SGM811 sgm812 general description the SGM811/sgm812 supervisory circuits monitor the power supply voltage in microprocessor and digital systems. the SGM811/sgm812 is designed to monitor seven different voltages, these voltages have been selected for the effective monitoring of 2.5v, 3 v, 3.3 v, and 5 v supply voltage levels. they provide a reset output during power-up, power-down and brownout conditions. on power-up, an internal timer holds reset asserted for 240 ms. this holds the microprocessor in a reset state until conditions have stabilized. the reset output remains operational with v cc as low as 1 v. the SGM811 provides an active low reset signal ( reset ) while the sgm812 provides an active high signal (reset) output. the SGM811/sgm812 has a manual reset input. the manual reset function is very useful, especially if the circuit in which the SGM811/sgm812 is operating enters into a state that can only be detected by the user. allowing the user to reset a system manually can reduce the damage or danger that could otherwise be caused by an out-of-control or locked system. the devices come in a 4-pin sot143 and 5-pin sot23 packages. applications microprocessor systems controllers intelligent instruments automotive systems safety systems portable instruments microprocessor supervisory with manual reset input features ? superior upgrade for max811/max812 and adm811/adm812 ? specified over temperature ? low power consumption (17 a typ) ? precision voltage monitor: 2.5v,3 v, 3.3 v, 5 v options ? reset assertion down to 1 v v cc ? 160 ms min power-on reset logic low reset output (SGM811) logic high reset output (sgm812) ? manual reset input ? compact 4-pin sot143 and 5-pin sot23 packages pin configurations top view 1 2 3 4 sot143-4 gnd v cc reset/reset mr 1 3 4 sot23-5 gnd v cc reset/reset 5 mr 2 nc typical operation circuit microprocessor system SGM811 gnd reset mr reset gnd v cc v cc 100ko nov 2006 shengbang microelectronics co, ltd tel: 86/451/84348461 www.sg-micro.com
SGM811/812 2 ordering information ordering number reset threshold (v) peckage type specified temperature range package marking package option SGM811-lxn5 4.63 sot23-5 - 40c to +125c 811l tape and reel, 3000 SGM811-m xn5 4.38 sot23-5 - 40c to +125c 811m tape and reel, 3000 SGM811-jxn5 4.00 sot23-5 - 40c to +125c 811j tape and reel, 3000 SGM811-t xn5 3.08 sot23-5 - 40c to +125c 811t tape and reel, 3000 SGM811-s xn5 2.93 sot23-5 - 40c to +125c 811s tape and reel, 3000 SGM811-r xn5 2.63 sot23-5 - 40c to +125c 811r tape and reel, 3000 SGM811-z xn5 2.32 sot23-5 - 40c to +125c 811z tape and reel, 3000 SGM811-lxka4 4.63 sot143-4 - 40c to +125c 811l tape and reel, 3000 SGM811-mx ka4 4.38 sot143-4 - 40c to +125c 811m tape and reel, 3000 SGM811-jx ka4 4.00 sot143-4 - 40c to +125c 811j tape and reel, 3000 SGM811-tx ka4 3.08 sot143-4 - 40c to +125c 811t tape and reel, 3000 SGM811-sx ka4 2.93 sot143-4 - 40c to +125c 811s tape and reel, 3000 SGM811-rx ka4 2.63 sot143-4 - 40c to +125c 811r tape and reel, 3000 SGM811-z x ka4 2.32 sot143-4 - 40c to +125c 811z tape and reel, 3000 sgm812-lxn5 4.63 sot23-5 - 40c to +125c 812l tape and reel, 3000 sgm812-m xn5 4.38 sot23-5 - 40c to +125c 812m tape and reel, 3000 sgm812-jxn5 4.00 sot23-5 - 40c to +125c 812j tape and reel, 3000 sgm812-t xn5 3.08 sot23-5 - 40c to +125c 812t tape and reel, 3000 sgm812-s xn5 2.93 sot23-5 - 40c to +125c 812s tape and reel, 3000 sgm812-r xn5 2.63 sot23-5 - 40c to +125c 812r tape and reel, 3000 sgm812-z xn5 2.32 sot23-5 - 40c to +125c 812z tape and reel, 3000 sgm812-lx ka4 4.63 sot143-4 - 40c to +125c 812l tape and reel, 3000 sgm812-mx ka4 4.38 sot143-4 - 40c to +125c 812m tape and reel, 3000 sgm812-jx ka4 4.00 sot143-4 - 40c to +125c 812j tape and reel, 3000 sgm812-tx ka4 3.08 sot143-4 - 40c to +125c 812t tape and reel, 3000 sgm812-sx ka4 2.93 sot143-4 - 40c to +125c 812s tape and reel, 3000 sgm812-rx ka4 2.63 sot143-4 - 40c to +125c 812r tape and reel, 3000 sgm812-z x ka4 2.32 sot143-4 - 40c to +125c 812z tape and reel, 3000
SGM811/812 3 electrical characteristics (v cc typ = 5 v for l/m/j models, 3.3 v for t/s models, 3 v fo r r models, 2.5 v for z models; unless otherwise noted.) parameter conditions min typ max units supply t a = 0c to 70c 1.0 5.5 v voltage t a = - 40c to +125c 1.2 5.5 v v cc < 5.5 v, sgm81_l/m/j, t a = 25c 20 30 a v cc < 5.5 v, sgm81_l/m/j, t a = - 40c to +125c 50 a v cc < 3.6 v, sgm81_r/s/t/z, t a = 25c 17 25 a current v cc < 3.6 v, sgm81_r/s/t/z, t a = - 40c to +125c 45 a reset voltage threshold t a = 25c 4.537 4.63 4.723 v sgm81_l t a = - 40c to +125c 4.40 4.86 v t a = 25c 4.292 4.38 4.468 v sgm81_m t a = - 40c to +125c 4.16 4.56 v t a = 25c 3.92 4.00 4.08 v sgm81_j t a = - 40c to +125c 3.8 4.2 v t a = 25c 3.003 3.08 3.157 v sgm81_t t a = - 40c to +125c 2.92 3.23 v t a = 25c 2.857 2.93 3.003 v sgm81_s t a = - 40c to +125c 2.78 3.08 v t a = 25c 2.564 2.63 2.696 v sgm81_r t a = - 40c to +125c 2.50 2.76 v t a = 25c 2.262 2. 23 2.378 v sgm81_z t a = - 40c to +125c 2.22 2.42 v reset threshold temperature coefficient 30 ppm/c v cc to reset/ reset delay v cc = v th to (v th ?100 mv) 20 s t a = - 40c to +85c 160 240 560 ms reset active timeout period t a = - 40c to +125c 100 840 ms manual reset minimum pulsewidth 10 s glitch immunity 100 ns reset/ reset propagation delay 0.5 s pull-up resistance 1 m the manual reset circuit will act on: an input rising above v cc > v th(max) , sgm81_l/m/j 2.3 v an input falling below v cc > v th(max) , sgm81_l/m/j 0.8 v an input rising above v cc > v th(max) , sgm81_r/s/t/z 0. 7 v cc v an input falling below v cc > v th(max) , sgm81_r/s/t/z 0.25 v cc v
SGM811/812 4 electrical characteristics (continued) (v cc typ = 5 v for l/m/j models, 3.3 v for t/s models, 3 v fo r r models, 2.5 v for z models; unless otherwise noted.) parameter conditions min typ max units reset/ reset output voltage low (SGM811r/s/t/z) v cc = v th(min) , i sink = 1.2ma 0.3 v low (SGM811l/m/j) v cc = v th(min) , i sink = 3.2ma 0.4 v low (SGM811r/s/t/z/l/m/j) v cc > 1.0 v, i sin k = 50a 0.3 v high (SGM811r/s/t/z) v cc > v th(max) , i source = 500a 0.8v cc v high (SGM811l/m/j) v cc > v th(max) , i source = 800a v cc ? 1.5 v low (sgm812r/s/t/z) v cc = v th(max) , i sink = 1.2ma 0.3 v low (sgm812l/m/j) v cc = v th(max) , i sink = 3.2ma 0.4 v high (sgm812 r/s/t/z/l/m/j) 1.8 v < v cc < v th(min) , i source = 150a 0.8v cc v specifications subject to change without notice. absolute maximum ratings (typical values are at t a = 25c, unless otherwise noted.) terminal voltage (with respect to ground) v cc ................................................................................?0.3 v to +6 v all other inputs ............................................ ?0.3 v to v cc + 0.3 v input current v cc , mr ................................................................................ 20 ma output current reset , reset ..................................................................... 20 ma power dissipation, p d @ t a = 25 sot23-5 .....................................................................................0.4w sot143-4................. ............ ........... ............ ............. ............ ..... 0.32w operating temperature range....... ............ ........- 40c to +125c junction temperature....... ............ ............ ........ ........... .........+150c storage temperature. ............ ............ ............ ........- 65c to +150c lead temperature (soldering, 10s)... ........... ........... ............+260c esd susceptibility hbm........... ................. ............ ........... .......... ........... .......... ........4000v mm..............................................................................................400v 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 beyond those indicated in the operational sections of the specifications is not imp lied. exposure to absolute maximum rating conditions for extended periods may affect device reliability. pin description pin number SGM811 sgm812 name sot143-4 sot23-5 sot143-4 function gnd 1 1 1 ground nc 2 no connect. reset 2 3 ? active low logic output. reset remains low while v cc is below the reset threshold or when mr is low; reset then remains low for at least 160 ms after v cc rises above the reset threshold. reset ? ? 2 active high logic output. reset remains high while v cc is below the reset threshold or when mr is low; reset then remains high for 240 ms (typical) after v cc rises above the reset threshold. m r 3 4 3 manual reset. this active low debounced inpu t will ignore input pulses of 100 ns or less (typical) and is guaranteed to accept input pulses of greater than 10 s. leave floating when not used. v cc 4 5 4 power supply voltage that is monitored.
SGM811/812 typical performance characteristics power-down reset delay vs.temperature 0 50 100 150 200 250 -50 -30 -10 10 30 50 70 90 110 130 temperature( ) power-down reset (s) SGM811l/m/j v od = v th - v cc v od = 10mv v od = 20mv v od = 100mv v od = 200mv power-down reset delay vs.temperature 0 50 100 150 200 250 300 -50 -30 -10 10 30 50 70 90 110 130 temperature( ) power-down reset (s) SGM811t/s/r v od = v th - v cc v od = 10mv v od = 20mv v od = 100mv v od = 200mv power-up reset delay vs.temperature 248 250 252 254 256 258 260 262 264 -50 -30 -10 10 30 50 70 90 110 130 temperature( ) power-down reset (ms) SGM811s supply current vs. temperature (no load) 0 5 10 15 20 25 30 -50 -30 -10 10 30 50 70 90 110 130 temperature( ) supply current ( a) v cc = 5.5v v cc = 3.6v normalized reset voltage threshold vs. temperature 0.988 0.99 0.992 0.994 0.996 0.998 1 1.002 1.004 1.006 1.008 -50 -30 -10 10 30 50 70 90 110 130 temperature( ) normalized reset threshold 0 50 100 150 200 250 300 350 400 1 10 100 1000 maximum transient duration (s) SGM811l/m/j SGM811t/s/r maximum transient duration without causing a reset pulse vs. reset comparator overdrive reset comparator overdrive , v th - v cc (mv)
SGM811/812 typical performance characteristics reset output voltage vs. supply voltage 200ms/div 2v/div supply voltage reset output 5v p-p voltage SGM811s SGM811r
SGM811/812 application notes manual reset the SGM811/sgm812 is equipped with a manual reset input this input is designed to operate in a noisy environment where unwanted glitches could be induced. these glitches could be produced by the bouncing action of a switch contact, or where a manual reset switch may be located some distance away from the circuit (the cabling of which may pick-up noise). the manual reset input is guaranteed to ignore logically valid inputs that are faster than 100 ns and to accept inputs longer in duration than 10 s. benefits of a very accurate reset threshold because the SGM811/sgm812 can operate effectively even when there are large degradations of the supply voltages, the possibility of a malfunction during a power failure is greatly reduced. another advantage of the SGM811/sgm812 is its very accurate internal voltage reference circuit. combined, these benefits produce an exceptionally reliable microprocessor supervisory circuit. SGM811 gnd reset v cc v cc figure 1. ensuring a valid reset output down to v cc = 0v ensuring a valid reset output down to v cc = 0 v when v cc falls below1.0 v, the SGM811/sgm812?s reset no longer sinks current. therefore, a high impedance cmos logic input connected to reset may drift to undetermined logic levels. to eliminate this problem, a 100 k resistor should be connected from reset to ground. reset output on power-up and after v cc rises above the reset threshold, an internal timer holds the reset ou tput active for 240 ms (typical). this is intended as a power-on reset signal for the processor. 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 output is similarly activated and remains active for 240 ms (typical) after the supply recovers. this allows time for the power supply and microprocessor to stabilize. the SGM811 provides an active low reset output ( reset ) while the sgm812 provides an active high output ( reset ). during power-down of the SGM811, the reset output remains valid (low) with v cc as low as 1 v. this ensures that the microprocessor is held in a stable shutdown condition as the supply falls and also ensures that no spurious activity can occur via the microprocessor as it powers up. glitch immunity the SGM811/sgm812 contains internal filtering circuitry providing glitch immunity from fast transient glitches on the power supply line. t 1 t 1 reset v cc v ref v ref v ref v ref t 1 = reset time = 240ms typical v ref = reset voltage threshold figure 2. power fail reset timing interfacing to other devices output the SGM811/sgm812 is designed to integrate with as many devices as possible. one feature of the SGM811/sgm812 is the reset output, which is directly proportional to v cc (this is guaranteed only while v cc is greater than 1 v). this enables the part to be used with both 3 v and 5 v, or any nominal voltage within the minimum and maximum specifications for v cc .
SGM811/812 package outline dimensions sot23-5 d e1 b a2 a a1 e l l c e1 0 0.20 e dimensions in millimeters dimensions in inches symbol 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 0.400 0.012 0.016 c 0.100 0.200 0.004 0.008 d 2.820 3.020 0.111 0.119 e 1.500 1.700 0.059 0.067 e1 2.650 2.950 0.104 0.116 e 0.950typ 0.037typ e1 1.800 2.000 0.071 0.079 l 0.700ref 0.028ref l1 0.300 0.600 0.012 0.024 0 8 0 8
SGM811/812 package outline dimensions sot143- 4 d b1 s e l c h e1 e2 b a1 a dimensions in millimeters symbol min max a 0.890 1.120 a1 0.013 0.100 b 0.760 0.940 b1 0.370 0.510 c 0.085 0.180 d 2.800 3.040 e 1.200 1.400 e1 1.920 bsc e2 0.200 bsc h 2.100 2.640 l 0.55 ref s 0.450 0.600
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