mitsumi system reset with delay time circuit pst596~598 system reset with delay time circuit monolithic ic pst596~598 series outline package sot-25a (pst59 n) (with manual reset pin) * the box represents a rank of detection voltage. applications 1. reset circuits for microcomputers, cpus and mpus 2. reset circuits for logic circuits 3. battery voltage check circuits 4. back-up power supply switching circuits 5. level detection circuits 6. mechanical reset circuits this ic functions in a variety of cpu systems and other logic systems, to detect supply voltage and reset the system accurately when the power is turned on or interrupted. it incorporates a fixed-delay time generation circuit. in particular, this ic is a system reset ic which realizes ultra-small size and low current consumption. features 1. fixed delay time setting by counter timer 2. low operating limit voltage 0.65v typ. 3. hysteresis voltage provided for detection voltage 50mv typ. 4. low current consumption i cch =15 a typ. 5. 3 models are available for different delay times. pst596 50ms pst597 100ms pst598 200ms 6. each model has 10 detection voltage ranks. 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. july 21, 2000
mitsumi system reset with delay time circuit pst596~598 equivalent circuit diagram v cc gnd sub 2 1 4 3 5 v out m/r osc t q r delay 54 3 2 1 sot - 25 ( top view ) 1 m/r 2 sub 3 gnd 4 v out 5 v cc 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~+12 v manual reset input voltage v res max. ?0.3~+12 v allowable loss pd 150 mw pin assignment pin no. pin name function 1 m/r manual reset pin 1 2 sub sub pin 2 3 gnd gnd pin 4 v out reset signal output pin 5 v cc power supply pin/voltage detection pin 1 : note that the oscilloscope may mis-operate if the m/r pin falls below ?0.3v. 2 : connect to gnd. pin description absolute maximum ratings (except where noted otherwise ta=25c)
mitsumi system reset with delay time circuit pst596~598 recommended operating conditions item symbol ratings units operating temperature t opr - 20~+75 c power supply voltage v cc - 0.3~+12 v item symbol measuring circuit measurement conditions min. typ. max. units detection voltage vs 1 v cc =h l r l =470 v ol 0.4v c4.34.54.7 v d4.04.24.4 e3.73.94.1 f3.43.63.8 g3.13.33.5 h2.93.13.3 i2.752.903.05 j2.552.702.85 k2.352.502.65 l2.152.302.45 hysteresis voltage vs 1 v cc =l h l, r l =470 30 50 100 mv detection voltage temperature coef? cient vs/ t1 r l = 470, ta=?20c~+75c 0 . 01 %/c low-level output voltage v ol 1 v cc =vs min. ?0.05v, r l =470 0.1 0.4 v output leakage current i oh 1v cc =10v 0.1 a circuit current while on i ccl 1 v cc =vs min. ?0.05v, r l = 300 500 a circuit current while off i cch 1 v cc =vs typ. / 0.85v, r l = 15 25 a "h" transport delay time t plh 2 r l =4.7k c l =100pf 1 pst596 30 50 75 ms pst597 60 100 150 pst598 120 200 300 "l" transport delay time t phl 2r l =4.7k, c l =100pf, 220s operating power supply voltage v opl 1r l =4.7k, v ol 0.4v 0.65 0.85 v output current while on 1 i ol 11v cc =vs min. ?0.05v, r l =0 8 ma output current while on 2 i ol 21 v cc =vs min. ?0.05v, r l =0 ta=?20~+75c 6ma m/r pin input h voltage v resh 2.0 v m/r pin input h current i resh v resh =2.0v 10 60 a m/r pin input low voltage v resl ?0.3 0.8 v 1 : t plh ; v cc = (vs typ.?0.4v) (vs typ.+0.4v) 2 : t plh ; v cc = (vs typ.+0.4v) (vs typ.?0.4v) note 3: connect manual reset pin to gnd when not using. electrical characteristics (ta=25c) (except where noted otherwise, resistance unit is )
mitsumi system reset with delay time circuit pst596~598 v cc v1 a1 a2 v2 r l v res 1 2 3 4 5 pst 59x + 10? /10v [1] input pulse 5.0v crt r l c l =100pf 10? /10v pst 59x 1 2 3 4 5 a : dc ammeter v : dc voltmeter crt : osciloscope + [2] 0v + 0.4v - 0.4v v s typ v s typ input pulse m/r v v res v v time v out t plh t plh t plh v cc v s v s note : thoroughly check the actual operation of the circ uit, then set the manual reset when pressing the manual switch on to about 15 s. timing chart measuring circuit
mitsumi system reset with delay time circuit pst596~598 application circuits 1. normal hard reset to pst 59x 1 2 3 4 5 v cc r l to cpu reset pin note : connect a capacitor between ic v cc and gnd pins if v cc line impedance is high. 2. manual reset to pst 59x 1 2 3 4 5 v cc r l to cpu reset pin manual sw clamp diode( * ) v out pin low for manual switch on. v out pin high for manual switch off. note1 : mount a clamp diode if it is possible that the m/r pin might go below ?0.3v. note2 : thoroughly check the actual operation of the circuit, then set the manual reset when press- ing the manual switch on to about 15?. v cc vs v out v out v s v s v cc characteristics
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