revision 5/15/2009 preliminary and all contents are subject to change without prior notice. ? seaward electronics, inc., 2007. ? www.seawardinc.com 1 SE811 4-pin microprocessor reset monitor (preliminary) description the SE811 is a cost-effective system supervisor integrated circuit (ic) designed to monitor v cc in digital and mixed signal systems and provide a warning signal when the system power supply is out of working range, and a reset signal to the host processor when necessary. no external components are required. the SE811 also provides a manual reset input. the reset output is driven active within 20 sec of v cc falling through the reset voltage threshold. reset is maintained active after v cc rises above the reset threshold. the SE811 has an active-low reset output. the output of the se809 is guaranteed valid down to v cc =1v. the SE811 is characterized for operation from -40 o c to 125 o c, junction temperature . the SE811 is optimized to reject fast transient glitches on the v cc line. low supply current of 7 a (v cc =3.3v) makes these devices suitable for battery powered applications. the output voltages range from 1.7v to 4.5v in 100mv increments. standard voltage versions are 2.30, 2.63, 2.93, 3.08, 4.0, 4.38, and 4.63v. features ? precision v cc monitor for 2.8v, 3.0v, 3.3v, and 5.0v supplies ? 150msec typical reset output delay. ? reset output guaranteed to v cc =1.0v ? low 7 a supply current typical. ? v cc transient immunity ? manual reset input. ? 4-pin sot-143 package ? no external components ? esd rating is 2kv(hbm). ? wide operating temperature: -40c to 125c ? 100% lead (pb)-free pin configuration SE811 1 2 3 4 application ? computers ? embedded systems ? battery powered equipment ? critical p power supply monitoring application diagram gnd gnd vcc vcc vcc sot143 gnd top view mr reset vcc mr reset SE811 reset input manual reset
revision 5/15/2009 preliminary and all contents are subject to change without prior notice. ? seaward electronics, inc., 2007. ? www.seawardinc.com 2 SE811 4-pin microprocessor reset monitor (preliminary) absolute maximum ratings (1) parameter symbol value units input voltage v cc 5.5 v manual reset input mr -0.3 to (v cc + 0.3) v output voltage reset -0.3 to (v cc + 0.3) v input current 20 ma output current i out 20 ma power dissipation p d internally limited (3) output short circuit duration infinite thermal resistance, junction-to-ambient ja 230 c/w operating temperature range t a -40~ 125 lead temperature (soldering, 10 sec.) 260 c operating rating (2) parameter symbol value units supply input voltage v cc +2.0v to +5.5 v junction temperature t j -40 to +125 c ordering/marking information (sot143) ordering information marking information SE811xs ? s811xa suffix reset v cc threshold(v) l 4.63 m 4.38 j 4.00 t 3.08 s 2.93 r 2.63 the ?x? denotes a suffix for v cc threshold. the last character is the batch number. a dot on top right corner is for lead-free process.
revision 5/15/2009 preliminary and all contents are subject to change without prior notice. ? seaward electronics, inc., 2007. ? www.seawardinc.com 3 SE811 4-pin microprocessor reset monitor (preliminary) electrical characteristics vcc=5v for l/m/j ;3.3v for t/s ;3.0v for r ,t a = 25c, unless otherwise specified. symbol parameter condition min typ max unit v cc input voltage 2.0 5.5 v i cc supply current -- 7 10 a v th reset threshold SE811l-4.63v SE811m-4.38v SE811j-4.00v SE811t-3.08v SE811s-2.93v SE811r-2.63v SE811r-2.30v 4.51 4.27 3.90 3.00 2.85 2.56 2.18 4.63 4.38 4.00 3.08 2.93 2.63 2.25 4.75 4.49 4.10 3.16 3.00 2.70 2.33 v reset threshold temperature coefficient (4) -- 30 -- ppm/c v cc to reset delay v cc = v th to (v th ? 100mv) -- 20 -- sec reset active timeout period -- 150 msec v ol reset output voltage low i sink = 3ma -- -- 0.4 v v oh reset output voltage high i source = 800 a 0.8v cc -- -- v tmr mr minimum pulse width 10 sec tmd mr to reset propagation delay 1 sec v low 0.25vcc v mr input threshold v high open(high-z) v
revision 5/15/2009 preliminary and all contents are subject to change without prior notice. ? seaward electronics, inc., 2007. ? www.seawardinc.com 4 SE811 4-pin microprocessor reset monitor (preliminary) note 1: exceeding the absolute maximum rating may damage the device. note 2: the device is not guaranteed to f unction outside its operating rating. note 3: the maximum allowable power dissipation at any t a (ambient temperature) is calculated using: p d(max) = (t j(max) ? t a )/ ja . exceeding the maximum allowable power dissipati on will result in excessive die temperature, and the regulator will go into thermal shutdown. see ?thermal consideration? section for details note 4: reset threshold temperature coefficient is the worst case voltage change divided by the total temperature range. pin description: pin no. symbol description 1 gnd ground 2 reset reset output remains low whil e vcc is below the reset voltage threshold and for 150msec(typ) after vcc rises above reset threshold 3 mr manual reset input. a logic low on mr asserts. reset remains asserted as long as mr is low and for 150ms after mr returns high. it can be driven from a ttl or cmos-logic line, or shorted to ground with a switch. leave open if unused. 4 vcc supply voltage (typ.)
revision 5/15/2009 preliminary and all contents are subject to change without prior notice. ? seaward electronics, inc., 2007. ? www.seawardinc.com 5 SE811 4-pin microprocessor reset monitor (preliminary) a pp lication hints general description SE811 is the extension of se809 family. it provide the same basic function as se809, plus the additional mr function. the detailed operation of mr function is described below. manual reset input many p-based products require manual reset capability, allowing the operator, a test technician, or external logic circuitry to initiate a reset. a logic low on mr will trigger the reset process. reset remains asserted as long as mr is low and for 150ms after mr returns high. leave open if unused. connect a normally open momentary switch from mr to gnd to create a manualreset 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 0.1 f capacitor from mr to ground provides additional noise immunity. it is important that the mr pin is not connected to vcc in applications.
revision 5/15/2009 preliminary and all contents are subject to change without prior notice. ? seaward electronics, inc., 2007. ? www.seawardinc.com 6 SE811 4-pin microprocessor reset monitor (preliminary) typical performance characteristics t-delay vs temperature 0 50 100 150 200 250 300 350 400 -50 -25 0 25 50 75 100 125 150 temperature( ) reset active timeou t period (ms) vth vs temperature 2.90 2.92 2.94 2.96 2.98 3.00 3.02 -50 -25 0 25 50 75 100 125 150 temperature( ) rset threshold(v )
revision 5/15/2009 preliminary and all contents are subject to change without prior notice. ? seaward electronics, inc., 2007. ? www.seawardinc.com 7 SE811 4-pin microprocessor reset monitor (preliminary) outline drawing sot-143
revision 5/15/2009 preliminary and all contents are subject to change without prior notice. ? seaward electronics, inc., 2007. ? www.seawardinc.com 8 SE811 4-pin microprocessor reset monitor (preliminary) contact information seaward electronics incorporated ? china section b, 2nd floor, shangdi scientific office complex,#22 shangdi xinxi rd haidian district, beijing 100085, china tel: 86-10-8289-5700/01/05 fax: 86-10-8289-5706 email: sales@seawardinc.com.cn seaward electronics corporation ? taiwan 2f, #181, sec. 3, minquan east rd, ta i p e i , ta i w a n r . o . c tel: 886-2-2712-0307 fax: 886-2-2712-0191 email: sales@seawardinc.com.tw seaward electronics incorporated ? north america 1512 centre pointe dr. milpitas, ca95035, usa tel: 1-408-821-6600 last updated - 5/15/2009
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