general description the max6326/max6327/max6328/max6346/max6347/ max6348 microprocessor (p) supervisory circuits moni - tor the power supplies in p and digital systems. these devices provide excellent circuit reliability and low cost by eliminating external components and adjustments when used with 2.5v, 3v, 3.3v, and 5v powered circuits. these circuits perform a single function: they assert a reset signal whenever the v cc supply voltage declines below a preset threshold, keeping it asserted for at least 100ms after v cc has risen above the reset threshold. the only difference between the devices is their out - put. the max6326/max6346 (push-pull) and max6328/ max6348 (open-drain) have an active-low reset output. the max6327/max6347 have an active-high push-pull reset output. all of these parts are guaranteed to be in the correct state for v cc down to 1v. the reset comparator is designed to ignore fast transients on v cc . reset thresh - olds are factory-trimmable between 2.2v and 4.63v, in approximately 100mv increments. twenty-one standard versions are available. contact the factory for availability of nonstandard versions. ultra-low supply currents (1a max for the max6326/ max6327/max6328) make these parts ideal for use in portable equipment. all six devices are available in space- saving sot23 and sc70 packages. applications features ultra-low 1a (max) supply current (max6326/max6327/max6328) precision monitoring of 2.5v, 3v, 3.3v, and 5v power-supply voltages reset thresholds available from 2.2v to 4.63v fully specified over temperature 100ms (min) power-on reset pulse width low cost available in three versions: push-pull reset , push-pull reset, and open-drain reset power-supply transient immunity no external components 3-pin sc70/sot23 packages pin compatible with max803/max809/max810 selector guide appears at end of data sheet. 19-1294; rev 5; 4/14 computers intelligent instruments controllers critical p and c power monitoring portable/battery-powered equipment ?the max6326/max6327/max6328/max6346/max6347/ max6348 are available in factory-set v cc reset thresholds from 2.2v to 4.63v, in approximately 0.1v increments. choose the desired reset-threshold suffix from table 1 and insert it in the blank spaces following r. there are 21 standard ver - sions with a required order increment of 2500 pieces. sample stock is generally held on the standard versions only (see the selector guide). required order increment is 10,000 pieces for nonstandard versions (table 2). contact factory for availability. 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. part ? temp. range pin-package max6326 xr_ _-t -40c to +85c 3 sc70-3 max6326ur_ _-t -40c to +85c 3 sot23-3 max6327 xr_ _-t -40c to +85c 3 sc70-3 max6327ur_ _-t -40c to +85c 3 sot23-3 max6328 xr_ _-t -40c to +85c 3 sc70-3 max6328ur_ _-t -40c to +85c 3 sot23-3 max6346 xr_ _-t -40c to +85c 3 sc70-3 max6346ur_ _-t -40c to +85c 3 sot23-3 max6347 xr_ _-t -40c to +85c 3 sc70-3 max6347ur_ _-t -40c to +85c 3 sot23-3 max6348 xr_ _-t -40c to +85c 3 sc70-3 max6348ur_ _-t -40c to +85c 3 sot23-3 1 2 3 v cc (reset) reset gnd ( ) are for the max6327/max6347. max6326max6327 max6328 max6346 max6347 max6348 sot23-3/sc70-3 top view max6326/max6327/max6328/max6346/ max6347/max6348 3-pin, ultra-low-power sc70/sot p reset circuits pin coniguration ordering information downloaded from: http:///
terminal voltage (with respect to gnd) v cc ......................................................................... -0.3v to +6v reset, reset (push-pull) ...................... -0.3v to (v cc + 0.3v) reset (open drain) ................................................ -0.3v to +6v input current (v cc ) ........................................................... 20ma output current (reset, reset ) ...................................... 20ma rate of rise (v cc ) ........................................................ 100v/s continuous power dissipation (t a = +70c) 3-pin sc70 (derate 2.7mw/c above +70c) ............. 174mw 3-pin sot23 (derate 4mw/c above +70c) ............. 320mw operating temperature range ........................... -40c to +85c storage temperature range ............................ -65c to +150c lead temperature (soldering, 10s) ................................. +300c (v cc = full range, t a = -40c to +85c, unless otherwise noted. typical values are at t a = +25c and v cc = 3v.) (note 1) note 1: overtemperature limits are guaranteed by design and not production tested. parameter symbol conditions min typ max units v cc range t a = 0c to +70c 1.0 5.5 v t a = -40c to +85c 1.2 5.5 supply current i cc max632_ only, v cc = 3.0v for v th 2.93v, v cc = 3.2v for v th > 2.93v, no load 0.5 1.0 a v cc = 5.5v, no load 1.0 1.75 reset threshold v th table 1 t a = +25c v th - 1.5% v th v th + 1.5% v t a = -40c to +85c v th - 2.5% v th v th + 2.5% reset threshold tempco ?v th /c 40 ppm/c v cc to reset delay v cc = v th to (v th - 100mv) 20 s reset active timeout period 100 185 280 ms reset output voltage (max6326/max6328/ max6346/max6348) v ol i sink = 1.6ma, v cc > 2.1v, reset asserted 0.3 v i sink = 100a, v cc 1.2v, reset asserted 0.4 reset output voltage (max6326/max6346) v oh i source = 500a, v cc = 3.2v, max6326 only 0.8 v cc v i source = 800a, v cc = 4.5v, v th 4.38v 0.8 v cc i source = 800a, v cc = v th(max), v th 4.5v 0.8 v cc reset output voltage (max6327/max6347) v oh i source = 500a, v cc 2.1v, reset asserted 0.8 v cc v i source = 50a, v cc 1.2v, reset asserted 0.8 v cc v ol i sink = 1.2ma, v cc 3.2v, reset not asserted, max6327 only 0.3 i sink = 3.2ma, v cc 4.5v, reset not asserted, v th 4.38v 0.4 i sink = 3.2ma, v cc = v th(max) , v th 4.5v 0.4 reset threshold hysteresis max6326/max6327/max6328 6.3 mv max6346/max6347/max6348 9.5 open-drain reset output leakage current 0.1 a max6326/max6327/max6328/max6346/ max6347/max6348 3-pin, ultra-low-power sc70/sot p reset 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:///
(t a = +25c, unless otherwise noted.) pin name function max6326/max6346 max6328/max6348 max6327 max6347 1 1 gnd ground 2 reset active-low reset output. reset remains low while v cc is below the reset threshold and for at least 100ms after v cc rises above the reset threshold. reset is open-drain on the max6328/max6348 and push-pull on the max6326/max6346. 2 reset active-high reset output. reset remains high while v cc is below the reset threshold and for at least 100ms after v cc rises above the reset threshold. 3 3 v cc supply voltage 0 50 100 150 200 -40 0 -20 20 40 60 80 power-down reset delay vs. temperature max6326 toc02 temperature (c) reset delay (s) v od = 200mv v od = 10mv v od = 100mv v od = 20mv 130 150140 160 170 180 190 200 210 -40 0 -20 20 40 60 80 power-up reset timeout vs. temperature max6326 toc03 temperature (c) power-up reset timeout (ms) 500 0 1 100 1000 maximum transient duration vs. reset threshold overdrive (sc70) 100 300 400200 max6326 toc04 reset threshold overdrive, v th - v cc (mv) maximum transient duration (s) 10 0 0.30.2 0.1 0.4 0.5 0.6 0.7 0.8 0.9 1.0 -40 0 -20 20 40 60 80 supply current vs. temperature max6326 toc01 temperature (c) supply current (a) v cc = 3.3v v cc = 5v v cc = 1.2v max6326/max6327/max6328/max6346/ max6347/max6348 3-pin, ultra-low-power sc70/sot p reset circuits maxim integrated 3 www.maximintegrated.com typical operating characteristics pin description downloaded from: http:///
applications information interfacing to ps with bidirectional reset pinssince the reset output on the max6328/max6348 is open drain, these devices interface easily with micropro - cessors (ps) that have bidirectional reset pins, such as the motorola 68hc11. connecting the p supervisors reset output directly to the microcontrollers (cs) reset pin with a single pull-up resistor allows either device to assert reset (figure 1). negative-going v cc transients in addition to issuing a reset to the p 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 maxi- mum transient duration vs. reset threshold overdrive graph, for which reset pulses are not generated. the graph shows the maximum pulse width that a negative- going v cc transient may typically have when issuing a reset signal. as the amplitude of the transient increases, the maximum allowable pulse width decreases. figure 1. interfacing to ps with bidirectional reset pins ?factory-trimmed reset thresholds are available in approximately 100mv increments with a 1.5% room-temperature variance. table 1. factory-trimmed reset th resholds? part suffix reset threshold voltage, v th (v) t a = +25c t a = -40c to +85c min typ max min max max632_ _r 22 2.167 2.200 2.233 2.145 2.250 max632_ _r 23 2.285 2.320 2.355 2.262 2.375 max632_ _r 24 2.364 2.400 2.436 2.340 2.460 max632_ _r 25 2.462 2.500 2.537 2.437 2.562 max632_ _r 26 2.591 2.630 2.669 2.564 2.696 max632_ _r 27 2.660 2.700 2.741 2.633 2.768 max632_ _r 28 2.758 2.800 2.842 2.730 2.870 max632_ _r 29 2.886 2.930 2.974 2.857 3.000 max632_ _r 30 2.955 3.000 3.045 2.925 3.075 max632_ _r 31 3.034 3.080 3.126 3.003 3.150 max634_ _r 33 3.250 3.300 3.350 3.217 3.383 max634_ _r 34 3.349 3.400 3.451 3.315 3.485 max634_ _r 35 3.447 3.500 3.552 3.412 3.587 max634_ _r 36 3.546 3.600 3.654 3.510 3.690 max634_ _r 37 3.644 3.700 3.755 3.607 3.792 max634_ _r 38 3.743 3.800 3.857 3.705 3.895 reset gnd resetinput max6328max6348 motorola 68hcxx p gnd v cc v cc v cc max6326/max6327/max6328/max6346/ max6347/max6348 3-pin, ultra-low-power sc70/sot p reset circuits www.maximintegrated.com maxim integrated 4 downloaded from: http:///
?factory-trimmed reset thresholds are available in approximately 100mv increments with a 1.5% room-temperature variance. table 2. device marking codes and minimum order increments table 1. factory- trimmed reset thresholds? (continued) part suffix reset threshold voltage, v th (v) t a = +25c t a = -40c to +85c min typ max min max max634_ _r 39 3.841 3.900 3.958 3.802 3.997 max634_ _r 40 3.940 4.000 4.060 3.900 4.100 max634_ _r 41 4.038 4.100 4.161 3.997 4.202 max634_ _r 42 4.137 4.200 4.263 4.095 4.305 max634_ _r 43 4.235 4.300 4.364 4.192 4.407 max634_ _r 44 4.314 4.380 4.446 4.270 4.489 max634_ _r 45 4.432 4.500 4.567 4.387 4.612 max634_ _r 46 4.560 4.630 4.699 4.514 4.746 part top mark order increment (k) sot23 sc70 max6347 _r46-t fzbw acf 2.5 max6347_r45-t fzbv C 10 max6347_r44-t fzbu acl 2.5 max6347_r43-t fzbt C 10 max6347_r42-t fzbs C 10 max6347_r41-t fzbr C 10 max6347_r40-t fzbq C 10 max6347_r39-t fzbp C 10 max6347_r38-t fzbo C 10 max6347_r37-t fzbn C 10 max6347_r36-t fzbm C 10 max6347_r35-t fzbl C 10 max6347_r34-t fzbk C 10 max6347_r33-t fzbj C 10 max6327 _r31-t fmaa act 2.5 max6327_r30-t fnaa C 10 max6327_r29-t flaa acs 2.5 max6327_r28-t fkaa C 10 max6327_r27-t fjaa C 10 max6327_r26-t fiaa acr 2.5 max6327_r25-t fhaa C 10 max6327_r24-t fgaa C 10 max6327_r23-t ffaa acq 2.5 max6327_r22-t eiaa aai 2.5 part top mark order increment(k) sot23 sc70 max6346 _r46-t fzbi aco 2.5 max6346_r45-t fzbh C 10 max6346_r44-t fzbg ack 2.5 max6346_r43-t fzbf C 10 max6346_r42-t fzbe C 10 max6346_r41-t fzbd C 10 max6346_r40-t fzbc C 10 max6346_r39-t fzbb C 10 max6346_r38-t fzba C 10 max6346_r37-t fzaz C 10 max6346_r36-t fzay C 10 max6346_r35-t fzax C 10 max6346_r34-t fzaw C 10 max6346_r33-t fzav C 10 max6326 _r31-t fdaa ace 2.5 max6326_r30-t feaa C 10 max6326_r29-t fcaa acp 2.5 max6326_r28-t fbaa C 10 max6326_r27-t faaa C 10 max6326_r26-t ezaa aci 2.5 max6326_r25-t eyaa C 10 max6326_r24-t exaa C 10 max6326_r23-t ewaa ach 2.5 max6326_r22-t ehaa aah 2.5 max6326/max6327/max6328/max6346/ max6347/max6348 3-pin, ultra-low-power sc70/sot p reset circuits www.maximintegrated.com maxim integrated 5 downloaded from: http:///
table 2. device marking codes and minimum order increment s (con tinued) selector guide (standard versions*) * sample stock is generally held on all standard versions. part top mark order increment (k) sot23 sc70 max6348 _r46-t sot23 sc70 max6348_r46-t fzck acn 2.5 max6348_r45-t fzcj C 10 max6348_r44-t fzci acm 2.5 max6348_r43-t fzch C 10 max6348_r42-t fzcg C 10 max6348_r41-t fzcf C 10 max6348_r40-t fzce C 10 max6348_r39-t fzcd C 10 max6348_r38-t fzcc C 10 max6348_r37-t fzcb C 10 max6348_r36-t fzca C 10 max6348_r35-t fzbz C 10 part top mark order increment (k) sot23 sc70 max6348_r34-t fzby C 10 max6348_r33-t fzbx C 10 max6328 _r31-t fvaa acw 2.5 max6328_r30-t fwaa C 10 max6328_r29-t fuaa acv 2.5 max6328_r28-t ftaa C 10 max6328_r27-t fsaa C 10 max6328_r26-t fraa acj 2.5 max6328_r25-t fqaa C 10 max6328_r24-t fpaa C 10 max6328_r23-t foaa acu 2.5 max6328_r22-t ejaa aaj 2.5 part nominal v th (v) max634_ _r46-t 4.63 max634_ _r44-t 4.38 max632_ _r31-t 3.08 max632_ _r29-t 2.93 max632_ _r26-t 2.63 max632_ _r23-t 2.32 max632_ _r22-t 2.20 package type package code outline no. land pattern no. 3 sc70 x3-2 21-0075 90-0208 3 sot23 u3-1 21-0051 90-0179 max6326/max6327/max6328/max6346/ max6347/max6348 3-pin, ultra-low-power sc70/sot p reset circuits www.maximintegrated.com maxim integrated 6 chip information transistor count: 419 package info rm ation 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 0 12/05 initial release 1 4/14 no /v opns; removed automotive reference from applications section 1 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. max6326/max6327/max6328/max6346/ max6347/max6348 3-pin, ultra-low-power sc70/sot p reset circuits ? 2014 maxim integrated products, inc. 7 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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