preliminary *this is tentative specification. RT8H042C 110428 description RT8H042C is composed by npn transistors, pnp transistors and resistors. this product has the reset function, and controls the backup function of the memory of sram and the microcomputer (internal organs ram) the reset signalres DDD is output to the microcomputer when the down of power and the power supply are abnormal. at the same time, ram is switched from the main power supply to the backup power supply, the signal cs DDD that becomes a stand-by state is output, and ram is switched to the backup circuit. features miniaturization of a set. detecting voltagepower supply watch voltage standard1.23v chip selection signal outputc s DDD reset outputres DDD application ? backup of memories of 3v faction microcomputer systems such as electronic office equipment, industrial equipment, and ho me electrical appliances ?control system of power supply where switch of external source and battery like sram board with built-in backup function is needed block diagram outline drawing unitmm 2 0 4 2 3 6 5 4 pin layout cs DDD ct r vin gnd res DDD ??? W? ?`` - + vin r res gnd cs ct reset circuit delay circuit comparator 0 0.1 0.81 2.8 0.1 1.50 0.1 0.95 0.05 2.80 0.2 0.65 0.2 0.65 0.2 1.9 0.1 0.33 0.05 1.1 0.1 1.2 0.01
preliminary *this is tentative specification. RT8H042C 110428 absolute maximum ratings (ta25) symbol parameter test co nditions ratings unit vin operating supply voltage range 12 v pd internal power dissipation taR25 200 mw k thermal derating 1.6 mw/ tj junction temperature 150 tstg storage temperature (keep dry) 40150 topr operating temperature (keep dry) 2075 electrical characteristic (ta=25,vcc=3v unless otherwise noted .) designed value symbol parameter test conditions min typ max unit vin operating supply voltage range - 10 v res DDD -vin10k? iin circuit current cs DD 10,3vpullupr0v - 700 1050 ua rh?l r e s DDD -vin10k? vrth r threshold voltage cs DD 10,3vpullup,ctopen 1.18 1.23 1.28 v rh?l ,r e s DDD -vin10k? vrth hysteresis cs DD 10,3vpullup 50 104 200 mv r:2v,r e s DDD -vin10k? cth output voltage >& terminal ct in level hi >' cs DD 10,3vpullup 0.65 1.32 2 v r1v, r e s DDD -vin10k? ctl output voltage >& terminal ct in level low >' cs DD 10,3vpullup - - 0.3 v r2v, r e s DDD -vin10k? rresl output voltage >& res DDD in level low >' cs DD 10,3vpullup - - vin v res DDD 1masink) rresh output voltage >& res DDD in level hi >' r1v,c10,3vpullup - - 0.5 v r1v,r e s DDD -vin10k? csh output voltage >& cs DD in level hi >' cs DD 10,3vpullup - - vin v cs DD 1masink) csl output voltage >& cs DD in level low >' r2v,r e s DDD -vin10k? - - 0.5 v rl?h ,r e s DDD -vin10k? tpd delay time cs DD 10,3vpullup,ct0.047uf 9.0 18.0 27.0 ms res DDD -vin10k? csleak cs DD leak current >& vin in level low >' rlowv) cs DD 10,3vpullup - - 0.5 ua delay time 3.83 x 10 5 x ct
preliminary *this is tentative specification. RT8H042C 110428 application circuit examples battery3v protective resistor recommended parts isaac1
6 - 41 tsukuba, isahaya, nagasaki, 854 - 0065 japan keep safety first in your circuit designs! isahaya electronics corporation puts the maximum effort into making semiconductor products better and more reliable, but there is always the possibility th at trouble may occur with them. trouble with semiconductors may lead to personal injury, fire or property damage. remember to give due consideration to safety when making your circuit designs, with appropri ate measures such as ( 1) placement of substitutive, auxiliary, ( 2) use of non - farmable material or ( 3) prevention against any malfunct ion or mishap. notes regarding these materials these materials are intended as a reference to our customers in the selection of the isah aya products best suited to the customer?s application; they don't convey any license under any intellectual prop erty rights, or any other rights, belonging isahaya or third party. isahaya electronics corporation assumes no responsibility for any damage, or infringement of any third party's rights , originating in the use of any product data, diagram s, charts or circuit application examples contained in these materials . all information contained in these materials, including product data, diagrams and charts, represent information on products at the time of publication of these materials, a nd are subject to change by isahaya electronics corporation without notice due to product improvements or other reasons. it is therefore recommended that customers contact isahaya electronics corporation or an authorized isahaya products distr ibutor for the latest product information before purchasing product listed herein. isahaya electronics corporation products are not designed or manufactured for use in a device or system that is used under circumstances in which human lif e is potentially at stake. please contact isahaya electronics corporation or an authorized isahaya products distributor when considering the use of a product contained herein for any specific purposes , such as apparatus or systems for transpor tation, vehicular, medical, aerospace, nuclear, or undersea repeater use. the prior written approval of isahaya electronics corporation is necessary to reprint or reproduce in whole or in part these materials. if these products or technolo gies are subject to the japanese export control restrictions, they must be exported under a license from the japanese government and cannot be imported into a country other than the approved destination. any diversion or re - export contrary to t he export control laws and regulations of japan and/or the country of destination is prohibited. please contact isahaya electronics corporation or authorized isahaya products distributor for further details on these materials or the product s contained therein. apr.2011
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