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ap331a single differential comparator ap331a rev. 2 1 of 13 february 2009 www.diodes.com ? diodes incorporated ? wide supply voltage range: 2.0v to 36v single or dual supplies: 1.0v to 18v ? very low supply current drain (0.4ma) ? independent of supply voltage ? low input biasing current: 150na ? low input offset current: 70na ? low input offset voltage: 4mv ? input common-mode voltage range includes ground ? differential input voltage range equal to the power supply voltage ? low output saturation voltage: 250mv at 4ma ? output voltage compatible with ttl, dtl, ecl, mos and cmos logic systems ? sot25 and sot25r: available in ?green? molding compound (no br, sb) ? lead free finish/ rohs compliant (note 1) the ap331a is a precision voltage comparators with an offset voltage specification as low as 8.0 mv max for comparator which were designed specifically to operate from a single power supply over a wide range of voltages. operation from split power supplies is also possible and the low power supply current drain is independent of the magnitude of the power supply voltage. the comparator also have a unique characteristic in that the input common-mode voltage range includes ground, even though operated from a single power supply voltage. application areas include limit comparators, simple analog to digital converters; pulse, square wave and time delay generators; wide range vco; mos clock timers; multivibrators and high voltage digital logic gates. the ap331a is designed to directly interface with ttl and cmos. when operated from both plus and minus power supplies, the ap331a will directly interface with mos logic where their low power drain is a distinct advantage over standard comparators. ? high precision comparators ? reduced v os drift over temperature ? eliminates need for dual supplies ? allows sensing near ground ? compatible with all forms of logic ? power drain suitable for battery operation ordering information package packing lead free g : green 7 : tape & reel ap331a xx g - 7 w : sot25 wr : sot25r device package code packaging (note 2) 7? tape and reel quantity part number suffix ap331awg-7 w sot25 3000/tape & reel -7 AP331AWRG-7 wr sot25r 3000/tape & reel -7 notes: 1. eu directive 2002/95/ec (rohs). all applicable rohs exemptions applied. please visit our website at http://www.diodes.com/products/lead_free.html . 2. pad layout as shown on diodes inc. suggested pad layout document ap02001, which can be found on our website at http://www.diodes.com/datasheets/ap02001.pdf . features general description applications
ap331a single differential comparator ap331a rev. 2 2 of 13 february 2009 www.diodes.com ? diodes incorporated pin assignments (1) sot25 (2) sot25r in+ in- vcc ( top view ) 5 4 3 2 1 gnd output in- in+ vcc ( top view ) 5 4 3 2 1 gnd output pin descriptions pin name pin no. description sot25 sot25r in- 1 3 input- gnd 2 2 ground in+ 3 1 input+ output 4 4 output vcc 5 5 power supply block diagram v + 100 a 3.5 a 100a 3.5 a +input -input output q1 q2 q3 q4 q5 q6 q7 q8
ap331a single differential comparator ap331a rev. 2 3 of 13 february 2009 www.diodes.com ? diodes incorporated absolute maximum ratings symbol paramete r rating unit v cc supply voltage 40 v v in differential input voltage (note 10) 40 v v in input voltage -0.3 to +40 v i cc input current (v in -0.3v) (note 5) 50 ma p d power dissipation (note 3) sot25 740 mw sot25r output short-circuit to ground (note 4) continuous t j operatin g junction temperature ran g e+ 1 5 0 o c t st storage temperature range -65 to +150 o c recommended oper ating conditions symbol paramete r min max unit v cc supply voltage (single) +2 +36 v v cc supply voltage (dual supplies, v + vs gnd) 1 18 v v in differential input voltage (single) (note 10) 0 36 v v in differential input voltage (dual supplies) (note 10) -18 +18 v t a operating ambient temperature 0 70 o c electrical characteristics (v cc = 5v, t a = 25 o c, unless otherwise stated) symbol paramete r conditions min typ. max unit v offset input offset voltage (note 11) - 4.0 8.0 mv i bias input bias current i in (+) or i in (-) with output in linear range, v cm = 0v (note 7) - 150 400 na i offset input offset current i in ( + ) -i in ( - ) v cm = 0v - 70 150 na input common mode voltage range v + = 30v (note 8) 0 - v + -1.5 v i cc supply current r l = v + = 5v - 0.4 1 ma v + = 36v - 1 2.5 voltage gain r l > 15k ? , v + = 15v v o = 1v to 11v 50 200 - v/mv large signal response time v in = ttl logic swing, v ref = 1.4v, v rl = 5v, r l = 5.1k ? - 300 - ns response time v rl = 5v, r l = 5.1k ? (note 9) - 1.3 - s i o(sink) output sink current v in (-) = 1v, v in (+) = 0, v o < 1.5v 6.0 16 - ma v sat saturation voltage v in (-) = 1v, v in (+) = 0, i sink < 4ma - 250 400 mv i o(leak) output leakage current v in (-) = 0, v in (+) = 1v, v o = 5v - 0.1 - na
ap331a single differential comparator ap331a rev. 2 4 of 13 february 2009 www.diodes.com ? diodes incorporated electrical characteristics ( v cc = 5v ) ( note 6 ) symbol paramete r conditions min typ. max unit v offset input offset voltage (note 11) - - 9 mv i offset input offset current i in ( + ) -i in ( - ) , v cm = 0v - - 200 n a i bias input bias current i in (+) or i in (-) with output in linear range, v cm = 0v (note 7) - - 500 na input common mode voltage range v + =30v (note 8) 0 - v + -2.0 v v sat saturation voltage v in (-) = 1v, v in (+) = 0, i sink < 4ma - - 700 mv i o(leak) output leakage current v in (-) = 0, v in (+) = 1v, v o = 30v - - 1.0 a differential input voltage keep all v in ?s > 0v (or v - , if used), (note 10) - - 36 v ja thermal resistance junction-to-ambient sot25 (note 12) 173 o c/w sot25r (note 12) jc t hermal resistance junction-to-case sot25 (note 12) 37 o c/w sot25r (note 12) notes: 3. the maximum power dissipation is a function of t j(max) , ja . the maximum allowable power dissipation at any ambient temperature is p d = (t j(max) -t a )/ ja . all numbers apply for packages soldered directly onto a pc board. 4. short circuits from the output to v + can cause excessive heating and eventual destruction. when considering short circuits to ground, the maximum output current is approximately 20ma independent of the magnitude of v + . 5. this input current will only exist when the voltage at any of the input leads is driven negative. it is due to the collector-ba se junction of the input pnp transistors becoming forward biased and thereby acting as input diode clamps. in additio n to this diode action, there is also lateral npn parasitic transistor action on the ic chip. this transistor action can cau se the output voltages of the comparators to go to the v + voltage level (or to ground for a large overdrive) for the time duration that an input is driven negative. this is not destructive and normal output states will re-establish when the input voltage, which is nega tive, again returns to a value greater than -0.3v. 6. the ap331a temperature specifications are limited to 0c < t op < +70c. 7. the direction of the input current is out of the ic due to the pnp input stage. this current is essentially constant, independe nt of the state of the output so no loading change exists on the reference or input lines. 8. the input common-mode voltage or either input signal voltage should not be allowed to go negative by more than 0.3v. the upper end of the common-mode voltage range is v + -1.5v at 25c, but either or both inputs can go to 36v without damage, independent of the magnitude of v + . 9. the response time specified is for a 100mv input step with 5mv overdrive. for larger overdrive signals 300ns can be obtained, see typical performance characteristics section. 10. positive excursions of input voltage may exceed the power supply level. as long as the other voltage remains within the common-mode range, the comparator will provide a proper output state. the low input voltage state must not be less than -0.3v (or 0.3v below the magnitude of the negative power supply, if used). 11. at output switch point, v o ~ 1.4v, r s =0 ? with v + from 5v to 30v; and over the full input common-mode range (0v to v + -1.5v), at 25c. 12. test condition for sot25 and sot25r: device mounted on fr-4 substrate pc board, 2oz copper, with minimum recommend ed pad layout.
ap331a single differential comparator ap331a rev. 2 5 of 13 february 2009 www.diodes.com ? diodes incorporated application information the ap331a is high gain, wide bandwidth devices, like most comparators, can easily oscillate if the output lead is inadvertentl y allowed to capacitively couple to the inputs via stray capacitance. this shows up only during the output voltage transition int ervals as the comparator change states. power supply bypassing is not required to solve this problem. standard pc board layout is helpful as it reduces stray input-output coupling. reducing the input resistors to < 10k ? reduces the feedback signal levels and finally, adding even a small amount (1.0 to 10 mv) of positive feedback (hysteresis) causes such a rapid transition that oscillations due to stray fee dback are not possible. simply socketing the ic and attaching resistors 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, hystere sis is not required. all input pins of any unused comparators should be tied to the negative supply. the bias network of the ap331a establishes a drain current independent of the magnitude of the power supply voltage over the range of from 2.0 v dc to 30 v dc . it is usually unnecessary to use a bypass capacitor across the power supply line. the differential input voltage may be larger than v+ without damaging the device (note 10). protection should be provided to prevent the input voltages from going negative more than -0.3 v dc (at 25c). an input clamp diode can be used as shown in the applications section. the output of the ap331a is the uncommitted collector of a grounded-emitter npn output transistor. many collectors can be tied together to provide an output or?ing function. an output pull-up resistor can be connected to any available power supply voltag e within the permitted supply voltage range and there is no restriction on this voltage due to the magnitude of the voltage applied to t he v + terminal of the ap331a package. the output can also be used as a simple spst switch to ground (when a pull-up resistor is not used). the amount of current the output device can sink is limited by the drive available (which is independent of v + ) and the of this device. when the maximum current limit is reached (approximately 16ma), the output transistor will come out of saturation and the outpu t voltage will rise very rapidly. the output saturation voltage is limited by the approximately 60 ? r sat of the output transistor. the low offset voltage of the output transistor (1.0 mv) allows the output to clamp essentially to ground level for small load currents. typical circuit ( v cc = 5.0v dc ) v o 3.0k v + +v in +v ref + - + - +5.0v dc 100k 1/4 mm54cxx
ap331a single differential comparator ap331a rev. 2 6 of 13 february 2009 www.diodes.com ? diodes incorporated typical circuit (continued) (v cc = 5.0v dc ) crystal controlled oscillator + - v o 200k 0.1f 2.0k v + v + 100k 200k 0 crystal f=100khz ap331a + - + - + - +v c frequency control voltage input 0.1f 10 20k 20k 50k v + /2 output2 output1 500pf v + 0.01f 3.0k 5.1k 100k 3.0k v + two-decade high frequency vco v + /2 ap331a ap331a ap331a 100k non-inverting comparator with hysteresis v o 3k v + +v in +v ref + - 10m 10k ap331a
ap331a single differential comparator ap331a rev. 2 7 of 13 february 2009 www.diodes.com ? diodes incorporated typical circuit (continued) (v cc = 5.0v dc ) and gate f 3k v + a + - 1k b c 1k 100k 100k 100k 39k +0.375v 0 "0" "1" ap331a v + or gate 3k v + a + - 1k b c 1k 100k 100k 100k 200k +0.075v v + 0 "0" "1" f ap331a large fan-in and gate r4 3k v + a + - d1 b c 100k 10k v + 0 "0" "1" d d2 d3 d4 all diodes 1n914 100k v out ap331a limit comparator + - + - 2r s 2r s r s 10k v + (12v dc ) lamp 12 esb +v in +v ref low +v ref hi 2n2222 ap331a ap331a
ap331a single differential comparator ap331a rev. 2 8 of 13 february 2009 www.diodes.com ? diodes incorporated typical circuit (continued) (v cc = 5.0v dc ) oring the outputs + - + - 3.0k v o v + ap331a ap331a zero crossing detector (single power supply) 5.1k v + + - v o 100k 100k 5.1k 5.1k 1n914 v in 10k 20m ap331a one-shot multivibrator 10k v + + - v o 1n914 1m 1n914 100pf 0.001f 1m 1m + 0 t 0 pw t 0 t 1 0 v + 1ms ap331a
ap331a single differential comparator ap331a rev. 2 9 of 13 february 2009 www.diodes.com ? diodes incorporated typical circuit (continued) (v cc = 5.0v dc )
ap331a single differential comparator ap331a rev. 2 10 of 13 february 2009 www.diodes.com ? diodes incorporated split-supply applications (v + = +15v dc and v - = -15 v dc ) + - + - + - 2.4k 2.4k a b 2k 8.2k 3.9k 2k v + 10k 51k 51k 5.1k 50pf v - 6.8k mos clock driver ap331a ap331a ap331a ap331a
ap331a single differential comparator ap331a rev. 2 11 of 13 february 2009 www.diodes.com ? diodes incorporated typical characteristics supply current input current response time for various input overdrives?negative transition response time for various input overdrives?positive transition output saturation voltage
ap331a single differential comparator ap331a rev. 2 12 of 13 february 2009 www.diodes.com ? diodes incorporated marking information (1) sot25 and sot25r 1 2 3 5 7 4 xx y w x ( top view ) xx : identification code w : week : a~z : 1~26 week; x : a~z : green y : year 0~9 a~z : 27~52 week; z represents 52 and 53 week part number package identification code ap331a sot25 r9 ap331a sot25r r3 package information (all dimensions in mm) (1) package type: sot25 and sot25r
ap331a single differential comparator ap331a rev. 2 13 of 13 february 2009 www.diodes.com ? diodes incorporated important notice life support diodes incorporated and its subsidiaries reserve the right to make modifications, enhancements, improvements, corrections or ot her changes without further notice to any product herein. diodes incorporated does not assume any liability arising out of the application or use of any pr oduct described herein; neither does it convey any license under its patent rights, nor the rights of others. the user of products in such applications shall assume all risks of such use and will agree to hold diodes incorporated and all the companies whose products are represented on our website, harmless against all dam ages. diodes incorporated products are not authorized for use as critical components in life support devices or systems without the e xpressed written approval of the president of diodes incorporated.

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