advanced monolithic systems, inc. www.advanced-monolithic.com phone (925) 443-0722 fax (925) 443-0723 advanced ams26 monolithic voltage detector systems features applications ? very low supply current ? cpu and logic circuit reset ? wide operating voltage range ? portable and battery powered equipment ? 2% precision voltage detection ? memory battery back-up circuit ? v-detect 1.45v to 4.6v in 0.05v increments ? window comparator ? v-detect 4.6v to 7.95v in 0.1v increments ? cellular phones ? 2.5% typical hysteresis ? pagers general description the ams26 series are voltage de tector ics featuring a high accu racy detector threshold of 2.0% and ultra-low supply current. internal circuit contains a precision voltage reference, a comparator, resistor network, and an output driver. the ams26 has an npn open collector output. the detector threshold is set from 1.45v to 4.6v in 0.05v increments and 4.6v to 7.9 in 0.1v increments. also available from 7.9v to 12v in 170mv increments, thus making it easy to use in a variety of supervisory applications including microprocessor reset circuits, memory batte ry back-up circuit, battery ch ecker, power failure detector and portable and battery powered electronics. ams26 is available in to-92 and the sub-mi niature 3-pin sot-23 surface mount package. ordering information output package type operating type to-92 3 lead sot-23 temperature range open drain ams26n-xa AMS26M-XA -30 to +80 c x= detector threshold setting. pin connections to-92 3l sot-23 plastic package (n) (m) 1 2 3 v out v in gnd v out gnd vin bottom view top view
advanced monolithic systems, inc. www.advanced-monolithic.com phone (925) 443-0722 fax (925) 443-0723 ams26 absolute maximum ratings (note 1) supply voltage 16v power dissi pation : to-92 package 300mw output voltage gnd - 0.3v tov in +0.3v sot-23 package 150mw output current 20ma storage temperature -40 c to +125 c operating temperature range -30 c to +80 c lead temperature (soldering 10 sec) 230 c electrical characteristics electrical characteristics at t a =25c, unless otherwise noted. parameter conditions (note 2) min. ams26-x typ. max. units detector threshold (v det ) -2.0 +2.0 % detector threshold hysteresis (v det ) * 2% (v det ) * 5% v supply current v in = 2.0v 1.0 3.0 a v in = 3.0v 1.3 3.4 v in = 4.0v 1.6 3.8 v in = 5.0v 2.0 4.2 operating voltage 1.50 10.00 v out p ut curren t v in = 2.0v 1.5 7.7 ma v in = 3.0v 3.0 10.1 v in = 4.0v 4.0 11.5 v in = 5.0v 5.0 13.0 output delay time 1 s detector threshold temperature coefficient -30 c t a +80 c 100 ppm/ c note 1: absolute maximum ratings are limits beyond which damage to the device may occur. for guaranteed performance limits and associat ed test conditions, see the electrical characteristics tables. block diagram v ref 3 + - vin vout gnd 1 2
advanced monolithic systems, inc. www.advanced-monolithic.com phone (925) 443-0722 fax (925) 443-0723 ams26 time chart output delay time test circuits detector threshold test circuit output current test circuit ams26 series v det v in gnd out r gnd v in gnd 100k ? ams26 series +v det v in gnd out i ou t gnd v in gnd output delay time t phl is defined as the time period from time a through time b, when the time at which a pulse voltage that increases from 1.2v to +v det +2.0v is applied to v in is time a, and the time at which the output reaches 3.5v under the conditions that the output pin (out) is pulled up to 7v by a resistor of 100k ? is time b. supply voltage (v in ) output voltage (out) gnd gnd 3.5v 7.0v 1.2v +v det +2.0v t phl t phl a b
advanced monolithic systems, inc. www.advanced-monolithic.com phone (925) 443-0722 fax (925) 443-0723 ams26 typical applications cpu reset circuit input voltage to ams26 is the same as the input voltage to cpu. input voltage to ams26 is differe nt from the input voltage to c pu. output delay time circuit voltage level indicator circuit (lighted when the power runs out) detector threshold changing circuit window comparator circuit ams26 series reset gnd cpu v in v in v in gnd out r 100 ? ams26 series reset gnd cpu v in v in2 v in gnd out r 100 ? v in1 ams26 series reset gnd cpu v in v in v in gnd out r 100 ? ams26 series gnd out v in v in ams26 series v in v in gnd out r1 r2 c changed detector threshold ) (-v r2 r2 r1 det + = hysteresis voltage ) (-v r2 r2 r1 hys + = when the value of r1 becomes excessi vely large, the detector threshold detected may differ from the valu e calculated using above formula. ams26 series v in gnd out ams26 series v in gnd out 100 ? v det1 v det2 out v in v in gnd out gnd v det 1 v det 2
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