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___________________________________________________________________ selector guide ________________general description the MAX6316?ax6322 family of microprocessor (?) supervisory circuits monitors power supplies and microprocessor activity in digital systems. it offers sev- eral combinations of push/pull, open-drain, and bidirec- tional (such as motorola 68hc11) reset outputs, along with watchdog and manual reset features. the selector guide below lists the specific functions available from each device. these devices are specifically designed to ignore fast negative transients on v cc . resets are guaranteed valid for v cc down to 1v. these devices are available in 26 factory-trimmed reset threshold voltages (from 2.5v to 5v, in 100mv incre- ments), featuring four minimum power-on reset timeout periods (from 1ms to 1.12s), and four watchdog timeout periods (from 6.3ms to 25.6s). thirteen standard ver- sions are available with an order increment requirement of 2500 pieces (see standard versions table); contact the factory for availability of other versions, which have an order increment requirement of 10,000 pieces. the MAX6316?ax6322 are offered in a miniature 5-pin sot23 package. ________________________applications portable computers computers controllers intelligent instruments portable/battery-powered equipment embedded control systems ____________________________features small 5-pin sot23 package available in 26 reset threshold voltages 2.5v to 5v, in 100mv increments four reset timeout periods 1ms, 20ms, 140ms, or 1.12s (min) four watchdog timeout periods 6.3ms, 102ms, 1.6s, or 25.6s (typ) four reset output stages active-high, push/pull active-low, push/pull active-low, open-drain active-low, bidirectional guaranteed reset valid to v cc = 1v immune to short negative v cc transients low cost no external components MAX6316?ax6322 5-pin ? supervisory circuits with watchdog and manual reset ________________________________________________________________ maxim integrated products 1 19-0496; rev 10; 10/11 _______________ordering information ordering information continued at end of data sheet. active-low open-drain MAX6316l MAX6316m max6317h max6321hp max6318lh max6318mh max6319lh max6319mh max6320p active-low push/pull active-high push/pull active-low bidirectional part watchdog input manual reset input max6322hp reset outputs* * the max6318/max6319/max6321/max6322 feature two types of reset output on each device. typical operating circuit and pin configurations appear at end of data sheet. for pricing, delivery, and ordering information, please contact maxim direct at 1-888-629-4642, or visit maxim? website at www.maxim-ic.com. 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. part temp range pin-package MAX6316 luk_ _ _ _ - t -40? to +125? 5 sot23 MAX6316luk_ _ _ _ / v - t -40? to +125? 5 sot23 MAX6316muk_ _ _ _ - t -40? to +125? 5 sot23 max6317 huk_ _ _ _ - t -40? to +125? 5 sot23 max6318 huk_ _ _ _ - t -40? to +125? 5 sot23 max6318mhuk_ _ _ _ - t -40? to +125? 5 sot23
electrical characteristics (v cc = 2.5v to 5.5v, t a = -40? to +125?, unless otherwise noted. typical values are at t a = +25?.) (note 1) MAX6316?ax6322 5-pin ? supervisory circuits with watchdog and manual reset 2 _______________________________________________________________________________________ absolute maximum ratings 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. voltage (with respect to gnd) v cc ......................................................................-0.3v to +6v reset (max6320/max6321/max6322 only)...... -0.3v to +6v all other pins.........................................-0.3v to (v cc + 0.3v) input/output current, all pins .............................................20ma continuous power dissipation (t a = +70?) sot23 (derate 7.1mw/? above +70?)...............571mw operating temperature range..........................-40? to +125? junction temperature ......................................................+150? storage temperature range..............................-65? to +160? lead temperature (soldering, 10s) .................................+300? soldering temperature (reflow) leaded package .........................................................+240? lead-free package .....................................................+260? note 1: overtemperature limits are guaranteed by design, not production tested. note 2: a factory-trimmed voltage divider programs the nominal reset threshold (v th ). factory-trimmed reset thresholds are available in 100mv increments from 2.5v to 5v (see table 1 at end of data sheet). note 3: guaranteed by design. parameter symbol conditions min typ max units operating voltage range v cc t a = -40? to +125? 1.0 5.5 v v cc = 5.5v 10 20 MAX6316/max6317/max 6318/max6320/max6321 v cc = 3.6v 5 12 v cc = 5.5v 3 12 supply current i cc max6319/max6322: mr unconnected v cc = 3.6v 3 8 ? reset threshold temperature coefficient ? v th /? 40 ppm/? t a = +25? v th - 1.5% v th v th + 1.5% reset threshold (note 2) v rst t a = -40? to +125? v th - 2.5% v th v th + 2.5% v reset threshold hysteresis 3mv max63_ _ a_-t 1 1.4 2 max63_ _ b_-t 20 28 40 max63_ _ c_-t 140 200 280 reset active timeout period t rp max63_ _ d_-t 1120 1600 2240 ms v cc to reset delay t rd v cc falling at 1mv/? 40 ? push/pull reset output (MAX6316l/max6317h/max6318_h/max6319_h/max6321hp/max6322hp) v cc 1.0v, i sink = 50? 0.3 v cc 1.2v, i sink = 100? 0.3 v cc 2.7v, i sink = 1.2ma 0.3 v ol v cc 4.5v, i sink = 3.2ma 0.4 v cc 2.7v, i source = 500? 0.8 x v cc reset output voltage v oh v cc 4.5v, i source = 800? v cc - 1.5 v res et ri se ti m e ( m ax 6316l, m ax 6318lh , m ax 6319lh ) t r rise time is measured from 10% to 90% of v cc ; c l = 5pf, v cc = 3.3v (note 3) 525 ns v cc 2.7v, i sink = 1.2ma 0.3 v ol v cc 4.5v, i sink = 3.2ma 0.4 v cc 1.8v, i source = 150? 0.8 x v cc v cc 2.7v, i source = 500? 0.8 x v cc reset output voltage v oh v cc 4.5v, i source = 800? v cc - 1.5 v
MAX6316?ax6322 5-pin ? supervisory circuits with watchdog and manual reset _______________________________________________________________________________________ 3 note 4: this is the minimum time reset must be held low by an external pulldown source to set the active pullup flip-flop. note 5: measured from reset v ol to (0.8 x v cc ), r load = . note 6: wdi is internally serviced within the watchdog period if wdi is left unconnected. note 7: the wdi input current is specified as the average input current when the wdi input is driven high or low. the wdi input is designed for a three-stated-output device with a 10? maximum leakage current and capable of driving a maximum capac- itive load of 200pf. the three-state device must be able to source and sink at least 200? when active. electrical characteristics (continued) (v cc = 2.5v to 5.5v, t a = -40? to +125?, unless otherwise noted. typical values are at t a = +25?.) (note 1) parameter symbol conditions min typ max units bidirectional reset output (MAX6316m/max6318mh/max6319mh) transitional flip-flop setup time t s (note 4) 400 ns v cc = 3.0v, c l = 120pf 333 v cc = 5.0v, c l = 200pf 333 v cc = 3.0v, c l = 250pf 666 reset output rise time (note 5) t r v cc = 5.0v, c l = 400pf 666 ns active pullup enable threshold v pth v cc = 5.0v 0.4 0.65 v reset active pullup current v cc = 5.0v 20 ma t a = -40? to +85? 4.2 4.7 5.2 reset pullup resistance t a = -40? to +125? 3.6 4.7 5.8 k ? open-drain reset output (max6320p/max6321hp/max6322hp) v cc > 1.0v, i sink = 50? 0.3 v cc > 1.2v, i sink = 100? 0.3 v cc > 2.7v, i sink = 1.2ma 0.3 reset output voltage v ol v cc > 4.5v, i sink = 3.2ma 0.4 v open-drain reset output leakage current i lkg 1.0 ? watchdog input (MAX6316/max6317h/max6318_h/max6320p/max6321hp) max63_ _ _w-t 4.3 6.3 9.3 max63_ _ _x-t 71 102 153 ms max63_ _ _y-t 1.12 1.6 2.4 watchdog timeout period t wd max63_ _ _z-t 17.9 25.6 38.4 s wdi pulse width t wdi v il = 0.3 x v cc, v ih = 0.7 x v cc 50 ns v il 0.3 x v cc wdi input threshold v ih (note 6) 0.7 x v cc v wdi = v cc , time average 120 160 wdi input current (note 7) i wdi v wdi = 0v, time average -20 -15 ? manual reset input (MAX6316_/max6317h/max6319_h/max6320p/max6322hp) v il 0.8 v ih v th > 4.0v 2.0 v il 0.3 x v cc mr input threshold v ih v th < 4.0v 0.7 x v cc v t a = -40? to +85? 1 mr input pulse width t a = -40? to +125? 1.5 ? mr glitch rejection 100 ns mr pullup resistance 35 52 75 k ? mr to reset delay v cc = 5v 230 ns
MAX6316?ax6322 5-pin ? supervisory circuits with watchdog and manual reset 4 _______________________________________________________________________________________ __________________________________________typical operating characteristics (t a = +25?, unless otherwise noted.) 0 2 1 4 3 8 7 6 5 10 9 -40 0 20 -20 40 60 80 100 MAX6316/max6317/max6318/max6320/max6321 supply current vs. temperature MAX6316toc01 temperature ( c) supply current ( a) v cc = 5v v cc = 3v v cc = 1v 0 30 20 10 50 40 90 80 70 60 100 -40 -20 0 20 40 60 80 100 v cc falling to reset propagation delay vs. temperature MAX6316toc02 temperature ( c) reset propagation delay ( s) v cc falling at 1mv/ s v rst - v cc = 100mv 140 180 160 240 220 200 300 280 260 320 -40 0 20 -20 40 60 80 100 MAX6316/max6317/max6319/max6320/max6322 manual reset to reset propagation delay vs. temperature MAX6316toc03 temperature ( c) propagation delay (ns) v cc = 5v 0.95 0.98 0.97 0.96 1.00 0.99 1.04 1.03 1.02 1.01 1.05 -40 -20 0 20 40 60 80 100 normalized reset timeout period vs. temperature MAX6316toc04 temperature ( c) normalized reset timeout period 0.95 0.98 0.97 0.96 1.00 0.99 1.04 1.03 1.02 1.01 1.05 -40 -20 0 20 40 60 80 100 MAX6316/max6317/max6318/max6320/max6321 normalized watchdog timeout period vs. temperature MAX6316toc05 temperature ( c) normalized watchdog timeout period 80 0 10 100 1000 maximum v cc transient duration vs. reset threshold overdrive 20 10 MAX6316toc06 reset threshold overdrive (mv) v rst - v cc transient duration ( s) 30 50 60 40 70 v rst = 3.3v v rst = 4.63v v rst = 2.63v reset occurs above lines passive 4.7k ? pullup 2v/div reset, active pullup 2v/div reset input 5v/div 200ns/div MAX6316m/6318mh/6319mh bidirectional pullup characteristics MAX6316toc07 100pf 4.7k ? +5v 74hc05 74hc05 v cc gnd mr 100pf input input +5v reset
MAX6316?ax6322 5-pin ? supervisory circuits with watchdog and manual reset _______________________________________________________________________________________ 5 ______________________________________________________________pin description 1 1 MAX6316m/max6318mh/max6319mh: bidirectional, active-low, reset output. intended to interface directly to microprocessors with bidirectional resets such as the motorola 68hc11. max6320p/max6321hp/max6322hp: open-drain, active-low, reset output. nmos out- put (sinks current only). connect a pullup resistor from reset to any supply voltage up to 6v. MAX6316l/max6318lh/max6319lh: active-low, reset output. cmos push/pull output (sources and sinks current). reset 1 4 5 3 2 max6319lh max6319mh max6322hp pin 4 5 3 2 max6318lh max6318mh max6321hp 3 4 5 1 2 max6317h active-low, manual reset input. pull low to force a reset. reset remains asserted for the duration of the reset timeout period after mr transitions from low to high. leave unconnected or connected to v cc if not used. mr 3 watchdog input. triggers a reset if it remains either high or low for the duration of the watchdog timeout period. the internal watchdog timer clears whenever a reset asserts or whenever wdi sees a rising or falling edge. to disable the watchdog fea- ture, leave wdi unconnected or three-state the dri- ver connected to wdi. wdi 4 supply voltage. reset is asserted when v cc drops below the reset threshold voltage (v rst ). reset remains asserted until v cc rises above v rst and for the duration of the reset timeout period (t rp ) once v cc rises above v rst . v cc 5 active-high, reset output. cmos push/pull output (sources and sinks current). inverse of reset. reset ground gnd 2 MAX6316l MAX6316m max6320p function name
MAX6316?ax6322 5-pin ? supervisory circuits with watchdog and manual reset 6 _______________________________________________________________________________________ _______________detailed description a microprocessor? (?) reset input starts or restarts the ? in a known state. the reset output of the MAX6316 max6322 ? supervisory circuits interfaces with the reset input of the ?, preventing code-execution errors during power-up, power-down, and brownout condi- tions (see the typical operating circuit ). the MAX6316/ max6317/max6318/max6320/max6321 are also capa- ble of asserting a reset should the ? become stuck in an infinite loop. reset output the MAX6316l/max6318lh/max6319lh feature an active-low reset output, while the max6317h/ max6318_h/max6319_h/max6321hp/max6322hp feature an active-high reset output. reset is guaran- teed to be a logic low and reset is guaranteed to be a logic high for v cc down to 1v. the max 6316?ax6322 assert reset when v cc is below the reset threshold (v rst ), when mr is pulled low (MAX6316_/max6317h/max6319_h/max6320p/ max6322hp only), or if the wdi pin is not serviced within the watchdog timeout period (t wd ). reset remains assert- ed for the specified reset active timeout period (t rp ) after v cc rises above the reset threshold, after mr transitions low to high, or after the watchdog timer asserts the reset (MAX6316_/max6317h/max6318_h/max6320p/ max6321hp). after the reset active timeout period (t rp ) expires, the reset output deasserts, and the watchdog timer restarts from zero (figure 2). MAX6316?max6322 v cc v cc wdi (all except max6319/max6322) 1.23v 52k ? 52k ? gnd reset (all except MAX6316/max6320p) reset (all except max6317) mr (all except max6318/max6321) reset generator watchdog timer watchdog transition detector figure 1. functional diagram v cc 1v 1v t rd v rst v rst t rd reset gnd reset t rp t rp gnd figure 2. reset timing diagram
MAX6316?ax6322 5-pin ? supervisory circuits with watchdog and manual reset _______________________________________________________________________________________ 7 bidirectional r r e e s s e e t t output the MAX6316m/max6318mh/max6319mh are designed to interface with ?s that have bidirectional reset pins, such as the motorola 68hc11. like an open-drain output, these devices allow the ? or other devices to pull the bidirectional reset ( reset ) low and assert a reset condi- tion. however, unlike a standard open-drain output, it includes the commonly specified 4.7k ? pullup resistor with a p-channel active pullup in parallel. this configuration allows the MAX6316m/max6318mh/ max6319mh to solve a problem associated with ?s that have bidirectional reset pins in systems where sev- eral devices connect to reset (figure 3). these ?s can often determine if a reset was asserted by an exter- nal device (i.e., the supervisor ic) or by the ? itself (due to a watchdog fault, clock error, or other source), and then jump to a vector appropriate for the source of the reset. however, if the ? does assert reset, it does not retain the information, but must determine the cause after the reset has occurred. the following procedure describes how this is done in the motorola 68hc11. in all cases of reset, the ? pulls reset low for about four external-clock cycles. it then releases reset , waits for two external-clock cycles, then checks reset ? state. if reset is still low, the ? concludes that the source of the reset was external and, when reset eventually reaches the high state, it jumps to the normal reset vector. in this case, stored- state information is erased and processing begins from scratch. if, on the other hand, reset is high after a delay of two external-clock cycles, the processor knows that it caused the reset itself and can jump to a different vector and use stored-state information to determine what caused the reset. a problem occurs with faster ?s; two external-clock cycles are only 500ns at 4mhz. when there are several devices on the reset line, and only a passive pullup resis- tor is used, the input capacitance and stray capacitance can prevent reset from reaching the logic high state (0.8 v cc ) in the time allowed. if this happens, all resets will be interpreted as external. the ? output stage is guaran- teed to sink 1.6ma, so the rise time can not be reduced considerably by decreasing the 4.7k ? internal pullup resistance. see bidirectional pullup characteristics in the typical operating characteristics . the MAX6316m/max6318mh/max6319mh overcome this problem with an active pullup fet in parallel with the 4.7k ? resistor (figures 4 and 5). the pullup transistor holds reset high until the ? reset i/o or the supervisory circuit itself forces the line low. once reset goes below v pth , a comparator sets the transition edge flip-flop, indi- cating that the next transition for reset will be low to high. when reset is released, the 4.7k ? resistor pulls reset up toward v cc . once reset rises above v pth but is below (0.85 x v cc ), the active p-channel pullup turns on. once reset rises above (0.85 x v cc ) or the 2? one-shot times out, the active pullup turns off. the parallel combination of the 4.7k ? pullup and the 4.7k ? mr** c in reset reset circuitry reset*** wdi* v cc MAX6316m max6318mh max6319mh c stray 68hc11 reset circuitry c in reset v cc other devices c in reset MAX6316m/max6318mh MAX6316m/max6319mh active-high push/pull max6318mh/max6319mh * ** *** figure 3. MAX6316m/max6318mh/max6319mh supports additional devices on the reset bus
MAX6316?ax6322 5-pin ? supervisory circuits with watchdog and manual reset 8 _______________________________________________________________________________________ v cc MAX6316m max6318mh max6319mh laser- trimmed resistors vref v cc 52k ? mr wdi (MAX6316m/ max6318mh) (MAX6316m/ max6319mh) reset generator 2 s one shot 2 s one shot watchdog on circuitry transition flip-flop rq s ff v cc 4.7k ? reset active pullup enable comparator 0.65v 0.85v cc gnd figure 4. MAX6316/max6318mh/max6319mh bidirectional reset output functional diagram
MAX6316?ax6322 5-pin ? supervisory circuits with watchdog and manual reset _______________________________________________________________________________________ 9 p-channel transistor on-resistance quickly charges stray capacitance on the reset line, allowing reset to transition from low to high within the required two elec- tronic-clock cycles, even with several devices on the reset line. this process occurs regardless of whether the reset was caused by v cc dipping below the reset threshold, the watchdog timing out, mr being asserted, or the ? or other device asserting reset . the parts do not require an external pullup. to minimize supply cur- rent consumption, the internal 4.7k ? pullup resistor dis- connects from the supply whenever the MAX6316m/ max6318mh/max6319mh assert reset. open-drain r r e e s s e e t t output the max6320p/max6321hp/max6322hp have an active-low, open-drain reset output. this output struc- ture will sink current when reset is asserted. connect a pullup resistor from reset to any supply voltage up to 6v (figure 6). select a resistor value large enough to register a logic low (see electrical characteristics ), 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. manual-reset input the MAX6316_/max6317h/max6319_h/max6320p/ max6322hp feature a manual reset input. a logic low on mr asserts a reset. after mr transitions low to high, reset remains asserted for the duration of the reset timeout peri- od (t rp ). the mr input is connected to v cc through an internal 52k ? pullup resistor and therefore can be left unconnected when not in use. mr can be driven with ttl-logic levels in 5v systems, with cmos-logic levels in 3v systems, or with open-drain or open-collector output devices. a normally-open momentary switch from mr to ground can also be used; it requires no external debouncing circuitry. mr is designed to reject fast, negative-going transients (typically 100ns pulses). a 0.1? capacitor from mr to ground provides additional noise immunity. the mr input pin is equipped with internal esd-protection circuitry that may become forward biased. should mr be driven by voltages higher than v cc , excessive current would be drawn, which would damage the part. for example, assume that mr is driven by a +5v supply other than v cc . if v cc drops lower than +4.7v, mr ? absolute maximum rating is violated [-0.3v to (v cc + 0.3v)], and undesirable current flows through the esd structure from mr to v cc . to avoid this, use the same supply for mr as the supply monitored by v cc . this guarantees that the voltage at mr will never exceed v cc . watchdog input the MAX6316_/max6317h/max6318_h/max6320p/ max6321hp feature a watchdog circuit that monitors the ?? activity. if the ? does not toggle the watchdog input (wdi) within the watchdog timeout period (t wd ), reset asserts. the internal watchdog timer is cleared by reset or by a transition at wdi (which can detect pulses as short as 50ns). the watchdog timer remains cleared while reset is asserted. once reset is released, the timer begins counting again (figure 7). the wdi input is designed for a three-stated output device with a 10? maximum leakage current and the capability of driving a maximum capacitive load of 200pf. the three-state device must be able to source and sink at least 200? when active. disable the watchdog function by leaving wdi unconnected or by three-stating the driver connected to wdi. when the watchdog timer is left open circuited, the timer is cleared internally at intervals equal to 7/8 of the watchdog period. max6320 max6321 max6322 v cc gnd reset wdi** mr* reset*** max6320/max6322 max6320/max6321 max6321/max6322 * ** *** 5v system +5.0v +3.3v 10k ? figure 6. max6320p/max6321hp/max6322hp open-drain reset output allows use with multiple supplies t r t s reset reset pulled low by c or reset generator active pullup turns on v cc 0.7v 0.8 x v cc t rp or c reset delay figure 5. bidirectional reset timing diagram
MAX6316?ax6322 5-pin ? supervisory circuits with watchdog and manual reset 10 ______________________________________________________________________________________ applications information watchdog input current the wdi input is internally driven through a buffer and series resistor from the watchdog counter. for minimum watchdog input current (minimum overall power con- sumption), leave wdi low for the majority of the watch- dog timeout period. when high, wdi can draw as much as 160?. pulsing wdi high at a low duty cycle will reduce the effect of the large input current. when wdi is left unconnected, the watchdog timer is serviced within the watchdog timeout period by a low-high-low pulse from the counter chain. negative-going v cc transients these supervisors are immune to short-duration, nega- tive-going v cc transients (glitches), which usually do not require the entire system to shut down. typically, 200ns large-amplitude pulses (from ground to v cc ) on the supply will not cause a reset. lower amplitude puls- es result in greater immunity. typically, a v cc transient that goes 100mv under the reset threshold and lasts less than 4? will not trigger a reset. an optional 0.1? bypass capacitor mounted close to v cc provides addi- tional transient immunity. ensuring valid reset outputs down to v cc = 0v the MAX6316_/max6317h/max6318_h/max6319_h/ max6321hp/max6322hp are guaranteed to operate properly down to v cc = 1v. in applications that require valid reset levels down to v cc = 0v, a pulldown resistor to active-low outputs (push/pull and bidirectional only, figure 8) and a pullup resistor to active-high outputs (push/pull only, figure 9) will ensure that the reset line is valid while the reset output can no longer sink or source current. this scheme does not work with the open-drain outputs of the max6320/max6321/max6322. the resistor value used is not critical, but it must be large enough not to load the reset output when v cc is above the reset threshold. for most applications, 100k ? is adequate. watchdog software considerations (MAX6316/max6317/max6318/ max6320/max6321) one way to help the watchdog timer monitor software execution more closely is to set and reset the watchdog input at different points in the program, rather than pulsing the watchdog input high-low-high or low-high- low. this technique avoids a stuck loop, in which the watchdog timer would continue to be reset inside the loop, keeping the watchdog from timing out. v cc t wd t rp t rp t rst wdi reset MAX6316/max6317 max6318/max6320 max6321 figure 7. watchdog timing relationship gnd *this schematic does not work on the open-drain outputs of the max6321/max6322. 100k ? v cc v cc reset max6317 max6318 max6319 max6321* max6322* figure 9. ensuring reset valid to v cc = 0v on active-high push/pull outputs gnd 100k ? v cc v cc reset MAX6316 max6318 max6319 figure 8. ensuring reset valid to v cc = 0v on active-low push/pull and bidirectional outputs
MAX6316?ax6322 5-pin ? supervisory circuits with watchdog and manual reset ______________________________________________________________________________________ 11 figure 10 shows an example of a flow diagram where the i/o driving the watchdog input is set high at the beginning of the program, set low at the end of every subroutine or loop, then set high again when the pro- gram returns to the beginning. if the program should hang in any subroutine, the problem would be quickly corrected, since the i/o is continually set low and the watchdog timer is allowed to time out, causing a reset or interrupt to be issued. as described in the watchdog input current section, this scheme results in higher time average wdi current than does leaving wdi low for the majority of the timeout period and periodically pulsing it low-high-low. start set wdi high program code subroutine or program loop set wdi low return possible infinite loop path figure 10. watchdog flow diagram gnd wdi mr 15v cc reset MAX6316 max6320 sot23 top view 2 34 gnd wdi mr 15v cc reset max6317 sot23 2 34 gnd wdi reset 15v cc reset max6318 max6321 sot23 2 34 gnd mr reset 15v cc reset max6319 max6322 sot23 2 34 __________________ pin configurations MAX6316 gnd manual reset i/o wdi mr gnd p v cc v in v cc reset reset typical operating circuit
table 2. standard versions table 1. factory-trimmed reset thresholds MAX6316?ax6322 5-pin ? supervisory circuits with watchdog and manual reset 12 ______________________________________________________________________________________ 2.438 2.563 2.463 2.500 2.538 max63___25_ _-t 2.564 2.696 2.591 2.630 2.669 max63___26_ _-t 2.633 2.768 2.660 2.700 2.741 max63___27_ _-t 2.730 2.870 2.758 2.800 2.842 max63___28_ _-t 2.857 3.000 2.886 2.930 2.974 max63___29_ _-t 2.925 3.075 2.955 3.000 3.045 max63___30_ _-t 3.003 3.157 3.034 3.080 3.126 max63___31_ _-t 3.120 3.280 3.152 3.200 3.248 max63___32_ _-t 3.218 3.383 3.251 3.300 3.350 max63___33_ _-t 3.315 3.485 3.349 3.400 3.451 max63___34_ _-t 3.413 3.588 3.448 3.500 3.553 max63___35_ _-t 3.510 3.690 3.546 3.600 3.654 max63___36_ _-t 3.608 3.793 3.645 3.700 3.756 max63___37_ _-t 3.705 3.895 3.743 3.800 3.857 max63___38_ _-t 3.803 3.998 3.842 3.900 3.959 max63___39_ _-t 3.900 4.100 3.940 4.000 4.060 max63___40_ _-t 3.998 4.203 4.039 4.100 4.162 max63___41_ _-t 4.095 4.305 4.137 4.200 4.263 max63___42_ _-t 4.193 4.408 4.236 4.300 4.365 max63___43_ _-t 4.270 4.490 4.314 4.390 4.446 max63___44_ _-t 4.388 4.613 4.433 4.500 4.568 max63___45_ _-t 4.514 4.746 4.561 4.630 4.699 max63___46_ _-t 4.583 4.818 4.630 4.700 4.771 max63___47_ _-t 4.680 4.920 4.728 4.800 4.872 max63___48_ _-t 4.778 5.023 7.827 4.900 4.974 max63___49_ _-t min max min typ max 4.875 5.125 t a = -40? to +125? t a = +25? 4.925 5.000 5.075 max63___50_ _-t part part reset threshold (v) minimum reset timeout (ms) typical watchdog timeouts (s) sot top mark MAX6316luk29cy-t 2.93 140 1.6 acde MAX6316luk46cy-t 4.63 140 1.6 acdd MAX6316muk29cy-t 2.93 140 1.6 acdg MAX6316muk46cy-t 4.63 140 1.6 acdf max6317huk46cy-t 4.63 140 1.6 acdq max6318lhuk46cy-t 4.63 140 1.6 acdh max6318mhuk46cy-t 4.63 140 1.6 acdj max6319lhuk46c-t 4.63 140 acdk max6319mhuk46c-t 4.63 140 acdm max6320puk29cy-t 2.93 140 1.6 acdo
table 3. reset/watchdog timeout periods MAX6316?ax6322 __ordering information (continued) note: these devices are available with factory-set v cc reset thresholds from 2.5v to 5v, in 0.1v increments. insert the desired nominal reset threshold (25 to 50, from table 1) into the blanks following the letters uk. all devices offer factory-pro- grammed reset timeout periods. insert the letter corresponding to the desired reset timeout period (a, b, c, or d from table 3) into the blank following the reset threshold suffix. parts that offer a watchdog feature (see selector guide) are factory-trimmed to one of four watchdog timeout periods. insert the letter corre- sponding to the desired watchdog timeout period (w, x, y, or z from table 3) into the blank following the reset timeout suffix. 5-pin ? supervisory circuits with watchdog and manual reset ______________________________________________________________________________________ 13 w 4.3 6.3 9.3 ms x 71 102 153 y 1.12 1.6 2.4 z 17.9 25.6 38.4 s reset timeout periods watchdog timeout substrate is internally connected to v+ chip information s 2.24 1.60 1.12 d 280 200 140 c 40 30 20 b 2 1.6 1 a units max typ min suffix ms note: thirteen standard versions are available, with a required order increment of 2500 pieces. sample stock is generally held on sta n- dard versions only. the required order increment for nonstandard versions is 10,000 pieces. contact factory for availability. part reset threshold (v) minimum reset timeout (ms) typical watchdog timeouts (s) sot top mark max6320puk46cy-t 4.63 140 1.6 acdn max6321hpuk46cy-t 4.63 140 1.6 acgl max6322hpuk46c-t 4.63 140 1.6 acgn table 2. standard versions (continued) 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. part temp range pin-package max6319 lhuk_ _ _ - t -40? to +125? 5 sot23 max6319mhuk_ _ _ - t -40? to +125? 5 sot23 max6320 puk_ _ _ _ - t -40? to +125? 5 sot23 max6320puk_ _ _ _ / v + -40? to +125? 5 sot23 max6321 hpuk_ _ _ - t -40? to +125? 5 sot23 max6322 hpuk_ _ _ - t -40? to +125? 5 sot23 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. 5 sot23 u5+2 21-0057 90-0174
MAX6316?ax6322 5-pin ? supervisory circuits with watchdog and manual reset 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. 14 ____________________maxim integrated products, 120 san gabriel drive, sunnyvale, ca 94086 408-737-7600 2011 maxim integrated products maxim is a registered trademark of maxim integrated products, inc. revision history revision number revision date description pages changed 0 1/98 initial release. 1 4/98 update to show max6319 as an existing part. 1, 2, 12 2 7/98 update specifications, selector guide , and table 2. 1, 12, 14 3 1/99 include extended temperature range in ec table globals, table 1, ordering information . 1, 2, 3, 12, 13, 14 4 11/99 update available products and versions in table 2 and ordering information . 1, 12, 14 5 9/02 addition of reset rise time specification to electrical characteristics table. 1, 2 6 12/05 add lead-free option to ordering information . 1, 13, 14 7 11/07 add automotive temperature to ordering information , electrical characteristics table, table 1, and updated package information . 1, 2, 3, 12, 13, 14 8 8/09 updated ordering information .13 9 6/10 added automotive part and soldering temperatures. 2, 13 10 10/11 added automotive-qualified part ordering option for MAX6316 family 1

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