computers controllers intelligent instruments critical p and c power monitoring portable/battery- powered equipment general description the max6711/max6712/max6713 are microprocessor (p) supervisory circuits used to monitor the power supplies in p and digital systems. they provide excellent circuit reliability and low cost by eliminating exter- nal components and adjustments when used with +5.0v, +3.3v, +3.0v, or +2.5v-powered circuits. they also provide a debounced manual reset input. these circuits assert a reset signal whenever the v cc supply voltage declines below a preset threshold or whenever manual reset is asserted. reset remains asserted for at least 140ms after v cc has risen above the reset threshold or when manual reset is deasserted. reset thresholds suitable for operation with a variety of supply voltages are available. the max6713 has an open-drain output stage, while the max6711/max6712 have push-pull outputs. the max6713s open-drain reset output requires a pull-up resistor that can be connected to a voltage higher than v cc . the max6711/max6713 have an active-low reset output, while the max6712 has an active-high reset out- put. the reset comparator is designed to ignore fast transients on v cc , and the outputs are guaranteed to be in the correct logic state for v cc down to 1v. low supply current makes the max6711/max6712/ max6713 ideal for use in portable equipment. these devices are available in a 4-pin sc70 package. applications features precision monitoring of 2.5v, 3.0v, 3.3v, and 5.0v power-supply voltages fully specified over temperature available in three output configurations push-pull reset output (max6711) push-pull reset output (max6712) open-drain reset output (max6713) 140ms min power-on-reset pulse width manual reset input 12a supply current guaranteed reset valid to v cc = +1v power-supply transient immunity no external components 4-pin sc70 package note: these parts are offered in 2.5k or 10k reels and must be ordered in 2.5k or 10k increments. order max6711_exs-t for 2.5k reels and max6711_exs-t10 for 10k reels. insert the desired suffix letter from the selector guide into the blank to complete the part number. devices are available in both leaded and lead-free packaging. specify lead-free by replacing -t with +t when ordering. part temp range pin-package max6711_exs-t -40c to +125c 4 sc70 max6711 _ exs-t10 -40c to +125c 4 sc70 max6712_ exs-t -40c to +125c 4 sc70 max6712 _ exs-t10 -40c to +125c 4 sc70 max6713_ exs-t -40c to +125c 4 sc70 max6713 _ exs-t10 -40c to +125c 4 sc70 top view reset (reset) 1 gnd v cc max6711max6712 max6713 sc70-4 2 4 mr 3 ( ) are for max6712. max6711max6713 v cc v cc r pull-up * reset resetinput gnd mr v cc gnd *max6713 only pushbuttonswitch p max6711l/m/r/s/t/z, max6712l/m/r/s/t/z, max6713l/m/r/s/t/z 4-pin sc70 microprocessor reset circuits with manual reset input 19-1623; rev 2; 5/14 pin coniguration typical operating circuit selector guide appears at end of data sheet. ordering information downloaded from: http:///
terminal voltage (with respect to gnd) v cc ....................................................................... -0.3v to +6.0v reset, reset (push-pull) ...................... -0.3v to (v cc + 0.3v) reset (open drain) ............................................. -0.3v to +6.0v mr ............................................................ -0.3v to (v cc + 0.3v) input current, v cc , mr ...................................................... 20ma output current, reset, reset ........................................ 20ma rate of rise, v cc .......................................................... 100v/s continuous power dissipation (t a = +70c) 4-pin sc70 (derate 3.1mw/c above +70c) ............. 245mw operating temperature range ......................... -40c to +125c storage temperature range ............................ -65c to +150c lead temperature (soldering, 10s) ................................. +300c (v cc = full range, t a = -40c to +125c, unless otherwise noted. typical values are at v cc = +5v for l/m versions, v cc = +3.3v for t/s versions, v cc = +3v for r version, v cc = +2.5v for z version, and t a = +25c.) (note 1) parameter symbol conditions min typ max units v cc range t a = 0c to +70c 1.0 5.5 v t a = -40c to +105c 1.2 5.5 supply current i cc t a = -40c to +85c v cc < 5.5v, max671_l/m 16 35 a v cc < 3.6v, max671_r/s/t/z 12 30 t a = +85c to +105c v cc < 5.5v, max671_l/m 75 v cc < 3.6v, max671_r/s/t/z 75 reset threshold v th max671_l t a = +25c 4.56 4.63 4.70 v t a = -40c to +85c 4.50 4.75 t a = +85c to +105c 4.40 4.86 max671_m t a = +25c 4.31 4.38 4.45 t a = -40c to +85c 4.25 4.50 t a = +85c to +105c 4.16 4.56 max671_t t a = +25c 3.04 3.08 3.11 t a = -40c to +85c 3.00 3.15 t a = +85c to +105c 2.92 3.23 max671_s t a = +25c 2.89 2.93 2.96 t a = -40c to +85c 2.85 3.00 t a = +85c to +105c 2.78 3.08 max671_r t a = +25c t a = -40c to +85c t a = +85c to +105c 2.59 2.63 2.66 2.55 2.70 2.50 2.76 max671_z t a = +25c 2.28 2.32 2.35 t a = -40c to +85c 2.25 2.38 t a = +85c to +105c 2.21 2.45 reset-threshold tempco 30 ppm/c v cc to reset delay (note 2) v cc = v th to (v th - 100 mv) 20 s reset active timeout period t a = -40c to +85c 140 240 460 ms t a = +85c to +125c 100 840 www.maximintegrated.com maxim integrated 2 max6711l/m/r/s/t/z, max6712l/m/r/s/t/z, max6713l/m/r/s/t/z 4-pin sc70 microprocessor reset circuits with manual reset input electrical characteristics stresses beyond those listed under absolute 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. absolute maximum ratings downloaded from: http:///
note 1: production testing done at t a = +25c; limits over temperature guaranteed by design only. note 2: reset output for max6711/max6713; reset output for max6712. (v cc = full range, t a = -40c to +125c, unless otherwise noted. typical values are at v cc = +5v for l/m versions, v cc = +3.3v for t/s versions, v cc = +3v for r version, v cc = +2.5v for z version, and t a = +25c.) (note 1) parameter symbol conditions min typ max units reset output-voltage low (max6711/max6713) v ol v cc = v th min, i sink = 1.2ma, max6711r/s/t/z, max6713r/s/t/z 0.3 v v cc = v th min, i sink = 3.2ma, max6711l/m, max6713l/m 0.4 v cc > 1.0v, i sink = 50a 0.3 reset output-voltage high (max6711) v oh v cc > v th max, i source = 500a, max6711r/s/t/z 0.8 x v cc v v cc > v th max, i source = 800a, max6711l/m v cc x 1.5 reset output-voltage low (max6712) v ol v cc = v th max, i sink = 1.2ma, max6712r/s/t/z 0.3 v v cc = v th max, i sink = 3.2ma, max6712l/m 0.4 reset output-voltage high (max6712) v oh 1.8v < v cc < v th min, i source = 150a 0.8 x v cc v reset open-drain output-leakage current v cc > v th , reset deasserted 1 a mr input threshold v il 0.3 x v cc v v ih 0.7 x v cc mr pull-up resistance 10 20 k w mr minimum pulse width 1 s mr glitch immunity 100 ns mr to reset delay 200 ns www.maximintegrated.com maxim integrated 3 max6711l/m/r/s/t/z, max6712l/m/r/s/t/z, max6713l/m/r/s/t/z 4-pin sc70 microprocessor reset circuits with manual reset input electrical characteristics (continued) downloaded from: http:///
(v cc = full range, t a = -40c to +125c, unless otherwise noted. typical values are at v cc = +5v for l/m versions, v cc = +3.3v for t/s versions, v cc = +3v for r version, v cc = +2.5v for z version, and t a = +25c.) 0.998 reset threshold vs. temperature 1.001 max6711/12/13-toc5 temperature (c) reset threshold (v) 1.0000.999 -40 80 100 120 20 -20 0 60 40 v th = 4.63v 200 power-up reset timeout vs. temperature 300 max6711/12/13-toc4 temperature (c) power-up reset timeout (ms) 250225 275 -40 80 100 120 20 -20 0 60 40 max671_ l/m max671_ r/s/t/z 0 max671_l/m power-down reset delay vs. temperature 120 150 180 max6711/12/13-toc3 temperature (c) power-down reset delay ( s) 6030 90 -40 80 100 120 20 -20 0 60 40 v od = 10mv v od = 20mv v od = 200mv v od = 100mv 0 max671_r/s/t/z power-down reset delay vs. temperature 80 max6711/12/13-toc2 temperature (c) power-down reset delay ( s) 4020 60 -40 80 100 120 20 -20 0 60 40 v od = 10mv v od = 20mv v od = 200mv v od = 100mv -40 20 40 -20 0 60 80 100 120 supply current vs. temperature (no load) max6711/12/13 toc01 temperature (c) supply current ( a) 0 5 10 15 max671 _z, v cc = 2.5v max671_l/m, v cc = 5v max671 _l/m/r/s/t/z, v cc = 1v max671 _r/s/t, v cc = 3.3v maxim integrated 4 www.maximintegrated.com max6711l/m/r/s/t/z, max6712l/m/r/s/t/z, max6713l/m/r/s/t/z 4-pin sc70 microprocessor reset circuits with manual reset input typical operating characteristics downloaded from: http:///
least 140ms after v cc has risen above the reset thresh - old. the max6713 uses an open-drain output, and the max6711/max6712 have a push-pull output stage. connect a pull-up resistor on the max6713's reset output to any supply between 0 and 6v. manual reset input many p-based systems require manual reset capabili- ty, allowing the operator, a test technician, or external logic circuitry to initiate a reset. reset remains asserted while mr is low, and for at least 140ms after mr returns high. this input has an internal 20k w pullup resistor, so it can be left open if it is not used. mr can be driven with ttl- or cmos-logic levels, or with open-drain/col- lector outputs. to create a manual reset function, con- nect a normally open momentary switch from mr to ground; 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 0.1f capacitor from mr to ground provides additional noise immunity. applications information negative-going v cc transients in addition to issuing a reset to the p during power-up, power-down, and brownout conditions, the max6711/ max6712/max6713 are relatively immune to short-dura - tion negative-going v cc transients (glitches). figure 1 shows typical transient duration vs. reset com - parator overdrive, for which the max6711/max6712/ max6713 do not generate a reset pulse. the graph was generated using a negative-going pulse applied to v cc , starting 0.5v above the actual reset threshold and end- ing below it by the magnitude indicated (reset compar - ator overdrive). the graph indicates the maximum pulse width a negative-going v cc transient can have without causing a reset pulse. as the magnitude of the transient increases (goes farther below the reset threshold), the detailed description reset output a microprocessor's (p's) reset input starts the p in a known state. the max6711/max6712/max6713 assert reset to prevent code-execution errors during power- up, power-down, or brownout conditions. they assert a reset signal whenever the v cc supply voltage declines below a preset threshold, keeping it asserted for at figure 2. reset valid to v cc = ground circuit figure 1. maximum transient duration without causing a reset pulse vs. reset comparator overdrive pin name function 1 gnd ground 2 reset (max6711/ max6713) reset output remains low while v cc is below the reset threshold, and for at least 140ms after v cc rises above the reset threshold. reset (max6712) reset output remains high while v cc is below the reset threshold, and for at least 140ms after v cc rises above the reset threshold. 3 mr manual reset input. reset ( reset ) remains asserted as long as mr is low, and for at least 140ms after mr is deasserted. this active-low input has an internal 20k w ?(typ) pull-up resistor. it can be driven from a ttl- or cmos- logic line, or shorted to ground with a switch. leave open or connect to v cc if unused. 4 v cc supply voltage (+5.0v, +3.3v, +3.0v, or +2.5v) r1100k v cc gnd mr max6711 reset 400 320 0 1 100 1000 160 80 240 reset comparator overdrive, v th - v cc (mv) maximum transient duration ( s) 10 t a = +25c max671_l/m max671_r/s/t/z www.maximintegrated.com maxim integrated 5 max6711l/m/r/s/t/z, max6712l/m/r/s/t/z, max6713l/m/r/s/t/z 4-pin sc70 microprocessor reset circuits with manual reset input pin description downloaded from: http:///
maximum allowable pulse width decreases. typically, for the max671_l and max671_m, a v cc transient that goes 100mv below the reset threshold and lasts 20s or less will not cause a reset pulse. a 0.1f bypass capaci - tor mounted as close as possible to the v cc pin provides additional transient immunity. ensuring a valid reset output down to v cc = 0 when v cc falls below 1v, the max6711 reset output no longer sinks currentit becomes an open circuit. therefore, high-impedance cmos-logic inputs connect - ed to reset can drift to undetermined voltages. this presents no problem in most applications since most p and other circuitry is inoperative with v cc below 1v. however, in applications where reset must be valid down to 0, adding a pull-down resistor to reset caus - es any stray leakage currents to flow to ground, holding reset low (figure 2). r1's value is not critical; 100k w is large enough not to load reset and small enough to pull reset to ground. a 100k w pull-up resistor to v cc is also recommended for the max6712 if reset is required to remain valid for v cc < 1v.66 interfacing to ps with bidirectional reset pins since the reset output on the max6713 is open- drain, this device interfaces easily with ps that have bidirectional reset pins, such as the motorola 68hc11. connecting the p supervisor's reset output directly to the p's reset pin with a single pull-up resistor allows either device to assert reset (figure 3). max6713 open-drain reset output allows use with multiple supplies generally, the pull-up connected to the max6713 will connect to the supply voltage that is being monitored at the ic's 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 4). note that as the max6713's v cc decreases below 1v, so does the ic's ability to sink current at reset . also, with any pullup, reset will be pulled high as v cc decays toward 0. the voltage where this occurs depends on the pull-up resistor value and the voltage to which it is connected. beneits of highly accurate reset threshold most p supervisor ics have reset threshold voltages between 5% and 10% below the value of nominal supply voltages. this ensures a reset will not occur within 5% of the nominal supply, but will occur when the supply is 10% below nominal. when using ics rated at only the nominal supply 5%, a zone of uncertainty where the supply is between 5% and 10% low, and where the reset may or may not be asserted is left. the max671_l/t/z use highly accurate circuitry to ensure that reset is asserted close to the 5% limit, and long before the supply has declined to 10% below nominal. figure 4. max6713 open-drain reset output allows use with multiple supplies figure 3. interfacing to ps with bidirectional reset i/o reset gnd resetinput r pullup max6713 5v system gnd v cc +3.3v +5.0v v cc reset gnd mr resetinput max6713 motorola 68hcxx p gnd v cc v cc v cc www.maximintegrated.com maxim integrated 6 max6711l/m/r/s/t/z, max6712l/m/r/s/t/z, max6713l/m/r/s/t/z 4-pin sc70 microprocessor reset circuits with manual reset input chip information transistor count: 380 downloaded from: http:///
part/suffix reset threshold (v) output type top mark max6711 l 4.63 push-pull reset aab max6711m 4.38 push-pull reset aac max6711t 3.08 push-pull reset aad max6711s 2.93 push-pull reset aae max6711r 2.63 push-pull reset aaf max6711z 2.32 push-pull reset aag max6712 l 4.63 push-pull reset aah max6712m 4.38 push-pull reset aai max6712t 3.08 push-pull reset aaj max6712s 2.93 push-pull reset aak max6712r 2.63 push-pull reset aal max6712z 2.32 push-pull reset aam max6713 l 4.63 open-drain reset aan max6713m 4.38 open-drain reset aao max6713t 3.08 open-drain reset aap max6713s 2.93 open-drain reset aaq max6713r 2.63 open-drain reset aar max6713z 2.32 open-drain reset aas package type package code outline no. land pattern no. 4 sc70 x4-1 21-0098 90-0187 www.maximintegrated.com maxim integrated 7 max6711l/m/r/s/t/z, max6712l/m/r/s/t/z, max6713l/m/r/s/t/z 4-pin sc70 microprocessor reset circuits with manual reset input selector guide package information for the latest package outline information and land patterns (footprints), go to www.maximintegrated.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. downloaded from: http:///
revision number revision date description pages changed 2 5/14 no /v opns; removed automotive reference from applications section 1 maxim integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a maxim integrated product. no circuit patent licenses are implied. maxim integrated reserves the right to change the circuitry and speciications without n otice 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 guidance. maxim integrated and the maxim integrated logo are trademarks of maxim integrated products, inc. ? 2014 maxim integrated products, inc. 8 max6711l/m/r/s/t/z, max6712l/m/r/s/t/z, max6713l/m/r/s/t/z 4-pin sc70 microprocessor reset circuits with manual reset input revision history for pricing, delivery, and ordering information, please contact maxim direct at 1-888-629-4642, or visit maxim integrateds website at www.maximintegrated.com. downloaded from: http:///
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