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ame, inc. 1 ame8510 / 8520 / 8530 micropower m m m m m p watch dog timer l small packages: sot-25 l 7 voltage threshold options l tight voltage threshold tolerance --- 1.50% l 12 output driver configuration options l wide temperature range -------- -40 o c to 85 o c l low temperature coefficient --- 100ppm/ o (max) l low quiescent current < 3.0 m a l 3 bonding options the ame8510/8520/8530 family allows the user to cus- tomize the cpu monitoring function without any external components. the user has a large choice of reset volt- age thresholds and output driver configurations, all of which are preset at the factory. each wafer is trimmed to the customer's specifications. these circuits will ignore fast negative going transients on v dd . the state of the reset output is guaranteed to be correct down to 1v. after v dd crosses above a factory preset threshold, the ame8510/8520/8530 assert a reset signal. after a predetermined time (the reset interval) the reset is deasserted. if v dd ever drops below the threshold voltage a reset is asserted immediately. in addition to a supply monitoring function the ame8510/8520 also monitor tran- sitions at the watch dog (wdi) input. if a logic transition does not occur at the wdi pin within a certain time inter- val (the watchdog interval) then a reset is asserted. the reset deasserts after the reset interval, as explained ear- lier. the ame8510/8530 can both assert a reset manually by pulling the mrb input to ground. space saving sot-25 packages and micropower qui- escent current make this family a natural for portable battery powered equipment. n general description n features l motherboards l computer peripherals l portable electronics l applications using cpus l consumer electronics n applications n pin configuration ame8510 1. reset/resetb 2. gnd 3. mrb 4. wdi 5. v dd sot-25 top view 13 2 5 4 ame8510 sot-25 top view ame8520 1. reset/resetb 2. gnd 3. resetb/reset 4. wdi 5. v dd 13 2 5 4 ame8520 sot-25 top view ame8530 1. reset/resetb 2. gnd 3. resetb/reset 4. mrb 5. v dd 13 2 5 4 ame8530
ame, inc. 2 micropower m m m m m p watch dog timer ame8510 / 8520 / 8530 ame8510 ame8520 ame8530 111 reset/ resetb this pin may be either reset or resetb. resetb is active low. in the case of the ame8520 and ame8530 this pin will always be the opposite polarity from pin 3. this pin can be push/pull or open drain. 222gndground n/a 3 3 reset/ resetb this pin may be either resetb or reset. reset is active high. in the case of the ame8520 and ame8530 this pin will always be the opposite polarity from pin 1. this pin can be either push/pull or open drain. 3n/a4 mrb manual reset. active low. pulling this pin low forces a reset. after a low to high transition reset remains asserted for exactly one reset timeout period. this pin is internally pulled high. if this function is unused then float this pin or tie it to v dd . 4 4 n/a wdi watch dog input. any transition on this pin will reset the watch dog timer. if this pin remains high or low for longer than the watch dog interval then a reset is asserted. float or tristate this pin to disable the watch dog feature. 555 v dd positive power supply. a reset is asserted after this voltage drops below a predetermined level. after v dd rises above that level reset remains asserted until the end of the reset timeout period. pin name pin description pin # n pin description
ame, inc. 3 ame8510 / 8520 / 8530 micropower m m m m m p watch dog timer n ordering information operating temperature range number of pins package type pin configuration special feature ame8510 x x x x x x x x output driver option reset time (t d2nom ) vdd threshold voltage (v th ) a: 1. reset/ e: -40 o c to 85 o c e: sot-2x v: 5 f: t d = 210ms e: 1760 ms 22: vth= 2.19v l: low profile resetb a: resetb/pp x: 23: vth= 2.32v y: lead free & 2. gnd b: resetb/od 26: vth= 2.63v low profile 3. mrb c: reset/pp 29: vth= 2.93v z: lead free 4. wdi d: reset/od 31: vth= 3.08v 5. vdd e: resetb/pp 44: vth= 4.38v f: resetb/pp 46: vth= 4.63v g : resetb/od h: resetb/od i: reset/pp j: reset/pp k: reset/od l: reset/od e: reset/pp f: reset/od g : reset/pp h: reset/od i: resetb/pp j: resetb/od k: resetb/pp l: resetb/od (reset = active hig h) (resetb = active low) (pp = push pull out) special feature pin1 pin3 package type number of pins wach dog interval without wdi option (od = open drain output polarity) pin configuration operating temperature range reset time (t d2nom ) vdd threshold voltage (v th ) output driver option
ame, inc. 4 micropower m m m m m p watch dog timer ame8510 / 8520 / 8530 n ordering information operating temperature range number of pins package type pin configuration special feature ame8520 x x x x x x x x output driver option reset time (t d2nom ) vdd threshold voltage (v th ) a: 1. reset/ e: -40 o c to 85 o c e: sot-2x v: 5 f: t d = 210ms e: 1760 ms 22: vth= 2.19v l: low profile resetb a: resetb/pp x: 23: vth= 2.32v y: lead free & 2. gnd b: resetb/od 26: vth= 2.63v low profile 3. reset/ c: reset/pp 29: vth= 2.93v z: lead free resetb d: reset/od 31: vth= 3.08v 4. wdi e: resetb/pp 44: vth= 4.38v 5. vdd f: resetb/pp 46: vth= 4.63v g : resetb/od h: resetb/od i: reset/pp j: reset/pp k: reset/od l: reset/od e: reset/pp f: reset/od g : reset/pp h: reset/od i: resetb/pp j: resetb/od k: resetb/pp l: resetb/od (reset = a ct ive hig h) (resetb = a ct ive lo w) (pp = push p ull o ut ) pin configuration operating temperature range reset time (t d2nom ) vdd threshold voltage (v th ) output driver option special feature pin1 pin3 package type number of pins watch dog interval without wdi option (od = op en d rain o ut p ut p o larit y)
ame, inc. 5 ame8510 / 8520 / 8530 micropower m m m m m p watch dog timer n ordering information operating temperature range number of pins package type pin configuration special feature ame8530 x x x x x x x x output driver option reset time (t d2nom ) vdd threshold voltage (v th ) a: 1. reset/ e: -40 o c to 85 o c e: sot-2x v: 5 f: t d = 210ms e: 1760 ms 22: vth= 2.19v l: low profile resetb a: resetb/pp x: 23: vth= 2.32v y: lead free & 2. gnd b: resetb/od 26: vth= 2.63v low profile 3. reset/ c: reset/pp 29: vth= 2.93v z: lead free resetb d: reset/od 31: vth= 3.08v 4. mrb e: resetb/pp 44: vth= 4.38v 5. vdd f: resetb/pp 46: vth= 4.63v g : resetb/od h: resetb/od i: reset/pp j: reset/pp k: reset/od l: reset/od e: reset/pp f: reset/od g : reset/pp h: reset/od i: resetb/pp j: resetb/od k: resetb/pp l: resetb/od (reset = a ct ive hig h) (resetb = a ct ive lo w) (pp = push p ull o ut ) pin configuration operating temperature range reset time (t d2nom ) vdd threshold voltage (v th ) output driver option number of pins special feature pin1 pin3 package type watch dog interval without wdi option (od = op en d rain o ut p ut p o larit y)
ame, inc. 6 micropower m m m m m p watch dog timer ame8510 / 8520 / 8530 n ordering information part number marking v th voltage package operating temp. range ame8510aeevafe26 atgww 2.63v sot-25 - 40 o c to + 85 o c ame8510aeevafe29 atxww 2.93v sot-25 - 40 o c to + 85 o c AME8510AEEVAFE31 asmww 3.08v sot-25 - 40 o c to + 85 o c ame8510aeevbdd29 arxww 2.93v sot-25 - 40 o c to + 85 o c ame8510aeevefe31 atuww 3.08v sot-25 - 40 o c to + 85 o c ame8520aeevefe26 atcww 2.63v sot-25 - 40 o c to + 85 o c ame8520aeevefe29 atvww 2.93v sot-25 - 40 o c to + 85 o c ame8520aeevefe31 atlww 3.08v sot-25 - 40 o c to + 85 o c ame8520aeevefe44 atwww 4.38v sot-25 - 40 o c to + 85 o c ame8530aeevafx29 aveww 2.93v sot-25 - 40 o c to + 85 o c ame8530aeevafx31 avfww 3.08v sot-25 - 40 o c to + 85 o c ame8530aeevefx29 ausww 2.93v sot-25 - 40 o c to + 85 o c ame8530aeevefx29z ausww 2.93v sot-25 - 40 o c to + 85 o c ame8530aeevefx31 atnww 3.08v sot-25 - 40 o c to + 85 o c please consult ame sales office or authorized rep./distributor for other reset time interval and watch dog time interval.
ame, inc. 7 ame8510 / 8520 / 8530 micropower m m m m m p watch dog timer parameter rating unit supply voltage 0.9 - 5 v ambient temperature range - 40 to + 85 o c junction temperature - 40 to + 125 o c n absolute maximum ratings n recommended operating conditions n thermal information caution: stress above the listed absolute maximum rating may cause permanent damage to the device parameter maximum unit supply voltage 6 v esd classification b maximum unit 256 o c / w 150 o c 300 o c thermal resistance (sot-25) maximum junction temperature parameter maximum lead temperature (10 sec)
ame, inc. 8 micropower m m m m m p watch dog timer ame8510 / 8520 / 8530 parameter symbol min typ max units v dd range v range 15.5v supply current i dd 310.0 m a reset threshold* v th v th -1.5% v th +1.5% v resetb output voltage hgh v dd >v th max reset output voltage hgh v dd v th max v dd to reset delay t d1 v dd = v th - 100mv 40 m s reset timeout period* t d2 ta= -40~ 85 o c version f 140 210 280 ms watch dog timeout period* t wd 1120 1760 2400 ms wdi pulse width t wdi 50 ns wdi il 0.7 v wdi ih 0.8 v dd v i il -15 -8 i ih 815 mrb il 0.7 mrb ih 0.8 v dd mrb pulse width t wmrb 1 m s mrb noise immunity (pulse width with no reset) 100 ns mrb to reset delay t dmrb 500 ns mrb pull up resistance 80 120 k ohm test condition wdi input threshold wdi input current wdi and mrb unconnected v v ol 0.5 v v oh i source =0.5ma, ta= -40~ 85 o c 0.8v dd version e i snk =1.2ma, ta= -40~ 85 o c v dd = v th x 1.2 wdi = 0v m a mrb input threshold v v dd = v th x 1.2 wdi = v dd = 5.0v n electrical specifications ta = 25 o c unless otherwise noted * see the chart on page 3 for available values of this parameter.
ame, inc. 9 ame8510 / 8520 / 8530 micropower m m m m m p watch dog timer n detailed description the ame8510/8520/8530 are designed to interface with the reset input of a microprocessor and to prevent cpu execution errors due to power up, power down, and other power supply errors. the ame8510/8520 also monitor the cpu health by checking for signal transitions from the cpu at the wdi input. reset output each output pin in the family can be configured to be either push/pull or open drain. in addition each output may be either active high or active low with the condition that parts with two outputs must have opposite polari- ties. active high reset outputs are denoted as reset. active low reset outputs are denoted as resetb. the selection guide on page 3 of this data sheet shows all possible combinations of output driver configuration. a reset will be asserted if any of three things happen: 1) v dd drops below the threshold (v th ) 2) the mrb pin is pulled low. 3) the wdi pin does not detect a transition within the watch dog interval (t wd ). the reset will remain asserted for the prescribed reset interval after: 1) v dd rises above the threshold (v th ) 2) mrb goes high 3) the watch dog timer has timed out causing the reset to assert. manual reset input the ame8510 and ame8530 feature a manual reset feature (mrb). a logic low on the mrb pin asserts a reset. the reset remains asserted as long as the mrb pin remains low. after the mrb pin transitions to a high state the reset remains asserted for the prescribed reset interval (t d2 ). the mrb pin is internally pulled up to vdd by a 100k w resistor. it is internally debounced to reject switching transients. the mrb pin is esd protected by diodes connected to v dd and gnd. so the mrb pin should never be driven higher than v dd or lower than gnd. watchdog input the ame8510 and ame8520 are equipped with a watch- dog input (wdi). if the microprocessor does not produce a valid logic edge at the the watchdog input (wdi) within the prescribed watchdog interval (t wd ) then a reset as- serts. the reset remains asserted for the required reset interval (t d2 ) at the end of the reset interval the reset is deasserted and the watchdog interval timer starts again from zero. if the watchdog input is left unconnected or is con- nected to a tri-stated buffer the watchdog function is dis- abled. as soon as the wdi input is driven either low or high the watchdog function resumes with the watchdog timer set to zero. reset timing diagram wdi resetb vdd v th t wd t d2 t d2 watchdog timing diagram v dd resetb reset t d2 v release v th t d1 t d2 t d1 50% 50% 50% 50%
ame, inc. 10 micropower m m m m m p watch dog timer ame8510 / 8520 / 8530 n detailed description(contd.) watchdog input current the watchdog input pin (wdi) typically sources/sinks 8 m a when driven high or low. so from a power dissipa- tion point of view the duty cycle of the waveform at wdi is unimportant. when the wdi pin is floating or tri-stated the power supply current falls to less than 3.0 m a. glitch rejection the ame8510/8520/8530 family will reject negative go- ing transients on the v dd line to some extent. the smaller the duration of the transient the larger its amplitude may be without triggering a reset. the glitch rejection chart in the graphs section of this datasheet shows the rela- tion between glitch amplitude and allowable glitch dura- tion to avoid unintended resets. accurate output state at low v dd with v dd voltage on the order of the mos transistor threshold (<1.0v) the outputs of the ame8510/8520/8530 may become undefined. for parts with active low output (resetb) a resistor placed between resetb and gnd on the order of 100k w will ensure that the resetb out- put stays low when v dd is lower than the threshold volt- age of the part. in a like manner a resistor on the order of 100k w when placed between reset and v dd will en- sure parts with active high output (reset) will remain high when v dd is lower than the threshold voltage of the part.
ame, inc. 11 ame8510 / 8520 / 8530 micropower m m m m m p watch dog timer reset time vs. temperature i dd vs. temperature reset v th vs. temperature glitch rejection reset vol vs. temperature glitch duration ( m m m m s) glitch amplitude (v) 0 20 40 60 80 100 120 140 0.01 0.1 1 reset time (ms) 190 195 200 205 210 215 220 -45 -5 25 55 85 115 temperature ( o c) v th =2.63v supply current @ 5v (ua) temperature ( o c) 2.10 2.15 2.20 2.25 2.30 2.35 -45 -5 25 55 85 115 v th =2.63v 2.630 2.632 2.634 2.636 2.638 2.640 2.642 2.644 2.646 2.648 2.650 -45 -5 25 55 85 115 reset vth (v) temperature ( o c) v th =2.63v 0.220 0.225 0.230 0.235 0.240 0.245 0.250 0.255 0.260 0.265 -45 -5 25 55 85 115 reset vol @ 0.8ma (v) temperature ( o c) v th =2.63v
ame, inc. 12 micropower m m m m m p watch dog timer ame8510 / 8520 / 8530 n package dimension sot-25 min max min max a a 1 0.00 0.15 0.0000 0.0059 b 0.30 0.55 0.0118 0.0217 d 2.70 3.10 0.1063 0.1220 e 1.40 1.80 0.0551 0.0709 e h 2.60 3.00 0.10236 0.11811 l 1 0 o 10 o 0 o 10 o s 1 1.90 bsc 0.07480 bsc symbols millimeters inches 1.20ref 0.0472ref 0.37bsc 0.0146bsc 0.95bsc 0.0374bsc l top view side view front view c 1 d s1 e e h a1 b a
life support policy: these products of ame, inc. are not authorized for use as critical components in life-support devices or systems, without the express written approval of the president of ame, inc. ame, inc. reserves the right to make changes in the circuitry and specifications of its devices and advises its customers to obtain the latest version of relevant information. ? ame, inc. , june 2003 document: 2007-ds8510/8520/8530-c corporate headquarter u.s.a. subsidiary ame, inc. analog microelectronics, inc. 2f, 189 kang-chien road, nei-hu dist. 3100 de la cruz blvd. suite 201 taipei 114 taiwan, r.o.c. santa clara, ca. 95054-2046 tel: 886 2 2627-8687 tel : (408) 988-2388 fax: 886 2 2659-2989 fax: (408) 988-2489 www.ame.com.tw e-mail: sales@ame.com.tw

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