________________general description the max6315 low-power cmos microprocessor ( p) supervisory circuit is designed to monitor power sup- plies in ? and digital systems. it provides excellent cir- cuit reliability and low cost by eliminating external components and adjustments. the max6315 also pro- vides a debounced manual reset input. this device performs a single function: it asserts a reset signal whenever the v cc supply voltage falls below a preset threshold or whenever manual reset is asserted. reset remains asserted for an internally programmed interval (reset timeout period) after v cc has risen above the reset threshold or manual reset is deasserted. the max6315? open-drain reset output can be pulled up to a voltage higher than v cc . the max6315 comes with factory-trimmed reset thresh- old voltages in 100mv increments from 2.5v to 5v. preset timeout periods of 1ms, 20ms, 140ms, and 1120ms (min) are also available. the device comes in a sot143 package. for microcontrollers (?s) and ?s with bidirectional reset pins, see the max6314 data sheet. ________________________applications computers controllers intelligent instruments critical ? and ? power monitoring portable/battery-powered equipment ____________________________features ? small sot143 package ? open-drain reset output can exceed v cc ? precision, factory-set v cc reset thresholds: 100mv increments from 2.5v to 5v ? four reset timeout periods available: 1ms, 20ms, 140ms, or 1120ms (minimum) ? immune to short v cc transients ? 5a supply current ? pin-compatible with max811 ? guaranteed over temperature max6315 open-drain sot p reset circuit ________________________________________________________________ maxim integrated products 1 1 2 4 3 v cc mr reset gnd max6315 sot143 top view pin configuration max6315 v cc v cc gnd reset ? reset mr laser- trimmed resistors reset circuitry __________typical operating circuit 19-2000; rev 3; 12/05 ordering information continued 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. part ? nominal v th (v) min t rp (ms) top mark ?? max6315us50d1-t 5.00 1 fx_ _ ______________ordering information ? the max6315 is available in a sot143 package, -40? to +125? temperature range. ?? the first two letters in the package top mark identify the part, while the remaining two letters are the lot tracking code. devices are available in both leaded and lead-free packaging. specify lead-free by replacing ?t?with ?t?when ordering. note: all devices available in tape-and-reel only. contact fac- tory for availability.
max6315 open-drain sot p reset circuit 2 _______________________________________________________________________________________ absolute maximum ratings electrical characteristics (v cc = +2.5v to +5.5v, t a = -40? to +125?, unless otherwise noted. typical values are at t a = +25?.) 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. note 1: the max6315 monitors v cc through an internal factory-trimmed voltage-divider that programs the nominal reset threshold. factory-trimmed reset thresholds are available in 100mv increments from 2.5v to 5v (see the ordering information ). v cc ........................................................................-0.3v to +6.0v reset ....................................................................-0.3v to +6.0v all other pins..............................................-0.3v to (v cc + 0.3v) input current (v cc ) .............................................................20ma output current ( reset ) ......................................................20ma rate of rise (v cc ) ...........................................................100v/? continuous power dissipation (t a = +70?) sot143 (derate 4mw/? above +70?) ........................320mw operating temperature range .........................-40? to +125? storage temperature range .............................-65? to +160? lead temperature (soldering, 10s) .................................+300? max6315us_ _d2-t (-40 c to +85?) max6315us_ _d1-t (-40 c to +125?) max6315us_ _d2-t (-40 c to +125?) t a = +25? v cc > 1.2v, i sink = 0.5ma v cc = 3.6v, no load (-40? to +85 c) v cc = 5.5v, no load (-40? to +85 c) 15 t a = -40? to +85? v th - 2.5% v th + 2.5% 16 48 20 28 40 0.8 2.4 v cc > v th , reset deasserted v th > 4.0v v cc = falling at 1mv/? max6315us_ _d1-t (-40 c to +85?) v cc > 4.25v, i sink = 3.2ma conditions v cc > 2.5v, i sink = 1.2ma v cc > 1.0v, i sink = 80? 0.3 x v cc 2.4 0.7 x v cc 0.3 0.3 0.3 v 12 t a = -40? to +125? 410 max6315us_ _d4-t (-40 c to +85?) max6315us_ _d3-t (-40 c to +125?) v cc = 3.6v, no load (-40? to +125?) v th - 3.5% v th + 3.5% max6315us_ _d4-t (-40 c to +125?) 896 2688 1120 1570 2240 112 336 max6315us_ _d3-t (-40 c to +85?) 140 200 280 ? 1 reset output leakage current v 0.4 v ol reset output voltage k ? 32 63 100 mr pull-up resistance v th - 1.8% v th v th + 1.8% v th reset threshold (note 1) ? 512 i cc v 1.0 5.5 v cc operating voltage range v cc supply current ns 500 mr to reset delay ns 100 mr glitch rejection ? 1 mr minimum input pulse v 0.8 v il mr input threshold ppm/? 60 ? v th /? reset threshold tempco ? 35 v cc to reset delay ms 1 1.4 2 t rp reset timeout period units min typ max symbol parameter v il v ih v ih v cc = 5.5v, no load (-40? to +125?) t a = -40? to +85? v th < 4.0v manual reset input
max6315 open-drain sot p reset circuit _______________________________________________________________________________________ 3 6 0 -50 -30 30 90 supply current vs. temperature 2 1 5 max6315-01 temperature (?) supply current ( a) -10 10 50 3 4 70 v cc = 5v v cc = 3v v cc = 1v 6 0 0 1 35 supply current vs. supply voltage 2 1 5 max6315-02 supply voltage (v) supply current ( a) 2 3 4 4 t a = -40? t a = +25? t a = +85? 50 0 -50 -30 10 90 power-down reset delay vs. temperature 10 40 max6315-03 temperature (?) power-down reset delay ( s) -10 20 30 30 50 70 v cc falling at 1mv/ s v th = 4.63v v th = 3.00v 1.04 0.96 -50 -30 10 90 normalized reset timeout period vs. temperature (v cc rising) 0.97 0.98 1.02 1.00 1.03 max6315-04 temperature (?) normalized reset timeout period -10 0.99 1.01 30 50 70 1.006 0.994 -50 -30 10 90 normalized reset threshold vs. temperature (v cc falling) 0.996 0.998 1.004 1.000 max6315-05 temperature (?) normalized reset threshold -10 1.002 30 50 70 100 0 10 100 1000 maximum transient duration vs. reset comparator overdrive 20 max6315-06 reset comp. overdrive, v th - v cc (mv) maximum transient duration ( s) 40 60 80 t a = +25? reset occurs above curve v th = 4.63v v t = 3.00v __________________________________________typical operating characteristics (t a = +25?, unless otherwise noted.) ______________________________________________________________pin description name function 1 gnd ground 2 reset active-low open-drain output. connect to an external pullup resistor. can be pulled up to a voltage higher than v cc , but less than 6v. pin 3 mr manual reset input. a logic-low on mr asserts reset. reset remains asserted as long as mr is low, and for the reset timeout period (t rp ) after the reset conditions are terminated. connect to v cc if not used. 4 v cc supply voltage and reset threshold monitor input
_______________detailed description reset output a microprocessor? (??) reset input starts the ? in a known state. the max6315 asserts reset to prevent code-execution errors during power-up, power- down, or brownout conditions. reset is guaranteed to be a logic-low for v cc > 1v (see the electrical characteristics table). once v cc exceeds the reset threshold, the internal timer keeps reset asserted for the reset timeout period (t rp ); after this interval reset goes high. if a brownout condition occurs (monitored voltage dips below its programmed reset threshold), reset goes low. any time v cc dips below the reset threshold, the internal timer resets to zero and reset goes low. the internal timer starts when v cc returns above the reset threshold, and reset remains low for the reset timeout period. the max6315? reset output structure is a simple open-drain n-channel mosfet switch. connect a pull- up resistor to any supply in the 0v to +6v range. select a resistor value large enough to register a logic low when reset is asserted ( see the electrical characteristics table), and small enough to register a logic high while supplying all input current and leakage paths connected to the reset line. a 10k ? pullup is sufficient in most applications. often, the pull-up connected to the max6315? reset output will connect to the supply voltage monitored at the ic? v cc pin. however, some systems may use the open-drain output to level-shift from the monitored sup- ply to reset circuitry powered by some other supply (figure 1). this is one useful feature of an open-drain output. keep in mind that as the max6315? v cc decreases below 1v, so does the ic? ability to sink current at reset . finally, with any pullup, reset will be pulled high as v cc decays toward 0v. the voltage where this occurs depends on the pull-up resistor value and the voltage to which it connects (see the electrical characteristics table). manual-reset input many ?-based products require manual-reset capa- bility, allowing the operator, a test technician, or exter- nal logic circuitry to initiate a reset. a logic low on mr asserts reset. reset remains asserted while mr is low, and for the reset active timeout period after mr returns high. mr has an internal 63k ? pullup resistor, so it can be left open if not used. connect a normally open momen- tary switch from mr to gnd to create a manual reset function; external debounce circuitry is not required. 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 additional noise immunity. __________applications information 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 transients (glitches). the typical operating character- istics show the maximum transient duration vs. reset threshold overdrive, for which reset pulses are not generated. the graph was produced using negative- going pulses, starting at v rst max and ending below the programmed reset threshold by the magnitude indi- cated (reset threshold overdrive). the graph shows the maximum pulse width that a negative-going v cc tran- sient may typically have without causing a reset pulse to be issued. as the transient amplitude increases (i.e., goes farther below the reset threshold), the maximum allowable pulse width decreases. a 0.1? bypass capacitor mounted close to v cc provides additional transient immunity. max6315 open-drain sot p reset circuit 4 _______________________________________________________________________________________ figure 1. max6315 open-drain reset output allows use with multiple supplies max6315 v cc gnd reset mr 5v system +5.0v +3.3v 10k ?
max6315 open-drain sot p reset circuit _______________________________________________________________________________________ 5 ___________________________________________ordering information (continued) part ? nominal v th (v) min t rp (ms) top mark ?? max6315us45d1-t 4.50 1 gc_ _ max6315us44d1-t ??? 4.39 1 gd_ _ max6315us43d1-t 4.30 1 ge_ _ max6315us42d1-t 4.20 1 gf_ _ max6315us41d1-t 4.10 1 gg_ _ max6315us40d1-t 4.00 1 gh_ _ max6315us39d1-t 3.90 1 gi_ _ max6315us38d1-t 3.80 1 gj_ _ max6315us37d1-t 3.70 1 gk_ _ max6315us36d1-t 3.60 1 gl_ _ max6315us35d1-t 3.50 1 gm_ _ max6315us34d1-t 3.40 1 gn_ _ max6315us33d1-t 3.30 1 go_ _ max6315us32d1-t 3.20 1 gp_ _ max6315us31d1-t 3.08 1 gq_ _ max6315us30d1-t 3.00 1 gr_ _ max6315us29d1-t 2.93 1 gs_ _ part ? max6315us37d2-t 3.70 20 hk_ _ max6315us36d2-t 3.60 nominal v th (v) min t rp (ms) 20 hl_ _ top mark ?? max6315us50d2-t 5.00 20 gx_ _ max6315us49d2-t 4.90 20 gy_ _ max6315us48d2-t 4.80 20 gz_ _ max6315us47d2-t 4.70 20 ha_ _ max6315us46d2-t 4.63 20 hb_ _ max6315us45d2-t 4.50 20 hc_ _ max6315us44d2-t ??? 4.39 20 hd_ _ max6315us43d2-t 4.30 20 he_ _ max6315us42d2-t 4.20 20 hf_ _ max6315us41d2-t 4.10 20 hg_ _ max6315us40d2-t 4.00 20 hh_ _ max6315us39d2-t 3.90 20 hi_ _ max6315us38d2-t 3.80 20 hj_ _ max6315us34d2-t 3.40 20 hn_ _ max6315us33d2-t 3.30 20 ho_ _ max6315us35d2-t 3.50 20 hm_ _ max6315us47d1-t 4.70 1 ga_ _ max6315us48d1-t 4.80 1 fz_ _ max6315us46d1-t 4.63 1 gb_ _ max6315us49d1-t 4.90 1 fy_ _ max6315us26d1-t ??? 2.63 1 gv_ _ max6315us27d1-t 2.70 1 gu_ _ max6315us28d1-t 2.80 1 gt_ _ max6315us25d1-t 2.50 1 gw_ _ max6315us29d2-t 2.93 20 hs_ _ max6315us28d2-t 2.80 20 ht_ _ max6315us26d2-t ??? 2.63 20 hv_ _ max6315us25d2-t 2.50 20 hw_ _ max6315us27d2-t 2.70 20 hu_ _ max6315us32d2-t 4.20 20 hp_ _ MAX6315US31D2-t 3.08 20 hq_ _ max6315us30d2-t 3.00 20 hr_ _ ? the max6315 is available in a sot143 package, -40? to +125? temperature range. ?? the first two letters in the package top mark identify the part, while the remaining two letters are the lot tracking code. ??? sample stocks generally held on the bolded products; also, the bolded products have 2,500 piece minimum-order quantities. non-bolded products have 10,000 piece minimum-order quantities. contact factory for details. devices are available in both leaded and lead-free packaging. specify lead-free by replacing ?t?with ?t?when ordering. note: all devices available in tape-and-reel only. contact factory for availability.
max6315 open-drain sot p reset circuit 6 _______________________________________________________________________________________ ___________________________________________ordering information (continued) part ? nominal v th (v) min t rp (ms) top mark ?? max6315us50d3-t 5.00 140 hx_ _ max6315us49d3-t 4.90 140 hy_ _ max6315us48d3-t 4.80 140 hz_ _ max6315us47d3-t 4.70 140 ia_ _ max6315us46d3-t ??? 4.63 140 ib_ _ max6315us45d3-t 4.50 140 ic_ _ max6315us44d3-t ??? 4.39 140 id_ _ max6315us43d3-t 4.30 140 ie_ _ max6315us42d3-t 4.20 140 if_ _ max6315us41d3-t 4.10 140 ig_ _ max6315us40d3-t 4.00 140 ih_ _ max6315us39d3-t 3.90 140 ii_ _ max6315us38d3-t 3.80 140 ij_ _ max6315us37d3-t 3.70 140 ik_ _ max6315us36d3-t 3.60 140 il_ _ max6315us35d3-t 3.50 140 im_ _ max6315us34d3-t 3.40 140 in_ _ max6315us33d3-t 3.30 140 io_ _ max6315us32d3-t 3.20 140 ip_ _ max6315us31d3-t ??? 3.08 140 iq_ _ max6315us30d3-t 3.00 140 ir_ _ max6315us29d3-t ??? 2.93 140 is_ _ jw_ _ 1120 2.50 max6315us25d4-t jv_ _ 1120 2.63 max6315us26d4-t ??? ju_ _ 1120 2.70 max6315us27d4-t jt_ _ 1120 2.80 max6315us28d4-t js_ _ 1120 2.93 max6315us29d4-t jr_ _ 1120 3.00 max6315us30d4-t jq_ _ 1120 3.08 max6315us31d4-t jp_ _ 1120 3.20 max6315us32d4-t jo_ _ 1120 3.30 max6315us33d4-t jn_ _ 1120 3.40 max6315us34d4-t jm_ _ 1120 3.50 max6315us35d4-t jl_ _ 1120 3.60 max6315us36d4-t jk_ _ 1120 3.70 max6315us37d4-t jj_ _ 1120 3.80 max6315us38d4-t ji_ _ 1120 3.90 max6315us39d4-t jh_ _ 1120 4.00 max6315us40d4-t jg_ _ 1120 4.10 max6315us41d4-t jf_ _ 1120 4.20 max6315us42d4-t je_ _ 1120 4.30 max6315us43d4-t jd_ _ 1120 4.39 max6315us44d4-t ??? jc_ _ 1120 4.50 max6315us45d4-t jb_ _ 1120 4.63 max6315us46d4-t top mark ?? min t rp (ms) nominal v th (v) part ? ? the max6315 is available in a sot143 package, -40? to +125? temperature range. ?? the first two letters in the package top mark identify the part, while the remaining two letters are the lot tracking code. ??? sample stocks generally held on the bolded products; also, the bolded products have 2,500 piece minimum-order quantities. non-bolded products have 10,000 piece minimum-order quantities. contact factory for details. devices are available in both leaded and lead-free packaging. specify lead-free by replacing ?t?with ?t?when ordering. note: all devices available in tape-and-reel only. contact factory for availability. ja_ _ 1120 4.70 max6315us47d4-t ix_ _ iy_ _ iz_ _ 1120 1120 1120 5.00 4.90 4.80 max6315us48d4-t max6315us49d4-t max6315us50d4-t max6315us28d3-t 2.80 140 it_ _ max6315us27d3-t 2.70 140 iu_ _ max6315us26d3-t ??? 2.63 140 iv_ _ max6315us25d3-t 2.50 140 iw_ _
max6315 open-drain sot p reset circuit ___________________chip information transistor count: 519 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 .) 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. 7 _____________________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.
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