technical data BT75AXX voltage detector functions bt 75x x ou t v ss v cc out 1 2 3 v ss v cc sot-23 to-92 sot-89 vss vcc out ? detecting against error operations at the power on/off ? resetting function for low voltage microprocessor ? checking low battery ? active low ? cmos or open drain output (mask option) ? tolerance 2% features ? low power consumption ? low temperature coefficient ? built-in voltage reference ? comparator hysteresis ? to-92, sot-23 packages are available general description the BT75AXX series are the voltage detectors, consist of a high-precision voltage reference, a comparator with precise thresholds and built-in hysteresis and an output driver. absolute maximum ratings (t a = 25 o c) characteristic symbol value unit supply voltage v cc -0.3 ~ +8.0 v operating temperature t opr -10 ~ +70 o c storage temperature t stg -40 ~ +125 o c output current i o 30 ma 1
BT75AXX electrical characteristics (t a = 25 o c, unless otherwise specified) characteristic symbol test conditions min typ max unit supply voltage v cc 1.2 5.5 v detecting voltage v det 2.16 2.35 2.50 2.65 2.74 3.23 3.82 4.12 4.61 4.90 2.20 2.40 2.55 2.70 2.80 3.30 3.90 4.20 4.70 5.00 2.24 2.45 2.60 2.75 2.86 3.37 3.98 4.28 4.79 5.10 v supply current i cc v cc = 5.0v, no load 8 15 a low output voltage v ol v cc = v det ?0.2v, i ol = 0.1ma 0.1 0.3 v high output voltage v oh v cc = v det +0.2v, i oh = 0.1ma v cc ? 0.3v v hysteresis voltage v hys 2.0 % detective voltage temperature coefficient det det vt v ? -10 o c < t a <70 o c 0.02 %/ o c block diagram cmos output open drain output 2 + - out v ref r a r b v b r c v ss v cc + - out v ss v cc v ref r a r b v b r c functional description the BT75AXX series is the set of voltage detector s equipped with a high stability voltage reference which is connected to the negative input of a comparator - denoted as v ref in block diagram. when the voltage drop to the positive input of the comparator (v b ) is high than v b ref , v out goes high. if v cc is decreased so that v b falls to a value less than v b ref , the comparator output inverts from high to low, v out goes low. the device has hysteresis to preven t the circuit from oscillation when v b v b ref . if v cc falls below the minimum operating vo ltage, the output becomes undefined. the detectable voltage is defined as: () ref v rcrb rcrbra det v + ++ =? the release voltage is defined as: () ref v rb rbra det v + =+ the hysteresis width is: )( det v) det hys v (v ?? = +
BT75AXX electrical characteristics 1. output voltage vs. supply voltage 2. output low current vs. supply voltage bt75a25 b t75a25 3 01 2 3 0 1 2 3 supply voltage: v (v) cc output v oltage: v ( v ) out ta=25 c o 0 0.5 1.0 1.5 2.0 2.5 3.0 0 2 4 6 8 1 0 supply voltage: v (v) cc output c urrent: i ( m a ) out ta=25 c o v =0.5v out 3. normalized v ol vs. temperature normalized v oh vs. temperature -50 0 +50 +100 0.94 0.96 0.98 1 1.02 1.04 1.06 temperature, t ( c) a o o utput v oltage, v ( v ) oh v =3.5v, i =2.5ma cc oh v =2.5v, i =1.5ma cc oh v =5v, i =3.5ma cc oh -50 0 +50 +100 0.6 0.8 1 1.2 1.4 1.6 temperature, t ( c) a o output v oltage, v ( v ) ol 4. v ol vs. output current v cc - v oh vs. output current 0 2 4 6 8 0 100 200 300 400 500 output current, i (ma) ol output v oltage, v ( v ) ol v=5v cc v =2.5v cc v =1.6v cc 0 2 4 6 8 0 100 200 300 400 500 600 700 800 output current, i (ma) oh v - v ( v ) cc oh v=5v cc v =3.5v cc
BT75AXX 5. v ol vs. supply voltage v cc - v oh vs. supply voltage 4 1.5 2.5 3.5 4.5 supply voltage, v (v) cc output voltage, v (v) ol 0 100 200 300 400 500 1.5 22.5 3 4 3.5 4.5 5 0 100 200 300 400 500 i=1ma oh i=500a oh i=2ma oh i=4ma oh supply voltage, v (v) cc v - v ( v ) cc oh i=4ma ol i=2ma ol i=1ma ol i=500a ol 6. supply current vs. temperature normalized threshol d vs. temperature -50 0 +50 +100 0.98 0.985 0.99 0.995 1.000 1.005 1.010 1.015 1.02 temperature, t ( c) a o threshold {1} -50 0 +50 +100 0 10 20 30 temperature, t ( c) a o supply c urrent, i ( a ) cc m v=5v cc v=2.0v cc ordering information bt75a xx xx 22 -> 2.20v 24 -> 2.40v 25 -> 2.55v . . 42 -> 4.20v 47 -> 4.70v ls = to-92 straight (bulk) lf = to-92 form (taping) st = sot-23 (taping) pt = sot-23 (taping) 50 -> 5.00v
BT75AXX package dimensions to-92 5
BT75AXX 6
BT75AXX 7
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