etic reserves the right to make changes at any time to improve the design and to supply the best product. ?2000, rev a1 ic-haus gmbh tel +49-6135-9292-0 integrated circuits fax +49-6135-9292-192 am kuemmerling 18, d-55294 bodenheim http://www.ichaus.com page 1 of 2 features supply voltage range 4.5v to 30v designed for phototransistor inputs index channel gated by a and b current sink for led drive (see application note app-d 2 ) outputs short circuit protected 25ma peak drive current 3 channel differential amplifier-comparator (phototransistor input version of the standard et9570) ET9571 description these devices are specifically designed as receiver circuits for the phototransistor signals available in some optical encoders. connect the emitters of the phototransistors to the input pins, with the collectors connected to vcc. the inputs have 330 ohm resistors to terminate the phototransistors in an emitter follower mode. differential inputs enhance noise rejection and performance over temperature. care should be taken to use phototransistors on differential input pairs which have similar values of dc leakage current, as large differences in this charactersitic will affect waveform symmetry. applications optical encoders industrial controls absolute maximum ratings parameter symbol min. max. units ref. operating temperature range t a -40 125 c note 1 supply voltage range v cc 4.5 30 v
etic reserves the right to make changes at any time to improve the design and to supply the best product. ?2000, rev a1 ic-haus gmbh tel +49-6135-9292-0 integrated circuits fax +49-6135-9292-192 am kuemmerling 18, d-55294 bodenheim http://www.ichaus.com page 2 of 2 electrical characteristics unless otherwise specified, typical values given at v cc =12v, t a = 25c, with led and rset open. parameters symbol min. typ. max. units test conditions high level supply current i cch 1 i cch 2 4.0 4.5 6.7 7.5 11.0 12.0 ma vcc = 4.5 v vcc = 30.0v peak photocurrent input i ip 0.3 0.5 15 ma note 2 dark cell level i id 0.0 0.05 7.5 ma photocurrent contrast ratio i r 2:1 - - peak:dark cell hysteresis at comparator inputs i h 61120mv output high level voltage v oh 2.5 28.0 3.0 28.5 vi oh = -4ma,v cc = 4.5v i oh = -4ma,v cc = 30v output low level voltage v ol 199 400 mv v cc = 4.5v-30v i ol = 8ma output short-circuit current driving high (all outputs) i os 15 25 50 ma v cc = 5v, v out = 0v output short-circuit current driving low (all outputs) i os 30 70 120 ma v cc = 5v, v out = 5v rset voltage v rset 1.3 1.7 2.1 v r = 180 ohms ac switching characteristics values given at v cc = 5v, t a = 25c, c l = 15pf on all outputs. parameters symbol min. typ. max . units test conditions propagation delay from comparator input to output t pd 850 ns output rise time t r 100 ns output fall time t f 20 ns notes: 1. this is not a test parameter, but for information only. 2. higher signal levels can be handled by adding resistors from the inputs to ground. package suffix chip only -c 16 lead soic -sop
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