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general description the max706p/r/s/t, max706ap/ar/as/at, andmax708r/s/t microprocessor (?) supervisory circuits reduce the complexity and number of components required to monitor +3v power-supply levels in +3v to +5v ? systems. these devices significantly improve system reliability and accuracy compared to separate ics or discrete components. the max706p/r/s/t and max706ap/ar/as/at supervi- sory circuits provide the following four functions: 1) a reset output during power-up, power-down, and brownout conditions. 2) an independent watchdog output that goes low if the watchdog input has not been toggled within 1.6s. 3) a 1.25v threshold detector for power-fail warning, low-battery detection, or for monitoring a powersupply other than the main supply. 4) an active-low, manual-reset input. the only difference between the max706r/ar, max706s/as, and max706t/at is the reset-threshold voltage levels, which are 2.63v, 2.93v, and 3.08v, respectively. all have active-low reset output signals. the max706p/ap are identical to the max706r/ar, except the reset output signal is active-high. the watch- dog timer function for the max706ap/ar/as/at dis- ables when the wdi input is left open or connected to a high-impedance state of a low-leakage tri-state output. the max708r/s/t provide the same functions as the max706r/s/t and max706ar/as/at except they do not have a watchdog timer. instead, they provide both reset and reset outputs. as with the max706, devices with r, s, and t suffixes have reset thresholdsof 2.63v, 2.93v, and 3.08v, respectively. these devices are available in 8-pin so, dip, and ?ax packages and are fully specified over the oper- ating temperature range. applications battery-powered equipmentportable instruments computers controllers intelligent instruments critical ? power monitoring features ? max package, small 8-pin so ? precision supply-voltage monitors 2.63v (max706p/r, max706ap/ar, and max708r) 2.93v (max706s, max706as, and max708s) 3.08v (max706t, max706at, and max708t) ? 200ms reset time delay ? debounced ttl/cmos-compatible manual reset input ? 100 a quiescent current ? wdi disable feature (max706ap/ar/as/at) ? watchdog timer: 1.6s timeout ? reset output signal: active-high only (max706p, max706ap) active-low only (max706r/s/t, max706ar/as/at) active-high and active-low (max708r/s/t) ? voltage monitor for power-fail or low-battery warning ? 8-pin surface-mount package ? guaranteed reset assertion to v cc = 1v max706p/r/s/t, max706ap/ar/as/at, max708r/s/t +3v voltage monitoring, low-cost p supervisory circuits ___________________________________________________ _____________ maxim integrated products 1 ordering information 19-0099; rev 5; 4/06 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. ordering information continued at end of data sheet. pin configurations appear at end of data sheet. ?ax is a registered trademark of maxim integrated products, inc. part ? temp range pin-package pkg code max706p cpa 0? to +70? 8 pdip p8-1 max706pcsa 0? to +70? 8 so s8-2 max706pcua 0? to +70? 8 ?ax u8-1 max706pepa -40? to +85? 8 pdip p8-1 ? so, ?ax, and pdip packages are available in lead-free. v cc pfi gnd mr pfo wdo reset unregulated dc pushbutton switch wdi i/o lineinterrupt p max639 dc-dcconverter +3v/+3.3v max706r/s/t max706ar/as/at v cc reset nmi typical operating circuits typical operating circuits continued at end of data sheet. downloaded from: http:///
max706p/r/s/t, max706ap/ar/as/at, max708r/s/t +3v voltage monitoring, low-cost p supervisory circuits 2 __________________________________________________ _____________________________________ absolute maximum ratings electrical characteristics (max70_p/r, max706ap/ar: v cc = 2.7v to 5.5v; max70_s, max706as: v cc = 3.0v to 5.5v; max70_t, max706at: v cc = 3.15v to 5.5v; t j = t a = t min to t max , unless otherwise noted. typical values are at t j = t a = +25 c.) (note 2) stresses beyond those listed under ?bsolute 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. terminal voltage (with respect to gnd) v cc ........................................................................-0.3v to +6v all other inputs (note 1)..........................-0.3v to (v cc + 0.3v) input current v cc ..................................................................................20ma gnd .................................................................................20ma output current (all outputs) ................................................20ma continuous power dissipation (t a = +70 c) 8-pin cerdip (derate 8mw/ c above +70 c)..............640mw 8-pin pdip (derate 9.1mw/ c above +70 c).............727.3mw 8-pin so (derate 5.9mw/ c above +70 c)................470.6mw 8-pin ?ax (derate 4.5mw/ o c above +70 c) ..............362mw operating temperature range max70_c .............................................................0 c to +70 c max70_e ..........................................................-40 c to +85 c max70_m .......................................................-55 c to +125 c junction temperature ......................................................+150 c storage temperature range .............................-65 c to +150 c lead temperature (soldering, 10s) .................................+300 c note 1: the input-voltage limits on pfi, wdi, and mr can be exceeded if the input current is less than 10ma. parameter symbol conditions min typ max units max70_c 1.0 5.5 supply voltage range v cc max70_e/m 1.2 5.5 v max706_c 90 200 max706_e/m 90 300 max708_c 50 200 v cc < 3.6v max708_e/m 50 300 max706_c 135 350 max706_e/m 135 500 max708_c 65 350 supply current i supply v cc < 5.5v max708_e/m 65 500 ? max70_p/r, max706ap/ar 2.55 2.63 2.70 max70_s, max706as 2.85 2.93 3.00 reset threshold (note 3)(v cc falling) v rst max70_t, max706at 3.00 3.08 3.15 v reset threshold hysteresis(note 3) v hys 20 mv max70_p/r, max706ap/ar v cc = 3.0v 140 200 280 max70_s, max706as, v cc = 3.3v 140 200 280 reset pulse width (note 3) t rst v cc = 5v 200 ms reset output v oh v rst ( max ) < v cc < 3.6v i source = 500a 0.8 x v cc v ol v rst ( max ) < v cc < 3.6v i sink = 1.2ma 0.3 v oh 4.5v < v cc < 5.5v i rsource = 800? v cc - 1.5 v ol 4.5v < v cc < 5.5v i sink = 3.2ma 0.4 max70_c v cc = 1.0v, i sink = 50a 0.3 output-voltage high(max70_r/s/t) (max706ar/as/at) v ol max70_e/m: v cc = 1.2v, i sink = 100a 0.3 v downloaded from: http:///
max706p/r/s/t, max706ap/ar/as/at, max708r/s/t +3v voltage monitoring, low-cost p supervisory circuits ___________________________________________________ ____________________________________ 3 electrical characteristics (continued) (max70_p/r, max706ap/ar: v cc = 2.7v to 5.5v; max70_s, max706as: v cc = 3.0v to 5.5v; max70_t, max706at: v cc = 3.15v to 5.5v; t j = t a = t min to t max , unless otherwise noted. typical values are at t j = t a = +25 c.) (note 2) parameter symbol conditions min typ max units v oh v rst ( max ) < v cc < 3.6v i source = 215? v cc 0.6 v ol v rst ( max ) < v cc < 3.6v i sink = 1.2ma 0.3 v oh 4.5 < v cc < 5.5v i source = 800? v cc - 1.5 output-voltage high(max706p) (max706ap) v ol 4.5v < v cc < 5.5v i sink = 3.2ma 0.4 v v oh v rst ( max ) < v cc < 3.6v i source = 500a 0.8 x v cc v ol v rst ( max ) < v cc < 3.6v i sink = 500a 0.3 v oh 4.5v < v cc < 5.5v i source = 800a v cc - 1.5 output-voltage high(max708_) v ol 4.5v < v cc < 5.5v i sink = 1.2ma 0.4 v watchdog input max706p/r, max706ap/ar, v cc = 3.0v 1.00 1.6 2.25 watchdog timeout period t wd max706s/t, max706as/at, v cc = 3.3v 1.00 1.6 2.25 s v il = 0.4v v rst(max) < v cc < 3.6v 100 wdi pulse width(max706_, max706a_) t wp v ih = 0.8v x v cc 4.5v < v cc < 5.5v 50 ns v il v rst(max) < v cc < 3.6v 0.6 v ih v rst(max) < v cc < 3.6v 0.7 x v cc v il v cc = 5.0v 0.8 watchdog input threshold(max706_, max706a_) v ih v cc = 5.0v 3.5 v max706_ -1.0 +0.02 +1.0 wdi input current wdi = 0v or v cc max706a_ -5 +5 ? downloaded from: http:///
max706p/r/s/t, max706ap/ar/as/at, max708r/s/t +3v voltage monitoring, low-cost p supervisory circuits 4 __________________________________________________ _____________________________________ electrical characteristics (continued) (max70_p/r, max706ap/ar: v cc = 2.7v to 5.5v; max70_s, max706as: v cc = 3.0v to 5.5v; max70_t, max706at: v cc = 3.15v to 5.5v; t j = t a = t min to t max , unless otherwise noted. typical values are at t j = t a = +25 c.) (note 2) parameter symbol conditions min typ max units watchdog output v oh v rst ( max ) < v cc < 3.6v i source = 500a 0.8 x v cc v ol v rst ( max ) < v cc < 3.6v i sink = 500a 0.3 v oh 4.5v < v cc < 5.5v i source = 800a v cc - 1.5 wdo output voltage (max706_, max706a_) v ol 4.5v < v cc < 5.5v i sink = 1.2ma 0.4 v manual reset input v rst(max) < v cc < 3.6v 25 70 250 mr pullup current mr = 0 4.5v < v cc < 5.5v 100 250 600 ? v rst(max) < v cc < 3.6v 500 mr pulse width t mr 4.5v < v cc < 5.5v 150 ns v il v rst(max) < v cc < 3.6v 0.6 v ih v rst(max) < v cc < 3.6v 0.7 x v cc v il 4.5v < v cc < 5.5v 0.8 mr input threshold v ih 4.5v < v cc < 5.5v 2.0 v v rst(max) < v cc < 3.6v 750 mr to reset output delay t md 4.5v < v cc < 5.5v 250 ns power-failure comparator (max70_p/r, max706ap/ar) pfi fallingv cc = 3.0v 1.2 1.25 1.3 pfi input threshold (max70_s/t, max706as/at) pfi falling,v cc = 3.3v 1.2 1.25 1.3 v pfi input current -25 +0.01 +25 na v oh v rst ( max ) < v cc < 3.6v i source = 500a 0.8 x v cc v ol v rst ( max ) < v cc < 3.6v i sink = 1.2ma 0.3 v oh 4.5v < v cc < 5.5v i source = 800a v cc - 1.5 pfo output voltage v ol 4.5v < v cc < 5.5v i sink = 3.2ma 0.4 v note 2: all devices 100% production tested at t a = +85 c. limits over temperature are guaranteed by design. note 3: applies to both reset in the max70_r/s/t and max706ar/as/at, and reset in the max706p/max706ap. downloaded from: http:///
max706p/r/s/t, max706ap/ar/as/at, max708r/s/t +3v voltage monitoring, low-cost p supervisory circuits _______________________________________________________________________________________ 5 typical operating characteristics (t a = +25?, unless otherwise noted.) typical operating characteristics downloaded from: http:///
max706p/r/s/t, max706ap/ar/as/at, max708r/s/t +3v voltage monitoring, low-cost p supervisory circuits 6 __________________________________________________ _____________________________________ pin description max706p max706ap max706r/s/t, max706ar/as/at max708r/s/t so/dip ?ax so/dip ?ax so/dip ?ax name function 131313 mr acti ve-low , m anual -reset inp ut. p ull m r b el ow 0.6v to tr i gg er a r eset pul se. m r i s ttl/c m os com p ati b l e w hen v c c = 5v and can b e shorted to gn d wi th a swi tch. m r i s i nter nal l y connected to a 70a sour ce curr ent. c onnect to v c c or l eave unconnected . 242424v c c s upp l y v ol tag e inp ut 3 5 3 5 3 5 gnd ground 4 6 4 6 4 6 pfi adjustable power-fail comparator input. connect pfi to aresistive divider to set the desired pfi threshold. when pfi is less than 1.25v, pfo goes low and sinks current; otherwise, pfo remains high. connect pfi to gnd if not used. 575757 pfo active-low, power-fail comparator output. pfo asserts when pfi is below the internal 1.25v threshold. pfo deasserts when pfi is above the internal 1.25v threshold. leave pfo unconnected if not used. 6 8 6 8 wdi watchdog input. a falling or rising transition must occur atwdi within 1.6s to prevent wdo from asserting (see figure 4). the internal watchdog timer is reset to zero when reset isasserted or when transition occurs at wdi. the watchdog function for the max706p/r/s/t can not be disabled. the watchdog timer for the max706ap/ar/as/at disables when wdi input is left open or connected to a tri-state output in its high-impedance state with a leakage current of less than 600na. 7 1 8 2 reset active-high reset output. reset remains high when v cc is below the reset threshold or mr is held low. it remains low for 200ms after the reset conditions end (figure 3). 8282 wdo active-low watchdog output. wdo goes low when a transition does not occur at wdi within 1.6s and remains lowuntil a transition occurs at wdi (indicating the watchdog interrupt has been serviced). wdo also goes low when v cc falls below the reset threshold; however, unlike the resetoutput signal, wdo goes high as soon as v cc rises above the reset threshold. 7 171 reset active-low reset output. reset remains low when v cc is below the reset threshold or mr is held low. it remains low for 200ms after the reset conditions end (figure 3). 6 8 n.c. no connection. not internally connected. downloaded from: http:///
max706p/r/s/t, max706ap/ar/as/at, max708r/s/t +3v voltage monitoring, low-cost p supervisory circuits ___________________________________________________ ____________________________________ 7 reset and reset outputs a microprocessor? (??) reset input starts in a knownstate. when the ? is in an unknown state, it should be held in reset. the max706p/r/s/t and the max706ap/ ar/as/at assert reset when v cc is low, preventing code execution errors during power-up, power-down,or brownout conditions. on power-up once v cc reaches 1v, reset is guaran- teed to be logic-low and reset is guaranteed to belogic-high. as v cc rises, reset and reset remain asserted. once v cc exceeds the reset threshold, the internal timer causes reset and reset to be deasserted after a time equal to the reset pulse width,which is typically 200ms (figure 3). if a power-fail or brownout condition occurs (i.e., v cc drops below the reset threshold), reset and reset are asserted. as long as v cc remains below the reset threshold, the internal timer is continually reset, causingthe reset and reset outputs to remain asserted. thus, a brownout condition that interrupts a previouslyinitiated reset pulse causes an additional 200ms delay from the time the latest interruption occurred. on power-down once v cc drops below the reset threshold, reset and reset are guaranteed to be asserted for v cc 1v. the max706p/max706ap provide a reset signal, andthe max706r/s/t and max706ar/as/at provide a reset signal. the max708r/s/t provide both reset and reset . watchdog timer the max706p/r/s/t and the max706ap/ar/as/atwatchdog circuit monitor the ?? activity. if the ? does not toggle the watchdog input (wdi) within 1.6s, the watchdog output ( wdo ) goes low (figure 4). if the reset signal is asserted, the watchdog timer will bereset to zero and disabled. as soon as reset is released, the timer starts counting. wdi can detect puls- es as narrow as 100ns with a 2.7v supply and 50ns with a4.5v supply. the watchdog timer for the max706p/r/s/t cannot be disabled. the watchdog timer for the max706ap/ar/as/at operates similarly to themax706p/r/s/t. however, the watchdog timer for the max706ap/ar/as/at disables when the wdi input is left open or connected to a tri-state output in its high- impedance state and with a leakage current of less than 600na. the watchdog timer can be disabled any- time, provided wdo is not asserted. reset generator v cc 70 a 8 7 reset reset 5 pfo gnd 3 1.25v 2.63v max708r2.93v max708s 3.08v max708t 1 mr 2 v cc 4 pfi max708r/s/t figure 1. max706_ functional diagram figure 2. max708_ functional diagram watchdog transition detector watchdog timer timebase for reset and watchdog reset generator v cc 70 a 8 wdo 7 reset(reset) 5 pfo gnd 3 1.25v 2.63v max706p/r2.93v max706s 3.08v max706t ( ) are for max706p/ap. 6 wdi 1 mr 2 v cc 4 pfi max706p/r/s/t max706ap/ar/as/at downloaded from: http:///
max706p/r/s/t, max706ap/ar/as/at, max708r/s/t +3v voltage monitoring, low-cost p supervisory circuits 8 __________________________________________________ _____________________________________ wdo can be connected to the nonmaskable interrupt (nmi) input of a ?. when v cc drops below the reset threshold, wdo immediately goes low, even if the watchdog timer has not timed out (figure 3). normally,this would trigger an nmi, but since reset is asserted simultaneously, the nmi is overridden. the wdo should not be connected to reset directly. instead, connect wdo to mr to generate a reset pulse when it times out. manual reset the manual reset ( mr ) input allows reset and reset to be activated by a pushbutton switch. the switch iseffectively debounced by the 140ms minimum reset pulse width. mr can be driven by an external logic line since it is ttl/cmos compatible. the minimum mr input pulse width is 500ns when v cc = +3v and 150ns when v cc = +5v. leave mr unconnected or connect to v cc when not used. power-fail comparator the power-fail comparator can be used for various pur-poses because its output and noninverting input are not internally connected. the inverting input is internally connected to a 1.25v reference. the power-fail com- parator has 10mv of hysteresis, which prevents repeat- ed triggering of the power-fail output ( pfo ). t rst t rst +3.3v 0v +3.3v +1v 0v reset reset wdo* +3.3v 0v mr* t mr *note: mr externally driven low. wdo timing shown for max706p/r/s/t. +3.3v 0v v cc v rst v rst t md t wp t wd t wd t wd +3v/+3.3v 0v wdi +3v/+3.3v 0v wdo +3v/+3.3v 0v reset t rst reset externally triggered by mr max706_ max708r/s/t reset (reset) 130k ? 1% parameter min typ max unit +12v resetthreshold at +25 c 10.24 10.87 11.50 v 1m ? 1% +3v/+3.3v +12v v cc pfi ( ) are for max706p/ap gnd mr pfo to p max706r/s/tmax708r/s/t max706ar/as/at reset r1 figure 4. max706ap/ar/as/at watchdog timing figure 3. reset, reset , mr , and wdo timing figure 5. monitoring both +3v/+3.3v and +12v figure 6. reset valid to gnd circuit downloaded from: http:///
max706p/r/s/t, max706ap/ar/as/at, max708r/s/t +3v voltage monitoring, low-cost p supervisory circuits ___________________________________________________ ____________________________________ 9 to build an early-warning power-failure circuit, use thepower-fail comparator input (pfi) to monitor the unregu- lated dc supply voltage (see the typical operating circuits ). connect the pfi to a resistive-divider network such that the voltage at pfi falls below 1.25v justbefore the regulator drops out. use pfo to interrupt the ? so it can prepare for an orderly power-down.regulated and unregulated voltages can be monitored by simply adjusting the pfi resistive-divider network values to the appropriate ratio. in addition, the reset signal can be asserted at voltages other that v cc reset threshold, as shown in figure 5. connect pfo to mr to initiate a reset pulse when the 12v supply drops belowa user-specified threshold (11v in this example) or when v cc falls below the reset threshold. operation with +3v and +5v supplies the max706p/r/s/t, the max706ap/ar/as/at, and themax708r/s/t provide voltage monitoring at the reset threshold (2.63v to 3.08v) when powered from either +3v or +5v. these devices are ideal in portable-instru- ment applications where power can be supplied from either a +3v battery or an ac-dc wall adapter that gen- erates +5v (a +5v supply allows a ? or a microcon- troller to run faster than a +3v supply). with a +3v supply, these ics consume less power, but output drive capability is reduced, the mr to reset delay time increases, and the mr minimum pulse width increases. the electrical characteristics table provides specifica- tions for operation with both +3v and +5v supplies. ensuring a valid reset output down to v cc = 0v when v cc falls below 1v, the max706r/s/t, max706ar/as/at, and max708r/s/t reset output no longer sinks current; it becomes an open circuit. high-impedance, cmos logic inputs can drift to undeter- mined voltages if left as open circuit. if a pulldown resistor is added to the reset pin , as shown in figure 6, any stray charge or leakage current will flow toground, holding reset low. resistor value r is not criti- cal, but it should not load reset and should be small enough to pull reset and the input it is driving to ground. 100k ? is suggested for r1. applications information adding hysteresis to the power-fail comparator hysteresis adds a noise margin to the power-fail com-parator and prevents repeated triggering of the pfo when v in is near the power-fail comparator trip point. figure 7 shows how to add hysteresis to the power-failcomparator. select the ratio of r1 and r2 such that pfi max706_ max708r/s/t v cc gnd pfi *optional r2 r3 r1 v in +3v/+3.3v c1* to p pfo v trip = 1.25 (r1 + r2) r2 pfo +3v/+3.3v 0v 0v v h v h = 1.25 (1 + r3 + r2 r1) v l = 1.25 + r1 1.25 - v cc - 1.25 r2 r3 r2 r3 v trip v in v l max706_ max708r/s/t v cc gnd pfi r2 r1 +3v/+3.3v pfo pfo +3v/+3.3v 0v note: v trip is negative. 0v v trip v- v cc - 1.25 = 1.25 - v trip r1 r2 v- figure 8. monitoring a negative voltage figure 7. adding hysteresis to the power-fail comparator downloaded from: http:///
max706p/r/s/t, max706ap/ar/as/at, max708r/s/t +3v voltage monitoring, low-cost p supervisory circuits 10 _________________________________________________ _____________________________________ ordering information (continued) chip information process: cmos sees 1.25v when v in falls to the desired trip point (v trip ). resistor r3 adds hysteresis. r3 will typically be an order of magnitude greater than r1 and r2. thecurrent through r1 and r2 should be at least 1? to ensure that the 25na (max) pfi input current does not shift the trip point significantly. r3 should be larger than 10k ? to prevent it from loading down the pfo pin. capacitor c1 adds noise rejection. monitoring a negative voltage the power-fail comparator can be used to monitor anegative supply voltage using the circuit of figure 8. when the negative supply is valid, pfo is low. when the negative supply voltage drops, pfo goes high. this circuit? accuracy is affected by the pfi threshold toler-ance, the v cc voltage, and resistors r1 and r2. bypassing v cc for noisy systems, bypass v cc with a 0.1? capacitor to gnd. part ? temp range pin-package pkg code max706peua -40? to +85? 8 ?ax u8-1 max706pmja -55? to +125? 8 cerdip* j8-2 max706r cpa 0? to +70? 8 plastic dip p8-1 MAX706RCSA 0? to +70? 8 so s8-2 max706rcua 0? to +70? 8 ?ax u8-1 max706repa -40? to +85? 8 plastic dip p8-1 max706resa -40? to +85? 8 so s8-2 max706reua -40? to +85? 8 ?ax u8-1 max706rmja -55? to +125? 8 cerdip* j8-2 max706s cpa 0? to +70? 8 plastic dip p8-1 max706scsa 0? to +70? 8 so s8-2 max706scua 0? to +70? 8 ?ax u8-1 max706sepa -40? to +85? 8 plastic dip p8-1 max706sesa -40? to +85? 8 so s8-2 max706seua -40? to +85? 8 ?ax u8-1 max706smja -55? to +125? 8 cerdip* j8-2 max706t cpa 0? to +70? 8 plastic dip p8-1 max706tcsa 0? to +70? 8 so s8-2 max706tcua 0? to +70? 8 ?ax u8-1 max706tepa -40? to +85? 8 plastic dip p8-1 max706tesa -40? to +85? 8 so s8-2 max706teua -40? to +85? 8 ?ax u8-1 max706tmja -55? to +125? 8 cerdip* j8-2 m a x7 0 6 a p e p a -40? to +85? 8 plastic dip p8-1 m ax 706ap e s a -40? to +85? 8 so s8-2 m ax 706ap e u a -40? to +85? 8 ?ax u8-1 max706ar epa -40? to +85? 8 plastic dip p8-1 max706aresa -40? to +85? 8 so s8-2 max706areua -40? to +85? 8?ax u8-1 max706as epa -40? to +85? 8 plastic dip p8-1 part ? temp range pin-package pkg code max706asesa -40? to +85? 8 so s8-2 max706aseua -40? to +85? 8 ?ax u8-1 max706at epa -40? to +85? 8 plastic dip p8-1 max706atesa -40? to +85? 8 so s8-2 max706ateua -40? to +85? 8 ?ax u8-1 max708r cpa 0? to +70? 8 plastic dip p8-1 max708rcsa 0? to +70? 8 so s8-2 max708rcua 0? to +70? 8 ?ax u8-1 max708repa -40? to +85? 8 plastic dip p8-1 max708resa -40? to +85? 8 so s8-2 max708reua -40? to +85? 8 ?ax u8-1 max708rmja -55? to +125? 8 cerdip* j8-2 max708s cpa 0? to +70? 8 plastic dip p8-1 max708scsa 0? to +70? 8 so s8-2 max708scua 0? to +70? 8 ?ax u8-1 max708sepa -40? to +85? 8 plastic dip p8-1 max708sesa -40? to +85? 8 so s8-2 max708seua -40? to +85? 8 ?ax u8-1 max708smja -55? to +125? 8 cerdip* j8-2 max708t cpa 0? to +70? 8 plastic dip p8-1 max708tcsa 0? to +70? 8 so s8-2 max708tcua 0? to +70? 8 ?ax u8-1 max708tepa -40? to +85? 8 plastic dip p8-1 max708tesa -40? to +85? 8 so s8-2 max708teua -40? to +85? 8 ?ax u8-1 max708tmja -55? to +125? 8 cerdip* j8-2 ? so, ?ax, and pdip packages are available in lead-free. *contact factory for availability and processing to mil-std-883. downloaded from: http:///
max706p/r/s/t, max706ap/ar/as/at, max708r/s/t +3v voltage monitoring, low-cost p supervisory circuits ___________________________________________________ ___________________________________ 11 v cc pfi gnd mr pfo reset reset unregulated dc pushbutton switch interrupt p max639 dc-dcconverter -3v/+3.3v max708r/s/t v cc reset typical operating circuits (continued) 12 3 4 87 6 5 wdo reset wdi pfo pfipfi v cc mr max max706p/r/s/t max706ap/ar/ as/at 12 3 4 87 6 5 n.c. gnd gnd v cc mr max max708r/s/t ( ) are for max706p/ap only. (reset) reset pfo reset top view 12 3 4 87 6 5 wdoreset wdi wdi pfo pfi gnd v cc mr dip/so max706p max706ap 12 3 4 87 6 5 reset pfo pfi gnd v cc mr dip/so max706r/s/t max706ar/as/at wdo n.c. 12 3 4 87 6 5 reset pfo pfi gnd v cc mr dip/so max708r/s/t reset pin configurations downloaded from: http:///
max706p/r/s/t, max706ap/ar/as/at, max708r/s/t +3v voltage monitoring, low-cost p supervisory circuits 12 _________________________________________________ _____________________________________ 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 .) cdips.eps downloaded from: http:///
max706p/r/s/t, max706ap/ar/as/at, max708r/s/t +3v voltage monitoring, low-cost p supervisory circuits ___________________________________________________ ___________________________________ 13 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 .) downloaded from: http:///
max706p/r/s/t, max706ap/ar/as/at, max708r/s/t +3v voltage monitoring, low-cost p supervisory circuits 14 _________________________________________________ _____________________________________ 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 .) downloaded from: http:///
max706p/r/s/t, max706ap/ar/as/at, max708r/s/t +3v voltage monitoring, low-cost p supervisory circuits maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a maxim product. no circuit patent licenses are implied. maxim reserves the right to change the circuitry and specifications without notice at any time. maxim integrated products, 120 san gabriel drive, sunnyvale, ca 94086 408-737-7600 ____________________ 15 2006 maxim integrated products printed usa is a registered trademark of maxim integrated products, inc. 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 .) pdipn.eps downloaded from: http:///

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