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mic2782 dual - input push button reset ic with immedia te and delayed outputs . micrel inc. ? 2180 fortune drive ? san jose, ca 95131 ? usa ? tel +1 (408) 944 - 0800 ? fax + 1 (408) 474 - 1000 ? http://www.micrel.com february 21, 2014 revision 2.0 general description the mic2782 is a two input, two output push - button reset ic. it will generate a reset pulse for a factory - programmed r eset t imeout p eriod after both manual reset inputs have been held to a logic - low for the f actory - programmed s etup pe riod . th e mic2782 also has an andout logic output which will activate if both inputs are held low for longer than a d ebounce t ime (1 .5 ms) , and deactivate if one or both inputs are released for longer than a d ebounce t ime (1 .5 ms) . the reset and andout outputs are active - low, open - drain nmos outputs . the mic2782 operates over the 1.5v to 5.5v supply voltage range, consuming 2 .2 a of supply current at 3 .3 v. the device features 65k ? internal pull - up resistor s on bot h of the inputs (/mr1 and /mr2). the device o ffers factory programmed s etup p eriods of 6s, 8s , 10 s , or 12 s and r eset t imeout p eriods of 0.5 s, 1s or 2s . it is available in a space saving, 6 - bump, 0.4mm pitch, 0.8mm 1.2mm wafer level chip scale package . data sheets and support documentation can be found on micrels web site at: www.micrel.com . features ? 1.5v to 5.5v operating supply voltage range ? 2.2 a supply current with /mr1, /mr2 not asserted ? factory - programmed s etup p eriod s of 6s, 8s , 10 s or 12 s ? factory - programmed r eset t imeout p eriod s of 0.5s, 1s or 2s ? integrated 65k ? /mr1 and /mr2 pull - up resistors ? supports single push - button reset with /mr1 tied to /mr2 ? reset asserts after /mr1 and /mr2 are asserted low for a s etup p eriod ? andout asserts after /mr1 and /mr2 are asserted low for a d ebounce t ime (1 .5 ms) ? open - drain reset and andout outputs ? 6-b ump, 0.4mm pitch, 0.8mm 1.2mm wafer level chip scale p ackage ( wl csp) applications ? smart phones ? tablets ? ebooks ? portable games ? portable navigation device ____________________________________________________________________________________________________________________ typical application /mr2 /mr1 push-button switch push-button switch 100k v dd = 1.5v to 5.5v load switch or pmic or p /reset /mr2 /mr1 andout 0.1uf gnd vdd 100k reset mic2782 load switch or pmic or p /reset downloaded from: http:///
micre l, inc. mic2782 february 21, 2014 2 revision 2.0 ordering information part number part marking setup period (t setup ) ( s) reset timeout period (t reset ) ( s) package mic2782c lycs uja 6 0.5 6- bump, 0.4mm pitch, 0.8mm 1.2mm wlcsp mic2782cmycs (1 ) - 6 1 6- bump, 0.4mm pitch, 0.8mm 1.2mm wl csp mic2782cr ycs ujc 6 2 6- bump, 0.4mm pitch, 0.8mm 1.2mm wlcsp mic2782d lycs uku 8 0.5 6- bump, 0.4mm pitch, 0.8mm 1.2mm wlcsp mic2782dm ycs (1 ) - 8 1 6- bump, 0.4mm pitch, 0.8mm 1.2mm wlcsp mic2782dr ycs uje 8 2 6- bump, 0.4mm pitch, 0.8mm 1.2mm wlc sp mic2782e lycs ukw 10 0.5 6- bump, 0.4mm pitch, 0.8mm 1.2mm wlcsp mic2782em ycs ukx 10 1 6- bump, 0.4mm pitch, 0.8mm 1.2mm wlcsp mic2782er ycs (1 ) - 10 2 6- bump, 0.4mm pitch, 0.8mm 1.2mm wlcsp mic2782f lycs ujf 12 0.5 6- bump, 0.4mm pitch, 0.8mm 1.2m m wlcsp mic2782fm ycs (1 ) - 12 1 6- bump, 0.4mm pitch, 0.8mm 1.2mm wlcsp mic2782fr ycs ukz 12 2 6- bump, 0.4mm pitch, 0.8mm 1.2mm wlcsp notes: 1. contact factory for availability . ordering guide downloaded from: http:///
micrel, inc. mic2782 february 21, 2014 3 revision 2.0 chip scale package (cs) bump configuration y = year code ww = week code top view top view (bump side down) bottom view (bump side up) 6- bump, 0.4mm pitch, 0.8mm x 1.2mm wl csp pin description bump designation bump name pin function a1 andout nmos open - drain output, active - low . asserts l ow 1 .5 ms after /mr1 and /mr2 are both asserted low. connect a resistor greater than 5k ? from the andout pin to vdd in order to pull up the andout output voltage when inactive. no esd diode from andout to vdd. please see the functional description and timing diagram sections for further details of how the an dout output functions. a2 /mr2 ma nual reset input 2, active - low. internal 65k ? (typical) pull - up resistor to vdd. pulling both manual reset inputs low for longer than the setup period causes one reset output pulse for the reset timeout delay period. b1 reset nmo s open - drain output, activ e- low . asserts low after /mr1 and /mr2 have both asserted low for longer than s etup p eriod. connect a resistor greater than 5k ? from the reset pin to vdd in order to pull up the reset output voltage when inactive. no esd diode from reset to vdd. please see the functional description and timing diagram sections for further details of how the reset output functions. b2 /mr1 manual reset input 1, active - low. internal 65k ? (typical) pull - up resistor to vdd. pulling both manual reset inputs low for longer than t he setup period causes one reset output pulse for the reset timeout delay period. c1 vdd supply voltage. bypass to ground with minimum 0. 1f capacitor. c2 gnd supply ground. downloaded from: http:///
micrel, inc. mic2782 february 21, 2014 4 revision 2.0 absolute maximum ratings (1) supply voltage (v dd ) ...................................... gnd to +6.0v input voltage (v /mr1 , v /mr2 ) gnd - 0.3v to v dd + 0.3v nmos output voltage (v reset, v andout ) .... gnd - 0.3v to +6.0v lead temperature (soldering, 10sec.) ....................... 260c storage temperature (t s) .......................... - 55c to +150c esd rating (human body model) (3) .............................. 2kv esd rating (machine model) ...200v operating ratings (2) supply voltage (v dd ) .................................... +1.5v to +5.5v input voltage (v /mr1 , v /mr2 ) ... .0 v to v dd nmos output voltage (v reset, v andout ) .0v to +5.5 v junction temperature (t j ) .......................... C 40c to +85c package thermal resistance 6- bump, 0.4mm pitch wlcsp ( ja ) ................ 125 c/w electrical characteristics ( 4) for typical values, v dd = 3.3 v, /mr1 = /mr2 = open, t j = 25c, b old values indicate C 40c t j +8 5c; unless noted. parameter condition s min . typ . max . units power supply input supply voltage (v dd ) reset output valid 1.5 5.5 v supply current ( i dd ) v dd = 3.3v, /mr1 = /mr2 = vdd 2.2 4.0 a v dd = 5.0v, /mr1 = /mr2 = vdd 3.2 5.0 v dd = 3.3v, /mr1 = /mr2 = gnd 120 reset time setup period (t setup ) ordering option: c 5.4 6 6.6 s ordering option: d 7 .2 8 8.8 ordering option: e 9.0 10 11 ordering option: f 10.8 12 13.2 reset timeout period (t reset ) ordering option: l 0.4 0.5 0.6 s ordering option: m 0.9 1 1.1 ordering option: r 1.8 2 2.2 andout debounce t ime (t db ) v / mr1,2 < (v il C 100mv) 1 1.5 2 ms output low voltage (v ol ) v dd = 4.5v, i sink = 1.6ma 0.3 v v dd = 3.3v, i sink = 1.2ma 0.3 v dd = 1.5v, i sink = 0.5ma 0.3 open - drain leakage current (i leakage ) reset, andout inactive v reset , v andout = 5.5v 3 00 na /mr1, /mr2 input input high voltage (v ih ) 1.2 v input low voltage (v il ) 0.4 v internal pull - up resistance (r pu ) for /mr1, /mr2 55 65 75 k notes: 1. exceeding the absolute maximum rating may damage the device. 2. the device is not guaranteed to function outside its operating rating. 3. devices are esd sensitive. handling precautions recommended. human body model, 1.5k in series with 100p f. 4. specification for packaged product only . downloaded from: http:///
micrel, inc. mic2782 february 21, 2014 5 revision 2.0 typical characteristics v dd supply current vs. temperature 1.4 1.8 2.2 2.6 3.0 3.4 -40 -15 10 35 60 85 temperature (c) supply current (a) v dd = 3.3v /mr1 = not asserted /mr2 = not asserted v dd supply current vs. supply voltage 1.2 2.0 2.8 3.6 4.4 0 1 2 3 4 5 6 supply voltage (v) supply current (a) t a = 25c /mr1 = not asserted /mr2 = not asserted supply current for /mr1 and /mr2 inputs low vs. temperature 118 119 120 121 122 -40 -15 10 35 60 85 temperature (c) supply current (a) v dd = 3.3v /mr1 = /mr2 = gnd supply current for /mr1 and /mr2 inputs low vs. supply voltage 40 100 160 220 280 0 1 2 3 4 5 6 supply voltage (v) supply current (a) ta = 25c /mr1 = /mr2 = gnd setup period vs. temperature 9.8 10.0 10.2 10.4 10.6 -40 -15 10 35 60 85 temperature (c) setup period (s) v dd = 3.3v mic2782elycs setup period vs. supply voltage 9.0 9.5 10.0 10.5 11.0 0 1 2 3 4 5 6 supply voltage (v) setup period (s) t a = 25c mic2782elycs reset timeout period vs. temperature 0.40 0.45 0.50 0.55 0.60 -40 -15 10 35 60 85 temperature (c) reset timeout period (s) v dd = 3.3v mic2782elycs reset timeout period vs. supply voltage 0.40 0.45 0.50 0.55 0.60 0 1 2 3 4 5 6 supply voltage (v) reset timeout period (s) t a = 25c mic2782elycs downloaded from: http:///
micrel, inc. mic2782 february 21, 2014 6 revision 2.0 timing diagram vdd /mr1 /mr2 1.5v 1.5v andout t reset t setup undefined state for vdd < 1.5v undefined state for vdd < 1.5v reset t > t db t = t db t = t db downloaded from: http:///
micrel, inc. mic2782 february 21, 2014 7 revision 2.0 functional diagram downloaded from: http:///
micrel, inc. mic2782 february 21, 2014 8 revision 2.0 functional description design and product advantages the mic2782 is a dual pu sh - button input reset ic with extended setup delay times. it is used for generating a hard reset for microcontrollers, pmics or load disconnect switches. the dual manual reset inputs and long setup delay times help protect against accidental system resets. the fixed reset timeout period allows for more predictable phone or tablet operation during hardware resets. it is used in applications such as smart phones, tablets, personal navigation devices, mp3 players and set - top boxes (stb). general functional ity as shown in figure 1, if both /mr1 and /mr2 are asserted low for longer than the setup period (t setup ), the reset output will be asserted (logic - level low) for a reset timeout period (t reset ) . during the setup period, if either of the /mr1 or /mr2 inpu ts are de - asserted high, then the setup period timer will be reset. to assert the reset output low again, both the /mr1 and /mr2 inputs will have to be asserted low together for the full duration of the s etup period . if both /mr1 and /mr2 are asserted lo w for longer than the debounce t ime (t db ), the n the andout output will be asserted, (logic - level low). andout will remain asserted low as long as both the /mr1 and /mr2 inputs are asserted low. if either the /mr1 or /mr2 are de - asserted for longer that the debounce time (t db ), then the andout output will de - assert high. figure 1. manual reset function keeping both manual reset inputs low for a longer time does not generate additional reset output pulses. de - asserting either manual reset input during the reset pulse duration , will not reset the setup timer. after the reset p in has de - assert ed high , both the manual reset inputs must be held high for more than a debounce t ime to reset the setup t imer. andout debounce t ime is a de - glitch t ime, typicall y 1 .5 ms, that senses the asserting of both manual reset inputs low together. a de - glitch time is needed if the manual reset inputs come from noisy push - button sources. if either manual reset inputs are asserted (or de - asse rted) for less than a debounce t im e, the andout output will not respond. dual manual reset input s (/mr1, /mr2 ) the /mr1, /mr2 are active - low manual inputs that have integrated 65k pull - up resistors to the vdd power supply. if both inputs are asserted (logic - level low) for a setup period (t setup ), only one reset pulse, of width t reset , is generated. the behavior of the reset and andout outputs is independent of the order in which the /mr1, /mr2 inputs are driven low. the mic2782 consumes only 2 a when /mr1 and /mr2 manual inputs are de - asserted (logic - level high) together. current consumption is typically 120 a when both manual inputs are asserted low together and 55 a when only on e of the manual inputs is asserted low while the other manual input is de - asserted high. output s ( reset and andout ) the reset and andout output s are simple open - drain n - channel mosfet structures that require a pull - up resistor. for most applications, the p ull - up voltage will be the same as the power supply that supplies v dd to the mic27 82 . as shown in figure 2 , it is possible to tie this resistor to some other voltage, other than v dd , thus ena bling level - shifting of the reset or andout output s . the pull - up voltage must be limited to 5.5v to avoid damaging the mic27 82 . the pull - up resistor must be small enough to supply current to the inputs and leakage p aths that are driven by the reset or andout output s . a recommended value is 100k . since the reset and andout outputs are open - drain, several reset sources can be wire - ored, in parallel, to allow resets from multiple sources. downloaded from: http:///
micrel, inc. mic2782 february 21, 2014 9 revision 2.0 vdd 100k +3.3v reset v cc p mic2782 gnd gnd /reset +5v figure 2 . mic2782 used in multiple supply system bypass capacitor from vdd to gnd a 0.1 f input bypass capacitor must be placed from vdd (pin c1) to gnd (pin c2). downloaded from: http:///
micrel, inc. mic2782 february 21, 2014 10 revision 2.0 typical applications 100k v dd = 1.5v to 5.5v load switch or pmic or p /reset /mr2 /mr1 andout /mr gnd vdd 100k push-button switch reset mic2782 load switch or pmic or p /reset 0.1uf figure 3 . single button application for mic2782 u sed for microcontroller reset /mr2 /mr1 push-button switch push-button switch 100k v dd = 1.5v to 5.5v load switch or pmic or p /reset /mr2 /mr1 andout 0.1uf gnd vdd 100k reset mic2782 load switch or pmic or p /reset figure 4 . dual button application for mic2782 used for microcontro ller reset downloaded from: http:///
micrel, inc. mic2782 february 21, 2014 11 revision 2.0 evaluation board schematic reset mic2782 gnd /mr2 /mr1 vdd andout 0.1 f v dd 1.5v to 5.5v 100k reset andout r2 c byp u1 b2a2 c2 a1 b1 j5 j4 sw2 /mr2 j7 j6 sw1 /mr1 j3 j2 j1 v dd 100k r1 c1 push-button switch push-button switch bill of materials item part number manufacturer description qty. c1 grm188r71c104ka01d (1) murata 0. 1f, 16v capacitor, x7r, 0603 1 r1, r2 crcw0603100kjnea (2) vishay 100k, 5% resistor, 0603 2 u1 mic2782 e lycs (3) micrel, inc. dual - input push button reset ic 1 notes: 1. murata tel: www.murata.com . 2. vishay tel: www.vishay.com . 3. micrel , inc.: www.micrel.com . downloaded from: http:///
micrel, inc. mic2782 february 21, 2014 12 revision 2.0 pcb layout recommendations top silkscreen copper layer 1 (top layer) downloaded from: http:///
micrel, inc. mic2782 february 21, 2014 13 revision 2.0 pcb layout recommendations (continued) copper layer 2 (bottom layer) bottom silkscreen downloaded from: http:///
micrel, inc. mic2782 february 21, 2014 14 revision 2.0 package information 6- bump, 0.4mm pitch 0.8mm 1.2mm wlcsp (cs) downloaded from: http:///
micrel, inc. mic2782 february 21, 2014 15 revision 2.0 micrel, inc. 2180 fortune drive san jose, ca 95131 usa tel +1 (408) 944 - 0800 fax +1 (408) 474 - 1000 web http://www.micrel.com micrel makes no representations or warranties with respect to the accuracy or comp leteness of the information furnished in this data sheet. this information is not intended as a warranty and micrel does not assume responsibility for its us e. micrel reserves the right to change circuitry, spe cifications and descriptions at any time without notice. no license, whether express, implied, arising by estoppel or otherwise, to any intellectual property rights is granted by this document. except as provided in micrels terms and conditions of sale for such products, mic rel assumes no liability whatsoever, and micrel disclaims any express or implied warranty relating to the sale and/ or use of micrel products including liability or warranties relating to fitness for a particular purpose, merchantability, or infringement of any paten t, copyright or other intellectual property right . micrel products are not designed or authorized for use as components in life support appl iances, devices or systems where malfunction of a product can reasonably be expecte d to result in personal injury. life support devices or systems are devices or system s that (a) are intended for surgical imp lant into the body or (b) support or sustain life, and whose failure to perform can be reasonably expected to res ult in a signific a nt injury to the user. a purchasers use or sale of micrel products for use in life support appliances, devices or systems is a purchasers own risk and purchaser agrees to fully indemnify micrel for any damages resulting from such use or sale. ? 2012 mic rel, incorporated. downloaded from: http:///

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