mitsumi system reset (with battery back-up) mm1026, 1245, 1080, 1134 system reset (with battery back-up) monolithic ic mm1026, 1245, 1080 ,1134 outline these ics protect s-ram data in back-up mode (cs signal makes r-sam ce pin low and ce - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - pin high) when power supply voltage goes below a certain set voltage (detection voltage 3.5v, 4.2v or 4.5v typ.). further, it switches from main power supply to battery back-up when power supply voltage drops. conversely, when power supply rises, it first switches the s-ram from battery back-up to main power supply (switching voltage 3.3v typ.), then from back-up mode to normal mode (cs signal makes s-ram ce pin high and ce pin low). these signal processes provide reliable protection against data damage. features mm1026 ? power supply switching circuit (switching between main power supply and battery) ? cs control for s-ram (normal mode : s-ram can be accessed; back-up mode: s-ram can not be accessed low current consumption mode) ? reset output mm1245 ? power supply switching circuit ? cs control for s-ram ? cs control signal delay, power supply line chattering removal approx. 1s max. ? supply current from main power supply can be increased by external power transistor mm1080 ? power supply switching circuit ? cs control for s-ram ? low current consumption 60a typ. mm1134 ? power supply switching circuit ? cs control for s-ram ? gate circuit with cs signal characteristics 1. battery back-up 1. low ic current consumption (loss current) 0.3a typ. 2. drop voltage inside ic (input/output voltage difference) i o =100a 0.3v typ. 3. reverse current (reverse leak current) 0.1a max. 2. normal operation 1. drop voltage inside ic (input/output voltage difference) i o =50a 0.2v typ. 2. output voltage v cc =5v i o =50ma 4.8v typ. 3. battery-v cc switching voltage 3.3v typ. 4. detection voltage (cs, cs - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - , reset output) a : 3.5v typ. b : 4.2v typ. c : 4.5v typ.
mitsumi system reset (with battery back-up) mm1026, 1245, 1080, 1134 package dip-8b (mm d) sop-8c (mm f) * contains detection voltage rank. applications 1. memory cards (s-ram cards) 2. pcs, word processors 3. fax machines, photocopiers, other office equipment 4. sequence controllers, other fa equipment 5. video games and other equipment with s-rams pin no. pin name mm1026 mm1245 mm1080 mm1134 1 gnd gnd gnd gnd 2 reset t c nc reset 3 cs cs cs cs 4 v batt v batt v batt v batt 5 cs cs nc cs 6 v out v out v out v out 7 nc tr.b nc y 8 v cc v cc v cc v cc pin assignment 14 3 2 85 6 7 dip-8p(c)/sop-8p(c)/sop-8p(c) taping block diagram mm1026
mitsumi system reset (with battery back-up) mm1026, 1245, 1080, 1134 mm1080 mm1134 mm1245
mitsumi system reset (with battery back-up) mm1026, 1245, 1080, 1134 equivalent circuit diagram mm1026 mm1245
mitsumi system reset (with battery back-up) mm1026, 1245, 1080, 1134 absolute maximum ratings (ta=25 c) item symbol rating units storage temperature t stg - 40~+125 c operating temperature t opr - 20~+75 c power supply voltage v cc max. 7 v operating voltage v ccop 7v allowable loss pd 300 mw mm1245 output current mm1026 i o 1 80 ma mm1134 mm1080 50 ma output current i o 2 200 a note : i o 1 expresses v cc output current value, and i o 2 expresses v batt output current value. mm1080 mm1134
mitsumi system reset (with battery back-up) mm1026, 1245, 1080, 1134 electrical characteristics (except where noted otherwise, ta=25c, v cc =v rs =5v, r rs =10k ) item symbol measurement conditions min. typ. max. units mm1026 2.0 ma consumption mm1245 i cc v cc =5v, v batt =3v, i o 1=0ma 0.6 1.0 1.4 ma current mm1080 60 120 a mm1134 1.4 2.2 ma i/o voltage difference 1 v sat 1v cc =5v, v batt =3v, i o 1=1ma 0.03 0.05 v output voltage 1 v o 1v cc =5v, v batt =3v, i o 1=1ma 4.95 4.97 v i/o voltage difference 2 mm1245 v sat 2v cc =5v, v batt =3v, i o 1=30ma 0.15 0.30 v mm1026 output voltage 2 mm1134 v o 2 v cc =5v, v batt =3v, i o 1=15ma 4.75 4.90 v mm1080 v cc =5v, v batt =3v, i o 1=30ma 4.5 4.7 v i/o voltage difference 3 mm1245 v sat 3v cc =5v, v batt =3v, i o 1=80ma 0.30 0.50 output voltage 3 except mm1245 v o 3v cc =5v, v batt =3v, i o 1=50ma 4.7 4.8 v a type 3.35 3.50 3.65 v detection voltage b type v s v cc =h l 4.05 4.20 4.35 v c type 4.30 4.50 4.70 v hysteresis voltage v s v cc =l h 100 mv maximum base driving current mm1245 i buf v cc =5v, v buf =4.5v 14 20 26 ma reset output voltage l mm1026 v rsl v cc =3v 0.2 0.4 v reset leakage current h mm1134 i rsh v cc =5v, v rs =7.0v 0.01 0.1 a reset operation limit voltage v opl v rsl < = 0.4v, v cc =h l 0.8 1.2 v cs output voltage l v csl v cc =3.7v, v batt =3v, i cs =1a 0.1 v cs output voltage h v csh v cc =5v, v batt =3v, i cs = - 1a 4.90 v cs - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - output voltage l v csl v cc =5v, v batt =3v, i cs =1a 0.1 v cs - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - output voltage h v csh v cc =3.7v, v batt =3v, i cs = - 1a v o - 0.1 v detection voltage temperature characteristic v s / t 0.05 %/ c on delay time mm1245 td on ctc=open 50 s off delay time td off ctc=open 5 s t c pin charge current mm1245 i tc v cc =5v, v batt =3v, v tc =0v 0.60 0.80 1.10 a cs source current i cssou v cc =5v, v batt =3v, v cs =4.5v 25 50 80 a power supply switching voltage v b v cc =h l 3.15 3.30 3.45 v hysteresis voltage v b v cc =l h 100 mv switching voltage temperature characteristic v b / t 0.05 %/ c loss current i bl v cc =0v, v batt =3v, i o 2=0a 0.1 a i/o voltage difference 2 vsat2 v cc =0v, v batt =3v, i o 2=1a 0.2 0.3 v output voltage 4 v 0 4v cc =0v, v batt =3v, i o 2=1a 2.7 2.8 v output voltage 5 v 0 5v cc =0v, v batt =3v, i o 2=100a 2.6 2.7 v reverse current i orev v cc =5v, v batt =0v 0.1 a y - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - pin l o h level current mm1134 i ylo v cc =5v, v batt =3v, v y =0v 150 400 a reference voltage (typical) v ref 1.25 v mm1080 (cs only) mm1026 mm1245 mm1134 note : detection voltage ranks a, b mm1026 b mm1134, mm1080 b , c mm1245
mitsumi system reset (with battery back-up) mm1026, 1245, 1080, 1134 timing chart v cc reset cs v out cs 0v 0v 0v 0v v s v b v opl v e v s v rsl v csh v csl v csh v o1,o2,o3 v rsh v csl v o4,o5 v cc t c cs v out cs v e v s v s v b v opl v th v csl v csl v o1,o2,o3 v csl v o4,o5 v csl set inside ic delay v cc v s v b battery cs v out v s v csl v csl v o1,o2 v o3,o4 v e 0v 0v 0v 0v 2.8v 4.8v v cc y cs v out cs v e v s v s v b v opl v csl v csl * v y v o1,o2,o3 v o4,o5 v csl v rsl v csl 0v 0v 0v 0v 0v reset mm1026 mm1245 mm1080 mm1134 characteristics (mm1026, mm1134 series) v out (v) 3.000 0.100/div 2.000 i out (ma) 0 1.000 0.100/div v out (v) (v) 5.000 .0500/div 4.500 i out (ma) .0000 - 100.0 10.00/div v out -i out (v cc =5.0v) v out -i out (v bat =3.0v) * use y - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - pin input voltage at less than 5v when v cc < = vs.
mitsumi system reset (with battery back-up) mm1026, 1245, 1080, 1134 i bat (na) 40.00 5.000/div - 10.00 0 v cc (v) 0 10.00 1.000/div v cc -i bat i cc (ma) 5.000 .5000/div .0000 .0000 v cc (v) 10.00 1.000/div v cc -i cc 2.0 1.0 0.0 - 50 0 50 100 current consumption (ma) ambient temperature ( c) current consumption-temperature characteristics i ol =50ma i ol =10ma 0.3 0.2 0.1 - 50 0 50 100 output voltage 1, 2 (v) ambient temperature ( c) output voltage 1, 2-temperature characteristics i ol =100 a i ol =1 a - 50 0 50 100 0.2 0.1 0 0.5 0.4 0.3 output voltage 3, 4 (v) ambient temperature ( c) output voltage 3, 4-temperature 10na 100na 1 a - 80 - 50 0 50 100 reverse current ambient temperature ( c) reverse current-temperature 10na 100na 1 a - 80 - 50 0 50 100 loss current ambient temperature ( c) loss current-temperature
mitsumi system reset (with battery back-up) mm1026, 1245, 1080, 1134 5.000 0.5000 0.0000 .0000 /div v out (v) 100.0 i out 10.00/div (ma) current consumption-temperature (vcc=5v) 100.0 10.00 .0000 .0000 5.000 /div i in ( a) v in .5000/div (v) v in -i in 5.000 .0000 .0000 /div v out (v) .5000 200.0 i out 20.00/div ( a) v out -i out (v bat -3.0v) 1.000 .2000 - 1.000 .0000 /div i batt ( a) 5.000 v in .5000/div (v) 0 v in -i batt - 25 0 25 50 75 temp ( c) ( a) 80 70 60 50 current consumption-temperature (v cc =5v) hysteresis voltage (v) 3.3 3.2 3.1 3.0 - 250 255075 temp ( c) 50 100 150 (mv) hysteresis voltage vbat detection voltage v bat detection voltage-temperature hysteresis voltage (v) 4.5 4.0 3.5 - 25 0 25 50 75 temp ( c) 100 150 (mv) hysteresis voltage cs detection voltage cs detection voltage-temperature characteristics (mm1080 series)
mitsumi system reset (with battery back-up) mm1026, 1245, 1080, 1134 5.00 4.90 4.80 4.70 4.60 4.50 4.40 4.30 4.20 4.10 4.00 5 25456585105125 v out i out (ma) i out -v out 1.5 1.4 1.3 1.2 1.1 1.0 0.9 0.8 - 250 255075 temperature ( c) v out -cs 47k cs open current consumption (ma) current consumption-temperature 4.4 4.35 4.3 4.25 4.2 4.15 4.1 - 25 0 25 50 75 voltage (v) temperature ( c) cs detection voltage-temperature off delay time 10 1 100m 10m 1m 100 10 1 1 0.1 0.01 0.001 100p 10p use 1s max. for cs-cs pin on delay time. delay time (s) capacitance (f) on delay time cs-cs pin on/off delay time vs. capacitance tc 3.5 3.45 3.4 3.35 3.3 3.25 3.2 - 25 0 25 50 75 voltage (v) temperature ( c) v bat detection voltage-temperature characteristics (mm1245 series)
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