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____________ ____________________________________________________________ http://www.union - ic.com rev.0 7 a ug .20 1 5 1 / 1 7 u m706xs/um708xs /um813 x s supply voltage supervisor w/ watchdog input and manual reset u m 70 6 x s so p 8 u m708 x s so p 8 um813xs sop8 general description the um 706 xs / um 708 xs /um813xs series are cost effective system power supply supervisory circuits desi gned to monitor the power supplies in digital systems. the um 70 6 xs provide s power - supply monitoring circuitry that generate s a reset output during power - up, power - down, and brownout conditions. the reset output remains operational with v cc as low as 1v. i ndependent watchdog monitoring circuitry is also provided. this is activated if the watchdog input has not been toggled within 1.6 seconds. i n addition, there is a 1.25v threshold detector for power - fail warning, low battery detection, or to monitor an add itional power supply. a n active low debounced manual reset input is also include d. the um 708 xs is the same as the um 706 xs , except an active - high reset is substituted for t he watchdog timer. the um813xs is the same as the um706xs, except reset is provided instead of reset _____________ . all parts are available in a small outline sop8 package. applications features ? applications u sing dsps, microcontroller s or microproc e ssors ? p rogrammable c ontrols ? computers ? embedded s ystem s ? industrial e quipments ? intelligent i nstrument s ? wireless c ommunications s ystems ? wide o peration v oltage r ang e of 1v to 5.5 v ? correct l ogic o utput g uaranteed to v cc =1.0v ? precision supply - voltage monitor : 2. 63 v , 2.93v, 3.08 v , 4.38v, 4. 6 3v ? 20 0 ms reset pulse width ? independent watchdog timer - 1.6s timeout (um706 xs , um813xs ) ? a ctive - h igh reset o utput (um708 xs , um813xs ) ? voltage monitor for power - fail or low - battery warning ? temperature r ange: - 40c to + 85 c ? supply current of 80a (typ ) pin configurations top view um706x s xx : week code um706 xs sop8 1 2 3 4 5 6 7 8 m r v c c g n d p f i p f o w d i r e s e t w d o 1 2 3 4 5 6 7 8 u m 7 0 6 x s x x
____________ ____________________________________________________________ http://www.union - ic.com rev.0 7 a ug .20 1 5 2 / 1 7 u m706xs/um708xs /um813 x s pin configurations top view um70 8 xs xx: week code um708xs sop8 um813xs xx: week code um813xs sop8 ordering information part number top marking reset threshold (v) timeout period (ms) package type um706ls um70 6ls 4.63 240 sop8 um706ms um706ms 4.38 240 um706ts um706ts 3.08 240 um706ss um706ss 2.93 240 um706rs um706rs 2.63 240 um708ls um708ls 4.63 240 um708ms um708ms 4.38 240 um708ts um708ts 3.08 240 um708ss um708ss 2.93 240 um708rs um708rs 2.63 240 um813ls um813ls 4.63 240 um813ms um813ms 4.38 240 um813ts um813ts 3.08 240 um813ss um813ss 2.93 240 UM813RS UM813RS 2.63 240 1 2 3 4 5 6 7 8 m r v c c g n d p f i p f o n c r e s e t r e s e t 1 2 3 4 5 6 7 8 u m 7 0 8 x s x x 1 2 3 4 5 6 7 8 m r v c c g n d p f i p f o w d i r e s e t w d o 1 2 3 4 5 6 7 8 u m 8 1 3 x s x x
____________ ____________________________________________________________ http://www.union - ic.com rev.0 7 a ug .20 1 5 3 / 1 7 u m706xs/um708xs /um813 x s typical application circuit figure 1 . um706x s application circuit figure 2. um708 x s application circuit figure 3. um813xs application circuit u m 7 0 6 v c c p f i p f o m r w d o w d i r e s e t i n t n m i i / o r e s e t v c c p u s h b u t t o n s w i t c h v c c p u m 7 0 8 v c c p f i p f o m r r e s e t i n t r e s e t v c c p u s h b u t t o n s w i t c h v c c p r e s e t r e s e t u m 8 1 3 v c c p f i p f o m r w d o w d i r e s e t i n t n m i i / o r e s e t v c c p u s h b u t t o n s w i t c h v c c p
____________ ____________________________________________________________ http://www.union - ic.com rev.0 7 a ug .20 1 5 4 / 1 7 u m706xs/um708xs /um813 x s pin des cr iption pin number pin name function 1 mr _______ manua l - reset input triggers a reset pulse when pulled below 0.8v. this active - low input has an internal 250 a pull - up current. it can be driven from a ttl or cmos logic line as well as shorted to ground with a switch. 2 v cc supply input 3 gnd ground reference for all signals. 4 pfi power - fail voltage monitor input. when pfi is less than 1.25v, pfo _________ goe s low. connect pfi to gnd or v cc when not used. 5 pfo _________ power - fail output goes low and sinks current when pfi is les s than 1.25v; otherwise pfo _________ stays high. 6 um706 , um813 wdi watchdog input. if wdi remains either high or low for 1.6sec , the internal watchdog timer runs out and the wdo __________ goes low. floating wdi or connecting wdi to a high - impedance three - state buffer disables the watchdog feature. the internal watchdog timer clears whenever reset is asserted, wdi is three - stat ed, or wdi sees a rising or falling edge. um708 nc no connect 7 um706, um708 reset ______________ active - low reset output pulses low for 200ms when trigged, and stays low whenever v cc is b elow the reset threshold. it remains low for 200ms after v cc rises above the reset threshold or mr ________ goes from low to high. um813 reset active - high reset output is the inverse of reset ____________ . whenever reset is high, reset ____________ is low, and vice versa. 8 um706 , um813 wdo ___________ watchdog output pulls low when the internal watchdog timer finishes its 1.6sec count and does not go high again until the watchdog is cleared. wdo _ __________ also goes low during low - line conditions. whenever v cc is below the reset threshold, wdo ___________ stays low; however, unlike reset ______________ , wdo ___________ does not have a minimum pulse width. as soon as v cc rises above the reset threshold, wdo ___________ goes high with no delay. um708 reset active - high reset output is the inverse of reset ____________ . whenever reset is high, reset ____________ is low, and vice versa.
____________ ____________________________________________________________ http://www.union - ic.com rev.0 7 a ug .20 1 5 5 / 1 7 u m706xs/um708xs /um813 x s absolute maximum ratings (note 1) symbol parameter v alue u nit v cc supply voltage - 0.3 to + 6.0 v reset, reset ____________ ( p ush - p ull) - 0.3 to v cc +0.3 v i cc input current , v cc 20 ma i o output current , reset, reset ____________ 20 ma rate of rise, v cc 100 v/ d continuous power dissipation 471 mw t j operating junction temperature - 40 to +1 05 c t stg storage temperature range - 65 to +1 50 c lead temperature (soldering, 10s) 300 c note 1: stresses beyond those listed under absolute maximum ratings may cause permanent damage to the device. electrical characteristics v cc =full range, t a = - 40c to + 8 5c, unless otherwise noted. typical values are at t a =+25c, v cc = 5v for l/m versions, v cc =3.3v for t/s versions, and v cc =3v for r version . (note 2 ) symbol parameter conditions min typ max unit v cc v cc range t a =0 c to + 70 c 1.0 5.5 v t a = - 40 c to +8 5 c 1.2 5.5 i cc supply current t a = - 40 c to + 8 5 c 80 150 a v th reset threshold um 70 6 l / um708l /um813l t a =+25 c 4.5 3 4.63 4.7 3 v t a = - 40 c to + 85 c 4.50 4.75 um70 6 m / um708m /um813m t a =+25 c 4. 29 4.38 4.4 7 t a = - 40 c to + 85 c 4.25 4.50 um 70 6 t / um708t /um813t t a =+25 c 3.0 1 3.08 3.1 5 t a = - 40 c to +85 c 3.00 3.1 6 um 70 6 s / um708s /um813s t a =+25 c 2.8 7 2.93 2.9 9 t a = - 40 c to +85 c 2.85 3.00 um70 6 r / um708r /um813r t a =+25 c 2.5 7 2.63 2.6 9 t a = - 40 c to +85 c 2.55 2.70 reset threshold hysteresis 40 mv t rs r eset pulse width 140 200 280 ms note 2 : production testing done at t a =+25c; limits over temperature guaranteed by design only.
____________ ____________________________________________________________ http://www.union - ic.com rev.0 7 a ug .20 1 5 6 / 1 7 u m706xs/um708xs /um813 x s electrical characteristics (continued) v cc = full range, t a = - 40c to + 8 5c, unless otherwise noted. typical values are at t a =+25c, v cc = 5v for l/m versi ons, v cc =3.3v for t/s versions, and v cc =3v for r version . (note 2 ) symbol parameter conditions min typ max unit v ol reset / reset _____________ output voltage low i sink =1.2ma (for r/s/t versio ns) 0.3 v i sink =3.2ma (for l/m ve r sions) 0.4 v cc =1.2v, i sink =100 a 0.3 v oh reset / reset _____________ output voltage high i source =800 a v cc - 1.5 v mr _______ pull - up current mr _______ =0v 600 a t mr mr _______ pulse width 150 ns mr _______ input threshold, low 0.8 v mr _______ input threshold, high 2.0 v t md mr _______ to reset out delay 250 ns pfi input threshold v cc =5v 1.20 1.25 1.30 v pfi input current - 25 0.01 +25 na pfo ________ output voltage i source =800 a vcc - 1. 5 v i sink =3.2ma 0.4 watchdog f unction for um706 / um813 t wd watchdog timeout period 1.0 1.6 2.25 s t wp wdi pulse width v il =0.4v, v ih =0.8v cc 50 ns wdi input threshold low v cc =5v 0.8 v wdi input threshold high v cc =5v 3.5 v wdi input cur rent wdi=v cc 1 0 a wdi=0v - 1 0 wdo output voltage high i source =800 a vcc - 1.5 v wdo output voltage low i sink =1.2ma 0.4 v note 2 : production testing done at t a = +25c; limits over temperature guaranteed by design only.
____________ ____________________________________________________________ http://www.union - ic.com rev.0 7 a ug .20 1 5 7 / 1 7 u m706xs/um708xs /um813 x s block diagram figure 4 . um706 xs /um813xs block diagram (reset) * for um813xs figure 5 . um708 xs block diagram - + - + r e s e t g e n e r a t o r t i m e b a s e f o r r e s e t a n d w a t c h d o g w a t c h d o g t i m e r w a t c h d o g t r a n s i t i o n d e t e c t o r v c c 1 . 2 5 v 2 5 0 a 6 1 2 4 3 5 7 8 w d o r e s e t / ( r e s e t ) * p f o g n d p f i v c c m r w d i v r e f - + - + r e s e t g e n e r a t o r v c c 1 . 2 5 v 2 5 0 a 1 2 4 3 5 7 r e s e t r e s e t p f o g n d p f i v c c m r 8 v r e f
____________ ____________________________________________________________ http://www.union - ic.com rev.0 7 a ug .20 1 5 8 / 1 7 u m706xs/um708xs /um813 x s typical operating characteristics reset _______________ output voltage vs. supply voltage reset _______________ response time power - f ail compara tor assertion power - f ail comparator de - assertion response time response time (a) (b) (c) (d) v cc reset _____________ 2v/div 2v/div 500ms/div pfo ________ pfi 2v/div 1v/div 200ns/div pfo ________ pfi 2v/div 1v/div 200ns/div v cc reset _____________ 2v/div 2v/div 1 0 s/div - + 1 k 30 pf pfi + 5 v pfo + 1 . 25 v v cc gnd reset 2 k 330 pf v cc reset v cc gnd reset 10 k 30 pf v cc reset - + 1 k 30 pf pfi + 5 v pfo + 1 . 25 v
____________ ____________________________________________________________ http://www.union - ic.com rev.0 7 a ug .20 1 5 9 / 1 7 u m706xs/um708xs /um813 x s typical operating characteristics (continued) reset output voltage vs. supply voltage reset response time reset, reset ______________ assertion reset, reset ______________ de - assertion (e) (f) v cc reset 500ms /div reset reset _____________ 200ns/div reset reset _____________ 200ns/div v cc reset 2 0 s/div v cc gnd reset 10 k 330 pf v cc gnd reset 10 k 330 pf reset 10 k 330 pf
____________ ____________________________________________________________ http://www.union - ic.com rev.0 7 a ug .20 1 5 10 / 1 7 u m706xs/um708xs /um813 x s detailed descrip tion p ower - f ail reset the rese t output provides a reset signal to the microprocessor whenever the v cc input is below the threshold. an internal timer holds the reset output active for 200ms after the voltage on v cc rises above the threshold. this is inten ded as a power - on reset signal for the microprocessor. it allows time for both the power supply and the microprocessor to stabilize after power - up. if a power supply brownout or interruption occurs, the reset line is similarly activated and re mains active for 200ms after the supply recovers. if another interruption occurs during an active reset period, the reset timeout period continues for an additional 200ms. the reset output is guaranteed to remain valid with v cc as low as 1v. this ensures that the micro processor is held in a stable shutdown condition as the power supply starts up. the um706 xs provides an active low reset ______________ signal while the um813xs provides an active high reset s ignal . t he um708 xs has both an active high reset output and an active low reset _____________ outpu t . power - fail comparator t he power - fail comparator can be used for various purposes because its output and non - inverting input are not internally connected. t he inverting input is internally connected to a 1.25v reference. t o build an early - warning circuit for power failure, connect the pfi pin to a voltage driver, choose the voltage divider rati o so that the voltage at pfi falls below 1.25v just before the regulator drops out. use pfo ________ to interrupt the p so it can prepare for an orderly power - down. manual reset t he manual - r eset input ( mr _______ ) allows reset to be trigged by a pushbutton switch. t he switch is effectively d ebounced by the 140 ms minimum reset pulse width. mr _______ is ttl/cmos logic compatible, so it can be driven by an external logic line. if unused , mr _______ input can be tied high or left floating. watchdog timer th e um 70 6xs / um813xs watchdog circuit monitors the ps activity. if the p does not toggle the watchdog input (wdi) within 1.6sec and wdi is not three - stated, wdo __________ goes low. as long as reset _____________ is asserted or the wdi input is three - stated, the watchdog timer will stay cleared and will not count. as soon as reset is released and wdi is driven high or low, the timer will start counting. pulses as short as 50 ns can be detected. typically, wdo __________ will be connected to the non - maskable interrupt input (nmi) of a p. when v cc drops below the reset threshold, wdo __________ will go low whether or not the watchdog timer has timed out yet. normally this would trigger an nmi inte rrupt, but reset _____________ goes low simultaneously, and thus overrides the nmi interrupt. if wdi is left unconnected, wdo _________ _ can be used as a low - line output. since floating wdi disables the internal timer, wdo __________ goes low only when v cc falls below the reset threshold, thus functioning as a low - line output. the um 706 xs ha s a watchdog timer and a reset _____________ output. the um 708 xs ha s both active - high and active - low reset outputs. the um 813 xs has both an active - high reset output and a watchdog timer.
____________ ____________________________________________________________ http://www.union - ic.com rev.0 7 a ug .20 1 5 11 / 1 7 u m706xs/um708xs /um813 x s figure 6 . watchdog and reset timing figure 7 . reset, manual reset and watchdog timing w d i w d o r e s e t 0 v + 5 v 0 v + 5 v 0 v + 5 v t w p t w d t w d t r s t w d r e s e t e x t e r n a l l y t r i g g e r e d b y m r v c c 0 v + 5 v 0 v + 5 v 0 v + 5 v r e s e t m r w d o m r e x t e r n a l l y d r i v e n l o w v r t v r t t r s t r s t m d t m r
____________ ____________________________________________________________ http://www.union - ic.com rev.0 7 a ug .20 1 5 12 / 1 7 u m706xs/um708xs /um813 x s applications information valid reset ______________ below 1v v cc the um706 xs /um708 xs /um813xs are guaranteed to provide a valid reset level with v cc as low as 1v. when v cc falls below 1v, the internal transistor does not have sufficient drive to hold it on so the voltage on reset _____________ is no longer held at 0v. if a pull - down resistor is added to the reset _____________ pin as shown in figure 8 , any stray charge or leakage current will be drained to ground, holding reset _____________ low. resistor value (r1) is not critical. it should be about 100k, large enough not to load reset _____________ and small enough to pull reset _____________ to ground. monitoring additional supply levels it is possible to use the power - fail comparator to monitor a second supply as shown in f igure 9 . the two sensing resistors, r1 and r2, are selected such that the voltage on pfi drops below 1.25v at the minimum acceptable input supply. the pfo ________ output can be connected to the mr _______ input so that a reset is generated when the supply drops out of tolerance. in this case, if either supply drops out of tolerance, a reset is generated. monitoring a negative voltage the power - fail comparator can also monitor a negative supply rail (figure 10 ). when the negative rail is good (a negative voltage of large magnitude), pfo ________ is low, and when the negative rail is degraded (a negative voltage of lesser magnitude), pfo ________ is high. by adding the resistors and transistor as shown, a high pfo ________ triggers reset . as long as pfo ________ remains high, theum 706 xs /um 708 xs /um813xs will keep reset asserted ( reset _____________ =low, reset = high). note that this circuits accuracy depends on the pfi threshold tolerance, the v cc line, and the resistors. microprocessor with bidirectional re set to prevent contention for microprocessors with a bidirectional reset line, a current limiting resistor is to be inserted between the reset _____________ output pin and the microprocessor reset pin. this limits the current to a safe level if there are conflicting output reset levels. a suitable resistor value is 4.7k . i f the reset output is required for other uses, it should b e buffered as shown in f igure 11 .
____________ ____________________________________________________________ http://www.union - ic.com rev.0 7 a ug .20 1 5 13 / 1 7 u m706xs/um708xs /um813 x s figure 8 . reset v alid to ground circuit figure 9 . monitoring an additional supply v x figure 10 . monitoring a negative voltage figure 1 1 . bidirectional reset i/o v x + 5 v v c c p f i g n d p f o m r r e s e t r 1 r 2 t o p + 5 v p f i v c c g n d m r p f o r e s e t r 1 r 2 t o p v - 1 0 0 k 1 0 0 k 2 n 3 9 0 4 m r p f o + 5 v + 5 v 0 v 0 v 0 v v - v t r i p 5 - 1 . 2 5 r 1 = 1 . 2 5 - v t r i p r 2 , v t r i p 0 v cc gnd reset v cc gnd reset p 4 . 7 k buffered reset to other system components v cc gnd reset r 1
____________ ____________________________________________________________ http://www.union - ic.com rev.0 7 a ug .20 1 5 14 / 1 7 u m706xs/um708xs /um813 x s package information um70 6 x s so p 8 ou tline drawing dimensions symbol millimeters inches min max min max a 1.350 1.750 0.053 0.069 a1 0.100 0.250 0.004 0.010 a2 1.350 1.550 0.053 0.061 b 0.33 0.51 0.013 0.020 c 0.170 0.250 0.006 0.010 d 4.700 5.100 0.185 0.200 e 3.800 4.000 0.150 0.157 e1 5.800 6.200 0.228 0.244 e 1.270 (bsc) 0.050 (bsc) l 0.400 1.270 0.016 0.050 0 8 0 8 land pattern notes: 1. compound dimension: 4.90 3.90 ; 2. unit: mm; 3. general to lerance 0.05mm unless otherwise specified; 4. the layout is just for reference. tape and reel orientation d e 1 e e 1 2 t o p v i e w l c e n d v i e w a 2 b a 1 a s i d e v i e w 4 . 9 5 1 . 3 0 1 . 2 7 0 . 5 0 u m 7 0 6 x s x x
____________ ____________________________________________________________ http://www.union - ic.com rev.0 7 a ug .20 1 5 15 / 1 7 u m706xs/um708xs /um813 x s um70 8xs sop8 outline drawing dimensions symbol millimeters inches min max min max a 1.350 1.750 0.053 0.069 a1 0.100 0.250 0.004 0.010 a2 1.350 1.550 0.053 0.061 b 0.33 0.51 0.013 0.020 c 0.170 0.250 0.006 0.010 d 4.700 5.100 0.185 0.200 e 3.800 4.000 0.150 0.157 e1 5.800 6.200 0.228 0.244 e 1.270 (bsc) 0.050 (bsc) l 0.400 1.270 0.016 0.050 0 8 0 8 land pattern notes: 1. compound dimension: 4.903.90 ; 2. unit: mm; 3. general tolerance 0.05mm unless otherwise specified; 4. the layout is just for reference. tape and reel orientation d e 1 e e 1 2 t o p v i e w l c e n d v i e w a 2 b a 1 a s i d e v i e w 4 . 9 5 1 . 3 0 1 . 2 7 0 . 5 0 u m 7 0 8 x s x x
____________ ____________________________________________________________ http://www.union - ic.com rev.0 7 a ug .20 1 5 16 / 1 7 u m706xs/um708xs /um813 x s um 813xs sop8 outline drawing dimensions symbol millimeters inches min max min max a 1.350 1.750 0.053 0.069 a1 0.100 0.250 0.004 0.010 a2 1.350 1.550 0.053 0.061 b 0.33 0 .51 0.013 0.020 c 0.170 0.250 0.006 0.010 d 4.700 5.100 0.185 0.200 e 3.800 4.000 0.150 0.157 e1 5.800 6.200 0.228 0.244 e 1.270 (bsc) 0.050 (bsc) l 0.400 1.270 0.016 0.050 0 8 0 8 land pattern notes: 1. compound dimension: 4.903.90 ; 2. unit: mm; 3. general tolerance 0.05mm unless otherwise specified; 4. the layout is just for reference. tape and reel orientation d e 1 e e 1 2 t o p v i e w l c e n d v i e w a 2 b a 1 a s i d e v i e w 4 . 9 5 1 . 3 0 1 . 2 7 0 . 5 0 u m 8 1 3 x s x x
____________ ____________________________________________________________ http://www.union - ic.com rev.0 7 a ug .20 1 5 17 / 1 7 u m706xs/um708xs /um813 x s green compliance union semiconductor is committed to environmental excellence in all aspects of its operations including meeting or exceeding regulatory requirements with respect to the use of hazardous substances. numerous succ essful programs have been implemented to reduce the use of hazardous substances and/or emissions. all union components are compliant with the rohs directive, which helps to support customers in their compliance with environmental directives. for more green compliance information, please visit: http://www.union - ic.com/index.aspx?cat_code=rohsdeclaration important notice the information in this document has been carefully reviewed and is believed to be accurate. nonetheless, this document is subject to change without notice. union assumes no responsibility for any inaccuracies that may be contained in this document, and makes no commitment to update or to keep current the contained information, or to notify a person or organization of any update. union reserves the right to make changes, at any time, in order to improve reliability, function or design and to attempt to supply the best product possible. union semiconductor, inc add: unit 606, no.570 shengxia road, shanghai 2012 10 tel: 021 - 5109 3966 fax: 021 - 51026018 website: www.union - ic.com

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