general description the max6326/max6327/max6328/max6346/max6347/ max6348 microprocessor (?) supervisory circuits moni- tor the power supplies in ? 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 output. 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 compara- tor is designed to ignore fast transients on v cc . reset thresholds 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 (1? 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 computers intelligent instruments controllers automotive critical ? and ? portable/battery-powered power monitoring equipment features ? ultra-low 1 a (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 max6326/max6327/max6328/max6346/max6347/max6348 3-pin, ultra-low-power sc70/sot p reset circuits ________________________________________________________________ maxim integrated products 1 1 2 3 v cc (reset) reset gnd ( ) are for the max6327/max6347. max6326 max6327 max6328 max6346 max6347 max6348 sot23-3/sc70-3 top view pin configuration 19-1294; rev 4; 12/05 ? 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 ?. there are 21 standard versions with a required order increment of 2500 pieces. sample stock is gen- erally held on the standard versions only (see the selector guide). required order increment is 10,000 pieces for nonstan- dard 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. ordering information 3 sc70-3 3 sc70-3 3 sc70-3 -40? to +85? -40? to +85? -40? to +85? max6348 xr_ _-t max6347 xr_ _-t max6346 xr_ _-t 3 sc70-3 3 sc70-3 3 sc70-3 pin-package temp. range -40? to +85? -40? to +85? -40? to +85? max6328 xr_ _-t max6327 xr_ _-t max6326 xr_ _-t part ? 3 sot23-3 -40? to +85? max6326ur_ _-t 3 sot23-3 -40? to +85? max6327ur_ _-t 3 sot23-3 -40? to +85? max6328ur_ _-t 3 sot23-3 -40? to +85? max6346ur_ _-t 3 sot23-3 -40? to +85? max6347ur_ _-t 3 sot23-3 -40? to +85? max6348ur_ _-t selector guide appears at end of data sheet. 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.
max6326/max6327/max6328/max6346/max6347/max6348 3-pin, ultra-low-power sc70/sot p reset circuits 2 _______________________________________________________________________________________ absolute maximum ratings electrical characteristics (v cc = full range, t a = -40? to +85?, unless otherwise noted. typical values are at t a = +25? and v cc = 3v.) (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 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/? continuous power dissipation (t a = +70?) 3-pin sc70 (derate 2.7mw/? above +70?) ...............174mw 3-pin sot23 (derate 4mw/? above +70?)................320mw operating temperature range ...........................-40? to +85? storage temperature range .............................-65? to +150? lead temperature (soldering, 10s) .................................+300? note 1: overtemperature limits are guaranteed by design and not production tested. reset output voltage (max6327/max6347) v ol 0.4 i sink = 3.2ma, v cc = v th(max) , v th 4.5v 0.4 i sink = 3.2ma, v cc 4.5v, reset not asserted, v th 4.38v v v oh i source = 50?, v cc 1.2v, reset asserted 0.3 i sink = 1.2ma, v cc 3.2v, reset not asserted, max6327 only 0.8 v cc 0.8 v cc i source = 500?, v cc 2.1v, reset asserted 1.0 1.75 ? 0.5 1.0 supply current i cc v cc = 5.5v, no load reset threshold v th - v th v th + 1.5% 1.5% v v th v th - v th v th + 2.5% 2.5% table 1 t a = +25? t a = -40? to +85? 1.2 5.5 1.0 5.5 0.8 v cc 0.8 v cc 0.8 v cc open-drain reset output leakage current ? 0.1 reset threshold hysteresis mv 9.5 max6346/max6347/max6348 6.3 max6326/max6327/max6328 v cc to reset delay 20 ? v cc = v th to (v th - 100mv) parameter symbol min typ max units ms 100 185 280 v cc range v reset threshold tempco ? v th /? 40 ppm/? conditions t a = 0? to +70? t a = -40? to +85? v reset active timeout period i source = 800?, v cc = v th(max) , v th 4.5v reset output voltage (max6326/max6346) i source = 800?, v cc = 4.5v, v th 4.38v v oh i source = 500?, v cc = 3.2v, max6326 only max632_ only, v cc = 3.0v for v th 2.93v, v cc = 3.2v for v th > 2.93v, no load v 0.3 i sink = 1.6ma, v cc > 2.1v, reset asserted reset output voltage (max6326/max6328/ max6346/max6348) v ol 0.4 i sink = 100?, v cc 1.2v, reset asserted
pin max6326/max6327/max6328/max6346/max6347/max6348 3-pin, ultra-low-power sc70/sot p reset circuits _______________________________________________________________________________________ 3 __________________________________________typical operating characteristics (t a = +25?, unless otherwise noted.) 0 0.3 0.2 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 max6326-01 temperature (?) supply current ( a) v cc = 3.3v v cc = 5v v cc = 1.2v 0 50 100 150 200 -40 0 -20 20406080 power-down reset delay vs. temperature max6326-02 temperature (?) reset delay ( s) v od = 200mv v od = 10mv v od = 100mv v od = 20mv 130 150 140 160 170 180 190 200 210 -40 0 -20 20 40 60 80 power-up reset timeout vs. temperature max6326-03 temperature (?) power-up reset timeout (ms) 500 0 1 100 1000 maximum transient duration vs. reset threshold overdrive (sc70) 100 300 400 200 max6326-04 reset threshold overdrive, v th - v cc (mv) maximum transient duration ( s) 10 ______________________________________________________________pin description function 1 1 ground 2 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 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 supply voltage name gnd reset reset v cc max6327 max6347 max6326/max6346 max6328/max6348 pin
max6326/max6327/max6328/max6346/max6347/max6348 3-pin, ultra-low-power sc70/sot p reset circuits 4 _______________________________________________________________________________________ ____________ applications information interfacing to ps with bidirectional reset pins since the reset output on the max6328/max6348 is open drain, these devices interface easily with micro- processors (?s) that have bidirectional reset pins, such as the motorola 68hc11. connecting the ? supervisor? reset output directly to the microcon- troller? (??) 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 ? 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 increas- es, the maximum allowable pulse width decreases. figure 1. interfacing to ?s with bidirectional reset pins table 1. factory-trimmed reset thresholds factory-trimmed reset thresholds are available in approximately 100mv increments with a 1.5% room-temperature variance. reset gnd reset input max6328 max6348 motorola 68hcxx p gnd v cc v cc v cc 3.800 3.895 3.857 3.705 3.700 3.743 38 3.792 3.755 3.607 3.644 37 3.600 3.690 3.654 3.510 3.500 3.546 36 3.587 3.552 3.412 3.447 35 3.400 3.485 3.451 3.315 3.300 3.349 34 3.383 3.350 3.217 3.250 33 3.080 3.150 3.126 3.003 3.000 3.034 31 3.075 3.045 2.925 2.955 30 2.930 3.000 2.974 2.857 2.800 2.886 29 2.870 2.842 2.730 2.758 28 2.700 2.768 2.741 2.633 2.630 2.660 27 2.696 2.669 2.564 2.591 26 2.500 2.562 2.537 2.437 2.400 2.462 25 2.460 2.436 2.340 2.364 24 2.320 2.375 2.355 2.262 2.285 23 min typ max max min t a = -40? to +85? t a = +25? 2.250 reset threshold voltage, v th (v) 2.145 2.233 2.200 2.167 suffix max634_ _r max634_ _r max634_ _r max634_ _r max634_ _r max634_ _r max632_ _r max632_ _r max632_ _r max632_ _r max632_ _r max632_ _r max632_ _r max632_ _r max632_ _r part 22 max632_ _r
max6326/max6327/max6328/max6346/max6347/max6348 3-pin, ultra-low-power sc70/sot p reset circuits _______________________________________________________________________________________ 5 table 1. factory-trimmed reset thresholds (continued) 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 2.5 ehaa max6326_r22-t 10 2.5 exaa max6326_r24-t ewaa max6326_r23-t 10 eyaa max6326_r25-t 2.5 10 2.5 faaa max6326_r27-t ezaa max6326_r26-t 10 fcaa max6326_r29-t fbaa max6326_r28-t 10 2.5 10 fdaa max6326 _r31-t feaa max6326_r30-t 10 10 fzaw max6346_r34-t fzav max6346_r33-t 10 10 fzay max6346_r36-t fzax max6346_r35-t 10 fzba max6346_r38-t fzaz max6346_r37-t 10 10 10 fzbc max6346_r40-t fzbb max6346_r39-t 10 fzbe max6346_r42-t fzbd max6346_r41-t 2.5 10 fzbg max6346_r44-t fzbf max6346_r43-t 10 fzbh max6346_r45-t order increment (k) part 2.5 fzbi max6346 _r46-t 2.5 2.5 ffaa max6327_r23-t eiaa max6327_r22-t 10 10 fhaa max6327_r25-t fgaa max6327_r24-t 2.5 fiaa max6327_r26-t 10 10 10 fkaa max6327_r28-t fjaa max6327_r27-t 2.5 fnaa max6327_r30-t flaa max6327_r29-t 10 10 order increment (k) 2.5 fzbj max6347_r33-t part fmaa max6327 _r31-t 10 10 fzbl max6347_r35-t fzbk max6347_r34-t 10 10 fzbn max6347_r37-t fzbm max6347_r36-t 10 fzbp max6347_r39-t fzbo max6347_r38-t 10 10 10 fzbr max6347_r41-t fzbq max6347_r40-t 10 fzbt max6347_r43-t fzbs max6347_r42-t 10 2.5 fzbv max6347_r45-t fzbu max6347_r44-t 2.5 fzbw max6347 _r46-t aah ach aci acp ace ack top mark aco sot23 sc70 acq aai acr acs top mark act acl acf sot23 sc70 suffix 39 3.841 3.802 3.958 reset threshold voltage, v th (v) 3.997 min max max typ min 40 3.940 3.900 3.900 4.060 4.100 4.000 41 4.038 3.997 4.161 4.202 42 4.137 4.100 4.095 4.263 4.305 4.200 43 4.235 4.192 4.364 4.407 44 4.314 4.300 4.270 4.446 t a = +25? t a = -40? to +85? 4.489 4.380 45 4.432 4.387 4.567 4.612 46 4.560 4.500 4.514 4.699 4.746 4.630 part max634_ _r max634_ _r max634_ _r max634_ _r max634_ _r max634_ _r max634_ _r max634_ _r
max6326/max6327/max6328/max6346/max6347/max6348 3-pin, ultra-low-power sc70/sot p reset circuits 6 _______________________________________________________________________________________ ___________________chip information transistor count: 419 table 2. device marking codes and minimum order increments (continued) nominal v th (v) max634_ _r46-t 4.63 max634_ _r44-t 4.38 part 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 selector guide (standard versions*) *sample stock is generally held on all standard versions. sot23 order increment (k) part 10 10 10 fzca max6348_r36-t fzbz max6348_r35-t 10 fzcc max6348_r38-t fzcb max6348_r37-t 10 10 10 fzce max6348_r40-t fzcd max6348_r39-t 2.5 10 fzcg max6348_r42-t fzcf max6348_r41-t 2.5 10 fzci max6348_r44-t fzch max6348_r43-t 10 fzck max6348 _r46-t fzcj max6348_r45-t sc70 acm acn top mark 2.5 ejaa max6328_r22-t 10 2.5 fpaa max6328_r24-t foaa max6328_r23-t 10 fqaa max6328_r25-t 2.5 10 2.5 fsaa max6328_r27-t fraa max6328_r26-t 10 fuaa max6328_r29-t ftaa max6328_r28-t 10 2.5 top mark order increment (k) 10 fvaa max6328 _r31-t part fwaa max6328_r30-t 10 fzby max6348_r34-t fzbx max6348_r33-t aaj acu acj acv acw sot23 sc70
max6326/max6327/max6328/max6346/max6347/max6348 3-pin, ultra-low-power sc70/sot p reset circuits _______________________________________________________________________________________ 7 sotpo3l.eps 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 .)
max6326/max6327/max6328/max6346/max6347/max6348 3-pin, ultra-low-power sc70/sot 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. 8 _____________________maxim integrated products, 120 san gabriel drive, sunnyvale, ca 94086 408-737-7600 2005 maxim integrated products printed usa is a registered trademark of maxim integrated products, inc. sc70, 3l.eps package outline, 3l sc70 21-0075 1 1 c 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 .)
|
