mitsumi system reset pst91xx system reset monolithic ic pst91xx series outline the function of this low reset 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. further, 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 vs?% max. 2. super low current consumption i cch =1.5? typ. i ccl =1.0? typ. 3. low operating threshold voltage 0.65v typ. 4. hysteresis voltage is provided as a detect voltage 50mv typ. 5. large output current at the time on 15ma typ. 6. the detect voltage can be selected at your discretion at 0.1v step within the range of 1.9 to 4.6v by the following stipulation method. pst91xx detected voltage value (example : for 4.2v pst9142) package to-92a (pst91 ) sot-25a (pst91 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) (note) the pin 2 of sot-25 package is a sub terminal. connect it to gnd. 1 v out 2 v cc 3 gnd 1 nc 2 sub 3 gnd 4 v out 5 v cc
mitsumi system reset pst91xx 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 power supply voltage v cc - 0.3~+10 v allowable loss pd 150 (sot-25a) mv 300 (to-92a) item symbol measurement measurement conditions min. typ. max. units circuit 4.6~ detection voltage v s 1 r l =470, v ol < = 0.4v - 3% 1.9 +3% v v cc =h l typ. (0.1v typ. step) hysteresis voltage v s 1r l =470, v cc =l h l 30 50 100 mv detection voltage temperature coefficient * 1 v s / t 1 r l =470, ta= - 20~+75 c ?.01 %/ c low level output voltage v ol 1 v cc =v s min. - 0.05v, r l =470 0.2 0.4 v output leakage current i oh 1v cc =10v, v o =v cc ?.1 ? circuit current at on time i cc l1 v cc =v s min. - 0.05v, r l = 1.0 2.0 ? circuit current at off time i cc h1v cc =v s typ./0.85v, r l = 1.5 2.5 ? "h" transmission delay time tplh 2 c l =100pf, r l =4.7k 20 60 ? "l" transmission delay time tphl 2 c l =100pf, r l =4.7k 20 60 ? operating threshold voltage v op l1 r l =4.7k, v ol < = 0.4v 0.65 0.85 v output current at on time 1 i o l1 1 v o =0.4v r l =0, 5 ma v cc =v s min.-0.05v, v o =0.4v output current at on time 2 * 1 i o l2 1 ta= - 30~+80 c , v o =0.4v 3ma r l =0, v cc =v s min. - 0.15v note: * some models have an expanded temperature range ( - 30 ~ +85 c). note: * 1 some models have an expanded temperature range ( - 30 ~ +80 c).
mitsumi system reset pst91xx application circuits characteristics (example: pst9145) - 20 - 100 10203040506070 0 10 20 30 40 50 60 70 80 90 100 ta ( c) v s (mv) - 20 - 100 10203040506070 0 0.5 1 1.5 2 2.5 3 ta ( c) i cc h ( a) i cc h vs. ta v s vs. ta - 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) v o pl vs. ta - 20 - 100 10203040506070 60 80 100 120 140 160 180 200 220 240 ta ( c) v o l (mv) v o l vs. ta - 20 - 100 10203040506070 20 25 30 35 40 ta ( c) i o l (ma) - 20 - 100 10203040506070 4.35 4.40 4.45 4.50 4.55 4.60 4.65 ta ( c) v s (mv) v s vs. ta i o l vs. ta
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