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t echnical data 2011, january, ver.0 2 quad single supply comparator the il2901 consists of four independent precision voltage comparators with an offset voltage specific ation as low as 2.0 mv max for four comparators which were designed specifically to operate from a single power supply over a wide range of voltages. application areas include limit comparators, simple analog to digital converters; pulse, square wave and t ime delay generators; wide range vco; mos clock timers; multivibrators and high voltage digital logic gates. ? single or split supply operation ? low input bias current ? low input offset current ? input common mode voltage range to gnd ? low output saturation volta ge ? ttl and cmos compatible il2901 ordering information il2901 n plastic il2901 d soic t a = - 40 to 85 c for all packages . logic diagram pin 3 = v cc pin 12 = gnd pin assignment
il2901 2011, january, ver.0 2 maximum ratings * symbol parameter value unit v cc power supply voltages single supply split supplies 36 18 v v idr input dif ferential voltage range 36 v v icr input common mode voltage range (1) - 0.3 to v cc v i sc output short circuit to ground continuous i in input current, per pin (2) 50 ma t j junction temperature plastic packages 150 c tstg storage temperature - 65 to + 150 c t l lead temperature, 1mm from case for 10 seconds 260 c p d power dissipation @t a =25 c plastic package derate above 25 c 1.0 8.0 w mw/ c * stresses bey ond those listed under ?absolute maximum ratings? may cause permanent damage to the device. these are stress ratings only and functional operation of the device at these or any other conditions beyond those indicated under ?recommended operating conditio ns? is not implied. exposure to absolute - maximum - rated conditions for extended periods may affect device reliability. functional operation should be restricted to the recommended operating conditions. notes: 1. split power supplies. 2. v in < - 0.3v. this input current will only exist when voltage at any of the input leads is driven negative. recommended operating conditions symbol parameter min max unit v cc dc supply voltage 2.5 or 5.0 15 or 30 v t a operating temperature, all package types - 40 +85 c this device contains protection circuitry to guard against damage due to high static voltages or electric fields. however, precautions must be taken to avoid applications of any voltage higher than maximum rated voltages to this high - impedance circuit. for proper operation, v in and v out should be constrained to the range gnd (v in or v out ) v cc . unused inputs must always be tied to an appropriate logic volt age level (e.g., either gnd or v cc ). unused outputs must be left open.
il2901 2011, january, ver.0 2 dc electrical characteristics (t a = - 40 to +85 c) guaranteed limit symbol parameter test conditions min typ max unit v io input offset voltage v 0 =1.4v v cc =5.0 - 30v;r s 100? v icr =0v - (v cc - 1.5)v - 9.0 5.0* mv i ib input bias current v 0 =1.4v v cc =5.0 - 30v v icr =0v - (v cc - 1.5)v - 400 na i io input offset current v 0 =1.4v v cc =5.0 - 30v v icr =0v - (v cc - 1.5)v - 150 na v icr input common mode voltage range v cc =5.0 - 30v 0 v cc - 2.0v v i cc supply current r l = ,v cc =5.0 r l = ,v cc =30v - - 2.0* 2.5* ma a vol voltage gain v cc =15v, r l =15k ? - 200* - v/mv t 1 large signal response time v in =ttl logic swing, v ref =1.4v, v cc =5.0v, r l =5.1k ? , v rl =5.0v - 300* - ns t 2 response time v cc =5.0v, r l =5.1k ? , v rl =5 .0v - 1.3* - s i sink output sink current v i ( - )=1.0v, v i (+)=0v, v 0 1.5v, v cc =5.0v 6.0* - - ma v sat saturation voltage v i ( - )=1.0v, v i (+)=0v, i sink 4.0ma, v cc =5.0v - - 700 mv i ol output leakage current v i (+)=1.0v, v i ( - )=0v, v 0 =5.0v v 0 =30v 0.1* 1000 na v idr differential input voltage range all v in gnd or v - supply (if used) v cc * v *=@25 c
il2901 2011, january, ver.0 2 typical performance characteristics
il2901 2011, january, ver.0 2 application note the il2901 is high gain, wide bandwidth devices which, like most comparators, can easily oscillate if the output lead is inadvertently allowed to capacitively couple to the inputs via stray capacitance. this shows up only during the output voltage transition intervals as the comparator changes states. power supply bypassing is not required to solve thi s problem. standard pc board layout is helpful as it reduces stray input - output coupling. reducing these input resistors to < 10 k reduces the feedback signal levels and finally, adding even a small amount (1 to 10 mv) of positive feedback (hysteresis) causes such a rapid transition that oscillations due to stray feedback are not possible. simply socketing the ic and attaching resis tors to the pins will cause input - output oscillations during the small transition intervals unless hysteresis is used. if the input signal is a pulse waveform, with relatively fast rise and fall times, hysteresis is not required. all pins of any unused com pa rators should be tied to the negative supply. the bias network of the il2901 establishes a drain curr ent which is independent of the magnitude of the power supply voltage over the range of from 2 vdc to 30 vdc. it is usually unnecessary t o use a bypass capacitor across the power supply line. the differential input voltage may be larger than v+ without damaging the device. protection should be provided to prevent the input voltages from going negative more than ? 0.3 vdc (at 25c). an input clamp diode can be used as shown in the applications section. typical application s (v + = 5.0v dc )
il2901 2011, january, ver.0 2 typical application s (v + = 5.0v dc ) typical application s (v + = 1 5.0v dc )
il2901 2011, january, ver.0 2 typical app lication s (v + = 1 5.0v dc )
il2901 2011, january, ver.0 2 typical application s (v + = 1 5.0v dc )
il2901 2011, january, ver.0 2 typical application s (v + = 1 5.0v dc )
il2901 2011, january, ver.0 2 typical application s (v + = 1 5.0v dc )
il2901 2011, january, ver.0 2 split supply applications ( v + = 15.0v dc and v - = - 15.0v dc )
il2901 2011, january, ver.0 2

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