ka75xxx voltage detector voltage detector to-92 the ka75250/270/290/310/33/36/39/42/45 prevents error of system from supply voltage below normal voltage level at the time the power on and instantaneous power off in systems. features detecting against error operations at the power on/off. resetting function for the low voltage microprocessor. 1.input 2.gnd 3.output checking low battery block diagram ordering information + - v ref ? v cc ? gnd out 1 2 3 device pkg operating temp. ka75250 ka75270 ka75290 ka75310 ka7533 ka7536 ka7539 KA7542 ka7545 to-92 -30~ + 75 ? ?1999 fairchild semiconductor corporation rev. b
ka75xxx voltage detector absolute maximum rating (t a = 25 ? ) electrical characteristics (t a = 25 ? ) characteristic symbol value unit supply voltage detecting voltage hysteresis voltage operating temperature storage temperature power dissipation detecting voltage temperature coefficient v cc v det v hys t opr t stg p d l v det / l t 0.3 ~ +15.0 2. 5/2.7/2.9/3.1 3. 3/3.6/3.9/4.2/4.5 50 - 30 ~ + 75 - 50 ~ + 150 200 r l = 200 ` , ? 0.01 v v mv ? ? mw / ? characteristic symbol test conditions min typ max unit detecting voltage v det r l = 200 ` ka75250 v ol ' 0.4v ka75270 ka75290 ka75310 ka7533 ka7536 ka7539 KA7542 ka7545 2.35 2.55 2.75 2.95 3.15 3.45 3.75 4.05 4.35 2. 5 2.7 2.9 3.1 3.3 3.6 3.9 4.2 4.5 2.65 2.85 3.05 3.25 3.45 3.75 4.05 4.35 4.65 v low output voltage v ol r l = 200 `?? 0.4 v output leakage current i lkg v cc = 15v ?? 0.1 s a hysteresis voltage v hys r l = 200 ` 30 50 100 mv detecting voltage temperature coefficient l v det / l t r l = 200 ` ? 0.01 / ? circuit current (at on time) i ccl v cc = v det(min) - 0.05v ? 300 500 s a circuit current (at off time) i cch v cc = 5.25v ? 30 50 s a threshold operating voltage v th(opr) r l = 200 ` , v ol ' 0.4v 0.6 0.8 1.0 v l transmission delay time t ol r l = 1.0k ` , c l = 100pf ? 10 ?s s h transmission delay time t oh r l = 1.0k ` , c l = 100pf ? 15 20 s s output current (at on time i) i oli v cc = v det(min) - 0.05v, t c = 25 ? 717 27ma output current (at on time ii) i olii v cc = v det(min) - 0.05v, t c = -30 ~ + 75 ? 816 30ma
ka75xxx voltage detector test circuit 1. test circuit 2. test circuit 3. + 2 v1 a2 3 m ka75xx a1 1 10u 10v rl 2 1 input pulse 0.3u/ 100v 3 ka75xx m + 5.0v 10u/ 100v rl 2 1 ka75xx rl v cc led 3
ka75xxx voltage detector application circuit 1 ka75xx v cc 3 v cc cpu gnd reset 2
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