View UM803RP_8688343.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

________________________________________________________________________ http://www.union - ic.com rev.0 1 jan .20 15 1 / 1 1 u m803 3 - pin microprocessor reset circuits um80 3 sot 323 /s ot23 - 3 general description the um 803 is a microprocessor (p) supervisory circuit used to monitor the power supplies in p and digital systems. it provide s excellent circuit reliability and low cost by e liminating external components and adjustments when used with +5v, +3.3v, +3.0v or +2.5v powered circuits. the circuit perform s a single function: it assert s a reset signal whenever the v cc supply voltage declines below a preset threshold, keeping it asser ted for at least 140ms after v cc has risen above the reset threshold. reset thresholds suitable for operation with a variety of supply voltages are available. the um 803 has an open - drain output stage. the um 803s open - drain reset _____________ output requires a pull - up resistor that can be connected to a voltage higher than v cc . the um 803 ha s an active - low reset _____________ outpu t. the reset comparator is designed to ignore fast transients on v cc , and the outputs are guaranteed to be in the correct logic state for v cc down to 1v. low supply current makes the um 803 ideal for use in portable equipment. the um 803 is available in a 3 - pin s ot323 and sot23 package . applications features ? computers ? controllers ? portable/battery - powered e quipment s ? intelligent i nstrument s ? critical p and c power monitoring ? automotive ? no external c omponents ? power supply transient i mmunity ? guaranteed r eset valid to v cc =+1v ? precision v cc monitoring of +2.5 v, +3 v , +3.3v and + 5 v s upplies ? fully specified over temperature ? 2 a supply current ? 140ms min imum power - on reset pulse width ? a vailable in one o utput c onfiguration : open - drain a ctive - low reset __________ o utput ? 3 - pin sot 323 and sot23 package s ? wide operation temperature: - 40 c to +85 c pin configurations top view m: month code um 80 3 sot 323 /sot23 - 3 g n d 1 r e s e t 2 3 v c c 3 x x x m 2 1 m a r k i n g p i n 1
________________________________________________________________________ http://www.union - ic.com rev.0 1 jan .20 15 2 / 1 1 u m803 ordering information um8 xx z p xx: output type =0 3 open - d rain active low 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 p: package type = s sot23 - 3 = p sot 32 3 typical operating circuit pin description pin number pin name function 1 gnd ground 2 reset ______________ reset _____________ output remains low while v cc is below the reset threshold, and for at least 140ms after v cc rises above the reset threshold. 3 v cc +5v, +3.3v, +3v or +2.5v supply voltage v c c u m 8 0 3 g n d r e s e t v c c g n d r e s e t i n p u t v c c p r p u l l u p
________________________________________________________________________ http://www.union - ic.com rev.0 1 jan .20 15 3 / 1 1 u m803 absolute maximum ratings (note 1) s ymbol p arameter v a lue u nit v cc supply voltage - 0.3 to +6.0 v reset _____________ - 0.3 to +6.0 i cc input current , v cc 20 ma i o output current , reset _ ____________ 20 ma rate of rise, v cc 100 v/s d continuous power dissipation sot323 ( derate 2.17 mw/c above 70c ) 174 mw sot23 - 3 ( derate 4 mw/c above 70c ) 320 t a operating temperature range sot323 - 40 to +1 2 5 c sot23 - 3 - 40 to +105 t stg storage temperature range - 65 to + 1 5 0 c lead temperature (soldering, 10s) + 300 c note 1: stresses beyond those listed under absolute maximum ratings may cause permanent damage to the device. these are stress ratings only and functional operation of the device at these or any other conditions be yond those indicated in the operational sections of the specifications are not implied. exposure to absolute maximum rating conditions for extended periods may affect device reliability.
________________________________________________________________________ http://www.union - ic.com rev.0 1 jan .20 15 4 / 1 1 u m803 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 values are at t a = +25c.) (note 2 ) symbol parameter conditions min typ max unit v cc supply voltage range t a =0 to + 70 1.0 5.5 v i cc supply current 2.0 a v th reset threshold l version t a =+25 4.56 4.63 4.70 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 v cc to reset delay v cc =v th to (v th C 100mv) 1 0 s t rp reset active timeout period 140 240 560 ms v ol reset ____________ output voltage low v cc =v th min, i sink =1.2ma, um803 t_ /s _ / r_ /z _ 0.3 v v cc =v th min, i sink =3.2ma, um803l _ /m _ /j _ 0.4 v cc >1.0v, i sink =50a 0.3 reset open - drain output leakage current (note 3 ) v cc >v th , reset deasserted 1 a note 2 : production testing done at t a = +25c; limits over temperature g uaranteed by design only. note 3 : guaranteed by design, not production tested.
________________________________________________________________________ http://www.union - ic.com rev.0 1 jan .20 15 5 / 1 1 u m803 typical operating characteristics (t a = +25c , unless otherwise noted .) vcc=3.3v supply current vs. temperature (um8 03 r _ ) power - down reset delay vs. temperature (um8 03 r _ ) power - up reset timeout vs. temperature
________________________________________________________________________ http://www.union - ic.com rev.0 1 jan .20 15 6 / 1 1 u m803 detailed description a micropr ocessors (ps) reset input starts the p in a known state. the um 80 3 assert s reset to prevent code - execution errors during power - up, power - down, or brownout conditions. it assert s a reset signal whenever the v cc supply voltage declines below a preset thr eshold, keeping it asserted for at least 140ms after v cc has risen above the reset threshold. t he um 80 3 uses a n open - drain output. connect a pull - up resistor on the um 803s reset _____________ output to any supply between 0 and 6v. applications information negative - going v cc transient in addition to issuing a reset to the p during power - up, power - down, and brownout conditions, the um 80 3 is relatively immune to short - duration negative - going v cc transients (glitches). figure 1 shows typical transient duration vs. reset comparator overdrive, for which the um 80 3 do es not generate a reset pulse. the graph was generated using a negative - going pulse applied to v cc , starting 0.5v above the actual r eset threshold and ending below it by the magnitude indicated (reset comparator overdrive). the graph indicates the maximum pulse width a negative - going v cc transient can have without causing a reset pulse. as the magnitude of the transient increases (goes farther below the reset threshold), the max imum allowable pulse width decreases. typically, for the um 8 03 l _ , um 8 03 m _ and um803j _ , a v cc transient that goes 100mv below the reset threshold and lasts 20s or less will not cause a reset pulse. a 0.1f bypass capacitor mounted as close as possible to the v cc pin provides additional transient immunity. figure 1 . maximum transient duration without causing a reset pulse vs . reset comparator overdrive interfacing to ps with bidirectional reset pins since the reset _____________ output on the um 803 is open drain, this device interfaces easily with ps that have bidirectional reset pins, su ch as the motorola 68hc11. connecting the p supervisors reset _____________ output directly to the microcontrollers (cs) reset _____ ________ pin with a single pull - up resistor um803l _ /m _/j_ um803 t_ /s _ / r_ /z _
________________________________________________________________________ http://www.union - ic.com rev.0 1 jan .20 15 7 / 1 1 u m803 allows either device to assert reset (figure 2 ). figure 2 . interfacing to ps with bidirectional reset i/o um 803 open - drain reset ______________ output allows use with multiple supplies generally, the pull - up connected to the um 803 will connect to the supply 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 mo nitored supply to reset circuitry powered by some other supply (figure 3 ). note that as the um 803s v cc decreases below 1v, so does the ics ability to sink current at reset _____________ . als o, with any pull - up, reset _____________ will be pulled 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 connecte d. figure 3 . um 803 open - drain reset _____________ output allows use with multiple supplies benefits of highly accurate reset threshold most p supervisor circuit s have reset threshold vol tages between 5% and 10% below the value of nominal supply voltages. this ensures a reset will not occur within 5% of the nominal supply, but will occur when the supply is 10% below nominal. when using ics rated at only the nominal supply 5%, this leaves a zone of uncertainty where the supply is between 5% and 10% low, and where the reset may or may not be asserted. the um 8 03 l _ /t _ /z _ use highly accurate circuitry to ensure that reset is asserted close to the 5% limit, and long before the supply has decli ned to 10% below nomi n al. um803 um803
________________________________________________________________________ http://www.union - ic.com rev.0 1 jan .20 15 8 / 1 1 u m803 package information um 80 3 sot 323 outline drawing dimensions symbol millimeters inches min max min max d 1.80 2.20 0.072 0.088 e 1.15 1.35 0.006 0.054 he 1.80 2.40 0.072 0.050 b 0.25 0.40 0.010 0.016 e 0.65bsc 0.026bsc q1 0.10 0.40 0.004 0.016 a 0.80 1.10 0.032 0.044 a1 0.00 0.10 0.00 0.004 a2 0.80 1.00 0.032 0.040 c 0.10 0.18 0.004 0.007 l 0.10 0.30 0.004 0.012 l1 0.425typ 0.017typ land pattern notes: 1. compound dimension: 2.00 1. 25; 2. unit: mm; 3.general tolerance 0.05mm unless otherwise specified; 4. the layout is just for reference. tape and reel orientation b d h e e p i n 1 e e l 1 l q 1 c a 2 a 1 a t o p v i e w e n d v i e w s i d e v i e w 0 . 6 5 0 . 6 5 0 . 5 0 . 6 1 . 8 0 x x x m
________________________________________________________________________ http://www.union - ic.com rev.0 1 jan .20 15 9 / 1 1 u m803 um 803 sot23 - 3 outline drawing dimensions symbol millimeters inches min max min max a 1.050 1.250 0.041 0.049 a1 0.000 0.100 0.000 0.004 a2 1.050 1.150 0.041 0.045 b 0.300 0.500 0.012 0.020 c 0.100 0.200 0.004 0.008 d 2.820 3.020 0.111 0.119 e 1.500 1.700 0.05 9 0.067 e1 2.650 2.950 0.104 0.116 e 0.950ref 0.037ref e1 1.800 2.000 0.071 0.079 l 0.550ref 0.022ref l 1 0.300 0.600 0.012 0.024 0 8 0 8 land pattern notes: 1. compound dimension: 2.92 1 .60 ; 2. unit: m m; 3. general tolerance 0.0 5 mm unless otherwise specified; 4. the layout is just for reference. tape and reel orientation d e 1 e l e e 1 3 1 2 0 . 2 t o p v i e w e n d v i e w s i d e v i e w a 1 a 2 a b 1 . 9 0 2 . 0 2 0 . 8 0 x x x m
________________________________________________________________________ http://www.union - ic.com rev.0 1 jan .20 15 10 / 1 1 u m803 selection table part number reset threshold (v) timeout period (ms) output type marking code pa ckage type shipping qty um80 3 l p 4.63 240 open - d rain, active low vle sot 323 3000pcs/7inch tape & reel um80 3 m p 4.38 240 open - d rain, active low vme um803jp 4.00 240 open - drain, active low vje um80 3 t p 3.08 240 open - drain, active low vte um80 3 s p 2.9 3 240 open - drain, active low vse um80 3 r p 2.63 240 open - drain, active low vre um80 3 z p 2.32 240 open - drain, active low vze um803ls 4.63 240 open - d rain, active low 03l sot23 - 3 3000pcs/7inch tape & reel um803ms 4.38 240 open - drain, active low 03m um803js 4.00 240 open - drain, active low 03j um803ts 3.08 240 open - drain, active low 03t um803ss 2.93 240 open - drain, active low 03s um803rs 2.63 240 open - drain, active low 03r um803zs 2.32 240 open - drain, active low 03z
________________________________________________________________________ http://www.union - ic.com rev.0 1 jan .20 15 11 / 1 1 u m803 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 ma kes 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 supp ly the best product possible. union semiconductor, inc add : unit 606, no.570 shengxia r oa d, shanghai 2012 10 tel: 021 - 5109 3966 fax: 021 - 51026018 website: www.union - ic.com

▲Up To Search▲

Price & Availability of UM803RP

	To Download UM803RP Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .