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mic803 3- pin microprocessor supervisor circuit with open - drain reset output micrel inc. ? 2180 fortune drive ? san jose, ca 95131 ? usa ? tel +1 (408) 944 - 0800 ? fax + 1 (408) 474 - 1000 ? http://www.micrel.com august 3, 2015 revision 1.2 general description the mic803 is a single - voltage supervisor with open - drain reset output that provides accurate power supply monitoring and reset generation in microprocessor - based systems. the function of the device is to assert a reset signal if the po wer supply voltage drops below the reset threshold voltage, and retain this reset for the reset timeout period once the power supply increases above the reset threshold voltage. the mic803 consumes only 4.5 a of supply current and offers three reset delay periods of 20ms, 140ms, and 1120ms (minimum). it features factory - programmed reset threshold levels from 2.63v to 4.63v to accommodate 3.0v, 3.3v, and 5.0v power supplies. it is available in the compact 3 - pin sc - 70 and sot - 23 packages. datasheets and supp ort documentation are available on micrels web site at : www.micrel.com . features ? 4.5 a supply current (typical) at 3.6v ? open - drain /reset output ? /reset remains valid with v cc as low as 1v ? 20ms, 140ms, or 1120ms (minimum) reset timeout options ? 2.63v to 4.63v preset voltage threshold options ? 2.5% voltage threshold accuracy over temperature ? 3- pin sc70 - 3 package (2.0mm 2.1mm) ? 3- pin sot - 23 package (2.3mm 2.9mm) ? - 40 ? c to +125 ? c junction temperature range applications ? critical microcomputer power monitoring ? portable equipment ? solid state drives ? printers/computers ? embedded c ontrollers typi cal application v cc 100k v cc reset v cc p mic803 gnd gnd reset downloaded from: http:///
micrel, inc. mic803 august 3, 2015 2 revision 1.2 ordering information ( 1 ) part number marking ( 2 ) nominal v th (v) minimum t reset ( 3 ) (ms) junction temperature range package mic803 - 46d2v c3 as 4.63 20 C 40 to +125c sc70 -3 mic803 - 44d2v c3 ap 4.38 20 C 40 to +125c sc70 -3 mic803 - 41d2v c3 ak 4.10 20 C 40 to +125c sc70 -3 mic803 - 40d2v c3 a2 4.00 20 C 40 to +125c sc70 -3 mic803 - 31d2v c3 ag 3.08 20 C 40 to +125c sc70 -3 mic803 - 30d2v c3 av 3.00 20 C 40 to +125c sc70 -3 mic803 - 29d2v c3 ad 2.93 20 C 40 to +125c sc70 -3 mic803 - 26d2v c3 aa 2.63 20 C 40 to +125c sc70 -3 mic803 - 46d3v c3 at 4.63 140 C 40 to +125c sc70 -3 mic803 - 44d3v c3 aq 4.38 140 C 40 to +125c sc70 -3 mic803 - 41d3v c3 am 4.10 140 C 40 to +125c sc70 -3 mic803 - 40d3v c3 a5 4.00 140 C 40 to +125c sc70 -3 mic803 - 31d3v c3 a4 3.08 140 C 40 to +125c sc70 -3 mic803 - 30d3v c3 ax 3.00 140 C 40 to +125c sc70 -3 mic803 - 29d3v c3 ae 2.93 140 C 40 to +125c sc70 -3 mic803 - 26d3v c3 ab 2.63 140 C 40 to +125c sc70 -3 mic803 - 46d4v c3 au 4.63 1120 C 40 to +125c sc70 -3 mic803 - 44d4v c3 ar 4.38 1120 C 40 to +125c sc70 -3 mic803 - 41d4v c3 an 4.10 1120 C 40 to +125c sc70 -3 mic803 - 40d4v c3 a6 4.00 112 0 C 40 to +125c sc70 -3 mic803 - 31d4v c3 aj 3.08 1120 C 40 to +125c sc70 -3 mic803 - 30d4v c3 az 3.00 1120 C 40 to +125c sc70 -3 m ic803 - 29d4v c3 a3 2.93 1120 C 40 to +125c sc70 -3 mic803 - 26d4v c3 ac 2.63 1120 C 40 to +125c sc70 -3 mic803 - 46d2vm 3 as 4.63 20 C 40 to +125c sot23 -3 mic803 - 44d2vm 3 ap 4.38 20 C 40 to +125c sot23 -3 mic803 - 41d2vm 3 ak 4.10 20 C 40 to +125c sot23 -3 m ic803 - 40d2vm 3 a2 4.00 20 C 40 to +125c sot23 -3 mic803 - 31d2vm 3 ag 3.08 20 C 40 to +125c sot23 -3 mic803 - 30d2vm 3 av 3.00 20 C 40 to +125c sot23 -3 mic803 - 29d2vm 3 ad 2.93 20 C 40 to +125c sot23 -3 mic803 - 26d2vm 3 aa 2.63 20 C 40 to +125c sot23 -3 m ic803 - 46d3vm 3 at 4.63 140 C 40 to +125c sot23 -3 note: 1. all devices available in tape and reel only. (order entry pn, add tr. example: mic 803 - 26d4vm3 tr) standard/full reel quantity is 3,000 pieces. reel diameter is 7 inches. hub diameter is 2 inches. width is 8mm. 2. underbar symbol (_) may not be to scale. 3. C 40 to +85c temperature range. downloaded from: http:///
micrel, inc. mic803 august 3, 2015 3 revision 1.2 ordering information ( 1 ) (continued) part number marking ( 2 ) nominal v th (v) minimum t reset ( 3 ) (ms) junction temperature range package mic803 - 44d3vm 3 aq 4.38 140 C 40 to +1 25c sot23 -3 mic803 - 41d3vm 3 am 4.10 140 C 40 to +125c sot23 -3 mic803 - 40d3vm 3 a5 4.00 140 C 40 to +125c sot23 -3 mic803 - 31d3vm 3 a4 3.08 140 C 40 to +125c sot23 -3 mic803 - 30d3vm 3 ax 3.00 140 C 40 to +125c sot23 -3 mic803 - 29d3vm 3 ae 2.93 140 C 40 to +12 5c sot23 -3 mic803 - 26d3vm 3 ab 2.63 140 C 40 to +125c sot23 -3 mic803 - 46d4vm 3 au 4.63 1120 C 40 to +125c sot23 -3 mic803 - 44d4vm 3 ar 4.38 1120 C 40 to +125c sot23 -3 mic803 - 41d4vm 3 an 4.10 1120 C 40 to +125c sot23 -3 mic803 - 40d4vm 3 a6 4.00 1120 C 40 to +125c sot23 -3 mic803 - 31d4vm 3 aj 3.08 1120 C 40 to +125c sot23 -3 mic803 - 30d4vm 3 az 3.00 1120 C 40 to +125c sot23 -3 mic803 - 29d4vm 3 a3 2.93 1120 C 40 to +125c sot23 -3 mic803 - 26d4vm 3 ac 2.63 1120 C 40 to +125c sot23 -3 part numbering convention downloaded from: http:///
micrel, inc. mic803 august 3, 2015 4 revision 1.2 pin configuration 3- pin sc70 (top view) 3- pin sot - 23 (top view) pin description pin number pin name pin function 1 gnd ground pin . 2 /reset /reset goes low if v cc falls below the reset threshold (v th ), and remains asserted for one timeout per iod after v cc exceeds v th . 3 v cc power supply input and monitored voltage. downloaded from: http:///
micrel, inc. mic803 august 3, 2015 5 revision 1.2 absolute maximum ratings ( 4 ) supply voltage (v cc ) ...................................... C 0.3v to 6.0v reset output (/reset) .................................. C 0.3v to 6.0v input current (v cc ) ...................................................... 20ma outp ut current (/reset) ............................................ 20ma rate of rise (v cc ) ................................................... 100v/ s junction temperature (t j )....+150 c lead temperature (soldering, 10s) ............................ 260c storage temperature (t s ) ......................... C 65c to +150c esd rating ( 6 ) .................................................................. 3kv operating ratings ( 5 ) supply voltage (v cc ) ........................................ 1.0v to 5.5v reset output voltage (/reset) ...................... 0.0v to 5.5v junction temperature (t j ) ........................ C 40c to +125c junction thermal resistance 3- pin sc70 ( ja ) .............................................. 260c/w 3- pin sot - 23 ( ja ) ........................................... 203c/w electrical characteristics ( 7 ) for typical values, v cc = 5.0v for mic803 - 46/44/41/40, v cc = 3.3v for mic803 - 31/30/29, v cc = 3.0v for mic803 - 26; t j = 25c, bold values indicate C 40c t j +125c; unless no ted. parameter conditions min. typ. max. units power supply input operating voltage range (v cc ) t j = C 40 ? c to +85 ? c 1.0 5.5 v t j = C 40 ? c to +125 ? c 1.2 5.5 supply current ( i cc ) t j = C 40 ? c to +85 ? c v cc = 5.5v, no load 5 .5 15 a v cc = 3.6v, no loa d 4. 5 10 t j = +85 ? c to +125 ? c v cc = 5.5v, no load 18 v cc = 3.6v, no load 13 voltage threshold reset threshold (v th ) mic803 - 46 t j = C 40 ? c to +85 ? c 4.5 0 4.63 4.75 v t j = C 40 ? c to +125 ? c 4.44 4.82 mic803 - 44 t j = C 40 ? c to +85 ? c 4.25 4.38 4.50 t j = C 40 ? c to +125 ? c 4.20 4.56 mic803 - 41 t j = C 40 ? c to +85 ? c 4.00 4.10 4.20 t j = - 40 ? c to +125 ? c 3.97 4.24 mic803 - 40 t j = C 40 ? c to +85 ? c 3.89 4.00 4.10 t j = C 40 ? c to +125 ? c 3.80 4.20 mic803 - 31 t j = C 40 ? c to +85 ? c 3.00 3.08 3.1 5 t j = C 40 ? c to +125 ? c 2.95 3.21 notes: 4. exceeding the absolute maximum ratings may damage the device. 5. the device is not guaranteed to function outside its operating ratings. 6. devices are esd sensitive. handling precautions are recommended. human body model, 1.5k ? in series with 100pf. 7. specification for packaged product only. downloaded from: http:///
micrel, inc. mic803 august 3, 2015 6 revision 1.2 electrical characteristics ( 7 ) (continued) for typical values, v cc = 5.0v for mic803 - 46/44/41/40, v cc = 3.3v for mic803 - 31/30/29, v cc = 3.0v for mic803 - 26; t j = 25c, bold values indicate C 40c t j +125c; unless noted. parameter conditions min. typ. max. units voltage threshold (continued) reset threshold (v th ) mic803 - 30 t j = C 40 ? c to +85 ? c 2.93 3.00 3.08 v t j = C 40 ? c to +125 ? c 2.90 3.11 mic803 - 29 t j = C 40 ? c to +85 ? c 2.82 2.93 3.00 t j = C 40 ? c to +125 ? c 2.81 3.05 mic803 - 26 t j = C 40 ? c to +85 ? c 2.55 2.63 2.70 t j = C 40 ? c to +125 ? c 2.50 2.76 reset time v cc to /reset delay (t d ) v cc = v th to (v th C 100mv) 15 s reset timeout period (t reset ) d2 t j = C 40 ? c to +85 ? c 20 35 44 ms t j = C 40 ? c to +125 ? c 16 48 d3 t j = C 40 ? c to +85 ? c 140 230 36 0 t j = C 40 ? c to +125 ? c 112 420 d4 t j = C 40 ? c to +85 ? c 1120 1800 240 0 t j = C 40 ? c to +125 ? c 900 3200 reset outp ut /reset output voltage (v ol ) v cc 4.0v, i sink = 3.2ma 0.4 v v cc > 2.5v, i sink = 1.2ma 0.3 v v cc 1.0v, i sink = 50 a 0.3 v /reset output leakage v cc > v th , /reset deasserted 1 a downloaded from: http:///
micrel, inc. mic803 august 3, 2015 7 revision 1.2 typical characteristics v cc operating supply current vs. temperature 3 4 5 6 7 -50 -20 10 40 70 100 130 temperature ( c) supply current (a) v cc = 3.6v v cc to /reset delay vs. temperature 0 5 10 15 20 25 30 -50 -20 10 40 70 100 130 temperature ( c) v cc to /reset delay (s) v cc = v th to v th -100mv reset timeout period (d3) vs. temperature 200 220 240 260 280 300 -50 -20 10 40 70 100 130 temperature ( c) reset timeout period (ms) v cc = 5.5v normalized reset threshold vs. temperature 0.988 0.992 0.996 1.000 1.004 -50 -20 10 40 70 100 130 temperature ( c) normalized reset threshold (v) v cc operating supply current vs. supply voltage 0 2 4 6 8 0 1 2 3 4 5 6 supply voltage (v) supply current (a) v th = 2.93v maximum transient duration vs overdrive 0 10 20 30 40 50 0 200 400 600 800 1000 overdrive voltage, v th - v cc (mv) maximum transient duration (s) v th = 2.93v downloaded from: http:///
micrel, inc. mic803 august 3, 2015 8 revision 1.2 timing diagram v cc v th reset 0v v ol t reset t d t reset functional diagram reset generator v cc (3) gnd (1) reset (2) mic803 + - v th downloaded from: http:///
micrel, inc. mic803 august 3, 2015 9 revision 1.2 application information microprocessor reset the /reset pin is asserted whenever v cc falls below the reset threshold v oltage , v th . the /reset pin rema ins asserted for the duration of the reset timeout period (t reset ) after v cc has risen above the reset threshold voltage. the reset function ensures the microprocessor is properly reset and powers up in a known condition after a power failure. /reset will remain valid with v cc as low as 1.0v. the /reset output is a simple open - drain n - channel mosfet structure. a pull - up resistor must be used to pull this output up to some voltage. for most applications, this voltage will be the same power supply that suppli es v cc to the mic803. as shown in figure 1 , it is possible, however, to tie this resistor to some other voltage. this will allow the mic803 to monitor one voltage while level - shifting the /reset output to some other voltage. the pull - up voltage must be limited to 5.5v. the resistor must be small enough to supply current to the inputs and leakage paths that are driven by the /reset output. v cc 100k +3.3v reset v cc p mic803 gnd gnd reset +5v figure 1 . mic803 used i n a multiple supply system /reset valid at low voltage as v cc drops to 0v, the mic803 will no longer be able to pull the /reset output low, and the pull - up resistor will pull the output high. the value of the pull - up resistor and the voltage it is connected to will affect the point at which this happens. figure 2 . /reset at falling v cc wire oring the /reset output since the /reset output is open - drain, several reset sources can be wire - ored, in parallel, to allow resets from multiple sources. v cc transients the mic803 is relatively immune to negative - going v cc glitches below the reset threshold (s ee typical characteristics , graph titled maximum transient duration vs . overdrive ) . as s hown in figure 3 , the overdrive voltage is the difference between the threshold voltage and the minimum point of the v cc glitch. typically, an overdrive of 100mv, with duration of 15 s or less will not cause a reset. if additional transient immunity is needed, a 0.1 f bypass capacitor can be placed as close as possible to the mic803 on the v cc pin. figure 3 . v cc threshold downloaded from: http:///
micrel, inc. mic803 august 3, 2015 10 revision 1.2 package information and recommended landing pattern ( 8 ) 3-pin sc70 ( mm ) note: 8. package information is correct as of the publication date. for updates and most current information, go to www.micrel.com . downloaded from: http:///
micrel, inc. mic803 august 3, 2015 11 revision 1.2 packa ge information and recommended landing pattern ( 8 ) 3- pin sot - 23 (mm) downloaded from: http:///
micrel, inc. mic803 august 3, 2015 12 revision 1.2 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, inc. is a leading global manufacturer of ic solutions for the worldwide high pe rformance linear and power, lan, and timing & comm unications markets. the companys products include advanced mixed - signal, analog & power semiconductors; high - performance communication, clock management, mems - based clock oscillators & crystal - less clock generators, ethernet switch es, and physical layer transceiver ics. company customers include leading manufacturers of enterprise, consumer, industrial, mobile, telecomm unications, automotive, and computer produ cts. corporation headquarters and state - of - the - art wafer fabrication facilities are located in san jose, ca, with regional sales and support offices and advanced technology design centers situated throughout the americas, europe , and asia. additionally , the company maintains an extensive network of distributors and reps worldwide. micrel makes no representations or warranties with respect to the accuracy or completeness of the inf ormation 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 micrels terms and conditions of sale for such products, micrel assumes no liability whatsoever, and micrel disclaims any express or implied warranty relating to the sale and/or use of mi crel products including liability or warranties relating to fitness for a particular pu rpose, merchantability, or infringement of any patent, 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 malfunction of a product can reasonably be expected to result in personal injury. life support devices or systems are devices or sys tems that (a) are inte nded 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 significant injury to the user. a purchasers use or sale of micrel products for use in life support appliances, devices or s ystems is a purchasers own risk and purchaser agrees to fully indemnify micrel for any damages resulting from such use or sale. ? 20 10 micrel, incorporated. downloaded from: http:///

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