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mic 826 voltage supervisor with watchdog timer, manual reset , and dual outputs i n 1.6mm x 1.6mm tdfn 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 4 , 2013 revision 1.0 general description the mic826 is a low - cu rrent, ultra - small, voltage s upervisor with manual reset input, watchdog timer , and active - high and active - low push - pull outputs. the reset outputs are asserted and held when the supply voltage falls below the fact ory - programmed threshold voltage , when the /mr pin is pulled low , or if the watchdog times out . reset is asserted for the reset timeout delay after the supply voltage increases above the rising threshold voltage or when manual reset input is asserted high. the mic 826 features an integrat ed pull - up resistor on the /mr. an active - low push - pull reset output (/ reset ) and an active - high reset output (r eset ) provide flexibility when interfacing with various microcontrollers, pmics, or load switches. the watchdog input can be left unconnected for applications that do not require watchdog monitoring. the mic826 consume s a quiesc ent current of only 3. 8 a and is offered in a tiny, space - saving , 6 - pin 1.6mm x 1.6mm t hin dfn package . it is rated for the ? 40 c to +125 c temperature range. data sheets and support documentation are available on micrel?s web site at: www.micrel.com . features ? pre cision 1.8v to 5 v power supply monitor ? 0.5% threshold accuracy at t a = +25 c ? 1.5% thresho ld accuracy from t a = ? 40 c to +125 c ? 3. 8 a s upply c urrent (mic826 s/r/t/w/y/z) ? 4. 8 a supply current (mic826l/m) ? manual reset i nput ? 140ms (min . ) reset timeout period ? 1.6s (typ . ) watchdog timeout period ? float watchdog timer input to disable watchdog t imer ? a ctive - high and active - low push - pull outputs ? guaranteed res e t output valid to vcc = 1v ? ? 40c to + 12 5c junction temperature range ? 6 - pin 1.6mm x 1.6 mm x 0.5mm t hin dfn package ? 50% smaller version of max823/max824/max82 5/adm823/adm824/adm825 ? 8 x lower watchd og input current than competition applications ? microprocessor systems ? computers ? intelligent instruments ____________________________________________________________________________ _____________________________________________ typical application
micrel, inc. mic826 february 4 , 2013 2 revision 1. 0 or dering information part number top marking v rst : nominal threshold voltage (v) package junction temperature range lead finish mic826lymt 82l 4.625 6 - pin 1.6mm 1.6mm tdfn ? 40c to +125c pb - free mic826mymt 82m 4.375 6 - pin 1.6mm 1.6mm tdfn ? 40c to +125c pb - free mic826tymt 82t 3.075 6 - pin 1.6mm 1.6mm tdfn ? 40c to +125c pb - free mic826symt 82s 2.925 6 - pin 1.6mm 1.6mm tdfn ? 40c to +125c pb - free mic826rymt 82r 2.625 6 - pin 1.6mm 1.6mm tdfn ? 40c to +125c pb - free mic826zymt 82z 2.315 6 - pin 1.6mm 1.6mm tdfn ? 40c to +125c pb - free MIC826YYMT 82y 2.188 6 - pin 1.6mm 1.6mm tdfn ? 40c to +125c pb - free mic826wymt 82w 1.665 6 - pin 1.6mm 1.6mm tdfn ? 40c to +125c pb - free pin configuration 6 - pin 1.6 mm 1.6mm tdfn ( top view ) pin descrip tion pin number pin name pin function 1 /reset active - low reset output. pulses low for 200ms when triggered, and remains low whenever vcc is below the reset threshold or when /mr is a logic low. it remains low for 200ms after one of the following occurs: vcc rises above the reset threshold, the watchdog triggers a reset, or / mr goes low to high. 2 gnd supply ground . 3 reset active - high reset output. pulses high for 200ms when triggered, and remains high whenever vcc is below the reset threshold or when / mr is a logic low. it remains high for 200ms after one of the following occurs: vcc rises above the reset threshold, the watchdog triggers a reset, or / mr goes low to high. reset is the inverse of /reset. 4 wdi watchdog input. if wdi remains either high o r low for longer than the watchdog timeout period, the internal watchdog timer runs out and a reset is triggered. the internal watchdog timer clears whenever reset is asserted, or whenever wdi sees a rising or falling edge. if wdi is left unconnected or is connected to a three - stated buffer output, the watchdog feature is disabled. 5 /mr manual reset input. a logic low on /mr asserts reset. reset remains asserted as long as /mr is held low and for 200ms after /mr returns high. the active - low input has an i nternal 52k pull - up resistor. it can be driven from a cmos logic line or shorted to ground with a switch. leave open or connect to vcc if unused. 6 vcc supply voltage pin. vcc is the input to the supply v oltage monitor. when the supply voltage falls belo w the reset threshold voltage, reset outputs (/reset and reset) are triggered immediately. when the supply voltage rises above the reset threshold plus hysteresis voltage, the reset outputs remain asserted for the duration of the reset timeout period. a de coupling ceramic capacitor ( minimum 0.1 f) must be connected between vcc and gnd close to the pins. ep e pad exposed pad. connect to gnd.
micrel, i nc. mic826 february 4 , 2013 3 revision 1. 0 absolute maximum ratings (1) supply voltage (v cc) .................................. ? 0.3v to + 6.0v /mr, wdi, reset, /reset ................ ? 0.3v to v cc + 0.3v input current, al l pins e xcept (reset, /reset ) ....... 20ma output current (reset, /reset) .............................. 20ma junction temperature (t j ) ........................ ? 40c to +150c storage temperature (ts) ......................... ? 6 5 c to + 150c e sd rating (human body model ) ( 3) ........................... 1.5 kv esd rating (machine model ) ( 3) .................................... 2 00v operating ratings (2) supply voltage (v cc) ..................................... +1v to +5.5v w atchdog input (wdi) ..................................... 0v to +vcc junction temperature (t j ) ........................ ? 40c to +125c junction thermal resistance 1.6mm 1.6mm tdfn ( ja ) ........................... 92.4c/w 1.6mm 1.6mm tdfn ( jc ) ........................... 56.4c/w electrical characteristics (4) vcc = 4.7v to 5.5v for mic826l, vcc = 4.5 v to 5.5v for mic826m, vcc = 3.15 v to 3.6v for mic826t, vcc = 3.0 v to 3.6v for mic826s, vcc = 2.7 v to 3.6v for mic826r, vcc = 2.38v to 2.75v for mic826z, vcc = 2.25 v to 2.75v for mic826y, v cc = 1.75 v to 2.0v for mic826w; t j = +25?c, bold values (5) indicate ? 40?c t j +125?c, unless otherwise noted . parameter conditions min. typ. max. units power supply input supply voltage (v cc) 1 .0 5.5 v supply current ( i v cc ) mic826l/m (wdi and /mr unconnected) 4. 8 14 a mic826t/s/r/z/y/w (wdi and /mr unconnected) 3. 8 8.4 reset threshold voltage reset threshold voltage (v rst ) l (falling) t a = 25 c 4.602 4.625 4.648 v l (falling) ? 40c t a + 125 c 4.556 4.6 94 m (falling) t a = 25 c 4.353 4.375 4.397 m (falling) ? 40 c t a + 125 c 4.309 4.441 t (falling) t a = 25 c 3.060 3.075 3.090 t (falling) ? 40c t a + 125 c 3.029 3.121 s (falling) t a = 25 c 2.910 2.925 2.940 s (falling) ? 40c t a + 125 c 2.881 2.969 r (falling) t a = 25 c 2.612 2.625 2.638 r (falling) ? 40c t a + 125 c 2.586 2.664 z (falling) t a = 25 c 2.303 2.315 2.327 z (falling) ? 40c t a + 125 c 2.280 2.350 y (falling) t a = 25 c 2.177 2.188 2.199 y (falling) ? 40c t a + 125 c 2.155 2.221 w (falling) t a = 25 c 1.657 1.665 1.673 w (falling) ? 40c t a + 125 c 1.640 1.690 reset threshold hysteresis l, m 10 mv t, s, r, z, y, w 5 mv reset threshold tempco 40 ppm/ ?c
micrel, i nc. mic826 february 4 , 2013 4 revision 1. 0 electrical characteristics ( 4) (continued) vcc = 4.7v to 5.5v for mic826l, vcc = 4.5 v to 5.5v for mic826m, vcc = 3.15 v to 3.6v for mic826t, vcc = 3.0 v to 3.6v for mic826s, vcc = 2.7 v to 3.6v for mic826r, vcc = 2.38v to 2.75v for mic826z, vcc = 2. 25v to 2.75v for mic826y, v cc = 1.75 v to 2.0v for mic826w; t a = +25?c, bold values (5) indicate ? 40?c t a +125?c, unless otherwise noted. parameter conditions min. typ. max. units reset timeout period (t rp ) 140 200 280 ms reset time vcc to /reset del ay (t rd ) 10 s reset outputs (/reset, reset) /reset output voltage high (v oh ) l, m: v cc = v rst (max) , i source = 120 a vcc ? 1.5 v t, s, r, z, y: v cc = v rst (max) , i source = 30 a 0.8 vcc w: v cc = v rst (max) , i source = 20 a 0.8 vcc /r eset output voltage low (v ol ) l, m: v cc = v rst (min) , i sink = 3.2ma 0.4 v t, s, r, z, y, w: v cc = v rst (min) , i sink = 1.2ma 0.3 t a = 0 ? c to +70? c, vcc = 1v, i sink =50 a 0.3 vcc = 1.2v, i sink =100 a 0.3 /reset output short - circuit current (6) l, m: /reset = 0v, vcc = 5.5v 800 a t, s, r, z, y, w: /reset = 0v, vcc = 3.6v 400 reset output voltage high (v oh ) vcc > 1.6v , i source = 150 a 0.8 vcc v reset output voltage low (v ol ) l, m: v cc = v rst (max) , i sink = 3.2ma 0.4 v t , s, r, z, y, w: v cc = v rst (max) , i sink = 1.2ma 0.3 watchdog input (wdi) (7) watchdog timeout period (t wd ) 1.12 1.60 2.40 s watchdog pulse width 50 ns watchdog input low voltage (v il ) 0.3 vcc v watchdog input high voltage (v ih ) 0.7 vcc watchdog input current wdi = vcc 15 25 a wdi = 0v ? 20 ? 15
micrel, i nc. mic826 february 4 , 2013 5 revision 1. 0 electrical characteristics (4) (continued) vcc = 4.7v to 5.5v for mic826l, vcc = 4.5 v to 5.5v for mic826m, vcc = 3.15 v to 3.6v for mic826t, vcc = 3.0 v to 3.6v for mic826s, vcc = 2.7 v t o 3.6v for mic826r, vcc = 2.38v to 2.75v for mic826z, vcc = 2.25 v to 2.75v for mic826y, v cc = 1.75 v to 2.0v for mic826w; t a = +25?c, bold values (5) indicate ? 40?c t a +125?c, unless otherwise noted. parameter conditions min. typ. max. units manual reset input (/mr) input low voltage (v il ) 0.3 vcc v input high voltage (v ih ) 0.7 vcc v /mr pulse width 1.0 s /mr noise immunity (p ulse width with no reset) 100 ns /mr to reset delay 500 ns /mr internal pull - up resistor 35 52 75 k notes: 1. exceeding the absolute maximum rating s may damage the device. 2. the device is not guaranteed to function outside its operating rating s . 3. devices are esd sensitive. handling precautions are recommended. human body model, 1.5k in series with 100pf. 4. specification s are for packaged product only . 5. overtemperature limits are guaranteed by design and not product tested. 6. the /reset short - circuit current is the maximum pull - up current when /reset is driven low by p bi directional reset pin. 7. the wdi input is designed to drive a three - state output device with a 10 a maximum leakage current and a maximum capacitance of 200pf.
micrel, i nc. mic826 february 4 , 2013 6 revision 1. 0 t ypical characteristics 0 1 2 3 4 5 6 7 0 1 2 3 4 5 6 supply current (a) input voltage (v) supply current vs. input voltage /mr =open wdi = open mic826w mic826y mic826l 0 1 2 3 4 5 6 7 -40 -15 10 35 60 85 supply current (a) temperature ( c) supply current vs. temperature /mr = open wdi = open mic826l, vcc = 5.5v mic826w, vcc = 2v mic826y, vcc = 2.75v 0 50 100 150 200 250 -40 -15 10 35 60 85 reset timeout period (ms) temperature ( c) reset timeout period vs. temperature /mr=open wdi = open 0 2 4 6 8 10 12 14 -40 -15 10 35 60 85 vcc to reset delay (s) temperature ( c) vcc to reset delay vs. temperature vcc falling /mr = open wdi = open 0 100 200 300 400 500 600 700 800 -40 -15 10 35 60 85 /mr to reset delay (ns) temperature ( c) /mr to reset delay vs. temperature /mr = switch wdi = open 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 -40 -15 10 35 60 85 watchdog timeout period (s) temperature ( c) watchdog timeout period vs. temperature 0.920 0.940 0.960 0.980 1.000 1.020 1.040 1.060 -40 -15 10 35 60 85 reset threshold voltage(v) temperature ( c) normalized reset threshold vs. temperature 0 5 10 15 20 25 0 50 100 150 200 250 300 350 400 450 500 transient duration (s) overdrive (mv) supply transient duration vs. overdrive /mr = open wdi = open c1 = open f vcc = 10khz mic826w mic826y mic826l
micrel, i nc. mic826 february 4 , 2013 7 revision 1. 0 functional diagram figure 1. functional diagram timing diagram f igure 2. timing diagram
micrel, i nc. mic826 february 4 , 2013 8 revision 1. 0 functional description design and product advantages the mic826 is a voltage supervisor reset ic wit h a manual reset input , watchdog input , and dual reset outputs . the mic826 assert s and hold s a reset when the supply volt age falls below the factory - programmed threshold voltage , when /mr is at low logic level , or when watchdog input times out . r eset is as se rted for a fixed reset timeout period after the supply voltage increases above the rising threshold voltage or when the manual reset input is asserted high . the mic826 features an active - low, push - pull reset output (/r eset ) and an active - high, push - pull reset output (r eset ). it also contains 52k pull - u p resistors on the /mr input to make it easy to connect to pushbutton inputs. the mic826 also feature s a watchdog (wdi) input. manual reset input (/mr ) the /mr input pin has integrated p ull - up resistors t o keep the current consumption l ow when the push button switch is pressed . reset output s (/r eset and reset ) the re are two reset outputs : /reset and reset . b oth outputs are push - pull , which eliminates the need for pull - up resistors. the reset output is the i nverse of the /reset output. asserting /r eset and r eset outputs when functioning a s a manual reset the reset outputs /r eset and r eset are asserted while the /mr pin is driven low. both reset outputs remain asserted for a factory - programmed reset timeout d elay time , t rp . the typical value of a reset timeout period is 200 ms . the /reset pin is driven low while the reset pin is driven high whenever /mr is pulled low. figure 3 . manual reset function when functioning a s a voltage supervisor the /reset pin is asserted whenever v cc falls below the reset threshold voltage , v rst (v cc < v rst ). the v cc pin circuitry includes hysteresis to prevent /r e s e t or reset pin chattering due to noise. t he /reset pin remains asserted for the duration of the reset timeout del ay ( t rp ) after v cc has risen above the reset threshold voltage plus the hysteresis . the reset function ensures that a microprocessor is properly reset and powers up in a known cond ition after a power failure. the /r e s e t remain s valid with v cc as low as 1 v. the reset output i s a comple ment of the / reset output. figure 4 . voltage supervisor function
micrel, i nc. mic826 february 4 , 2013 9 revision 1. 0 watchdog input the mic826 has an on - chip watch dog timer that can reset the microprocessor if it fails to strobe the wdi input within a preset timeout period (t wd ). if the wdi pin is left unconnected , this function is disabled. the watchdog timeout period starts when either of the reset outputs becomes inactive and either a high - to - low or low - to - high transition occurs before the watchdog timeout period (t wd ). if the watchdog timer times out , then the reset outputs will assert and stay asserted for a reset timeout period (t rp ). t he watchdog timer is also cleared whenever the reset out put s are asserted by /mr , or if vcc falls below v rst . t he watchdog timer starts again whenever the reset out put s are de - asserted. figure 5. watchdog timing watchdog input current the wdi input current is the current sourced or sinked by the wdi pin when the wdi input is driven low or high , respectively. the wdi input is design ed to drive a t ri - state output device with a 10 a maximum leakage current and a maximum capacitance of 200pf. v cc transient the mic826 is relatively immune to small negative - going v cc glitches below the reset threshold. as shown in figure 6 , the overdrive voltage is the difference between the threshold voltage and the minimum point of the v cc glitch. typically, an overdrive of 1 00mv with duration of 2 s or less will not cause a reset. figure 6 . v cc transient reset valid up - to vcc = 1 v the m ic826 is a supervisory circuit that monitors the power supply voltage level . i f the power supply voltage level falls below the factory - programmed threshold level , then the reset signals are asserted. the mic826 maintains the reset states with vcc as low as 1v. supply bypass capacitor an optional 0.1 f input bypass capacitor can be placed from vcc (pin 6) to gnd (pin 2) to increase glitch rejection.
micrel, i nc. mic826 february 4 , 2013 10 revision 1. 0 typical applications figure 7 . mic826 for p recision p ower g ood f unction figure 8 . mic826 use d for load switch figure 9. mic826 used for microcontroller reset with watchdog input
micrel, i nc. mic826 february 4 , 2013 11 revision 1. 0 evaluation board schematic bill of materials item part number manufacturer description qty. c1 grm188r71c104ka01d murata (1) 0.1 f, 16v capacitor, x7r, 0603 1 u1 mic 826 x ymt micrel, inc. ( 2 ) voltage supervisor with watchdog timer, manual reset, and dual outputs in 1.6mm x 1.6mm tdfn 1 notes: 1. murata : www.murata.com . 2. micrel , inc.: www.m icrel.com .
micrel, i nc. mic826 february 4 , 2013 12 revision 1. 0 pcb layout recommendations top layer bottom layer
micrel, i nc. mic826 february 4 , 2013 13 revision 1. 0 package information (1) 6 - pin 1.6 mm 1.6 mm tdfn notes: 1. package information is correct as of the publication date. for updates and most current information, go to www.micrel.com .
micrel, i nc. mic826 february 4 , 2013 14 revision 1. 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 completeness of the information furnished in this data sheet. this information is not intended as a warranty and micrel does not assume responsibility for its use. micrel reserves the right to change circuitry, specifications 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 micrel?s terms and conditions of sale for such products, micrel ass umes 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 pa tent, copyright or other intellectual property right . micrel products are not designed or authorized for use as components in life support appliances, devices or systems where mal function of a product can reasonably be expected to result in personal injur y. life support devices or systems are devices or systems that (a) are intended 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 signific ant injury to the user. a purc haser?s use or sale of micrel products for use in life support appliances, devices or systems is a purchaser?s own risk and p urchaser agrees to fully indemnify micrel for any damages resulting from such use or sale. ? 2013 micrel, incorporated.
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