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mic2788/mic2789 push-button reset ic mlf and micro leadframe are registered trademarks of amkor technologies, inc. micrel inc. ? 2180 fortune drive ? san jose, ca 95131 ? usa ? tel +1 (408) 944-0800 ? fax + 1 (408) 474-1000 ? http://www.micrel.com october 2011 m9999-102711-a general description the mic2788/mic2789 are low-current, ultra-small, push- button reset supervisors with long set-up delays. the devices feature two manual reset inputs and two reset outputs. the devices initiate a reset for the reset timeout period when the /mr0 and /mr1 inputs are asserted low for a period longer than the set-up delay. the two manual reset inputs and long set-up period help to avoid unintended system resets. both manual reset inputs can be tied together if a single push-button reset is desired. the mic2788 features integr ated pull-up resistors on the /mr0 and /mr1 inputs, while the mic2789 requires external pull-up resistors. the pdy input pin selects between a 2s, 4s or 6s set-up period. factory-programmed reset timeout periods of 140ms (min.) and 240ms (min.) are available. an active-low, open-drain reset output (/rst) and an active-high, push-pull reset output (rstp) provide flexibility when interfacing to various microcontrollers, pmics, or load switches. the mic2788/mic2789 consum e a quiescent current of only 2.9a and are offered in a tiny, space-saving 8-pin thin mlf ? (2mm x 2mm x 0.55mm) package. data sheets and support documentation can be found on micrel?s web site at: www.micrel.com . features ? 1.6v to 5.5v operating voltage ? 2.9a supply current when /mr0, /mr1 are not asserted ? asserting /mr0 and /mr1 for longer than set-up delay asserts reset output for the reset timeout period ? programmable delay (pdy) input selects 2.0s, 4.0s or 6.0s set-up delay ? factory-programmed 140ms (min.) or 240ms (min.) reset timeout period ? integrated /mr0, /mr1 pu ll-up resistors (mic2788) ? dual reset outputs: ? open-drain active-low reset (/rst) output ? push-pull active-high reset (rstp) output ? ? 40c to 85c ambient operating temperature range ? 8-pin 2mm x 2mm x 0.55mm thin mlf ? package applications ? smart phones ? mp3 players ? portable navigation devices ? set-top boxes (stbs) ? tablets/pads _________________________________________________________________________________________________________________________ typical application
micrel, inc. mic2788/mic2789 october 2011 2 m9999-102711-a ordering information (1) part number marking minimum t reset (ms) package (3,4) integrated pull-up resistors mic2788-xymt 8xa 140 8-pin (2mm 2mm) thin mlf ? yes MIC2788-YYMT (2) 8ya 240 8-pin (2mm 2mm) thin mlf ? yes mic2789-xymt 9xa 140 8-pin (2mm 2mm) thin mlf ? no mic2789-yymt (2) 9ya 240 8-pin (2mm 2mm) thin mlf ? no notes: 1. all devices available in tape and reel only. 2. contact factory for availability. 3. thin mlf ? = pin 1 identifier. 4. thin mlf ? is a green rohs compliant package. lead finish is nipdau. mold compound is halogen free. pin configuration mic2788/89 8-pin (2mm 2mm) thin mlf ? top view pin description pin number pin name pin function 1 rstp active-high push-pull reset output. this output changes from low-to-high when both manual reset pins are pulled low for the setup delay per iod. rstp remains high for the reset timeout delay duration after the setup delay period has elapsed. 2 gnd supply ground. 3 /mr1 active-low manual reset input. the mic2788 has an internal 65k ? pull-up resistor to vin while the mic2789 requires an external pull-up resistor to vin if used with a push-button. pull this pin low to assert and force a reset. pulling both m anual reset inputs low for the setup delay time causes one reset output pulse for the reset tim eout delay period. connect to vin if unused, do not leave floating. 4 /rst active-low open drain reset output. this output changes from high to low when both manual reset pins are pulled low for the setup delay perio d. /rst remains low for the reset timeout delay after the setup delay has elapsed and it requires an external pull-up resistor. 5 pdy programmable delay input with tri-state connec tion. when left open, set-up delay is 2s, when connected to gnd, set-up delay is 4s and when connected to vin, set-up delay is 6s.
micrel, inc. mic2788/mic2789 october 2011 3 m9999-102711-a pin description (continued) pin number pin name pin function 6 nc no connect. leave pin floating. 7 /mr0 active-low manual reset input. the mic2788 has an internal 65k ? pull-up resistor to vin while the mic2789 requires an external pull-up resistor to vin if used with a push-button. pull this pin low to assert and force a reset. pulling both m anual reset inputs low for the setup delay time causes one reset output pulse for the reset ti meout delay period. if unused, connect to vin; do not leave floating. 8 vin positive supply voltage. a minimum 0.1 f decoupling ceramic capacitor must be connected between vin and gnd close to the pins. epad epad exposed pad. connect to gnd.
micrel, inc. mic2788/mic2789 october 2011 4 m9999-102711-a absolute maximum ratings (1) supply voltage (v in ) ..................................... ? 0.3v to + 6.0v reset input voltage (/mr0, /mr1). ....... ? 0.3v to v in + 0.3v open drain reset output (/rst) ................. ? 0.3v to + 6.0v push-pull reset output (rstp)............ ? 0.3v to v in + 0.3v tri-state programmable delay (pdy)... ? 0.3v to v in + 0.3v lead temperature (solde ring, 10sec .) ....................... 260c junction temperature (t j ) ........................ ? 40 c to +150 c storage temper ature (ts)......................... ? 55c to + 150c esd rating (human body model) (3) .............................. 2kv esd rating (machine model) (3) ....................................300v operating ratings (2) supply voltage (v in )..................................... +1.6v to +5.5v reset input voltage (/mr 0, /mr1)......................... 0v to v in open drain reset output (/rst)...................... 0v to +5.5v push-pull reset output (/rstp) ........................... 0v to v in tri-state programmable de lay (pdy).................... 0v to v in ambient temperature (t a ) .......................... ?40c to +85c junction thermal resistance 2mm 2mm thin mlf ? ( ja ).............................90c/w electrical characteristics (4) v in = 3.0v, t a = 25c, bold values indicate ?40c t a +85c; unless noted otherwise. parameter conditions min. typ. max. units power supply input supply voltage (v in ) 1.6 5.5 v v in = 5v; /mr0, /mr1, /rst, rstp, and pdy open 3.4 7.5 supply current (i in ) v in = 3v; /mr0, /mr1, /rst, rstp, and pdy open 2.9 a reset time pdy = open 1.6 2.0 2.4 pdy = 0v 3.2 4.0 4.8 set-up delay (t setup ) pdy = v in 4.8 6.0 7.2 s option x 140 220 280 reset timeout delay (t reset ) option y 240 350 480 ms reset outputs (/rst, rstp) v in = 4.5v, i sink = 3.2ma 0.3 v in = 3.3v, i sink = 2.5ma 0.3 reset output voltage low (/rst output and rstp output) (v ol ) v in = 1.6v, i sink = 1.0ma 0.3 v v in = 4.5v, i source = 0.8ma 0.8 vin v in = 2.7v, i source = 0.5ma 0.8 vin reset output voltage high (rstp output) (v oh ) v in = 1.6v, i source = 250 a 0.8 vin v /rst output leakage (i lo ) v /rst = 5.5v 0.3 a 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 pr ecautions recommended. human body model, 1.5k ? in series with 100pf. 4. specification for packaged product only.
micrel, inc. mic2788/mic2789 october 2011 5 m9999-102711-a electrical characteristics (4) (continued) v in = 3.0v, t a = 25c, bold values indicate ?40c t a +85c; unless noted otherwise. parameter conditions min. typ. max. units manual reset inputs (/mr0, /mr1) input high voltage (v ih ) 1.2 v input low voltage (v il ) 0.3 v internal pull-up resistor (r pu ) mic2788 only 65 k ? leakage current /mr0, /mr1 pin (i mr ) /mr0, /mr1 inputs; mic2789 only ? 1.0 1.0 a programmable setup delay input (pdy) pdy = v in , /mr0 = /mr1 = 0v +60 a pdy = v in , /mr0 = v in or /mr1= v in 100 na pdy = 0v, /mr0 = /mr1 = 0v -60 a input bias current pdy pin (i pdy ) pdy = 0v, /mr0 = v in or /mr1 = v in 100 na
micrel, inc. mic2788/mic2789 october 2011 6 m9999-102711-a typical characteristics v in supply current vs. temperature (pdy = open) 1.0 1.6 2.2 2.8 3.4 4.0 -40 -15 10 35 60 85 temperature (c) supply current (a) v in = 3.0v pdy = open setup delay vs. temperature (pdy = open) 1.0 1.5 2.0 2.5 3.0 -40 -15 10 35 60 85 temperature (c) dual reset delay (s) v in = 3.0v pdy = open reset timeout delay (option x) vs. temperature (pdy = open) 200 210 220 230 240 250 -40 -15 10 35 60 85 temperature (c) reset timeout delay (ms) v in = 3.0v pdy = open v in supply current vs. temperature (pdy = 0v) 1.0 1.6 2.2 2.8 3.4 4.0 -40 -15 10 35 60 85 temperature (c) supply current (a) v in = 3.0v pdy = 0v setup delay vs. temperature (pdy = 0v) 3.0 3.5 4.0 4.5 5.0 -40 -15 10 35 60 85 temperature (c) dual reset delay (s) v in = 3.0v pdy = 0v reset timeout delay (option x) vs. temperature (pdy = 0v) 200 210 220 230 240 250 -40 -15 10 35 60 85 temperature (c) reset timeout delay (ms) v in = 3.0v pdy = 0v v in supply current vs. temperature (pdy = v in ) 1.0 1.6 2.2 2.8 3.4 4.0 -40 -15 10 35 60 85 temperature (c) supply current (a) v in = 3.0v pdy = v in setup delay vs. temperature (pdy = v in ) 5.0 5.5 6.0 6.5 7.0 -40 -15 10 35 60 85 temperature (c) dual reset delay (s) v in = 3.0v pdy = v in reset timeout delay (option x) vs. temperature (pdy = v in ) 200 210 220 230 240 250 -40 -15 10 35 60 85 temperature (c) reset timeout delay(ms) v in = 3.0v pdy = v in
micrel, inc. mic2788/mic2789 october 2011 7 m9999-102711-a typical characteristics (continued) v in supply current vs. input voltage 1.5 2.2 2.9 3.6 4.3 5.0 0123456 input voltage (v) supply current (a) /mr0 = not asserted /mr1 = not asserted setup delay vs. input voltage 0.0 2.0 4.0 6.0 8.0 10.0 0123456 input voltage (v) dual reset delay (s) pdy = 0v pdy =v in pdy =open reset timeout delay (option x) vs. input voltage 200 210 220 230 240 250 0123456 input voltage (v) reset timeout delay (ms)
micrel, inc. mic2788/mic2789 october 2011 8 m9999-102711-a timing diagram
micrel, inc. mic2788/mic2789 october 2011 9 m9999-102711-a functional diagram
micrel, inc. mic2788/mic2789 october 2011 10 m9999-102711-a application information design and product advantages the dual reset programmability of the mic2788/ mic2789 allows for already existing manual push buttons to be used to generate a hardware reset based on pre-programmed timing requi rements. this ability to increase the functionality of already existing buttons, allows for cost reduction and more robust phone designs. the dual reset delay time allows for significant protection against accidental resets due to its long time duration and dual push button requirement. the fixed reset timeout delay allows for more predictable phone operation during hardware resets. the tri-state option provides an easy to use way to select between three reset delay time options with no additional external components required. supply bypass capacitor a 0.1f input bypass capacitor must be placed from v in (pin 8) to gnd (pin 2). programmable delay pin (pdy) the mic2788/mic2789 has a programmable dual reset delay time, t setup , that is set via a tri-state logic configuration. the pdy pin is intended to be connected to the v in supply voltage, ground or left floating. pdy configuration t setup open 2s gnd 4s v in 6s dual manual reset inputs (/mr0, /mr1) the /mr0, /mr1 input pins have integrated pull-up resistors for the mic2788 but require external pull-up resistors for the mic2789. a recommended value is 100k ? to keep the current consumption low when the push-button switches are pressed. the behavior of the reset outputs is independent of the order in which the /mr0, /mr1 inputs are driven low. if both inputs are low for a setup delay time, only one reset pulse, of width t reset , is generated. keeping both inputs low for a longer time does not generate additional reset output pulses. reset outputs (/rst and rstp) the /rst output is a simple open-drain n-channel mosfet structure that requi res a pull-up resistor. for most applications, the pull-up voltage will be the same as the power supply that supplies v in to the mic2788/mic2789. as shown in figure 1, it is possible to tie this resistor to some other voltage, other than v in , thus enabling level-shifting of the /rst output. the pull- up voltage must be limited to 5.5v or less to avoid damage to the mic2788/mic2789. the pull-up resistor must be small enough to supply current to the inputs and leakage paths that are driven by the /rst output. a recommended value is 100k ? . leave floating if the /rst pin is unused. the rstp pin is a push-pull output that is driven to v in . it cannot be level-shifted to another voltage. it is an inverted signal of /rst. figure 1. mic2788/mic2789 used in multiple supply system the reset outputs /rst a nd rstp are asserted when the dual reset delay time, t setup , is exceeded while the /mr0, /mr1 pins are driven low. both the reset outputs remain asserted for a factory-programmed reset timeout delay time t reset . two options are available with 140ms or 240ms minimum t reset duration. the /rst pin is driven active low while the rstp pin is driven active high for the t reset duration. the reset outputs are de- asserted for v in < 1.6v. figure 2. manual reset function
micrel, inc. mic2788/mic2789 october 2011 11 m9999-102711-a typical applications figure 3. mic2788/89 used for interrupting system power figure 4. mic2788/89 used for microcontroller reset
micrel, inc. mic2788/mic2789 october 2011 12 m9999-102711-a evaluation board schematic bill of materials item part number manufacturer description qty. c1 grm188r71c104ka01d murata (1) 0.1f, 16v capacitor, x7r, 0603 1 r1, r2, r4 crcw0603100kjnea vishay (2) 100k, 5% resistor, 0603 3 mic2788-xymt u1 mic2789-xymt micrel, inc. (3) push-button supervisor reset ics 1 notes: 1. murata tel: www.murata.com . 2. vishay tel: www.vishay.com . 3. micrel, inc.: www.micrel.com .
micrel, inc. mic2788/mic2789 october 2011 13 m9999-102711-a pcb layout recommendations top layer top silkscreen
micrel, inc. mic2788/mic2789 october 2011 14 m9999-102711-a pcb layout recommendations (continued) copper layer bottom silkscreen
micrel, inc. mic2788/mic2789 october 2011 15 m9999-102711-a package information 8-pin 2mm 2mm thin mlf ?
micrel, inc. mic2788/mic2789 october 2011 16 m9999-102711-a recommended landing pattern 8-pin 2mm 2mm thin mlf ?
micrel, inc. mic2788/mic2789 october 2011 17 m9999-102711-a 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 t he accuracy or completeness of the information furnished in this data sheet. this information is not intended as a warranty and micrel does not assume responsibility for it s use. micrel reserves the right to change circuitry, specifications and descriptions at any time without notice. no license, whether expre ss, implied, arising by estoppel or other wise, to any intellectual property rights is granted by this document. except as provided in micrel?s terms and conditions of sale for such products, mi crel assumes no liability whatsoever, and micrel disclaims any express or implied warranty relating to the sale and/or use of micrel products including l iability or warranties relating to fitness for a particular purpose, merchantability, or infringement of an y patent, copyright or other intellectual p roperty right. micrel products are not designed or authori zed for use as components in life support app liances, devices or systems where malfu nction of a product can reasonably be expected to result in pers onal injury. life support devices or system s are devices or systems that (a) are in tended for surgical implant into the body or (b) support or sustain life, and whose failure to perform can be reasonably expected to result in a significan t injury to the user. a purchaser?s use or sale of micrel produc ts for use in life support app liances, devices or systems is a purchaser?s own risk and purchaser agrees to fully indemnify micrel for any damages resulting from such use or sale. ? 2011 micrel, incorporated.

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