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sgm708 low - cost, microprocessor supervisory circuit sg micro corp www.sg- micro.com december 2017 C r e v. a. 4 general description the sgm708 microprocessor supervisory circuit reduce s the complexity and number of components required to monitor power supply and monitor microprocessor activity. it significantly improve s system reliability and accuracy compared to separate ics or discrete components. the sgm708 provide s power supply monitoring circuitry that generate s a reset output during power - up, power - down and brownout conditions. the reset ou tput remains operational with v cc as low as 1 v. i n addition, there is a 1.25 v threshold detector for power - fail warning, low - battery detection, or monitor ing an additional power supply . an active - low manual - reset input ( mr ) is also incl uded. the sgm708 is available in green so ic - 8 package. it operate s over an ambient temperature range of - 40 to +85 . features precision supply - voltage monitor 4.65 v for sgm708 -l 4.40 v for sgm708 -m 4.0 v for sgm708 -j 3.08 v for sgm708 -t 2.93 v for sgm708 -s 2.63 v for sgm708 -r guaranteed reset valid at v cc = 1v 200 ms reset pulse width debounced ttl/cmos - compatible manual - reset input voltage monitor for power - fail or low - battery warning dual reset outputs : (active -l ow and active - high ) - 40 to + 85 operating temperature range a vailable in green soic - 8 package applications computers controllers intelligent instruments automotive systems critical p power monitoring a ll data sheet.com
low - cost, microprocessor sgm70 8 supervisory circuit 2 december 201 7 sg micro corp www.sg- micro.com package/ordering information model reset threshold (v) package description ordering number package marking packing option sgm708 4.65 soic -8 sgm708 -l ys8g /tr sgm708 -l ys8 tape and reel , 2500 4.40 soic -8 sgm708 -mys8g /tr sgm708 -mys8 tape and reel , 2500 4.0 soic -8 sgm708 -j ys8g /tr sgm708 -j ys8 tape and reel , 2500 3.08 soic -8 sgm708 -t ys8g /tr sgm708 -t ys8 tape and reel , 2500 2.93 soic -8 sgm708 -s ys8g /tr sgm708 -s ys8 tape and reel , 2500 2.63 soic -8 sgm708 -r ys8g /tr sgm708 -r ys8 tape and reel , 2500 green (rohs & hsf): sg micro corp defines "green" to mean pb - free (rohs compatible) and free of halogen substances. if you have additional comments or questions, please contact your sgmicro representative directly. note: order number is defined as the follow: order number sgm 708- x y x g / tr package type tape and reel s8 soic-8 operating temperature range y -40 to +85 reset threshold l: 4.65v m: 4.40v j: 4.0v t: 3.08v s: 2.93v r: 2.63v green product abs olute maximum ratings (typical values are at t a = +25 , unless otherwise noted.) terminal voltage (with respect to gnd) v cc ................................................................ - 0.3v to 6.0v all other inputs ................................ . - 0.3v to (v cc + 0.3v) input current , v cc ......................................................... 20ma gnd .......................................................................... 20ma output current, (all outputs) ......................................... 20ma operating temperature range ....................... -40 to +85 junction temperature ................................................. + 150 storage temperature range ........................ -65 to + 150 lead temperature ( s oldering, 10s) ............................ + 260 esd susceptibility hbm ............................................................................. 4 000v mm ................................................................................. 3 00v overstress caution stresses beyond those listed may cause permanent damage to the device. functional operation of the device at these or any other conditions beyond those indicated in the operational section of the specification is not implied. exposure to absolute maximum rating conditions for extended periods may affect reliability. esd sensitivity caution this integrated circuit can be damaged by esd if you dont pay attention to esd protection. sgmicro recommends that all integrated circuits be handled with appropriate precautions. failure to observe proper handling an d 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 no t to meet its published specifications. disclaimer sg micro corp reserves the right to make any change in circuit design, specification or other related things if necessary without notice at any time. a ll data sheet.com
low - cost, microprocessor sgm70 8 supervisory circuit 3 december 201 7 sg micro corp www.sg- micro.com typical application circuit v cc mr pfi pfo v cc unregulated dc +5 v dc linear regulator sgm 708 microprocessor pushbutton switch interrupt reset / reset reset / reset a ll data sheet.com
low - cost, microprocessor sgm70 8 supervisory circuit 4 december 201 7 sg micro corp www.sg- micro.com pin configuration sgm 708 (top view) sgm708 v cc 1 2 3 4 5 6 7 8 mr gnd pfi nc pfo reset reset soic - 8 pin description pin name function 1 mr manual - reset input triggers a reset pulse when pulled below 0.8 v. this active - low input has an internal 250 a (v cc = +5v) pull - up current. it can be driven from a ttl or cmos logic line as well as shorted to ground with a switch. 2 v cc power s upply v oltage that is monitored. 3 gnd 0v ground reference for all signals . 4 pfi power - fail voltage monitor input. when pfi is less than 1.25 v, pfo goes low. connect pfi to gnd or v cc when not used. 5 pfo power - fail output goes low and sinks current when pfi is less than 1.25 v; otherwise pfo stays high. 6 nc no connect. 7 reset active - low reset output pulses low for 200 ms when triggered, and stays low whenever v cc is below the reset threshold ( 4.65 v for sgm708 -l , 4.40 v for sgm708 -m , 4.0 v for sgm708 -j , 3.08 v for sgm708 - t, 2.93 v for sgm708 - s and 2.63 v for sgm708 -r ). it remains low for 200 ms after v cc rises above the reset threshold or mr goes from low to high. 8 reset active - high reset output is the inverse of reset . whenever reset is high, reset is low, and vice versa. a ll data sheet.com
low - cost, microprocessor sgm70 8 supervisory circuit 5 december 201 7 sg micro corp www.sg- micro.com electrical characteristics (v cc = 4.75 v to 5.5v for sgm708 -l; v cc = 4.5 v to 5.5v for sgm708 -m; v cc = 4.07 v to 5.5v for sgm708 -j; v cc = 3.14 v to 5.5v for sgm708 -t ; v cc = 2.95 v to 5.5v for sgm708 -s; v cc = 2.68 v to 5.5v for sgm708 -r; t a = -40 c to + 85 c, unless otherwise noted.) parameter conditions min typ max units operating voltage range (v cc ) 1.0 5.5 v supply current (i supply ) 20 60 a reset threshold (v rt ) sgm708 -l 4.5 4.65 4.75 v sgm708 -m 4.25 4.4 4.5 sgm708 -j 3.91 4.0 4.07 sgm708 -t 3.02 3.08 3.14 sgm708 -s 2.85 2.93 2.95 sgm708 -r 2.56 2.63 2.68 reset threshold hysteresis sgm708 - t, sgm708 - s, sgm708 -r 25 mv sgm708 -j 35 sgm708 - l, sgm708 -m 40 reset pulse width (t rs ) 120 200 290 ms reset output voltage i source = 800 a 0.7 v cc v i sink = 3.2ma 0.4 v cc = 1v, i sink = 50 a 0.3 reset output voltage i source = 800a 0.7 v cc v i sink = 1.2ma 0.4 v mr pull - up current mr = 0v 100 250 600 a mr pulse width (t mr ) 250 ns mr input threshold low t a = +25 0.8 v high 2 mr to reset out delay (t md ) 100 350 ns pfi input threshold v cc = 5v 1.17 1.25 1.3 v pfi input current 0.2 na pfo output voltage i source = 800 a 0.7 v cc v i sink = 3.2ma 0.4 a ll data sheet.com
low - cost, microprocessor sgm70 8 supervisory circuit 6 december 201 7 sg micro corp www.sg- micro.com functional block diagram + _ + _ sgm708 v cc 250a 1.25v 7 5 1 2 4 3 gnd pfi v cc 4.65v for sgm708-l * mr pfo reset generator reset 8 reset * 4.65v for sgm708-l 4.40v for sgm708-m 4.0v for sgm708-j 3.08v for sgm708-t 2.93v for sgm708-s 2.63v for sgm708-r a ll data sheet.com
low - cost, microprocessor sgm70 8 supervisory circuit 7 december 201 7 sg micro corp www.sg- micro.com typical performance characteristics v cc v cc 2k a ll data sheet.com
low - cost, microprocessor sgm70 8 supervisory circuit 8 december 201 7 sg micro corp www.sg- micro.com typical performance characteristics (continued) a ll data sheet.com
low - cost, microprocessor sgm70 8 supervisory circuit 9 december 201 7 sg micro corp www.sg- micro.com application information ensuring a valid reset output down to v cc = 0v when v cc falls below 1v, the sgm708 reset output no longer sinks current - it becomes an open circuit. high - impedance cmos logic inputs can drift to undetermined voltages if left undriven. if a pull - down resistor is added to the reset pin as shown in figure 1 , any stray charge or leakage currents will be drained to ground, holding reset low. resistor value (r1) is not critical. i t should be about 100k , large enough not to load reset and small enough to pull reset to ground. r1 sgm708 reset figure 1 . reset valid to ground circuit monitoring voltages other than the unregulated dc input monitor voltages other than the unregulated dc by connecting a voltage divider to pfi and adjusting the ratio appropriately. if required, add hysteresis by connecting a resistor (with a value approximately 10 ti mes the sum of the two resistors in the potential divider network) between pfi and pfo . a capacitor between pfi and gnd will reduce the power - fail circuits sensitivity to high - frequency noise on the line being monitored. reset can be asserted on other voltages in addition to the +5v v cc line. connect pfo to mr to initiate a reset pulse when pfi drops below 1.25v. figure 2 shows the sgm708 configured to assert reset when the +5v supply falls below the reset threshold, or when the +12v supply falls below approximately 11v. v cc mr pfo pfi reset +12v +5v 1m 1% 130k 1% to p gnd sgm708 figure 2 . monitoring both +5v and +12v monitoring a negative voltage the power - fail comparator can also monitor a negative supply rail ( figure 3 ). when the negative rail is good (a negative voltage of large magnitude), pfo is low, and when the negative rail is degraded (a negative voltage of lesser magnitude), pfo is high. by adding the resistors and transistor as shown, a high pfo triggers reset. as long as pfo remains high, the sgm708 will keep reset asserted ( reset = low, reset = high). note that this circuits accuracy depends on the pfi threshold tolerance, the v cc line, and the resistors. v cc mr pfo pfi +5v gnd sgm708 r1 r2 v- 100k 100k to p +5v 0v +5v 0v v- v trip 0v mr pfo 5 C 1.25 r1 1.25 - v trip r2 v trip < 0 = 2n3904 reset figure 3 . monitoring a negative voltage interfacing to ps with bidirectional reset pins ps with bidirectional reset pins, such as the motorola 68hc11 series, can contend with the sgm708 reset output. if, for example, the reset output is driven high and the microprocessor wants to pull it low, indeterminate logic levels may result. to correct this, connect a 4.7k? resistor between the reset output and the p reset i/o, as in figure 4 . buffer the reset output to other system components. v cc reset microprocessor gnd sgm708 v cc reset gnd 4.7k buffred reset to other system components figure 4 . interfacing to microprocessor s with bidirectional reset i/o a ll data sheet.com
low - cost, microprocessor sgm70 8 supervisory circuit 10 december 201 7 sg micro corp www.sg- micro.com revision history note: page numbers for previous revisions may differ from page numbers in the current version. december 201 7 ? rev.a. 3 to rev.a. 4 changed electrical characteristics section .......................................................................................................................................................... 5 january 201 3 ? rev.a. 2 to rev.a. 3 added recommended land pattern information .............................................................................................................................................. 10 added tape and reel information ............................................................................................................................................................... 11, 12 march 201 1 ? rev.a.1 to rev.a.2 updated package description ........................................................................................................................................................................... all may 201 0 ? rev.a to rev.a.1 added reset threshold ..................................................................................................................................................................................... all changes from original ( april 2010 ) to rev.a changed from product preview to production data ............................................................................................................................................. all a ll data sheet.com
package information tx00010.000 sg micro corp www.sg- micro.com package outline dimensions soic -8 symbol dimensions in millimeters dimensions in inches min max min max a 1.350 1.750 0.053 0.069 a1 0.100 0.250 0.004 0.010 a2 1.350 1.550 0.053 0.061 b 0.330 0.510 0.013 0.020 c 0.1 70 0.250 0.00 6 0.010 d 4.7 00 5. 1 00 0.18 5 0.200 e 3.800 4.000 0.150 0.157 e1 5.800 6. 2 00 0.228 0.24 4 e 1.27 bsc 0.050 bsc l 0.400 1.270 0.016 0.050 0 8 0 8 d e e1 e b a a2 a1 c l 1.27 0.6 2.2 5.2 recommended land pattern (unit: mm) a ll data sheet.com
package information tx10000.000 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 dd0001 soic -8 13 12.4 6.4 0 5.4 0 2.1 0 4.0 8.0 2.0 12.0 q1 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 a ll data sheet.com
package information tx20000.000 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 dd0002 13 386 280 370 5 a ll data sheet.com

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