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general description the max6806/max6807/max6808 precision voltage detectors are ideal for accurate monitoring of power supplies in digital systems. they provide circuit reliabili- ty and reduce total cost by eliminating external compo- nents and adjustments. the max6806/max6807/max6808 assert a reset signal whenever the supply voltage (v cc ) falls below the factory- preset, ?% accurate threshold. internal hysteresis ensures stable switching. the max6806/max6807/ max6808 are available in 4.6v and 2.6v thresholds (2.3v is also available for the max6806 only). the max6806 fea- tures an active-low, push-pull reset output; the max6807 features an active-high, push-pull reset output; and the max6808 features an active-low, open-drain reset out- put. reset is valid for v cc down to 1v (max6806/ max6808), and reset (max6807) is guaranteed for v cc down to 1.2v. the max6806/max6807/max6808 are available in 3-pin sc70, 3-pin sot23, 8-pin ?ax, 8-pin so, and 4- pin sot143 packages. the sot143 package includes a manual-reset input. applications computers automotive controllers bar-code scanners intelligent instruments critical ? and ? power monitoring portable/battery-powered equipment features preset reset thresholds: 4.6v and 2.6v (2.3v also available for max6806 only) 2% accurate reset thresholds reset output available in active-low (max6806), active-high (max6807), and open-drain (max6808) versions immune to power-supply transients reset valid to v cc = 1.0v (max6806/max6808) 35a supply current no external components manual reset available with 4-pin sot143 package miniature 3-pin sc70, 3-pin sot23, and 4-pin sot143 packages 8 lead max and 8 lead so packages are pin compatible with the mc33064/mc33164/ mc34064/mc34164 max6806/max6807/max6808 voltage detectors ________________________________________________________________ maxim integrated products 1 19-1421; rev 2; 4/01 ordering information selector guide and pin configurations appear at end of data sheet. * sot23, sot143, and sc70s are available in tape-and-reel only, 2500 piece minimum order quantity. note: insert the desired number from the selector guide into the blank to complete the part number. also see selector guide for top mark for sot23 part temp. range pin-package max6806 xr_ _ -t -40? to +85? 3 sc70 max6806ur_ _ -t -40? to +85? 3 sot23 max6806us_ _ -t -40? to +85? 4 sot143 max6806ua_ _ -40? to +85? 8 ?ax max6806sa_ _ -40? to +85? 8 so max6807 xr_ _ -t -40? to +85? 3 sc70 max6807ur_ _ -t -40? to +85? 3 sot23 max6807us_ _ -t -40? to +85? 4 sot143 max6807ua_ _ -40? to +85? 8 ?ax max6807sa_ _ -40? to +85? 8 so max6808 xr_ _ -t -40? to +85? 3 sc70 max6808ur_ _ -t -40? to +85? 3 sot23 max6808us_ _ -t -40? to +85? 4 sot143 max6808ua_ _ -40? to +85? 8 ?ax max6808sa_ _ -40? to +85? 8 so 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 max6806 max6807 max6808 v cc v cc v cc gnd gnd p (reset)/reset reset input ( ) are for max6807
max6806/max6807/max6808 voltage detectors 2 _______________________________________________________________________________________ absolute maximum ratings electrical characteristics (v cc = +5v, t a = -40? to +85?, 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. note1: all devices are 100% production tested at t a = +25?, and are guaranteed by design for t a = t min to t max , as specified. note 2: reset output for max6806/max6808, reset output for max6807. v cc to gnd ..........................................................-0.3v to +6.0v reset, reset to gnd (max6806/max6807) ................................-0.3v to (v cc + 0.3v) reset to gnd (max6808)...................................-0.3v to + 6.0v mr to gnd (sot143 package only) ....................-0.3v to + 6.0v input current, v cc ...........................................................?0ma output current, reset, reset .......................................?0ma rate of rise, v cc ...........................................................100v/? continuous power dissipation (t a = +70?) sot23, sot143 (derate 4mw/? above +70?) .........320mw sc70 (derate 2.17mw/? above +70?) .....................174mw ?ax (derate 4.5mw/? above +70?) ......................362mw so (derate 5.9mw/? above +70?) ...........................471mw operating temperature range ..........................-40? to +85? storage temperature range .............................-65? to +160? lead temperature (soldering, 10s) .................................+300? v cc = +3.6v, no load v cc > v th+ t a = -40? to +85? t a = 0? to +70? v cc falling at 1mv/? i sink = 1.0ma, v cc = 2.0v i sink = 3.2ma, v cc = 5.0v i source = 400?, v cc = 2.0v i sink = 20?, v cc = 1.0v t a = +25?, v cc falling v cc = +5.5v, no load i source = 20?, v cc = 1.2v conditions v 0.7v cc v ih mr input threshold 0.6 v il k ? 40 80 120 r mr mr pull-down resistance ppm/? 30 reset threshold tempco ? 30 v cc to reset delay (note 2) 0.4 v ol reset output voltage (max6807) v 0.8v cc v oh 0.8v cc 35 60 v 1.2 5.5 v cc 1.0 5.5 supply voltage range v ol 0.4 0.3 2.254 2.30 2.346 v th- reset threshold ? 50 80 i cc supply current 4.508 4.60 4.692 3.136 3.20 3.264 v 2.548 2.60 2.652 units min typ max symbol parameter max680_ _ _46 max680_ _ _32 max680_ _ _26 v oh i source = 2.0ma, v cc = 5.0v (max6806 only) reset output voltage (max6806/max6808) v 0.8v cc v cc = 5.5v, reset deasserted (max6808 only) ? 1 i oh reset output leakage current t a = +25?, figure 2 v 0.02 0.03 v th- v th- v hyst reset threshold hysteresis max680_ _ _23
max6806/max6807/max6808 voltage detectors _______________________________________________________________________________________ 3 typical operating characteristics (t a = +25?, unless otherwise noted.) 0 10 5 20 15 30 25 35 45 40 50 -60 -30 0 30 60 120 90 supply current vs. temperature max6806/7/8-01 temperature (?) supply current ( a) v cc = 5.0v v cc = 3.3v v cc = 1.8v v cc = 1.0v 25 29 27 33 31 35 37 43 41 39 45 -60 -30-15 0 -45 15 30 45 75 60 90 105 120135 power-down reset delay vs. temperature max6806/7/8toc02 temperature ( c) reset delay ( s) v od = v th- - v cc = 100mv v cc falling at 1mv/ s 4 6 5 7 9 8 11 10 12 -60 -30 0 30 60 120 90 power-up reset delay vs. temperature max6806/7/8-03 temperature ( c) delay time ( s) v od = v cc - v th + v od = 50mv v od = 200mv v od = 100mv 0.9900 0.9940 0.9920 0.9980 0.9960 1.0020 1.0000 1.0040 1.0080 1.0060 1.0100 -40 -15 0 -30 15 30 60 45 85 75 normalized reset threshold vs. temperature max6806/7/8-04 temperature ( c) normalized reset threshold v cc rising (v th+ ) v cc falling (v th- ) 1 active-low reset output (max6806/max6808). reset remains low while v cc is below the reset-threshold voltage or while mr is held high. active-high reset output (max6807). reset remains high while v cc is below the reset-threshold voltage or while mr is held high. 2 ground 3 supply voltage input active-high manual reset input. internal 80k ? resistor to gnd. sot23/sc70 function pin description reset reset gnd v cc mr name 1 4 3 2 sot143 pin n.c. not internally connected 3, 5? 1 4 2 max/so
max6806/max6807/max6808 voltage detectors 4 _______________________________________________________________________________________ _______________detailed description reset output the max6806 voltage detector features an active-low, push-pull reset output, while the max6807 features an active-high, push-pull reset output. unlike micro- processor (?) supervisory circuits that offer a reset timeout period, the max6806 and max6807 reset goes high and reset goes low virtually immediately once v cc exceeds the reset threshold. if a brownout occurs (v cc falls below the reset threshold), reset goes low and reset goes high. reset is guaranteed to be a logic low for v cc 1v and reset is guaran- teed to be a logic high for v cc 1.2v. the max6808 features an active-low, open-drain reset output. the output sinks current when v cc falls below the reset threshold. connect a pull-up resistor from reset to any supply voltage up to 6v (figure 1). select a resistor value large enough to provide a logic low and small enough to provide a logic high while supplying all input and leakage currents connected to the reset line. a 100k ? resistor is sufficient in applications driving high-impedance loads. the manual reset input (mr, 4-pin sot143 package) can also initiate a reset (see manual reset input sec- tion). manual reset input many applications require manual-reset capabilities, allowing an operator, a test technician, or external logic circuitry to initiate a reset. a logic high on mr asserts a reset and remains asserted while mr is high. this input has an 80k ? pull-down resistor, so the input may be left unconnected if not used. connect a normally open momentary switch from mr to v cc to create a manual- reset function. 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 noise immunity. hysteresis the max6806/max6807/max6808 feature internal hys- teresis that creates two trip points: one for the rising supply voltage and one for the falling supply voltage (figure 2). the hysteresis prevents the output from oscil- lating (chattering) when v cc is near the reset threshold. reset threshold accuracy the max6806/max6807/max6808 are ideal for sys- tems using a 5v ?%, 3v ?%, or 2.5v ?% power supply with ics specified for 5v ?0%, 3v ?0%, or 2.5v ?0%, respectively. the reset is guaranteed to assert after the power supply falls out of regulation, but before power drops below the minimum specified oper- ating voltage range for the system ics. max6808 v cc v cc gnd +3.3v gnd +5.0v 100k ? 5v system reset figure 1. the max6808 open-drain reset output allows use with multiple supplies. v th+ hyst reset (max6806/max6808) reset (max6807) v hyst = v th+ - v th- v oh v ol v oh v ol v th- figure 2. input and output waveforms with v cc varied
applications information negative-going v cc transients in addition to asserting a reset signal during power-up, power-down, and brown-out conditions, the max6806/ max6807/max6808 are immune to short-duration, neg- ative-going v cc transients. figure 3 displays typical transient durations vs. reset- comparator overdrive for which the max6806/max6807/ max6808 do not generate a reset pulse. the graph was generated using a negative-going pulse applied to v cc , starting 0.5v above the actual reset threshold and end- ing below it by the magnitude indicated (reset-compara- tor 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 transient increases (goes further below the reset threshold), the maximum allowable pulse width decreases. a 0.1? capacitor mounted as close as possible to v cc pro- vides additional transient immunity. ensuring a valid reset output down to v cc = ground when v cc falls below 1v, the max6806/max6808 reset output no longer sinks current?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 applica- tions, since most circuitry is inoperative when v cc is below 1v. in applications where reset must be valid down to ground, add a pull-down resistor to reset so any stray leakage currents flow to ground, holding reset low (figure 4). select r1 to be large enough not to load reset and small enough to pull reset to ground. for most applications, 100k ? will not load reset and will pull reset to ground. similarly, if reset (max6807) must be valid below 1.2v, add a pull-up resistor to reset. max6806/max6807/max6808 voltage detectors _______________________________________________________________________________________ 5 80 70 20 10 100 1000 40 30 50 60 reset comparator overdrive, v th- - v cc (mv) maximum transient duration ( s) t a = +25 c max680 46 figure 3. maximum transient duration without causing a reset pulse vs. reset comparator overdrive max6806 max6807 v cc v cc gnd gnd reset reset r1 100k ? r1 100k ? figure 4. reset / reset valid to v cc = ground circuit
max6806/max6807/max6808 interfacing to ps with bidirectional reset pins ?s with bidirectional reset pins (such as the motorola 68hc11 series) can contend with push-pull reset out- puts, resulting in indeterminate logic levels. use the max6808 with the open-drain reset when interfacing to this type of controller. voltage detectors 6 _______________________________________________________________________________________ max6808 v cc v cc v cc gnd gnd 4.7k ? p reset reset figure 5. interfacing to ?s with bidirectional reset i/o selector guide part reset output top mark code nominal v th (v) max6806sa46 4.6 max6806sa26 2.6 max6806sa23 2.3 max6806ua46 4.6 max6806ua26 2.6 max6806ua23 2.3 max6806ur46-t fzdp 4.6 max6806ur26-t fzdq 2.6 max6806ur23-t fzdr 2.3 max6806us46-t kabt 4.6 max6806us26-t kabu 2.6 max6806us23-t kabv 2.3 max6806xr46-t aaa 4.6 max6806xr26-t aab 2.6 max6806xr23-t active-low, push-pull aac 2.3
max6806/max6807/max6808 voltage detectors _______________________________________________________________________________________ 7 other voltage thresholds may be available. contact factory for availability. selector guide (continued) part reset output top mark code nominal v th (v) max6807sa46 4.6 max6807sa26 2.6 max6807ua46 4.6 max6807ua26 2.6 max6807ur46-t fzds 4.6 max6807ur26-t fzdt 2.6 max6807us46-t kabw 4.6 max6807us26-t kabx 2.6 max6807xr46-t aad 4.6 max6807xr26-t active-high, push-pull aae 2.6 max6808sa46 4.6 max6808sa32 3.2 max6808sa26 2.6 max6808ua46 4.6 max6808ua32 3.2 max6808ua26 2.6 max6808ur46-t fzdu 4.6 max6808ur32-t fzfl 3.2 max6808ur26-t fzdv 2.6 max6808us46-t kaby 4.6 max6808us32-t kacc 3.2 max6808us26-t kabz 2.6 max6808xr46-t aaf 4.6 max6808xr32-t acd 3.2 max6808xr26-t active-low, open-drain aag 2.6
max6806/max6807/max6808 voltage detectors 8 _______________________________________________________________________________________ ___________________chip information transistor count: 72 pin configurations top view gnd 1 3 v cc (reset)/reset max6806 max6807 max6808 sot23/sc70 2 ( ) are for max6807 1 2 4 3 gnd v cc mr (reset)/reset max6806 max6807 max6808 sot143 max6806 max6807 max6808 max/so 8 n.c. 5 n.c. 4 gnd 1 (reset)/reset 2 v cc 3 n.c. 6 n.c. 7 n.c.
max6806/max6807/max6808 voltage detectors _______________________________________________________________________________________ 9 package information sc70, 3l.eps
max6806/max6807/max6808 voltage detectors 10 ______________________________________________________________________________________ package information (continued) sotpo3l.eps
max6806/max6807/max6808 voltage detectors ______________________________________________________________________________________ 11 package information (continued) sot1434.eps
max6806/max6807/max6808 voltage detectors 12 ______________________________________________________________________________________ package information (continued) 8lumaxd.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. maxim integrated products, 120 san gabriel drive, sunnyvale, ca 94086 408-737-7600 _____________________ 13 ? 2001 maxim integrated products printed usa is a registered trademark of maxim integrated products. package information (continued) max6806/max6807/max6808 voltage detectors soicn.eps

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