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microprocessor supervisory circuit r5108g series no. ea-171-080602 1 outline the r5108g series are cmos-based con supervisory circuit, or high accuracy and ultra low supply current voltage detector with built-in delay and watchdog timer. when the sense voltage is down across the threshold, or the watchdog timer does not detect the system clock from the con, the reset output is generated. the voltage detector circuit is used for the system reset, etc. the detector threshold is fixed internally, and the tolerance is 1.0%. the released delay time (power-on reset delay) circuit is built-in, and output delay time is adjustable with an external capacitor. when the sense voltage becomes the released voltage, the reset state will be maintained during the delay time. the time out period of the watchdog timer can be also set with an external capacitor. the output type of the reset is selectable, nch open-drain, or cmos. there is a function to stop supervising clock by the watchdog timer (inh function). a necessary voltage source can be supervised with sense pin. the package is small ssop-8g. features ? built-in a watchdog timer's time out period accuracy 30% ? timeout period for watchdog and generating a reset signal can be set by an external capacitor ? detector threshold voltage 0.1v stepwise setting in the range from 1.5v to 5.5v ? supply current typ. 11a ? operating voltage 1.5v to 6.0v ? high accuracy output voltage of detector threshold 1 .0% ? power-on reset delay time accuracy 20% ? power-on reset delay time of the voltage detector can be set with an external capacitor. ? small package ssop-8g (0.65mm pitch) application ? supervisory circuit for equipment with using microprocessors.
r5108g 2 block diagrams r5108gxxxa r5108gxxxc tw gnd vdd sck reset b clock detector watchdog timer - + inh sense cd - + tw gnd vdd sck resetb clock detector watchdog timer - + inh + - sense cd
r5108g 3 selection guide the selection can be made with designating the part number as shown below: r5108gxx 1x-tr part number a b c d code descriptions a designation of package type; g: ssop8g (2.9mmx4.0mm) b designation of detector threshold voltage (-v det ) 0.1v stepwise setting is possible in the range from 1.5v to 5.5v c designation of the output type of resetb a: nch open-drain c: cmos output d designation of taping type pin configuration ssop8g (0.65mm pitch) pin description pin no symbol pin description 1 resetb output pin for reset signal of watchdog timer and voltage detector. (output ?l? at detecting detector threshold and watchdog timer reset.) 2 sense voltage detector voltage sense pin 3 c d external capacitor pin for setting delay time of voltage detector 4 gnd ground pin 5 sck clock input pin from microprocessor 6 inh inhibit pin ("l": inhibit the watchdog timer) 7 tw external capacitor pin for setting reset and watchdog timeout periods 8 v dd power supply pin 1 2 3 8 7 6 sck inh vdd tw resetb gnd cd sense r5108gxxxa r5108gxxxc
r5108g 4 absolute maximum ratings topt=25 c, v ss =0v symbol item rating unit v in supply voltage -0.3 7.0 v v cd voltage of c d pin -0.3 v in +0.3 v v tw voltage of tw pin -0.3 v in +0.3 v v resetb output voltage voltage of resetb pin -0.3 7.0 v v sck voltage of sck pin -0.3 7.0 v v inh voltage of inh pin -0.3 7.0 v v sense input voltage voltage of sense pin -0.3 7.0 v i resetb output current current of resetb pin 20 ma p d power dissipation 300 mw topt operating temperature range -40 +105 c tstg storage temperature range -55 +125 c electrical characteristics r5108gxxxa/c unless otherwise specified, v in =6.0v, c tw =0.1uf, c d =0.1uf, rpull-up=100k ? , topt=25 c the number of bold font applied to the temperature range from -40 c to 105 c symbol item conditions min. typ. max. unit v in operating voltage 1.5 6.0 v iss supply current v in =(-v det )+0.5v clock pulse input 11 15 a voltage detector -v det detector threshold sense pin threshold x0.990 x0.972 x1.010 x1.015 v ? -v det / ? topt detector threshold temperature coefficient -40 c topt 105 c 100 ppm/ c v hys detector threshold hysteresis (-v det ) x0.03 (-v det ) x0.05 (-v det )x 0.07 v tp lh output delay time c d =0.1 f 340 370 467 ms v inl minimum operating voltage resetb 0.1v, pull-up=100k ? 0.6 0.9 v i doutn output current (resetb output pin) nch, v dd =1.2v, v ds =0.1v 0.38 0.80 ma i doutp output current (resetb output pin) nch, v dd =6.0v, v ds =0.5v(r5108gxxxc) 0.65 0.90 ma watchdog timer t wd watchdog timeout period c tw =0.1uf 230 310 450 ms t wr reset hold time of wdt c tw =0.1uf 29 34 48 ms v sckh sck input "h" v in x0.8 6.0 v v sckl sck input "l" 0.0 v in x0. 2 v v inhh inh input "h" 1.0 6.0 v
r5108g 5 symbol item conditions min. typ. max. unit v inhl inh input "l" 0.00 0.35 v r inh inh pull-up resistance 60 110 164 k ? t sckw sck input pulse width v sckl =v in x0.2, v sckh =v in x0.8 500 ns *bold type is guaranteed by design. typical applications test circuit supply current test circuit power s upply r c tw c cd sw r5108gxxxa series gnd v dd c d resetb sck tw inh sense p v dd i/o reset sense r5108gxxxc series gnd v dd c d resetb sck tw inh power supply c tw c cd sw p v dd i/o reset clock input r5108gxxxa/c series gnd v dd c d resetb sck tw inh sense c cd c tw r(r5108gx xxa) a
r5108g 6 timing diagram (r5108gxxxa/r5108gxxxc) (nch open-drain, resetb pin is pulled up to vdd.) tw sck vrefh n resetb tplh (1) (2) (4) (3) (5) (6) tphl +v det a -v det a tplh v dd c d twd twr twdi tplh
r5108g 7 operation when the sense pin voltage becomes more than the released voltage (+v det ), after the released delay time (or the power on reset time tplh), the output of resetb becomes ?h? level. when the sck pulse is input, the watchdog timer is cleared, and tw pin mode changes from discharge mode to charge mode. when the tw pin voltage becomes higher than vrefh, the mode will change into discharge, and next watchdog time count starts. unless the sck pulse is input, wdt will not be cleared, and during the charging period of tw pin, resetb="l". when the sense pin becomes lower than the detector threshold voltage, resetb outputs "l". if "l" signal is input to the inh pin, the resetb outputs "h", regardless the sck clock state. when the signal to the inh pin is set from "l" to "h", the watchdog starts supervising the system clock. ? watchdog timeout period/reset hold time the watchdog timeout period and reset hold time can be set with an external capacitor to tw pin. the next equations describe the relation between the watchdog timeout period and the external capacitor value, or the reset hold time and the external capacitor value. t wd(s) = 3.1*10 6 c (f) twr(s)=twd/9 the watchdog timer (wdt) timeout period is determined with the discharge time of the external capacitor. during the watchdog timeout period, if the clock pulse from the system is detected, wdt is cleared and the capacitor is charged. when the charge of the capacitor completes, another watchdog timeout period starts again. during the watchdog timeout period, if the clock pulse from the system is not detected, during the next reset hold time resetb pin outputs "l". after starting the watchdog timeout period, (just after from the discharge of the external capacitor) even if the clock pulse is input during the time period "twdi", the clock pulse is ignored. twdi[s]=twd/10 released delay time (power-on reset delay time) the released delay time can be set with an external capacitor connected to the cd pin. the next equation describes the relation between the capacitance value and the released delay time (tplh). tplh(s)=3.7 10 6 c(f) note that the temperature dependence graph in the typical characteristics does not contain the temperature characteristics of the external capacitor. minimum operating voltage (vinl) we specified the minimum operating voltage as the minimum input voltage in which the condition of resetb pin being 0.1v or lower than 0.1v. (herein, pull-up resistance is set as 100k ? in the case of the nch open-drain output type. inhibit (inh) function if inh pin is set at "l", the watchdog timer stops monitoring the clock, and the resetb output will be dominant by the voltage detector's operation. therefore, if the sense pin voltage is set at more than the detector threshold level, resetb outputs "h" regardless the clock pulse. inh pin is pulled up with a resistor (typ. 110k ? ) internally.
r5108g 8 sense function built-in voltage detector monitors the input voltage for sense pin. to obtain the normal detector threshold, vin 1.5v must be secured. resetb output resetb pin's output type is selectable either the nch open-drain output or cmos output. if the nch open-drain type output is selected, the resetb pin is pulled up with an external resistor to an appropriate voltage source. clock pulse input built-in watchdog timer is cleared with the sck clock pulse within the watchdog timeout period. application notes if a resistor is connected to the vdd pin, the operation might be unstable with the supply current of ic itself. connection examples affected by the conduction current r5108 vdd vin r1 resetb r5108 vdd vin r1 resetb r2 v in r5108 cmos output v dd r1 r2 resetb tplh v dd c d resetb perfect discharge det +v +v tcd tcd tplh1 power on reset operation against the input gtlitch (tplh1 < tplh ) 0v 0v 0v imperfect discharge -v det -v
r5108g 9 typical characteristics 1) supply current vs. input voltage 2) detector threshold vs. temperature r5 1 0xn 1 5 1 a/c, r5 1 0xg 1 5 1 a/c 0 2 4 6 8 1 0 1 2 1 4 1 6 1 8 20 0 1 23456 supply voltage [v] current iss [ua] 25 1 05 -50 r5 1 0xn30 1 a/c, r5 1 0xg30 1 a/a 0 2 4 6 8 1 0 1 2 1 4 1 6 1 8 20 0 1 23456 supply voltage [v] current iss [ua] 25 -50 1 05 r5 1 0xn 1 5 1 a/c, r5 1 0xg 1 5 1 a/c 1 . 4 7 0 1 . 480 1 . 4 9 0 1 . 500 1 . 5 1 0 1 . 520 1 . 530 -50 -25 0 25 50 7 5 1 00 1 25 te m perature [ ] d etect voltage [v] r5 1 0xn2 7 1 a/c, r5 1 0xg2 7 1 a/c 2 . 660 2 . 6 7 0 2 . 680 2 . 6 9 0 2 .7 00 2 .7 1 0 2 .7 20 2 .7 30 2 .7 40 -50 -25 0 25 50 7 5 1 00 1 25 te m perature [ ] d etect voltage [v] r5 1 0xn42 1 a/c r5 1 0xg42 1 a/c 4 . 1 20 4 . 1 40 4 . 1 60 4 . 1 80 4 . 200 4 . 220 4 . 240 4 . 260 4 . 280 -50 -25 0 25 50 7 5 1 00 1 25 te m perature [ ] d etect voltage [v]
r5108g 10 3) detector threshold hysteresis vs. temperature 4) detector threshold vs. input voltage r5 1 0xn 1 5 1 a/c r5 1 0xg 1 5 1 a/c 3 . 0 4 . 0 5 . 0 6 . 0 7. 0 -50 -25 0 25 50 7 5 1 00 1 25 te m perature [ ] h ysteresis [ % ] r5 1 0xn2 7 1 a/c r5 1 0xg2 7 1 a/c 3 . 0 4 . 0 5 . 0 6 . 0 7. 0 -50 -25 0 25 50 7 5 1 00 1 25 te m perature [ ] h ysteresis [ % ] r5 1 0xn42 1 a/c r5 1 0xg42 1 a/c 3 . 000 4 . 000 5 . 000 6 . 000 7. 000 -50 -25 0 25 50 7 5 1 00 1 25 te m perature [ ] h ysteresis [ % ] r5 1 08g 1 5 1 a/c 1 . 4 7 1 . 48 1 . 4 9 1 . 5 1 . 5 1 1 . 52 1 . 53 1 . 52 . 02 . 53 . 03 . 54 . 04 . 55 . 05 . 56 . 0 supply voltage v dd [v] d etect voltage [v] t opt= 25
r5108g 11 5) nch driver output current vs. v ds topt=25 c 6) nch driver output current vs. v dd 7) pch driver output current vs. v dd r5 1 0xn, r5 1 0xg 0 2 4 6 8 1 0 1 2 1 4 1 6 1 8 20 0 . 00 . 20 . 40 . 60 . 8 1 . 0 1 . 2 1 . 4 v d s [v] output current [ m a] vdd=1.0v vdd=6.0v vdd=5.0v vdd=4.0v vdd=3.0v vdd=2.0v vdd=1.5v r5 1 0xn, r5 1 0xg 0 2 4 6 8 1 0 1 2 1 4 1 6 1 8 20 0 1 23456 supply voltage v dd [v] output current [ m a] v d s = 0 . 3v 1 05 25 t opt= -40 r5 1 0xn, r5 1 0xg 0 2 4 6 8 1 0 1 2 1 4 1 6 1 8 20 0 1 23456 supply voltage v dd [v] output current [ m a] vds=0.5v 105 25 topt=-40 r5 1 0xn, r5 1 0xg 0 . 0 0 . 2 0 . 4 0 . 6 0 . 8 1 . 0 1 . 2 1 . 4 1 . 6 1 . 8 2 . 0 0 1 23456 supply voltage [v] output current [ m a] v d s = 0 . 3v 1 05 25 -40 r5 1 0xn, r5 1 0xg 0 . 0 0 . 2 0 . 4 0 . 6 0 . 8 1 . 0 1 . 2 1 . 4 1 . 6 1 . 8 2 . 0 0 1 23456 supply voltage [v] output current [ m a] v d s = 0 . 5v 1 05 25 -40
r5108g 12 8) released delay time vs. input voltage 9) released delay time vs. temperature 10) detector output delay time vs. temperature 11) wdt reset timer vs. temperature r5 1 0xn, r5 1 0xg 0 . 0 0 . 2 0 . 4 0 . 6 0 . 8 1 . 0 1 . 2 1 . 4 1 . 6 1 . 8 2 . 0 0 1 23456 supply voltage [v] output current [ m a] v d s = 1 . 0v 1 05 25 -40 r5 1 0xn, r5 1 0xg 300 320 340 360 380 400 420 440 460 480 500 0 1 23456 7 supply voltage [v] po w er on reset d elay tp l h [ m s] t opt= 25 r5 1 0xn, r5 1 0xg 300 320 340 360 380 400 420 440 460 480 500 -50 -25 0 25 50 7 5 1 00 1 25 1 50 te m perature [ ] po w er on reset d elay tp l h [ m s] v dd= 6v r5 1 0xn, r5 1 0xg 0 1 0 20 30 40 50 60 7 0 80 9 0 1 00 -50 -25 0 25 50 7 5 1 00 1 25 te m perature [ ] ti m e [us ec ] ( -v d et )+ 1 ( -v d et ) - 1 1 us input r5 1 0xn, r5 1 0xg 30 32 34 36 38 40 42 44 46 48 50 -50 -25 0 25 50 7 5 1 00 1 25 te m perature [ ] reset ti m e [ m s ec ]
r5108g 13 12) wdt timeout period vs. temperature 13) wdt reset timer vs. input voltage 14) wdt timeout period vs. input voltage r510xn, r510xg 200 220 240 260 280 300 320 340 360 380 400 -50 -25 0 25 50 75 100 125 temperature [ ] timeout period [msec] r5 1 0xn, r5 1 0xg 30 32 34 36 38 40 42 44 46 48 50 1 23456 supply voltage [v] reset ti m e [ m s ec ] r510xn, r510xg 200 220 240 260 280 300 320 340 360 380 400 123456 supply voltage [v] timeout period [msec]

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