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general description the mxd1810Cmxd1813/mxd1815Cmxd1818 family of microprocessor (p) reset circuits monitor power sup- plies in p and digital systems. these devices provide excellent circuit reliability and low cost by eliminating external components and adjustments when used with +2.5v/+3.0v/+3.3v (mxd1815Cmxd1818), and +5v (mxd1810Cmxd1813) systems. these circuits assert a reset signal whenever the v cc supply voltage declines below a preset threshold, keeping reset asserted for at least 100ms after v cc rises above the reset threshold. the mxd1813/ mxd1818 also keep reset asserted for at least 100ms after the output is momentarily pulled to gnd by an external push-button switch. the mxd1812/mxd1817 have an active-high push-pull reset output. the mxd1810/mxd1815 (push-pull) and mxd1811/mxd1813/mxd1816/md1818 (open-drain) have an active-low reset output. the open-drain devices (mxd1811/mxd1813/mxd1816/mxd1818) have an internal pullup resistor to v cc . the mxd1813/ mxd1818 feature a debounced manual reset feature that asserts a reset if the reset pin is pulled low for more than 1.5s. when used to initiate manual reset, reset debounces signals from devices such as mechanical switches. for devices with this feature, the release of the external switch triggers the reset period. the mxd1810Cmxd1813/mxd1815Cmxd1818 are guaranteed to output the correct logic state for v cc down to +1v. these ics provide a reset comparator designed to ignore fast transients on v cc . reset thresholds are available between +2.18v and +4.62v. these small, low-power (4a) devices are ideal for use in portable equipment. all are available in space-saving 3-pin sc70 and sot23 packages, and are specified from -40c to +105c. applications computers and controllers intelligent instruments set-top boxes printers automotive systems critical p and c monitoring portable/battery-powered equipment * patent pending features precision monitoring of +2.5v, +3v, +3.3v, and +5v power-supply voltages available in four reset output configurations factory-set reset threshold voltages: 2.18v, 2.31v, 2.55v, 2.88v, 3.06v, 4.12v, 4.37v, 4.62v 2.5% reset threshold accuracy over temperature fixed reset timeout period: 100ms (min) guaranteed reset/ reset valid to v cc = +1v debounced manual reset detect (mxd1813/mxd1818) power-supply transient immunity no external components low power consumption (4a) pin compatible with ds181_ products (sot23) 3-pin sc70 and sot23 packages low-power p reset circuits in 3-pin sc70/sot23 ________________________________________________________________ maxim integrated products 1 pin configurations 19-2243; rev 1; 12 /05 for pricing, delivery, and ordering information, please contact maxim/dallas direct! at 1-888-629-4642, or visit maxims website at www.maxim-ic.com. the mxd1810Cmxd1813/mxd1815Cmxd1818 are available with factory-set v cc reset thresholds from +2.18v to +3.06v (mxd1815Cmxd1818) and +4.12v to +4.62v (mxd1810C mxd1813). choose the desired reset-threshold suffix from the reset threshold table and insert it in place of the _ _ follow- ing r in the part number. all devices are available in tape- and-reel only in 2500 unit increments. other threshold voltages may be available. contact factory for availability. devices are available in both leaded and lead-free packaging. specify lead-free by replacing -t with +t when ordering. ordering information continued at end of data sheet. ordering information part temp range pin-package mxd1810 ur_ _-t -40 o c to +105 o c 3 sot23-3 mxd1810xr_ _-t -40 o c to +105 o c 3 sc70-3 reset (reset) 1 3 gnd v cc mxd181_x sc70-3 top view 2 () are for the mxd1812/mxd1817 reset (reset) 1 3 gnd v cc mxd181_u sot23-3 2 ? ? mxd1810Cmxd1813/mxd1815Cmxd1818*
mxd1810Cmxd1813/mxd1815Cmxd1818 low-power p reset circuits in 3-pin sc70/sot23 2 _______________________________________________________________________________________ absolute maximum ratings electrical characteristics (v cc = full range, t a = -40c to +105c, unless otherwise specified. typical values are at t a = +25c.) (note 1) stresses beyond those listed under absolute 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. v cc to gnd ...........................................................-0.3v to +6.0v push-pull reset (mxd1810/mxd1815), reset (mxd1812/mxd1817) to gnd.....-0.3v to (v cc + 0.3v) open-drain reset (mxd1811/mxd1816) to gnd................................................................-0.3v to +6.0v open-drain reset (mxd1813/mxd1818) to gnd ....................................................-0.3v to (v cc + 0.3v) input current (v cc , reset ) ................................................20ma output current ( reset , reset).........................................20ma continuous power dissipation (t a = +70c) 3-pin sc70 (derate 2.17mw above +70c) ..................174mw 3-pin sot23 (derate 4mw/c above +70c) ...............320mw operating temperature range .........................-40c to +105c junction temperature ......................................................+150c storage temperature range .............................-65c to +150c lead temperature (soldering, 10s) .................................+300c parameter symbol conditions min typ max units t a = 0c to +105c 1.0 5.5 supply voltage range v cc t a = -40c to +105c 1.2 5.5 v v cc = +5.5v, v cc > v th , no load 9 16 supply current i cc v cc = +3.6v, v cc > v th , no load 4 10 a mxd181_ _ r46 4.50 4.62 4.75 mxd181_ _ r44 4.25 4.37 4.49 mxd181_ _ r41 4.00 4.12 4.24 mxd181_ _ r31 2.98 3.06 3.15 mxd181_ _ r29 2.80 2.88 2.97 mxd181_ _ r26 2.47 2.55 2.64 mxd181_ _ r23 2.25 2.31 2.37 reset threshold v th mxd181_ _ r22 2.12 2.18 2.25 v active reset timeout period t rp v cc rising 100 150 250 ms v cc = (v th + 100mv) falling to (v th - 200mv) 2 5 s v cc to reset delay t rd v cc rising, t r = 5s 100 150 250 ms push-button detect to reset t pb mxd1813/mxd1818 only 1.5 s push-button reset timeout period t pbrst mxd1813/mxd1818 only 100 150 250 ms t a = +25c to +105c 0.34 input low voltage v il mxd1813/mxd1818 only t a = -40c to +25c 0.15 v input high voltage v ih mxd1813/mxd1818 only 0.7 v cc v reset output source current i oh v cc v th(max) , reset not asserted, mxd1810/mxd1815 350 a reset output source current i oh v cc v th(min) , reset asserted, mxd1812/mxd1817 350 a reset output sink current i ol v cc 2.7v, reset asserted, v out = 0.4v mxd1810/mxd1811/mxd1813/mxd1815/ mxd1816/mxd1818 (note 2) 10 ma reset output sink current i ol v cc 2.7v, reset not asserted, , v out = 0.4v mxd1812/mxd1817 10 ma
mxd1810Cmxd1813/mxd1815Cmxd1818 low-power p reset circuits in 3-pin sc70/sot23 _______________________________________________________________________________________ 3 electrical characteristics (cont i nued) (v cc = full range, t a = -40c to +105c, unless otherwise specified. typical values are at t a = +25c.) (note 1) note 1 : production testing done at t a = +25c; limits over temperature guaranteed by design. note 2 : the mxd1811/mxd1813/mxd1816/mxd1818 have an internal pullup resistor which may deliver 1ma of sink current. note 3 : guaranteed by design. parameter symbol conditions min typ max units output high voltage v oh 0 < i oh < 500a v cc - 0.5 v cc - 0.1 v output capacitance (note 2) c out 10 pf mxd1811/mxd1816 3.5 5.5 7.5 internal pullup resistor open-drain r p mxd1813/mxd1818 3.1 5.5 7.5 k 0 2 6 4 8 10 -40 20 -10 50 80 110 supply current vs. temperature mxd1810-13/15-18 toc01 temperature ( c) supply current ( a) reset/reset not asserted v cc = +2.5v v cc = +3.3v v cc = +5v 140 148 144 156 152 160 -40 20 50 -10 80 110 reset timeout period vs. temperature (v cc rising) mxd1810-13/15-18 toc02 temperature ( c) timeout period (ms) v cc = +5v v cc = +2.5v 1.010 1.005 1.000 0.995 0.990 -40 50 -10 20 80 110 normalized reset threshold vs. temperature (v cc falling) mxd1810-13/15-18 toc03 temperature ( c) normalized reset threshold v th = +4.62v v th = +2.18v 0 1.0 0.5 2.0 1.5 2.5 3.0 -40 20 50 -10 80 110 power-down reset delay vs. temperature mxd1810-13/15-18 toc04 temperature ( c) power-down reset delay ( s) v th = +4.62v v th = +2.18v 100 0 10 100 1000 maximum transient duration vs. reset threshold overdrive 20 10 mxd1810-13/15 toc05 reset threshold overdrive, v th - v cc (mv) maximum transient duration ( s) 40 30 60 70 50 80 90 reset occurs above this line 0 40 120 80 160 200 06 3 9 12 15 output voltage vs. output sink current mxd1810-13/15-18 toc06 output current (ma) output voltage (mv) typical operating characteristics (t a = +25c, unless otherwise noted.)
mxd1810Cmxd1813/mxd1815Cmxd1818 low-power p reset circuits in 3-pin sc70/sot23 4 _______________________________________________________________________________________ 0 0.1 0.3 0.2 0.4 0.5 0 1.0 0.5 1.5 2.5 3.0 output voltage vs. output source current mxd1810-13/15-18 toc07 output current (ma) v cc - v out (v) 2.0 0.2 0.6 0.4 0.8 input low voltage vs. v cc and temperature mxd1810-13/15 toc08 temperature ( c) input low voltage (v) -40 20 -10 50 80 110 v cc = +5.5v v cc = +2.2v typical operating characteristics (continued) (t a = +25c, unless otherwise noted.) pin sc70 sot23 name function 21 reset push-pull, active-low reset output. reset changes from high to low when v cc drops below the selected reset threshold. reset remains low for the reset timeout period after v cc exceeds the device reset threshold. 12v cc supply voltage and input for reset threshold monitor 3 3 gnd ground mxd1810/mxd1815 pin sc70 sot23 name function 21 reset open-drain, active-low reset output. reset changes from high to low when v cc drops below the selected reset threshold. reset remains low for the reset timeout period after v cc exceeds the device reset threshold. reset has an internal 5.5k pullup resistor. 12 v cc supply voltage and input for reset threshold monitor 33 gnd ground mxd1811/mxd1816 pin descriptions
detailed description reset /reset output a microprocessors (ps) reset input starts the micro- processor in a known state. the mxd1810Cmxd1813/ mxd1815Cmxd1818 p supervisory circuits assert reset to prevent code-execution errors during power- up, power-down, and brownout conditions (figure 4). whenever v cc falls below the reset threshold, the reset output asserts. once v cc exceeds the reset threshold, an internal timer keeps the reset output asserted for the specified reset timeout period (t rp ). reset is also trig- gered by an externally initiated rising edge on the reset pin (mxd1813/mxd1818), following a low signal of 1.5s minimum duration. push-button reset (mxd1813/mxd1818) many p-based products require push-button reset capability (figure 5), allowing the operator, a test tech- nician, or external logic circuitry to initiate reset. on the mxd1813/mxd1818, a logic-low on reset held for greater than 1.5s asserts a reset. reset deasserts following a 100ms minimum reset timeout delay (t pbrst ). a manual reset input shorter than 1.5s may release reset without the 100ms minimum reset time- out delay. to facilitate use with mechanical switches, the mxd1813/mxd1818 contain internal debouncing circuitry. a debounced waveform is shown in figure 6. applications information interfacing to ps with bidirectional reset pins since the reset output on the mxd1811/mxd1816 is open drain, these devices interface easily with ps that have bidirectional reset pins, such as the motorola 68hc11. connecting the p supervisors reset output directly to the microcontrollers (cs) reset pin allows either device to assert reset (figure 7). no external pullup resistor is required, as it is contained within the mxd1811/mxd1816. negative-going v cc transients in addition to issuing a reset to the p during power-up, power-down, and brownout conditions, these devices are relatively immune to short-duration, negative-going v cc transients (glitches). mxd1810Cmxd1813/mxd1815Cmxd1818 low-power p reset circuits in 3-pin sc70/sot23 _______________________________________________________________________________________ 5 pin sc70 sot23 name function 21 reset push-pull, active-high reset output. reset changes from low to high when v cc drops below the selected reset threshold. reset remains high for the reset timeout period after v cc exceeds the device reset threshold. 12 v cc supply voltage and input for reset threshold monitor 33 gnd ground mxd1812/mxd1817 pin sc70 sot23 name function 21 reset open-drain, active-low reset output with manual reset detect. reset changes from high to low when v cc drops below the selected reset threshold, or reset is externally pulled low for at least 1.5s. reset remains low for the reset timeout period after v cc exceeds the device reset threshold or after the external manual reset is released. reset has an internal 5.5k pullup resistor. 12 v cc supply voltage and input for reset threshold monitor 33 gnd ground mxd1813/mxd1818 pin descriptions (continued)
mxd1810Cmxd1813/mxd1815Cmxd1818 the typical operating characteristics show the maximum transient duration vs. reset threshold overdrive for which reset pulses are not generated. the graph shows the maximum pulse width that a negative- going v cc transient may typically have without issuing a reset signal. as the amplitude of the transient increases, the maximum allowable pulse width decreases. ensuring a valid reset output down to v cc = 0 when v cc falls below the minimum operating voltage, push-pull structured reset sinking (or sourcing) capabil- ities decrease dramatically. high-impedance cmos- logic inputs connected to the reset/ reset pin can drift to indeterminate voltages. this does not present a problem in most cases, since most ps and circuitry do not operate at v cc below +1v. for mxd1810/ mxd1815 applications where reset must be valid down to v cc = 0, adding a pulldown resistor between reset and gnd removes stray leakage currents, hold- ing reset low (figure 8). the pulldown resistor value is not critical; 100k is large enough not to load reset and small enough to pull reset low. for mxd1812/ low-power p reset circuits in 3-pin sc70/sot23 6 _______________________________________________________________________________________ reset generator v ref v cc reset or reset mxd1810 mxd1812 mxd1815 mxd1817 figure 1. functional diagram, push-pull output reset generator v ref v cc reset mxd1811 mxd1816 figure 2. functional diagram, open-drain active-low output mr monitor v ref v cc reset mxd1813 mxd1818 reset generator figure 3. functional diagram, open-drain active-low output with manual reset detection functional diagram
mxd1817 applications where reset must be valid to v cc = 0, a 100k pullup resistor between reset and v cc holds reset high when v cc falls below the mini- mum operating voltage (figure 9). the mxd1811/mxd1813/mxd1816/mxd1818 have open-drain, active-low outputs with a pullup resistor included internal to the devices. while using these devices reset will most likely not maintain an active condition when the supply voltage drops below the minimum v cc , but will drift to a nonactive level due to the pullup resistor and the reduced sinking capability of the open-drain output. therefore, these devices are not recommended for applications where the reset pin is required to be valid at v cc = 0. mxd1810Cmxd1813/mxd1815Cmxd1818 low-power p reset circuits in 3-pin sc70/sot23 _______________________________________________________________________________________ 7 v th v cc t rp v cc(min) t rp reset reset figure 4. power-up reset timing diagram mxd1813 mxd1818 v cc reset reset manual reset v cc gnd figure 5. push-button manual reset (open) v cc external push button reset (open) (closed) t pbrst t pbrst switch bounce figure 6. manual reset timing diagram
mxd1810Cmxd1813/mxd1815Cmxd1818 low-power p reset circuits in 3-pin sc70/sot23 8 _______________________________________________________________________________________ mxd1811 mxd1816 gnd gnd v cc v cc v cc p reset reset figure 7. interfacing to microprocessors with bidirectional reset pins mxd1810 mxd1815 gnd *mxd1810/mxd1815 only gnd v cc v cc v cc p reset reset r pulldown * figure 8. ensuring valid reset output down to v cc = 0 (mxd1810/mxd1815 only) mxd1812 mxd1817 gnd *mxd1812/mxd1817 only gnd v cc v cc v cc p reset reset r pullup * figure 9. ensuring valid reset output down to v cc = 0 (mxd1812/mxd1817 only) top mark part sot23 sc70 mxd1810 _r46 fziv aek mxd1810_r44 fzkd ahu mxd1810_r41 fzkc aht mxd1811 _r46 fzkf ahw mxd1811_r44 fziw ael mxd1811_r41 fzke ahv mxd1812 _r46 fzkh ahy mxd1812_r44 fzkg ahx mxd1812_r41 fzix aem mxd1813 _r46 fziy aen mxd1813_r44 fzkj aia mxd1813_r41 fzki ahz mxd1815 _r31 fzkn aie mxd1815_r29 fziz aeo mxd1815_r26 fzkm aid mxd1815_r23 fzkl aic mxd1815_r22 fzkk aib mxd1816 _r31 fzkr aii mxd1816_r29 fzkq aih mxd1816_r26 fzkp aig mxd1816_r23 fzko aif mxd1816_r22 fzja aep mxd1817 _r31 fzjb aeq mxd1817_r29 fzkv aim mxd1817_r26 fzku ail mxd1817_r23 fzkt aik mxd1817_r22 fzks aij mxd1818 _r31 fzky aip mxd1818_r29 fzkx aio mxd1818_r26 fzjc aer mxd1818_r23 fzkw ain mxd1818_r22 fzje aev table 1 . dev i ce mark i ng code s
mxd1810Cmxd1813/mxd1815Cmxd1818 low-power p reset circuits in 3-pin sc70/sot23 _______________________________________________________________________________________ 9 selector guide part 5v systems 2 . 5v/3 . 0v/3 . 3v systems push-pull reset open-drain reset push-pull reset open-drain reset with push- button detect mxd1810 ? ? mxd1811 ? ? mxd1812 ? ? mxd1813 ? ? mxd1815 ? ? mxd1816 ? ? mxd1817 ? ? mxd1818 ? ? ordering information (continued) part temp range pin-package mxd1811 ur_ _-t -40 o c to +105 o c 3 sot23-3 mxd1811xr_ _-t -40 o c to +105 o c 3 sc70-3 mxd1812 ur_ _-t -40 o c to +105 o c 3 sot23-3 mxd1812xr_ _-t -40 o c to +105 o c 3 sc70-3 mxd1813 ur_ _-t -40 o c to +105 o c 3 sot23-3 mxd1813xr_ _-t -40 o c to +105 o c 3 sc70-3 mxd1815 ur_ _-t -40 o c to +105 o c 3 sot23-3 mxd1815xr_ _-t -40 o c to +105 o c 3 sc70-3 mxd1816 ur_ _-t -40 o c to +105 o c 3 sot23-3 mxd1816xr_ _-t -40 o c to +105 o c 3 sc70-3 mxd1817 ur_ _-t -40 o c to +105 o c 3 sot23-3 mxd1817xr_ _-t -40 o c to +105 o c 3 sc70-3 mxd1818 ur_ _-t -40 o c to +105 o c 3 sot23-3 mxd1818xr_ _-t -40 o c to +105 o c 3 sc70-3 reset threshold table part suffix (_ _) typ . reset threshold (v) * mxd1810Cmxd1813 46 4.62 mxd1810Cmxd1813 44 4.37 mxd1810Cmxd1813 41 4.12 mxd1815Cmxd1818 31 3.06 mxd1815Cmxd1818 29 2.88 mxd1815Cmxd1818 26 2.55 mxd1815Cmxd1818 23 2.31 mxd1815Cmxd1818 22 2.18 * factory-trimmed reset thresholds are nominally 1.5% at room temperature. chip information transistor count: 709 process technology: bicmos ? the mxd1810Cmxd1813/mxd1815Cmxd1818 are available with factory-set v cc reset thresholds from +2.18v to +3.06v (mxd1815Cmxd1818) and +4.12v to +4.62v (mxd1810C mxd1813). choose the desired reset-threshold suffix from the reset threshold table and insert it in place of the _ _ follow- ing r in the part number. all devices are available in tape- and-reel only in 2500 unit increments. other threshold voltages may be available. contact factory for availability. devices are available in both leaded and lead-free packaging. specify lead-free by replacing -t with +t when ordering. ?
mxd1810Cmxd1813/mxd1815Cmxd1818 low-power p reset circuits in 3-pin sc70/sot23 10 ______________________________________________________________________________________ sc70, 3l.eps package infor mation (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 .)
mxd1810Cmxd1813/mxd1815Cmxd1818 low-power p reset circuits in 3-pin sc70/sot23 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. maxim integrated products, 120 san gabriel drive, sunnyvale, ca 94086 408-737-7600 ____________________ 11 ? 200 5 maxim integrated products is a registered trademark of maxim integrated products , inc . sotpo3l.eps package infor mation (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 .) revision history pages changed at rev 1: 1, 9, 10, 11

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