mitsumi system reset pst70xx system reset monolithic ic pst70xx series outline these low reset type ics function in a variety of cpu systems and other logic systems, to detect power supply voltage and reset the system accurately when power is turned on or interrupted. they are ideal for use in battery check circuits for products using batteries, as they have ultra-low current consumption and a high precision voltage detection function. features 1. high precision voltage detection vs2% max. 2. ultra-low current consumption i cch =2a typ. i ccl =3a typ. 3. low operating limit voltage 0.65v typ. 4. hysteresis voltage provided in detection voltage 50mv typ. 5. output current high for on 30ma typ. 6. detection voltage can be selected as desired within a range of 1.9v~4.6v in 0.1v steps, as indicated below. pst70xx detection voltage value (example: for 4.6v ....... pst7046) package mmp-3a (pst70 m) to-92a (pst70 ) applications 1. reset circuits in microcomputers, cpus and mpus. 2. logic circuit reset circuits. 3. battery voltage check circuits. 4. back-up power supply switching circuits. 5. level detection circuits. pin assignment 123 to - 92a 3 1 2 mmp-3a 1 v cc 2 gnd 3 v out 1 v cc 2 gnd 3 v out
mitsumi system reset pst70xx absolute maximum ratings (ta=25 c) electrical characteristics (ta=25 c) equivalent circuit diagram item symbol rating 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 conditions measurement circuit min. typ. max. units 4.6~ detection voltage v s r l =470 v cc =h l 1 v s typ. 1.9 v s typ. v - 2% (0.1v +2% step ) hysteresis voltage v s r l =470 1 30 50 100 mv detection voltage v s / t r l =470 1 0.01 %/ c temperature coefficient low-level output voltage v ol v cc =v s min. - 0.05v 1 0.2 0.4 v r l =470 output leakage current i oh v cc =10.0v 1 0.1 a circuit current while on i ccl v cc =v s min. - 0.05v 1 3.0 6.0 a r l = circuit current while off i cch v cc =v s typ. /0.85v 1 2.0 4.0 a r l = "h"transport delay time t plh r l =4.7k 7046~24 2 5 30 s c l =100p 7023~19 2 10 30 "l"transport delay time t phl r l =4.7k 7046~24 2 30 70 s c l =100p 7023~19 2 70 150 operation limit voltage v opl r l =4.7k v ol < = 0.4v 1 0.65 0.85 v output current while on 1 i ol 1 v cc =v s min. - 0.05v 1 8 30 ma r l =0 output current while on 2 i ol 2 ta= - 20 c~+75 c15 ma
mitsumi system reset pst70xx measuring circuit [1] [2] * 1 * 2 0v * 1 vs + 0.4v * 2 vs - 0.4v
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