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_______________________________________ _________________________________ http://www.union - ic.com rev.0 1 jan .20 15 1 / 1 7 u m807/821/822 p reset circuits with long manual reset setup period um80 7 /8 2 1/8 22 sot143 general description the um 8 0 7 /8 2 1/8 2 2 are low - power microprocessor (p) supervisory circuits used to monitor power supplies in p and digital systems. t hey provide excellent circuit reliability and low cost by eliminating external components and adjustments when used with 5v - powered or 3v - powered circuits. the um80 7 / 8 2 1/8 2 2 also provide a debounced manual reset input with long setup period. on all devices , the reset output asserts when the v cc supply voltage drops below its specified threshold. the reset output remains asserted for the reset t imeout period (2 4 0ms typ) after v cc rise s above the reset threshold . the reset output is one - shot pulse asserted fo r the reset timeout period (140ms min) when manual reset input is held low for a fixed setup timeout period. these devices ignore manual reset transitions of less than the fixed setup timeout period. the um807 ha s an active - low reset _____________ with open - drain output , the um821 has an active - low reset _____________ with push - pull output, and the um822 has an active - high reset wi th push - pull output . these devices, offered in small sot 143 package , are fully guaranteed over the extended temperature range ( - 40c to +85c). applications features ? set - top boxes ? consumer electronics ? dvd players ? cable/dsl modems ? mp3 players ? industri al equipments ? automotive ? medical devices ? no external components ? v cc transient immunity ? correct logic output guaranteed to v cc =1.0v ? precision v cc monitoring of 3.0v, 3.3v and 5.0v s upplies ? 2 a supply current ? 140ms minimum power - on reset pulse width ? available in 3 manual reset setup period s (t mr ) : a: 10.08 s b: 6.72 s c: 1.68 s ? available in 3 output configurations: open - drain active - low reset __________ output(um80 7 ) ; push - pull active - low reset __________ output(um8 2 1) push - pull active - high r eset output(um8 2 2 ) ? 4 - pin sot143 package ? wide operation temperature: - 40 c to +85 c
_______________________________________ _________________________________ http://www.union - ic.com rev.0 1 jan .20 15 2 / 1 7 u m807/821/822 pin configurations top view ordering information um8 xx z t p xx: output type =0 7 open - d rain active low = 2 1 p ush - p ull active low = 2 2 push - p ull active high z: reset threshold (v) =l 4.63 =m 4.38 =j 4.00 =t 3.08 =s 2.93 =r 2.63 =z 2.32 t: manual reset setup period (s) =a 10.08 =b 6.72 =c 1.68 p: package type = e sot143 ( ) are for um8 2 2 m: month code um 80 7 / 8 2 1 /8 2 2 sot143 1 2 3 4 g n d r e s e t ( r e s e t ) m r v c c 1 2 3 4 m x x x
_______________________________________ _________________________________ http://www.union - ic.com rev.0 1 jan .20 15 3 / 1 7 u m807/821/822 typical operating circ uit v c c u m 8 0 7 u m 8 2 1 u m 8 2 2 g n d r e s e t ( r e s e t ) v c c g n d r e s e t + 3 . 3 v m r p r p u l l u p * * u m 8 0 7 o n l y ( ) a r e f o r u m 8 2 2 m r r e s e t m r s e t u p p e r i o d t m r r e s e t p u l s e w i d t h 2 4 0 m s r e s e t t p w
_______________________________________ _________________________________ http://www.union - ic.com rev.0 1 jan .20 15 4 / 1 7 u m807/821/822 pin description pin number pin name function 1 gnd ground 2 reset ______________ (um80 7 /8 2 1) acti ve - low p ush - pull or op en - drain output. reset ______________ changes from high to low when v cc drops below its reset threshold and remains low for the 2 4 0ms reset timeout period after v cc exceed s their reset threshold. reset ______________ i s one - shot pulsed low for the reset timeout p er iod (140ms min) after the manual reset input is asserted longer than the specified setup peri od . for the open - drain output, use a p ul l - up resistor to v cc . see figure 1. reset (um8 2 2) acti ve - high p ush - pull output. reset changes from low to high when v cc drops below its reset threshold and remains high for the 2 4 0ms reset timeout period after v cc exceed s their reset threshold. reset i s one - shot pulsed high for the reset timeout p er iod (140ms min) after the manual reset input is asserted longer than the specified setup peri od . see figure 1. 3 mr _______ manual reset input, active low. internal 22 k pull - up to v cc . pull mr _______ low for the typical input pulse width (t mr ) to one - shot pulse reset _____________ for the r eset pulse width (t pw ) . see figure 2 . 4 v cc +5v, +3.3v, or +3v supply voltage absolute maximum ratings (note 1) s ymbol p arameter v alue u nit v cc supply voltage - 0.3 to +6.0 v reset, reset ______ _______ (push - pull) - 0.3 to (v cc +0.3) reset _____________ (open - drain) - 0.3 to +6.0 mr _______ - 0.3 to +6.0 i cc input current, v cc , mr _______ 20 ma i o output current, reset, reset _____________ 20 ma p d continuous power dissipation ( der ate 4mw/c above 70c ) 320 mw t a operating temperature range - 40 to +105 c t stg storage temperature range - 65 to + 1 60 c lead temperature (soldering, 10s) +300 c note 1: stresses beyond those listed under absolute maximum ratings may cause perman ent damage to the device. these are stress ratings only and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications are not implied. exposure to absolute maximum rating co nditions for extended periods may affect device reliability.
_______________________________________ _________________________________ http://www.union - ic.com rev.0 1 jan .20 15 5 / 1 7 u m807/821/822 electrical characteristics (v cc = 5v for l/m/j versions, v cc = 3.3v for t/s versions, v cc = 3v for r version, and v cc = 2.5v for z version, t a = - 40c to +85c, unless otherwise noted. typical v alues are at t a = +25c.) (note 2 ) symbol parameter conditions min typ max unit v cc supply voltage range 1.0 5.5 v i cc supply current 2.0 5.0 a v th+ reset threshold l version t a =+25 4.5 6 4.63 4.7 0 v t a = - 40 to + 85 4.50 4.75 m version t a =+25 4.31 4.38 4.45 t a = - 40 to + 85 4.25 4.50 j version t a =+25 3.93 4.00 4.06 t a = - 40 to + 85 3.89 4.10 t version t a =+25 3.04 3.08 3.11 t a = - 40 to + 85 3.00 3.15 s version t a =+25 2.89 2.93 2.96 t a = - 40 to + 85 2. 85 3.00 r version t a =+25 2.59 2.63 2.66 t a = - 40 to + 85 2.55 2.70 z version t a =+25 2.28 2.32 2.35 t a = - 40 to + 85 2.25 2.38 reset threshold tempco 150 ppm/ c t rd v cc to reset delay (note 3) 1 0 s t rp reset active timeout period 140 240 560 ms t mr mr ______ minimum pulse width a 6.04 10.08 14.11 s b 4.03 6.72 9.41 c 1.01 1.68 2.35 t pw reset pulse width 140 240 560 ms mr ______ glitch immunity (note 4) 100 ns v ih mr ______ input threshold v cc > v th (max) um80 7 /8 2 1/8 2 2l _ e /m _ e /j _ e 2.3 v v il 0.8 v ih v cc > v th (max) um80 7 /8 2 1/ 82 2t _ e /s _ e /r _ e /z _ e 0.7v cc v il 0.25v cc mr ______ pull - up resistance 10 20 30 k
_______________________________________ _________________________________ http://www.union - ic.com rev.0 1 jan .20 15 6 / 1 7 u m807/821/822 electrical characteristics (continued) (v cc = 5v for l/m/j versions, v cc = 3.3v for t/s versi ons, v cc = 3v for r version, and v cc = 2.5v for z version, t a = - 40c to +85c, unless otherwise noted. typical values are at t a = +25c.) (note 2 ) symbol parameter conditions min typ max unit v oh reset output voltage i source =150a, 1.8vv th(max) um8 2 1t _e /s _e /r _e /z _e 0.8v cc v i source =800a, v cc >v th(max) um8 2 1l _e /m _e /j _e v cc - 1.5 v ol i sink =1.2ma, v cc =v th(min) um80 7 /8 2 1t _e /s _e /r _e /z _e 0.3 i sink =3.2ma, v cc =v th(min) um80 7 /8 2 1l _e /m _e /j _e 0.4 i sink =50a, v cc >1.0v 0.3 note 2 : production testing done at t a = +25c; limits over temperature g uaranteed by design only. note 3 : reset _____________ output for um 80 7 /8 2 1 ; reset output for um 8 2 2 . note 4 : glitches of 100n s or less typically will not generate a reset pulse.
_______________________________________ _________________________________ http://www.union - ic.com rev.0 1 jan .20 15 7 / 1 7 u m807/821/822 typical operating characteristics (t a = +25c , unless otherwise noted .) vcc=3.3v supply current vs. temperature (um8 2 1 r _ e ) power - down reset delay vs. temperature (um8 2 1r _ e ) power - up reset timeout vs. temperature
_______________________________________ _________________________________ http://www.union - ic.com rev.0 1 jan .20 15 8 / 1 7 u m807/821/822 detailed description reset timing the reset signal is asserted low for the um 8 2 1 and high for the um 8 2 2 w hen the power supply voltage falls below the threshold trip voltage and remains asserted for at least 140ms after the power supply voltage has risen above the threshold. figure 1 . reset vs. v cc timing diagram pull mr _______ low for the typical input pulse width (t mr ) to one - shot pulse reset _____________ for the reset pulse width (t pw ) . figure 2 . reset vs. mr _______ timing diagram reset output a microprocessors (ps) reset input starts the p in a known state. these p supervisory circuits v c c r e s e t v t h v t h t r p r e s e t 5 v 0 v 5 v 0 v 5 v 0 v m r r e s e t t m r t p w r e s e t h i g h l o w v c c 0 v v c c 0 v
_______________________________________ _________________________________ http://www.union - ic.com rev.0 1 jan .20 15 9 / 1 7 u m807/821/822 assert reset to prevent code execution errors during power - up, power - down, or brownout conditions. reset _____________ is guaranteed to be a logic low for v cc > 1v. once v cc exceeds the reset threshold, an internal timer keeps reset _____________ low for the reset timeout period; after this interval, reset _____________ goes high . if a brownout condition occurs (v cc dips below the reset threshold), reset _____________ goes low. any time v cc goes below the reset threshold, the internal timer resets to zero, and reset _____________ goes low. the internal timer starts after v cc returns above the reset threshold, and reset _____________ remains lo w for the reset timeout period. the manual reset input ( mr _______ ) can also initiate a reset. see the manual reset input section. the um 8 2 2 has an active - high reset output that is the inverse of the um 8 0 7 /8 2 1s reset _____________ output. the um 80 7 uses an open - drain output, and the um 8 2 1 /8 2 2 have a push - pull output stage. connect a pull - up resistor on the um 80 7 s reset _____________ output to any supply between 0 and 6v. manual reset input e ach device in the um807/821/822 family includes one manual reset input, which must be held logic - low for an extended setup peri od (t mr ) before the reset _____________ output asserts. when valid manual reset input conditions/setup periods are met, the reset _______ ______ output is one - shot pulse asserted low for a fixed reset pulse width (140ms min). existing front - panel pushbutton switches (i.e., power on/off, channel up/down, or mode select) can be used to drive the manual reset inputs. the extended manua l reset setup period prevents nuisance system resets during normal front - panel usage or resulting from inadvertent short - term pushbutton closure. this input has an internal 20k pull - up resistor, so it can be left open if it is not used. mr _______ can be driven with ttl or cmos - logic levels, or with open - drain/collector outputs. connect a normally open momentary switch from mr _______ to gnd to create a manual - reset function; external debounce circuitry is not required. if mr _______ is driven from long cables or if the device is used in a noisy environment, connecting a 0.1f capacitor from mr _______ to ground provides additional noise immunity. reset threshold accuracy the um80 7 / 8 2 1/8 2 2 are ideal for systems using a 5v5% or 3v5% power supply with ics specified for 5v10% or 3v10%, respectively. they are designed to meet worst - case specifications over temperature. the reset is guaranteed to assert after the power supply falls out of regulation, but before power drops below the minimum specified operat ing voltage range for the system ics. the thresholds are pre - trimmed and exhibit tight distribution, reducing the range over which an undesirable reset may occur.
_______________________________________ _________________________________ http://www.union - ic.com rev.0 1 jan .20 15 10 / 1 7 u m807/821/822 applications information negative - going v cc transients in addition to issuing a reset to the p during power - up, power - down, and brownout conditions, the um 80 7 /8 2 1/8 2 2 are relatively immune to short - duration negative - going v cc transients (glitches). figure 3 shows typical transient duration vs. reset comparator overdrive, for which the um 80 7 /8 2 1/8 2 2 do not generate a reset pulse. the graph was generated using a negative - going pulse applied to v cc , starting above the actual reset threshold and ending below it by the magnitude indicated (reset comparator overdrive). the graph indicates the typica l maximum pulse width a negative - going v cc transient may have without causing a reset pulse to be issued . as the magnitude of the transient increases (goes farther below the reset threshold), the max imum allowable pulse width decreases. typically, for the um8_ _l _e /m _e /j _e , a v cc transient that goes 1 25 mv below the reset threshold and lasts 4 0s or less will not cause a reset pulse to be issued. a 0.1f capacitor mounted as close as possible to the v cc provides additional transient immunity. figure 3 . maximum transient duration w ithout c ausing a reset pulse vs . reset comparator overdrive ensuring a valid reset ______________ output down to v cc = 0v when v cc falls below 1v, the um8 2 1 reset _____________ output no longer sinks current it becomes an open circuit. therefore, high - impedance cmos - logic inputs connected to reset _____________ can drift to undetermined voltages. this presents no problem in most applications since most p and other circuitry is inoperative with v cc below 1v. however, in applications where reset _____________ must be valid down to 0v, adding a pull - down resistor to reset _____________ pin will causes any stray leakage currents to flow to ground, holding reset _____________ low (figure 4 ). r1s value is not critical; 100k is large enough not to load reset _____________ and small enough to pul l reset _____________ to ground. a 100k pull - up resistor to v cc is also recommended for the um 8 2 2 if reset is required to remain valid for v cc < 1v. um8_ _l _ e/m _ e/j _ e um8_ _ t_ e/ s_ e/ r_ e /z_e
_______________________________________ _________________________________ http://www.union - ic.com rev.0 1 jan .20 15 11 / 1 7 u m807/821/822 figure 4 . reset ____________ valid to v cc = ground circuit interfacing to ps with bidirectional reset pins ps with bidirectional reset pins (such as the motorola68hc11 series) can contend with the um 8 2 1/8 2 2 reset outputs. if, for example, the um 8 2 1 reset ______________ output is asserted high and the p wants to pull it low, indeterminate logic levels may result. to correct such cases, connect a 4.7k resistor bet ween the um 8 2 1 reset ______________ (or um 8 2 2 reset) output and the p reset i/o (figure 5 ). buffer the reset output to other system components. figure 5 . interf acing to ps with bidirectional reset i/o um821 b u f f e r v c c v c c u m 8 2 1 r e s e t g n d 4 . 7 k v c c p r e s e t g n d b u f f e r e d r e s e t t o o t h e r s y s t e m c o m p o n e n t s
_______________________________________ _________________________________ http://www.union - ic.com rev.0 1 jan .20 15 12 / 1 7 u m807/821/822 um 80 7 open - drain reset ______________ output allows use with multiple supplies generally, the pull - up connected to the um 80 7 will connect to the su pply voltage that is being monitored at the ics v cc pin. however, some systems may use the open - drain output to level - shift from the monitored supply to reset circuitry powered by some other supply (figure 6 ). note that as the um 80 7 s v cc decreases below 1v, so does the ics ability to sink current at reset ______________ . also, with any pull - up, reset ______________ will be pulle d high as v cc decays toward 0. the voltage where this occurs depends on the pull - up resistor value and the voltage to which it is connected. figure 6. um80 7 open - drain reset ______________ output allows use with multiple supplies 3 . 3 v v c c u m 8 0 7 r e s e t g n d r p u l l - u p v c c 5 v s y s t e m r e s e t g n d 5 . 0 v
_______________________________________ _________________________________ http://www.union - ic.com rev.0 1 jan .20 15 13 / 1 7 u m807/821/822 package information um 80 7 /8 2 1/8 2 2 sot143 outline drawing dimensions symbol m illimeters i nches min max min max a 0.763 1.220 0.031 0.049 a1 0.013 0.15 0 0.001 0.006 a2 0.750 1.070 0.030 0.043 b 0.300 0.510 0.012 0.020 b2 0.760 0.930 0.030 0.037 c 0.080 0.200 0.003 0.008 d 2.800 3.040 0.112 0.122 e 2.200 2.640 0.088 0.211 e1 1.200 1.400 0.048 0.056 e 1.920bsc 0.077bsc e1 0.200bsc 0.008bsc l 1 0.5 40ref 0.022 l 0.400 0.600 0.016 0.024 land pattern notes: 1. compound dimension: 2.90 1. 30 ; 2. unit: mm; 3. general tolerance 0.05mm unless otherwise specified; 4. the layout is just for reference. tape and reel orientation 1 2 3 4 e e 1 e 1 e d b 2 b a 2 a c l 1 l a 1 t o p v i e w e n d v i e w s i d e v i e w 0 . 9 0 0 . 5 0 1 . 9 2 0 . 8 0 0 . 2 0 x x x m
_______________________________________ _________________________________ http://www.union - ic.com rev.0 1 jan .20 15 14 / 1 7 u m807/821/822 selection table part number reset threshold (v) timeout period (ms) manual reset setup period (s) output type marking code package type shipping qty um807lae 4.63 240 10.08 open - drain, active lo w 7la sot143 3000pcs/7inch tape & reel um807mae 4.38 240 open - drain, active low 7ma um807jae 4.00 240 open - drain, active low 7ja um807tae 3.08 240 open - drain, active low 7ta um807sae 2.93 240 open - drain, active low 7sa um807rae 2.63 240 open - drain, active low 7ra um807zae 2.32 240 open - drain, active low 7za um807lbe 4.63 240 6.72 open - drain, active low 7lb um807mbe 4.38 240 open - drain, active low 7mb um807jbe 4.00 240 open - drain, active low 7jb um807tbe 3.08 240 open - d rain, active low 7tb um807sbe 2.93 240 open - drain, active low 7sb um807rbe 2.63 240 open - drain, active low 7rb um807zbe 2.32 240 open - drain, active low 7zb um807lce 4.63 240 1.68 open - drain, active low 7lc um807mce 4.38 240 open - drain, a ctive low 7mc um807jce 4.00 240 open - drain, active low 7jc um807tce 3.08 240 open - drain, active low 7tc um807sce 2.93 240 open - drain, active low 7sc um807rce 2.63 240 open - drain, active low 7rc um807zce 2.32 240 open - drain, active low 7 zc
_______________________________________ _________________________________ http://www.union - ic.com rev.0 1 jan .20 15 15 / 1 7 u m807/821/822 selection table (continued) part number reset threshold (v) timeout period (ms) manual reset setup period (s) output type marking code package type shipping qty um821lae 4.63 240 10.08 push - pull, active low 1la sot143 3000pcs/7inch tape & reel um821mae 4.38 240 push - pull, active low 1ma UM821JAE 4.00 240 push - pull, active low 1ja um821tae 3.08 240 push - pull, active low 1ta um821sae 2.93 240 push - pull, active low 1sa um821rae 2.63 240 push - pull, active low 1ra um821zae 2.32 2 40 push - pull, active low 1za um821lbe 4.63 240 6.72 push - pull, active low 1lb um821mbe 4.38 240 push - pull, active low 1mb um821jbe 4.00 240 push - pull, active low 1jb um821tbe 3.08 240 push - pull, active low 1tb um821sbe 2.93 240 push - pul l, active low 1sb um821rbe 2.63 240 push - pull, active low 1rb um821zbe 2.32 240 push - pull, active low 1zb um821lce 4.63 240 1.68 push - pull, active low 1lc um821mce 4.38 240 push - pull, active low 1mc um821jce 4.00 240 push - pull, active lo w 1jc um821tce 3.08 240 push - pull, active low 1tc um821sce 2.93 240 push - pull, active low 1sc um821rce 2.63 240 push - pull, active low 1rc um821zce 2.32 240 push - pull, active low 1zc
_______________________________________ _________________________________ http://www.union - ic.com rev.0 1 jan .20 15 16 / 1 7 u m807/821/822 selection table (continued) part number reset thresh old (v) timeout period (ms) manual reset setup period (s) output type marking code package type shipping qty um822lae 4.63 240 10.08 push - pull, active high 2la sot143 3000pcs/7inch tape & reel um822mae 4.38 240 push - pull, active high 2ma um822jae 4 .00 240 push - pull, active high 2ja um822tae 3.08 240 push - pull, active high 2ta um822sae 2.93 240 push - pull, active high 2sa um822rae 2.63 240 push - pull, active high 2ra um822zae 2.32 240 push - pull, active high 2za um822lbe 4.63 240 6.7 2 push - pull, active high 2lb um822mbe 4.38 240 push - pull, active high 2mb um822jbe 4.00 240 push - pull, active high 2jb um822tbe 3.08 240 push - pull, active high 2tb um822sbe 2.93 240 push - pull, active high 2sb um822rbe 2.63 240 push - pull , active high 2rb um822zbe 2.32 240 push - pull, active high 2zb um822lce 4.63 240 1.68 push - pull, active high 2lc um822mce 4.38 240 push - pull, active high 2mc um822jce 4.00 240 push - pull, active high 2jc um822tce 3.08 240 push - pull, activ e high 2tc um822sce 2.93 240 push - pull, active high 2sc um822rce 2.63 240 push - pull, active high 2rc um822zce 2.32 240 push - pull, active high 2zc
_______________________________________ _________________________________ http://www.union - ic.com rev.0 1 jan .20 15 17 / 1 7 u m807/821/822 important notice the information in this document has been carefully reviewed and is believe d 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, o r 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 : uni t 606, no.570 shengxia r oa d, shanghai 2012 10 tel: 021 - 5109 3966 fax: 021 - 51026018 website: www.union - ic.com

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