration vs. reset threshold overdrive max6467 toc08 reset threshold overdrive (mv) maximum transient duration ( s) 50 40 30 20 10 100 200 300 400 500 600 0 060 reset asserts above this line max6467 toc09 temperature ( c) 110 95 65 80 -10 5 20 35 50 -25 65 70 75 80 85 90 95 100 105 110 115 120 60 -40 125 mr to reset delay vs. temperature mr to reset delay (ns) propagation delay (with 100mv overdrive) max6467 toc10 4 s/div 3.0v 3v 0 2.8v v cc 100mv/div ac-coupled reset 1v/div reset pullup and pulldown response max6467 toc11 40 s/div 1.675v 1.6v 0 1.475v v cc 200mv/div reset 500mv/div c reset = 47pf, r pullup = 100k ? , v pullup = 1.6v max6467_s16d3-t reset timeout period max6467 toc12 40ms/div 3.3v 3.3v 0 0 v cc 2v/div reset 2v/div t ypical operating characteristics (continued) (v cc = +5v, max6468us29d3 device, t a = +25?, unless otherwise noted.)
detailed description reset output the max6467 provides an active-low open-drain reset output. the max6468 provides an active-low push-pull reset output. reset asserts low if v cc drops below the selected threshold or if a falling edge occurs on mr . reset remains low for the v cc reset timeout period after v cc increases above the threshold voltage or is one-shot pulsed low for the mr timeout period after a falling edge on mr . manual reset input many ?-based products require manual reset capability, allowing the operator, a test technician, or external logic circuitry to initiate a reset. a falling edge on mr asserts reset low. reset is one-shot pulsed low for the mr timeout period after a falling edge on mr . an internal 1.5k ? pullup resistor to v cc allows mr to be left uncon- nected if not used. mr can be driven with ttl or cmos- logic levels, or with open-drain/collector outputs. connect a normally open momentary pushbutton switch from mr to gnd to realize a manual reset function. external debounce circuitry is not required, as the max6467/ max6468 respond to the first falling edge on mr and ignore subsequent falling edges within the reset timeout period and during the mr debounce period (see figure 1). after mr goes high for 150ms (t deb ), the manual reset one-shot is ready to trigger a reset on the next mr falling edge. connect a 0.1? capacitor from mr to gnd when using long cables to provide additional noise immunity (figure 2). max6467/max6468 microprocessor supervisory reset circuits with edge-triggered, one-shot manual reset _______________________________________________________________________________________ 5 pin description pin name function 1 gnd ground 2 reset reset output. reset is an active-low open-drain (max6467) or push-pull (max6468) output. reset asserts low when v cc drops below the selected threshold and remains low for the v cc reset timeout period after v cc rises above the threshold. the reset one-shot asserts low for a fixed mr reset timeout period on the falling edge of the manual reset input. the open-drain output requires an external pullup resistor. 3 mr manual reset input. drive mr low to initiate a reset output. mr controls an edge-triggered one-shot that asserts reset low for a fixed mr timeout period when mr is driven low. internal timing circuitry ignores switch close and open bounce to ensure proper one-shot reset timing. 4v cc power-supply input. v cc provides power to the device and is also a monitored voltage. when v cc drops below the selected threshold, reset asserts low and remains low for the reset timeout period after v cc rises above the threshold. for better noise immunity, bypass v cc to gnd with a 0.1? capacitor. v cc gnd gnd mr t rp gnd reset v th switch bounce switch bounce switch bounce t mrp t mrp t deb figure 1. timing diagram
max6467/max6468 applications information falling v cc transients in addition to issuing a reset to the ? during power-up, power-down, and brownout conditions, the max6467/ max6468 are relatively immune to short-duration falling v cc transients (glitches). the typical operating characteristics section shows the maximum transient duration vs. v cc overdrive for which the max6467/ max6468 do not generate a reset pulse. this graph was generated using a falling pulse applied to v cc starting above the actual reset threshold and ending below the threshold by the magnitude indicated (v cc overdrive). the graph indicates the typical maximum pulse width a falling v cc transient can have without initiating a reset pulse. as the magnitude of the transient increases (goes farther below the reset threshold), the maximum allowable pulse width decreases. a 0.1f bypass capacitor from v cc to gnd provides additional transient immunity. ensuring a valid reset output down to v cc = 0v the max6467/max6468 guarantee proper operation down to v cc = +1v. in applications that require valid reset levels down to v cc = 0v, a pulldown resistor to active-low outputs (max6468 only, figure 3) ensures that reset remains valid while the reset output can no longer sink current. this scheme does not work with the open-drain outputs of the max6467. ensure that the resistor value used does not overload the reset output when v cc is above the reset threshold. for most appli- cations, use 100k ? to 1m ? . microprocessor supervisory reset circuits with edge-triggered, one-shot manual reset 6 _______________________________________________________________________________________ reset timeout suffix v cc reset timeout period (m in/max) (ms) mr timeout period (min/max) (ms) mr rising debounce period (m in/max) (ms) d3 150/300 150/300 150/300 d7 1200/2400 150/300 150/300 reset timeout delay* * additional reset timeout options may be available. contact factory for availability. max6468 v cc gnd reset r1 100k ? figure 3. reset valid to v cc = 0v chip information transistor count: 748 process: bicmos 1.5k ? v cc mr one-shot/ debounce reset timeout period reset output v cc 1.23v v cc mr reset gnd max6467 max6468 figure 2. functional diagram
max6467/max6468 microprocessor supervisory reset circuits with edge-triggered, one-shot manual reset _______________________________________________________________________________________ 7 part top mark max6467 xs16d3 agl max6467xs22d3 agm max6467xs26d3 agn max6467xs29d3 ago max6467xs46d3 agp max6467us16d3 kafn max6467us22d3 kafo max6467us26d3 kafp max6467us29d3 kafq max6467us46d3 kafr max6468 xs16d3 agq max6468xs22d3 agr max6468xs26d3 ags max6468xs29d3 agc max6468xs46d3 agb max6468us16d3 kafs max6468us22d3 kaft max6468us26d3 kafu max6468us29d3 kaew max6468us46d3 kafv max6467 max6468 +1.0v to +5.5v v cc gnd v cc gnd mr reset reset input p t ypical operating circuit suffix v th (min) v th (typ) v th (max) 46 4.509 4.625 4.741 45 4.388 4.500 4.613 44 4.266 4.375 4.484 43 4.193 4.300 4.408 42 4.095 4.200 4.305 41 3.998 4.100 4.203 40 3.900 4.000 4.100 39 3.803 3.900 3.998 38 3.705 3.800 3.895 37 3.608 3.700 3.793 36 3.510 3.600 3.690 35 3.413 3.500 3.588 34 3.315 3.400 3.485 33 3.218 3.300 3.383 32 3.120 3.200 3.280 31 2.998 3.075 3.152 30 2.925 3.000 3.075 29 2.852 2.925 2.998 28 2.730 2.800 2.870 27 2.633 2.700 2.768 26 2.559 2.625 2.691 25 2.438 2.500 2.563 24 2.340 2.400 2.460 23 2.255 2.313 2.370 22 2.133 2.188 2.242 21 2.048 2.100 2.153 20 1.950 2.000 2.050 19 1.853 1.900 1.948 18 1.755 1.800 1.845 17 1.623 1.665 1.707 16 1.536 1.575 1.614 reset threshold (-40 c to +85 c) 4 3 1 2 v cc gnd sot143 top view max6467us max6468us reset mr pin configurations (continued) standard versions
max6467/max6468 microprocessor supervisory reset circuits with edge-triggered, one-shot manual reset 8 _______________________________________________________________________________________ sot-143 4l.eps e 1 1 21-0052 package outline, sot-143, 4l 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 .)
max6467/max6468 microprocessor supervisory reset circuits with edge-triggered, one-shot manual reset 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 _____________________ 9 2005 maxim integrated products printed usa is a registered trademark of maxim integrated products, inc. 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 .) sc70, 4l.eps package outline, 4l sc70 21-0098 1 1 c
quickview - max6467, max6468 microprocessor supervisory reset circuits with edge-triggered, one-shot manual reset english ? ???? ? ??? ? ??? login | register enter keywords or part number what's new products solutions design appnotes support sales about us my maxim maxim > products > [supervisors, voltage monitors, sequencers] [automotive] max6467, max6468 microprocessor supervisory reset circuits with edge-triggered, one-shot manual reset quickview technical documents ordering info more information user comments (0) all status active: in production. description full data sheet (pdf, 324kb) download e-mail the max6467/max6468 microprocessor (p) supervisory circuits monitor single power-supply voltages from +1.8v to +5.0v and assert a reset if the supply voltage drops below its preset threshold. an edge-triggered, one- shot manual reset function ensures that the p enters the reset mode for a fixed timeout period only, even in the event of a continuously asserted manual reset. the max6467/max6468 significantly improve system reliability compared to traditional manual reset supervisory circuits. a variety of factory-trimmed threshold options accommodate different supply voltages and tolerances, eliminating external components. the factory-set thresholds range from +1.575v to +4.625v to monitor +5.0v, +3.3v, +3.0v, +2.5v, and +1.8v supplies with various tolerances. reset timeout periods of 150ms (min) and 1200ms (min) are available to accommodate different p platforms. a single, active-low reset output asserts when v cc drops below its threshold or if the edge-triggered active-low mr asserts low. active-low reset remains low for the reset timeout period after v cc rises above its threshold and for a fixed, one-shot timeout period after a manual reset input falling edge. active-low reset remains valid as long as v cc remains above +1v. open-drain (max6467) and push-pull (max6468) output options provide additional flexibility in the system design. the max6467/max6468 are offered in the space-saving 4-pin sot143 package and the ultra-small 4-pin sc70 package and are specified over the automotive (-40c to +125c) temperature range. key features applications/uses l precision factory-set reset threshold voltages for +5.0v, +3.3v, +3.0v, +2.5v, and +1.8v supplies l edge-triggered manual reset input with one-shot pulsed reset output l two reset timeout period options (150ms or 1200ms min) l immune to short voltage transients l low supply current (3a at v cc = +1.8v) l active-low reset valid to v cc = +1v l active-low open-drain and push-pull active-low reset output options l -40c to +125c operating temperature range l small 4-pin sc70 and sot143 packages l no external components required l pin compatible with max811, max6315, max6384, and max6386 l automotive electronics l cell phones/pdas l digital still cameras l dsl modems l embedded control systems l global positioning systems (gps) l industrial equipment l medical devices l mp3 players l portable battery-powered equipment http://www.maxim-ic.com/quick_view2.cfm/qv_pk/3521/t/ (1 of 3) [01-feb-2010 8:15:31 am]
quickview - max6467, max6468 microprocessor supervisory reset circuits with edge-triggered, one-shot manual reset key specifications: pushbutton devices part number monitored voltages manual reset feature mr1 setup time reset thresh. (v) reset out t reset reset thresh. accur. (%) i cc (a) package/pins price min @ +25c max see notes max6467 1 one-shot 1s 1.2 to 1.79 1.8 to 2.49 2.5 to 3.29 3.3 to 4.99 active low open drain 85ms to 300ms >1s 1.5 13 sc70/4 sot/4 $0.96 @1k max6468 active low push- pull sc70/4 sot/4 $0.96 @1k see all pushbutton devices (17) key specifications: switch debouncer/protectors part number switch inputs edge triggered functions debounce duration (ms) output polarity output type switch inputs (v) esd protect. (kv) i cc (a) package/pins price max max see notes max6467 1 falling edge non- retriggerable one-shot 85 to 300 active low open- drain +5.5 2 13 sc70/4 sot/4 $0.96 @1k max6468 push- pull sc70/4 sot/4 $0.96 @1k see all switch debouncer/protectors (6) diagram typical operating circuit didn't find what you need? http://www.maxim-ic.com/quick_view2.cfm/qv_pk/3521/t/ (2 of 3) [01-feb-2010 8:15:31 am]
quickview - max6467, max6468 microprocessor supervisory reset circuits with edge-triggered, one-shot manual reset l next day product selection assistance from applications engineers l parametric search l applications help quickview technical documents ordering info more information description key features applications/uses key specifications diagram data sheet application notes design guides engineering journals reliability reports software/models evaluation kits price and availability samples buy online package information lead-free information related products notes and comments evaluation kits document ref.: 19-2523; rev 1; 2006-05-26 this page last modified: 2009-10-14 contact us ? rate this page ? mail this page ? privacy policy ? legal notices copyright ? 2010 by maxim integrated products http://www.maxim-ic.com/quick_view2.cfm/qv_pk/3521/t/ (3 of 3) [01-feb-2010 8:15:31 am]

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