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sgm811/sgm812 microprocessor supervisory with manual reset input 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 1.8v, 2.5v, 3v, 3.3v and 5v 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 240ms. this holds the microprocessor in a reset state until conditions have stabilized. the reset output remains operational with v cc as low as 1v. 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 sot-143 and sot-23-5 packages. applications microprocessor systems controllers intelligent instruments automotive systems safety systems portable instruments features superior upgrade for max811/max812 and adm811/adm812 specified over temperature low power consumption (13 a typ) precision voltage monitor: 1.8v, 2.5v, 3v, 3.3v and 5v options reset assertion down to 1v v cc 150ms min power-on reset logic low reset output (sgm811) logic high reset output (sgm812) manual reset input green sot-143 and sot-23-5 packages pin configurations (top view) 1 3 4 sot-23-5 gnd v cc reset/reset 5 mr 2 nc 1 2 3 4 sot-143 gnd v cc reset/reset mr typical operation circuit microprocessor system sgm811 gnd reset mr reset gnd v cc v cc 100k rev. b. 4 sg micro corp www.sg-micro.com
microprocessor supervisory with manual reset input 2 sgm811/812 sg micro corp www.sg-micro.com package/ordering information ordering number reset threshold (v) peckage type specified temperature range package marking packing option sgm811-lxn5/tr 4.63 sot-23-5 -40 to +125 811l tape and reel, 3000 sgm811-mxn5/tr 4.38 sot-23-5 -40 to +125 811m tape and reel, 3000 sgm811-jxn5/tr 4.00 sot-23-5 -40 to +125 811j tape and reel, 3000 sgm811-txn5/tr 3.08 sot-23-5 -40 to +125 811t tape and reel, 3000 sgm811-sxn5/tr 2.93 sot-23-5 -40 to +125 811s tape and reel, 3000 sgm811-rxn5/tr 2.63 sot-23-5 -40 to +125 811r tape and reel, 3000 sgm811-zxn5/tr 2.32 sot-23-5 -40 to +125 811z tape and reel, 3000 sgm811-lxka4/tr 4.63 sot-143 -40 to +125 811l tape and reel, 3000 sgm811-mxka4/tr 4.38 sot-143 -40 to +125 811m tape and reel, 3000 sgm811-jxka4/tr 4.00 sot-143 -40 to +125 811j tape and reel, 3000 sgm811-txka4/tr 3.08 sot-143 -40 to +125 811t tape and reel, 3000 sgm811-sxka4/tr 2.93 sot-143 -40 to +125 811s tape and reel, 3000 sgm811-rxka4/tr 2.63 sot-143 -40 to +125 811r tape and reel, 3000 sgm811-zxka4/tr 2.32 sot-143 -40 to +125 811z tape and reel, 3000 sgm811-xxka4/tr 1.63 sot-143 -40 to +125 811x tape and reel, 3000 sgm812-lxn5/tr 4.63 sot-23-5 -40 to +125 812l tape and reel, 3000 sgm812-m xn5/tr 4.38 sot-23-5 -40 to +125 812m tape and reel, 3000 sgm812-jxn5/tr 4.00 sot-23-5 -40 to +125 812j tape and reel, 3000 sgm812-txn5/tr 3.08 sot-23-5 -40 to +125 812t tape and reel, 3000 sgm812-sxn5/tr 2.93 sot-23-5 -40 to +125 812s tape and reel, 3000 sgm812-rxn5/tr 2.63 sot-23-5 -40 to +125 812r tape and reel, 3000 sgm812-zxn5/tr 2.32 sot-23-5 -40 to +125 812z tape and reel, 3000 sgm812-lxka4/tr 4.63 sot-143 -40 to +125 812l tape and reel, 3000 sgm812-mxka4/tr 4.38 sot-143 -40 to +125 812m tape and reel, 3000 sgm812-jxka4/tr 4.00 sot-143 -40 to +125 812j tape and reel, 3000 sgm812-txka4/tr 3.08 sot-143 -40 to +125 812t tape and reel, 3000 sgm812-sxka4/tr 2.93 sot-143 -40 to +125 812s tape and reel, 3000 sgm812-rxka4/tr 2.63 sot-143 -40 to +125 812r tape and reel, 3000 sgm812-zxka4/tr 2.32 sot-143 -40 to +125 812z tape and reel, 3000
microprocessor supervisory with manual reset input 3 sgm811/812 sg micro corp www.sg-micro.com electrical characteristics (v cc typ = 5v for l/m/j models, 3.3v for t/s models, 3v for r mo dels, 2.5v for z models, 1.8v for x models; unless otherwise noted.) parameter conditions min typ max units supply t a = 0 to +70 1.0 5.5 v voltage t a = -40 to +125 1.2 5.5 v v cc < 5.5v, sgm81_l/m/j, t a = +25 17 30 a v cc < 5.5v, sgm81_l/m/j, t a = -40 to +125 50 a v cc < 3.6v, sgm81_r/s/t/z/x, t a = +25 13 25 a current v cc < 3.6v, sgm81_r/s/t/z/x, t a = -40 to +125 45 a reset voltage threshold t a = +25 4.537 4.63 4.723 v sgm81_l t a = -40 to +125 4.40 4.86 v t a = +25 4.292 4.38 4.468 v sgm81_m t a = -40 to +125 4.16 4.56 v t a = +25 3.92 4.00 4.08 v sgm81_j t a = -40 to +125 3.8 4.2 v t a = +25 3.003 3.08 3.157 v sgm81_t t a = -40 to +125 2.92 3.23 v t a = +25 2.857 2.93 3.003 v sgm81_s t a = -40 to +125 2.78 3.08 v t a = +25 2.564 2.63 2.696 v sgm81_r t a = -40 to +125 2.50 2.76 v t a = +25 2.262 2.32 2.378 v sgm81_z t a = -40 to +125 2.22 2.42 v t a = +25 1.589 1.63 1.671 v sgm811x t a = -40 to +125 1.55 1.71 v reset threshold temperature coefficient 30 ppm/c v cc to reset/ reset delay v cc = v th to (v th - 100mv) 20 s t a = -40 to +85 150 240 560 ms reset active timeout period t a = -40 to +125 100 840 ms manual reset minimum pulse width 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/x 0.7 v cc v an input falling below v cc > v th(max) , sgm81_r/s/t/z/x 0.25 v cc v
microprocessor supervisory with manual reset input 4 sgm811/812 sg micro corp www.sg-micro.com electrical characteristics (v cc typ = 5v for l/m/j models, 3.3v for t/s models, 3v for r mo dels, 2.5v for z models, 1.8v for x models; unless otherwise noted.) parameter conditions min typ max units reset/ reset output voltage low (sgm811r/s/t/z/x) 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/x/l/m/j) v cc > 1.0v, i sink = 50 a 0.3 v high (sgm811r/s/t/z/x) v cc > v th(max) , i source = 500 a 0.8 v cc v high (sgm811l/m/j) v cc > v th(max) , i source = 800 a v cc - 1.5 v low (sgm812r/s/t/z/x) 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/x/l/m/j) 1.8 v < v cc < v th(min) , i source = 150 a 0.8 v cc v
microprocessor supervisory with manual reset input 5 sgm811/812 sg micro corp www.sg-micro.com absolute maximum ratings (typical values are at t a = +25c, unless otherwise noted.) terminal voltage (with respect to ground) v cc .............................................................................-0.3v to 6v all other inputs.............................................-0.3v to v cc + 0.3v input current v cc , mr .............................................................................20ma output current reset , reset .................................................................20ma power dissipation, p d @ t a = +25 sot-23-5.............................................................................0.4w sot-143........................................................................... 0.32w operating temperature rang e.........................-40 to +125 junction temperature.......................................................150 storage temperature............ .............. ..............-65 to +150 lead temperature (soldering, 10s)...................................260 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 thos e indicated in the operational sections of the specifications is not implied. exposure to absolute maxi mum rating conditions for extended periods may affect device rel iability. caution this integrated circuit can be damaged by esd if you don?t pay attention to esd protection. sgmicro recommends that all integrated circuits be handled with appropriate precautions. fa ilure to observe proper handling and installation procedures can cause damage. esd damage can range from subtle performance degradation to complete device failure. precision integrated circuits may be more susceptible to damage because very small parametric changes could cause the device not to meet its published specifications. sgmicro reserves the right to make any chang e in circuit design, specification or other related things if necessary without not ice at any time. please contact sgmicro sales office to get the latest datasheet. pin description pin number sgm811 sgm812 function name sot-143 sot-23-5 sot-143 sot-23-5 gnd 1 1 1 1 ground nc 2 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 150ms after v cc rises above the reset threshold. reset ? ? 2 3 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 240ms (typical) after v cc rises above the reset threshold. mr 3 4 3 4 manual reset. this active low debounced input will ignore input pulses of 100ns 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 5 power supply voltage that is monitored.
microprocessor supervisory with manual reset input 6 sgm811/812 sg micro corp www.sg-micro.com 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 -50-30-101030507090110130 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 220 225 230 235 240 245 250 255 260 265 270 -50 -30 -10 10 30 50 70 90 110 130 temperature ( ) power-down reset (ms) sgm8_s 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)
microprocessor supervisory with manual reset input 7 sgm811/812 sg micro corp www.sg-micro.com typical performance characteristics reset output voltage vs. supply voltage 200ms/div 2v/div supply voltage reset output 5v p-p voltage sgm811s sgm811r
microprocessor supervisory with manual reset input 8 sgm811/812 sg micro corp www.sg-micro.com application information 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 loca ted 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 100ns and to accept inputs longer in duration than 10 s. very accurate reset threshold because the sgm811/sgm812 c an 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 refe rence 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 = 0v when v cc falls below 1.0 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 100k ? 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 output active for 240ms (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 240ms (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 1v. 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 in ternal 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 1v). this enables the part to be used with both 3v and 5v, or any nominal voltage within the minimum and maximum specifications for v cc .
microprocessor supervisory with manual reset input 9 sgm811/812 sg micro corp www.sg-micro.com package outline dimensions sot-23-5 e e1 e e1 b d a1 a2 a c l 0.2 recommended land pattern (unit: mm) 1.90 2.59 0.99 0.69 0.95 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 0.500 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 0.059 0.067 e1 2.650 2.950 0.104 0.116 e 0.950 bsc 0.037 bsc e1 1.900 bsc 0.075 bsc l 0.300 0.600 0.012 0.024 0 8 0 8
microprocessor supervisory with manual reset input 10 sgm811/812 sg micro corp www.sg-micro.com package outline dimensions sot-143 e b b1 d d e1 e1 e a a2 a1 l 0.250 c l1 recommended land pattern (unit: mm) 0.95 1.90 0.55 1.0 0.20 2.2 0.95 dimensions in millimeters dimensions in inches symbol min max min max a 0.900 1.150 0.035 0.045 a1 0.000 0.100 0.000 0.004 a2 0.900 1.050 0.035 0.041 b 0.300 0.500 0.012 0.020 b1 0.750 0.900 0.030 0.035 c 0.080 0.150 0.003 0.006 d 2.800 3.000 0.110 0.118 d 0.200 typ 0.008 typ e 1.200 1.400 0.047 0.055 e1 2.250 2.550 0.089 0.100 e 0.95 typ 0.037 typ e1 1.800 2.000 0.071 0.079 l 0.55 ref 0.022 ref l1 0.300 0.500 0.012 0.020 0 8 0 8
microprocessor supervisory with manual reset input 11 sgm811/812 sg micro corp www.sg-micro.com tape and reel information note: the picture is only for reference. please make the object as the standard. key parameter list of tape and reel package type reel diameter reel width w1 (mm) a0 (mm) b0 (mm) k0 (mm) p0 (mm) p1 (mm) p2 (mm) w (mm) pin1 quadrant sot-23-5 7 9.5 3.2 3.2 1.4 4.0 4.0 2.0 8.0 q3 sot-143 7 9.5 3.2 2.8 1.3 4.0 4.0 2.0 8.0 q3 reel width (w1) reel diameter reel dimensions tape dimensions direction of feed p2 p0 w p1 a0 k0 b0 q1 q2 q4 q3 q3 q4 q2 q1 q3 q4 q2 q1
microprocessor supervisory with manual reset input 12 sgm811/812 sg micro corp www.sg-micro.com carton box dimensions note: the picture is only for reference. please make the object as the standard. key parameter list of carton box reel type length (mm) width (mm) height (mm) pizza/carton 7 (option) 368 227 224 8 7 442 410 224 18

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