mitsumi system reset pst90xx system reset monolithic ic pst90xx series outline the function of this low voltage detection type ic is to accurately reset systems after detecting the supply voltage at the time of switching power on and instantaneous power off in various cpu and other logic systems. this ic, with its super low consumption current and high precision voltage detection capacity, is most suited as a voltage check circuit for a number of products which use batteries. features 1. high precision voltage detection v s ?.5% max. 2. super low current consumption i cch =1.5? typ. i ccl =1? typ. 3. low operating threshold voltage 0.7v max. 4. hysteresis voltage is provided as a detect voltage vs 5% typ. 5. the detect voltage can be selected at your discretion at 0.1 v step within the range of 0.8 to 1.8v by the following stipulation method. pst90xx detected voltage value (example : for 0.8v pst9008) package to-92a (pst90 ) sot-25a (pst90 n) applications 1. reset circuits for microcomputers, cpu and mpu. 2. reset circuit for logic circuitry. 3. battery voltage check circuit. 4. circuit for changing over to backup battery. 5. level detecting circuit. pin assignment 123 to - 92a 54 123 sot - 25a (top view) 1 v out 2 v cc 3 gnd note : the pin 2 of sot-25 package is a sub terminal. connect it to gnd. 1 nc 2 sub 3 gnd 4 v out 5 v cc
mitsumi system reset pst90xx absolute maximum ratings (ta=25 c) electrical characteristics (ta=25 c) (the unit of resistance is ? unless otherwise indicated.) equivalent circuit diagram item symbol ratings units storage temperature t stg - 40~+125 c operating temperature t opr - 20~+75 c supply voltage v cc max. - 0.3~10 v allowable loss pd 150 (sot-25a) mw 300 (to-92a) item symbol measurement measurement conditions min. typ. max. unit circuit pst9008 0.8 pst9009 0.9 pst9010 1.0 pst9011 1.1 r l =4.7k pst9012 - 2.5% 1.2 +2.5% detection voltage v s 1v cc =h l pst9013 typ. 1.3 typ. v v ol < = 0.4v pst9014 1.4 pst9015 1.5 pst9016 1.6 pst9017 1.7 PST9018 1.8 hysteresis voltage v s 1 r l =4.7k v s v s typ. v s mv v cc =l h l 0.5 0.05 2 detection voltage v s / t 1 r l =4.7k ?.01 %/ c temperature coefficient ta= - 20 c~+75 c low level v o l1 v cc =vs min. - 0.02v 0.2 0.4 v output voltage r l =4.7k output leakage current i o h1 v cc =10v 0.1 ? circuit current at on time i ccl 1 v cc =vs min. - 0.02v i ol =0ma 1.0 2.0 ? circuit current at i cch 1 vs=0.8~1.2 v cc =1.5v, r l = 1.0 2.0 ? off time vs=1.3~1.8 v cc =3.0v, r l = "h" transmission delay time tplh 2 c l =100pf, r l =4.7k 10 20 50 ? "l" transmission delay time tphl 2 c l =100pf, r l =4.7k 20 50 80 ? operating threshold voltage vopl 1 r l =4.7k, v ol < = 0.4v 0.65 0.70 v output current at i o l1 1 r l =0 0.3 ma on time 1 v cc =vs min. - 0.02v output current at i o l2 1 v cc =vs min. - 0.02v 0.2 ma on time 2 r l =0, ta= - 20 c~+75 c
mitsumi system reset pst90xx equivalent circuit characteristics (example: pst9008) - 20 - 100 10203040506070 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 ta ( c) vopl (v) - 20 - 100 10203040506070 0 10 20 30 40 50 60 70 ta ( c) v s (mv) v s vs. ta v o pl vs. ta - 20 - 100 10203040506070 0 0.5 1 1.5 2 2.5 3 ta ( c) i cch ( a) i cch vs. ta - 20 - 100 10203040506070 0 0.5 1 1.5 2 2.5 3 ta ( c) i ccl ( a) - 20 - 100 10203040506070 0.77 0.78 0.79 0.80 0.81 0.82 0.83 ta ( c) v s (v) v s vs. ta i ccl vs. ta
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