general description the max6800/max6801/max6802 microprocessor (?) supervisory circuits monitor the power supplies in 2.85v to 5.0v ? and digital systems. they increase circuit reliability and reduce cost by eliminating external com- ponents and adjustments. these devices perform a single function?hey assert a reset signal whenever the v cc supply voltage declines below a preset threshold, keeping it asserted for a preset timeout period after v cc has risen above the reset threshold. the only difference among the three devices is their output. the max6801 (push/pull) and max6802 (open-drain) have an active-low reset output, while the max6800 (push/pull) has an active-high reset output. the max6800/max6801 are guaranteed to be in the cor- rect state for v cc down to 0.7v. the max6802 is guaran- teed to be in the correct state for v cc down to 1.0v. the reset comparator in these ics is designed to ignore fast transients on v cc . reset thresholds are factory- trimmable between 2.63v and 4.80v, in approximately 100mv increments. these devices are available with a 1ms (min), 20ms (min), or 100ms (min) reset pulse width. ideal for space-critical applications, the max6800/max6801/max6802 come packaged in a 3- pin sot23. for a lower threshold voltage version, see the max6332/max6333/max6334. applications computers controllers intelligent instruments critical ?/? power monitoring portable/battery-powered equipment automotive features ultra-low 0.7v operating supply voltage low 4.0 a supply current precision monitoring of 2.85v to 5.0v power- supply voltages reset thresholds available from 2.63v to 4.80v, in approximately 100mv increments fully specified over temperature three power-on reset timeout periods available (1ms min, 20ms min, 100ms min) low cost three available output structures: push/pull reset, push/pull reset , open-drain reset guaranteed reset/ reset valid to v cc = 0.7v (max6800/max6801) power-supply transient immunity no external components required 3-pin sot23 package pin compatible with max809/max810, max6326/max6327/max6328, and max6346/max6347/max6348 max6800/max6801/max6802 3-pin, low-power p reset circuits ________________________________________________________________ maxim integrated products 1 ordering information * these devices are available in factory-set v cc reset thresh- olds from 2.63v to 4.80v, in approximately 0.1v increments. choose the desired reset threshold suffix from table 1 and insert it in the blanks following ?r?in the part number. factory-programmed reset timeout periods are also available. insert the number corresponding to the desired nominal reset timeout period (1 = 1ms min, 2 = 20ms min, 3 = 100ms min) in the blank following ??in the part number. there are 15 stan- dard versions with a required order increment of 2500 pieces. sample stock is generally held on the standard versions only (see selector guide). contact the factory for availability of non- standard versions (required order increment is 10,000 pieces). all devices 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. typical operating circuit and pin configuration appear at end of data sheet. selector guide appears at end of data sheet. 19-1933; rev 4; 3/12 for pricing, delivery, and ordering information, please contact maxim direct at 1-888-629-4642, or visit maxim? website at www.maxim-ic.com. part temp range pin- pa ck a g e max6800 ur_ _d_-t -40? to +125? 3 sot23 max6800ur_ _d_/v-t -40? to +125? 3 sot23 max6801 ur_ _d_-t -40? to +125? 3 sot23 max6801ur_ _ d_/v-t -40? to +125? 3 sot23 max6802 ur_ _d_-t -40? to +125? 3 sot23 max6802ur_ _ d_/v-t -40? to +125? 3 sot23
max6800/max6801/max6802 3-pin, low-power p reset circuits 2 _______________________________________________________________________________________ absolute maximum ratings electrical characteristics ( v cc = full range, t a = -40? to +125?, unless otherwise noted. typical values are at v cc = +5.0v and t a = +25?, reset not asserted.) (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. terminal voltage (with respect to gnd) v cc ......................................................................-0.3v to +6v push/pull reset, reset .......................-0.3v to (v cc + 0.3v) open-drain reset ..............................................-0.3v to +6v input current (v cc ) .............................................................20ma output current (reset, reset ).........................................20ma continuous power dissipation (t a = +70?) 3-pin sot23 (derate 4mw/? above +70?) ..............320mw operating temperature range .........................-40? to +125? junction temperature ......................................................+150? storage temperature range .............................-65? to +150? lead temperature (soldering, 10s) .................................+300? soldering temperature (reflow) .......................................+300? lead (pb)-free packages ............................................+260? package containing lead (pb).....................................+240? parameter symbol conditions min typ max units max6800/max6801 0.7 5.5 t a = 0 c to +125 c max6802 1.0 5.5 max6800/max6801 0.78 5.5 supply voltage range (note 2) v cc t a = -40 c to +125 c max6802 1.2 5.5 v v cc = +3.0v 4 10 supply current i cc no load v cc = +5.0v 5 12 ? t a = +25 c v th - 1.8% v th v th + 1.8% reset threshold v th max680_ur_ _d_-t, table 1 t a = - 40 c to + 125 c v th - 3% v th v th + 3% v v cc falling reset delay v cc falling at 10v/ms 30 ? max680_ur_ _d1-t 1 1.5 2 max680_ur_ _d2-t 20 30 40 reset active timeout period t rp max680_ur_ _d3-t 100 150 200 ms i sink = 50?, v cc 1.0v 0.4 i sink = 1.2ma, v cc 2.5v 0.3 reset output low voltage (max6801/max6802) v ol reset asserted i sink = 1.2ma, v cc 4.25v 0.4 v i s ou rc e = 500?, v c c 3.0v 0.8 x v c c reset output high voltage (max6801) v oh reset not asserted i s ou rc e = 800?, v c c 5.0v 0.8 x v c c v i sourc e = 1 a, v cc 1.0v 0.8 x v c c i sourc e = 200?, v cc 1.8v 0.8 x v c c v oh reset asserted i sourc e = 800?, v cc 4.25v 0.8 x v c c i sink = 1.2ma, v cc 3.0v 0.3 reset output voltage (max6800) v ol reset not asserted i sink = 3.2ma, v cc 5.0v 0.4 v reset output leakage current (max6802) v cc > v th , reset not asserted 0.5 ? note 1: all parts are production tested at t a = +25 c. overtemperature limits are guaranteed by design and not production tested. note 2: i source for the max6800 is i00na. i sink for the max6801 is 100na. i sink for the max6802 is 50?.
3-pin, low-power p reset circuits _______________________________________________________________________________________ 3 3.0 4.0 3.5 5.0 4.5 6.0 5.5 6.5 -50 0 25 -25 50 75 100 125 supply current vs. temperature max6800/01/02 toc01 temperature ( c) i cc ( a) v cc = +5.0v v cc = +3.3v 0.950 0.980 0.970 0.960 1.000 0.990 1.040 1.030 1.020 1.010 1.050 -50 -25 0 25 50 75 100 125 normalized reset timeout period vs. temperature max6800/01/02 toc02 temperature ( c) normalized reset timeout period 0 30 20 10 50 40 90 80 70 60 100 -50 -25 0 25 50 75 100 125 v cc falling propagation delay vs. temperature max6800/01/02 toc06 temperature ( c) propagation delay ( s) v cc = falling at 1v/ms v cc = falling at 10v/ms 100 1000 0 100 200 400 300 500 600 0.1 1 10 maximum transient duration vs. reset comparator overdrive max6800/01/02 toc05 reset comparator overdrive (mv) maximum transient duration ( s) reset occurs reset does not occur 100 75 50 25 0 1.0 2.0 1.5 2.5 3.0 reset (v oh ) vs. supply voltage max6800/01/02 toc04 v cc (v) output voltage high (v cc - v oh ) (mv) t a = +25 c t a = -40 c t a = +125 c t a = +85 c v th = 2.93v i source = 100 a reset asserted (max6800) 80 60 40 20 0 1.0 1.5 2.0 2.5 3.0 reset (v ol ) vs. supply voltage max6800/01/02 toc03 v cc (v) output voltage low (mv) t a = +125 c t a = +85 c t a = +25 c t a = -40 c v th = 2.93v i sink = 500 a reset asserted max6801/max6802 typical operating characteristics (reset not asserted, t a = +25?, unless otherwise noted.) max6800/max6801/max6802 pin description pin name function max6800 max6801/ max6802 1 1 gnd ground 2 reset active-low reset output. reset is asserted while v cc is below the reset threshold and remains asserted for a reset timeout period (t rp ) after v cc rises above the reset threshold. reset on the max6801 is push/pull. reset on the max6802 is open-drain. 2 reset active-high reset output. reset is asserted while v cc is below the reset threshold and remains asserted for a reset timeout period (t rp ) after v cc rises above the reset threshold. reset on the max6800 is push/pull. 3 3 v cc supply voltage input
max6800/max6801/max6802 3-pin, low-power p reset circuits 4 _______________________________________________________________________________________ v cc v cc gnd max6802 reset v cc gnd reset motorola 68hcxx p 100k ? applications information interfacing to ps with bidirectional reset pins since the reset output on the max6802 is open-drain, this device interfaces easily with ?s that have bidirec- tional reset pins, such as the motorola 68hc11. connecting the ? supervisor? reset output directly to the microcontroller? (??) reset pin with a single pullup resistor allows either device to assert reset (figure 1). negative-going v cc transients in addition to issuing a reset to the ? during power-up, power-down, and brownout conditions, these devices are relatively immune to short-duration, negative-going v cc transients (glitches). the typical operating characteristics show the maximum transient duration vs. reset comparator overdrive graph. the graph shows the maxi- mum pulse width that a negative-going v cc transient may typically have without issuing a reset signal. as the ampli- tude of the transient increases, the maximum allowable pulse width decreases. figure 1. interfacing to ?s with bidirectional reset pins top view 1 2 3 v cc reset (reset) max6800 max6801 max6802 sot23-3 ( ) are for max6800 gnd pin configuration figure 2. ensuring reset valid down to v cc = 0v v cc gnd max6801 reset 100k ? (a) v cc gnd max6800 reset 100k ? * (b) *assumes high-z reset input to the p max6801 v cc v cc reset reset gnd v cc gnd p typical operating circuit
3-pin, low-power p reset circuits _______________________________________________________________________________________ 5 max6800/max6801/max6802 table 1. factory-trimmed reset thresholds t a = +25 ct a = -40 c to +125 c reset threshold suffix min typ (v th ) max min max 48 4.714 4.80 4.886 4.656 4.944 47 4.615 4.70 4.785 4.559 4.841 46 4.547 4.63 4.713 4.491 4.769 45 4.419 4.50 4.581 4.365 4.635 44 4.301 4.38 4.459 4.249 4.511 43 4.223 4.30 4.377 4.171 4.429 42 4.124 4.20 4.276 4.074 4.326 41 4.026 4.10 4.174 3.977 4.223 40 3.928 4.00 4.072 3.880 4.120 39 3.830 3.90 3.970 3.783 4.017 38 3.732 3.80 3.868 3.686 3.914 37 3.633 3.70 3.767 3.589 3.811 36 3.535 3.60 3.665 3.492 3.708 35 3.437 3.50 3.563 3.395 3.605 34 3.339 3.40 3.461 3.298 3.502 33 3.241 3.30 3.359 3.201 3.399 32 3.142 3.20 3.258 3.104 3.296 31 3.025 3.08 3.135 2.988 3.172 30 2.946 3.00 3.054 2.910 3.090 29 2.877 2.93 2.983 2.842 3.018 28 2.750 2.80 2.850 2.716 2.884 27 2.651 2.70 2.749 2.619 2.781 26 2.583 2.63 2.677 2.551 2.709 ensuring a valid reset output down to v cc = 0v when v cc falls below 1v and approaches the minimum operating voltage of 0.7v, push/pull-structured reset sinking (or sourcing) capabilities decrease drastically. high-impedance cmos-logic inputs connected to the reset pin can drift to indeterminate voltages. this does not present a problem in most cases, since most ?s and circuitry do not operate when v cc drops below 1v. for the max6801 application, where reset must be valid down to 0v, adding a pulldown resistor between reset and gnd removes stray leakage cur- rents, holding reset low (figure 2a). the pulldown resistor value is not critical; 100k ? is large enough not to load reset and small enough to pull it low. for the max6800 application, where reset must be valid to v cc = 0v, a 100k ? pullup resistor between reset and v cc will hold reset high when v cc falls below 0.7v (figure 2b). since the max6802 has an open-drain, active-low out- put, it typically uses a pullup resistor. with this device, reset will most likely not maintain an active condition, but will drift to a non-active level due to the pullup resistor and the reduced sinking capability of the open- drain device. therefore, this device is not recommend- ed for applications where the reset pin is required to be valid down to v cc = 0v.
process: bicmos chip information max6800/max6801/max6802 3-pin, low-power p reset circuits 6 _______________________________________________________________________________________ * sample stock is generally held on all standard versions. selector guide (standard versions * ) part output stage nominal v th (v) min reset timeout (ms) sot top mark max6800ur26d3-t push/pull reset 2.63 100 fzie max6800ur29d3-t push/pull reset 2.93 100 fzif max6800ur31d3-t push/pull reset 3.08 100 fzig max6800ur44d3-t push/pull reset 4.38 100 fzih max6800ur46d3-t push/pull reset 4.63 100 fzii max6801ur26d3-t push/pull reset 2.63 100 fzik max6801ur29d3-t push/pull reset 2.93 100 fzim max6801ur31d3-t push/pull reset 3.08 100 fzin max6801ur44d3-t push/pull reset 4.38 100 fzio max6801ur46d3-t push/pull reset 4.63 100 fzip max6802ur26d3-t open-drain reset 2.63 100 fziq max6802ur29d3-t open-drain reset 2.93 100 fzir max6802ur31d3-t open-drain reset 3.08 100 fzis max6802ur44d3-t open-drain reset 4.38 100 fzit max6802ur46d3-t open-drain reset 4.63 100 fziu package information for the latest package outline information and land patterns (footprints), go to www.maxim-ic.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. 3 sot23 u3-1 21-0051 90-0179
max6800/max6801/max6802 3-pin, low-power p reset circuits 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. 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 guidanc e. 7 _____________________maxim integrated products, 120 san gabriel drive, sunnyvale, ca 94086 408-737-7600 2012 maxim integrated products maxim is a registered trademark of maxim integrated products, inc. revision history revision number revision date description pages changed 3 10/11 added automotive-qualified part information to ordering information .1 4 3/12 updated factory-trimmed reset thresholds table. 5
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