mitsumi system reset pst600 system reset monolithic ic pst600 outline this ic operates in a variety of cpu systems and other logic systems by detecting power supply voltage, so that the system can be reset accurately when power is turned on or when power is momentarily cut. pst572 and others perform the same function as does this series, but this ic is a low reset type system resetting ic which follows load current so that circuit current flow increases for on, and has low current consumption for both on and off. features 1. follows load current so that circuit current flow increases for on, and has low current consumption for both on and off. no load : i ccl =7? typ.; i cch =5? typ. 2. low operating limit voltage 0.65v typ. 3. hysteresis voltage provided in detection voltage 50mv typ. 4. the following 10 ranks of detection voltages are available. pst600 c : 4.5v typ. h : 3.1v typ. d: 4.2v typ. i : 2.9v typ. e : 3.9v typ. j : 2.7v typ. f: 3.6v typ. k : 2.5v typ. g: 3.3v typ. l : 2.3v typ. package mmp-3a (pst600 m) to-92a (pst600 ) * contains detection voltage rank. applications 1. microcomputers, cpu, mpu reset circuits 2. logic circuit reset circuits 3. battery voltage check circuits 4. back-up power supply switching circuits 5. level detection circuits equivalent circuit
mitsumi system reset pst600 absolute maximum ratings (ta=25 c) electrical characteristics (ta=25 c) (unless otherwise indicated resistance unit is ? ) * 1 t plh : v cc = (vs typ. - 0.4v) (vs typ.+0.4v), t plh : v cc = (vs typ.+0.4v) (vs typ. - 0.4v) * 2 v cc =vs min. - 0.15v pin assignment 123 to - 92a 3 1 2 mmp-3a (top view) 1 v cc 2 gnd 3 v out 1 v cc 2 gnd 3 v out item symbol ratings units storage temperature t stg - 40~+125 c operating temperature t opr - 20~+75 c power supply voltage v cc max. - 0.3~10 v allowable loss pd 200 (mmp-3a) mw 300 (to-92a) item symbol measurement measurement conditions min. typ. max. units circuit pst600c 4.3 4.5 4.7 pst600d 4.0 4.2 4.4 pst600e 3.7 3.9 4.1 r l =470 pst600f 3.4 3.6 3.8 detection voltage vs 1 v ol < = 0.4v pst600g 3.1 3.3 3.5 v v cc =h l pst600h 2.9 3.1 3.3 pst600i 2.75 2.90 3.05 pst600j 2.55 2.70 2.85 pst600k 2.35 2.50 2.65 pst600l 2.15 2.30 2.45 hysteresis voltage vs 1 r l =470, v cc =l h l 30 50 100 mv detection voltage temperature coefficient vs/ t 1 r l =470, ta= - 20 c~+75 c ?.01 %/ c low level output voltage v ol 1 v cc =vs min. - 0.05v, r l =470 0.3 0.4 v output leak current i oh 1v cc =10v ?.1 ? circuit current for on i ccl 1 v cc =vs min. i ol =0ma 7 14 ? - 0.05v i ol =8ma 50 130 circuit current for off i cch 1v cc =vs typ./0.85v, r l = 510 a h transmission delay time t plh 2r l =4.7k, c l =100pf * 1204080 s l transmission delay time t phl 2r l =4.7k, c l =100pf * 1102040 s operating limit voltage vopl 1 r l =4.7k, v o l < = 0.4v 0.65 0.85 v output current 1 for on i ol 11v cc =vs min. - 0.05v, r l =0 8 ma output current 2 for on i ol 21 ta= - 20 c ~+75 c , r l =0 * 2 6ma
mitsumi system reset pst600 measurement circuit [1] [2] characteristics (pst600c is used as the representative model for characteristics examples.) - 40 - 20 0 20 40 60 80 4.2 4.3 4.4 4.5 4.6 4.7 v s (v) ta( c) v s (mv) ta ( c) - 40 - 20 0 20 40 60 80 20 30 40 50 60 70 80 v s vs. ta v s vs. ta v o l (mv) ta ( c) - 40 - 20 0 20 40 60 80 200 250 300 350 400 450 ta = - 25 c ta = 25 c ta = 75 c 8 7 6 5 4 3 2 1 0 0 12345678 vout (v) v cc (v) v cc vs. v out v o l vs. ta v s 0v 4.9 4.1 * the input model is an example of pst600c (mmp-3p). i cc h ( a) ta( c) - 40 - 20 0 20 40 60 80 3 4 5 6 7 8 i cc l ( a) i o l (ma) 02 4681012 0 20 40 60 80 100 i cc l vs. i o li cc h vs. ta
mitsumi system reset pst600 i cc l ( a) ta ( c) - 40 - 20 0 20 40 60 80 4 5 6 7 8 9 i cc l (i o l=0ma) vs. ta v o l (mv) i o l (ma) 02 4681012 0 100 200 300 400 500 i o l (ma) ta ( c) - 40 - 20 0 20 40 60 80 10 20 30 40 50 60 i o l vs. ta v o l vs. i o l application circuits 1. normal hard reset delay time (tplh) c l : ? vs cpu : cpu, mpu reset threshold voltage r l : k ? voltage : v note : when v cc line impedance is high, connect a capacitor between ic pins 1 and 2. 2. manual reset note : prevent manual sw chattering by using r l , c l and rm. rm setting conditions are as follows : rm < = 1/20 r l note : when v cc line impedance is high,connect a capacitor between ic pins 1 and 2. v cc = c l r l [ ln ] +0.040 (ms) v cc - (vs cpu +0.2)
mitsumi system reset pst600 3. battery checker (led on for high voltage) note : when v cc line impedance is high, connect a capacitor between ic pins 1 and 2. 4. battery checker (led on for low voltage) note : when v cc line impedance is high, connect a capacitor between ic pins 1 and 2.
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