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for pricing, delivery, and ordering information, please contact maxim/dallas direct! at 1-888-629-4642, or visit maxim? website at www.maxim-ic.com. ________________general description the max987/max988/max991/max992/max995/ max996 single/dual/quad micropower comparators feature low-voltage operation and rail-to-rail inputs and outputs. their operating voltage ranges from +2.5v to +5.5v, making them ideal for both 3v and 5v systems. these comparators also operate with ?.25v to ?.75v dual supplies. they consume only 48? per compara- tor while achieving a 120ns propagation delay. input bias current is typically 1.0pa, and input offset volt- age is typically 0.5mv. internal hysteresis ensures clean output switching, even with slow-moving input signals. the output stage? unique design limits supply-current surges while switching, virtually eliminating the supply glitches typical of many other comparators. the max987/max991/max995 have a push-pull output stage that sinks as well as sources current. large inter- nal output drivers allow rail-to-rail output swing with loads up to 8ma. the max988/max992/max996 have an open-drain output stage that can be pulled beyond v cc to 6v (max) above v ee . these open-drain versions are ideal for level translators and bipolar to single- ended converters. the single max987/max988 are available in tiny 5-pin sc70 packages, while the dual max991/max992 are available in ultra-small 8-pin sot23 and ?ax pack- ages. ____________________________features ? 120ns propagation delay ? 48 a quiescent supply current ? +2.5v to +5.5v single-supply operation ? common-mode input voltage range extends 250mv beyond the rails ? push-pull output stage sinks and sources 8ma current (max987/max991/max995) ? open-drain output voltage extends beyond v cc (max988/max992/max996) ? unique output stage reduces output switching current, minimizing overall power consumption ? 100 a supply current at 1mhz switching frequency ? no phase reversal for overdriven inputs ? available in space-saving packages: 5-pin sot23 (max987/max988) 8-pin max (max991/max992) max987/max988/max991/max992/max995/max996 high-speed, micropower, low-voltage, sot23, rail-to-rail i/o comparators ________________________________________________________________ maxim integrated products 1 v cc in- in+ 1 5 v ee out max987 max988 sot23/sc70 top view 2 3 4 pin configurations 19-1266; rev 2; 1/07 _______________ordering information ordering information continued at end of data sheet. typical application circuit appears at end of data sheet. pin configurations continued at end of data sheet. portable/battery- powered systems mobile communications zero-crossing detectors window comparators level translators threshold detectors/ discriminators ground/supply sensing ir receivers digital line receivers selector guide applications part pin-package pkg code top mark max987 exk-t 5 sc70-5 x5-1 abm max987euk-t 5 sot23-5 u5-1 abzb max987esa 8 so s8-2 part comparators per package output stage max987 1 push-pull max988 1 open-drain max991 2 push-pull max992 2 open-drain max995 4 push-pull max996 4 open-drain ?ax is a registered trademark of maxim integrated products, inc. note: all devices specified over the -40 c to +85 c operating temperature range.
max987/max988/max991/max992/max995/max996 high-speed, micropower, low-voltage, sot23, rail-to-rail i/o comparators 2 _______________________________________________________________________________________ absolute maximum ratings electrical characteristics (note 1) (v cc = +2.7v to +5.5v, v ee = 0v, v cm = 0v, t a = -40? to +85?, unless otherwise noted. typical values are at t a = +25?.) stresses beyond those listed under ?bsolute maximum ratings?may cause permanent damage to the device. these are stress rating s only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specificatio ns is not implied. exposure to absolute maximum rating conditions for extended periods may affect device reliability. supply voltage (v cc to v ee ) ...................................................6v in_-, in_+ to v ee .......................................-0.3v to (v cc + 0.3v) current into input pins .....................................................?0ma out_ to v ee max987/max991/max995 ....................-0.3v to (v cc + 0.3v) max988/max992/max996 ..................................-0.3v to +6v out_ short-circuit duration to v ee or v cc ...........................10s continuous power dissipation (t a = +70?) 5-pin sc70 (derate 3.1mw/? above +70?) ...............247mw 5-pin sot23 (derate 7.10mw/? above +70?)...........571mw 8-pin sot23 (derate 9.1mw/? above +70?).............727mw 8-pin so (derate 5.88mw/? above +70?).................471mw 8-pin ?ax (derate 4.5mw/? above +70?) ..............362mw 14-pin tssop (derate 9.1mw/? above +70?) ..........727mw 14-pin so (derate 8.33mw/? above +70?)...............667mw operating temperature range ...........................-40? to +85? storage temperature range .............................-65? to +150? lead temperature (soldering, 10s) .................................+300? inferred from psrr test conditions v 2.5 5.5 v cc supply voltage units min typ max symbol parameter 53 80 2.5v v cc 5.5v db 55 80 psrr power-supply rejection ratio v cc = 5v 96 mv ?.5 ? t a = +25? v ee -v cc + 0.25 0.25 ?.5 v hyst input hysteresis full common-mode range na i b input bias current (note 4) 0.001 10 pf 1.0 c in input capacitance db 50 80 cmrr common-mode rejection ratio pa 0.5 i os input offset current ? v os input offset voltage (note 3) v out = high ? 1.0 i leak output leakage current (max988/max992/ max996 only) 35 95 t a = +25? t a = -40? to +85? 48 80 v cc = 2.7v ? 96 i cc supply current per comparator t a = +25? t a = -40? to +85? sourcing or sinking, v out = v ee or v cc i sc output short-circuit current t a = +25? t a = -40? to +85? t a = -40? to +85? v ee v cc v v cmr common-mode voltage range (note 2) mv v cc = 5v v cc = 2.7v ma v cc = 5v, i sink = 8ma 0.55 0.2 0.4 v ol out output-voltage low v cc = 2.7v, i sink = 3.5ma v 0.4 0.15 0.3 t a = +25? t a = -40? to +85? t a = +25? t a = -40? to +85? t a = +25? v cc = 5v, i source = 8ma t a = -40? to +85? 4.45 4.6 4.85 v oh t a = +25? out output-voltage high (max987/max991/ max995 only) v cc = 2.7v, i source = 3.5ma t a = -40? to +85? v 2.3 2.4 2.55
max987/max988/max991/max992/max995/max996 high-speed, micropower, low-voltage, sot23, rail-to-rail i/o comparators _______________________________________________________________________________________ 3 electrical characteristics (continued) (v cc = +2.7v to +5.5v, v ee = 0v, v cm = 0v, t a = -40? to +85?, unless otherwise noted. typical values are at t a = +25?.) conditions units min typ max symbol parameter v cc = 5.0v ns 40 t rise out rise time (max987/max991/ max995 only) 20 15 ? 25 t pu power-up time ns v cc = 5.0v 40 t fall out fall time 20 15 120 210 100mv overdrive 100mv overdrive c l = 15pf, v cc = 5v 120 t pd+ propagation delay 210 ns 210 t pd- 120 max987/max991/ max995 only 10mv overdrive 100mv overdrive max987/max991/max995 only, c l = 15pf, v cc = 5v 10mv overdrive 10mv overdrive c l = 15pf c l = 50pf c l = 200pf c l = 15pf c l = 50pf c l = 200pf max988/max992/ max996 only, r pullup = 5.1k ? note 1: all device specifications are 100% production tested at t a = +25?. limits over the extended temperature range are guar- anteed by design, not production tested. note 2: inferred from the v os test. either or both inputs can be driven 0.3v beyond either supply rail without output phase reversal. note 3: v os is defined as the center of the hysteresis band at the input. note 4: i b is defined as the average of the two input bias currents (i b- , i b+ ).
typical operating characteristics (v cc = +5v, v cm = 0v, t a = +25?, unless otherwise noted.) 30 40 50 60 70 80 90 -60 -20 -40 0 20 40 60 80 100 supply current per comparator vs. temperature max9879 toc1 temperature (?) supply current ( a) v cc = 5.5.v v cc = 2.5.v v in+ > v in- 1000 10 0.01 0.1 1 10 100 1000 10,000 supply current per comparator vs. output transition frequency max987 toc2 output transition frequency (khz) supply current ( a) 100 v cc = 2.5v v cc = 5.5v max987/max988/max991/max992/max995/max996 high-speed, micropower, low-voltage, sot23, rail-to-rail i/o comparators 4 _______________________________________________________________________________________ 10,000 1 0.01 0.1 1 10 100 output low voltage vs. output sink current max987-03a output sink current (ma) output low voltage (mv) (v ol ) 10 100 1000 v in+ < v in- v cc = 2.7v v cc = 5.0v 120 0 -60 100 output short-circuit current vs. temperature 20 10 90 80 110 100 max987 05 temperature (?) output sink current (ma) -40-200 20406080 70 60 50 40 30 v cc = 5.0v v cc = 2.7v 1.1 -0.3 -60 100 input offset voltage vs. temperature -0.1 0.7 0.9 max987 06 temperature (?) offset voltage (mv) -40 -20 0 20 40 60 80 0.5 0.3 0.1 10,000 0.1 0.01 0.1 110100 output high voltage vs. output source current 1 max987-04 output source current (ma) output high voltage (mv) (v cc - v oh ) 10 100 1000 v in+ > v in- v cc = 5.0v v cc = 2.7v
max987/max988/max991/max992/max995/max996 high-speed, micropower, low-voltage, sot23, rail-to-rail i/o comparators _______________________________________________________________________________________ 5 100 110 130 150 170 190 120 140 160 180 200 -60 -20 -40 0 20 40 60 80 100 propagation delay vs. temperature max987 toc9 temperature (?) propagation delay (ns) v cc = 5.5.v v cc = 2.5.v v od = 50mv 1000 10,000 100 0.01 0.1 10 1 100 1000 propagation delay vs. capacitive load max987 toc8 capacitive load (nf) propagation delay (ns) v od = 50mv 300 0 0 60 120 20 80 40 100 140 propagation delay vs. input overdrive 100 50 250 200 150 max987 toc10 input overdrive (mv) propagation delay (ns) v cc = 2.5v v cc = 5.5v propagation delay (t pd- ) in+ out max987-12 100ns/div 50mv/div 2v/div v od = 50mv max987/max991/max995 propagation delay (t pd+ ) in+ out max987-11 100ns/div 50mv/div 2v/div v od = 50mv max987/max991/max995 switching current, out rising in+ out i cc max987-13 200ns/div 50mv/div 2v/div 2ma/div v od = 50mv typical operating characteristics (continued) (v cc = +5v, v cm = 0v, t a = +25?, unless otherwise noted.)
max987/max988/max991/max992/max995/max996 high-speed, micropower, low-voltage, sot23, rail-to-rail i/o comparators 6 _______________________________________________________________________________________ power-up delay v cc out max987-16 5 s/div 2v/div 2v/div v in- = 50mv v in+ = 0v switching current, out falling in+ out i cc max987-14 200ns/div 50mv/div 2v/div 2ma/div v od = 50mv 1mhz response in+ out max987-15 200ns/div 50mv/div 2v/div v od = 50mv typical operating characteristics (continued) (v cc = +5v, v cm = 0v, t a = +25?, unless otherwise noted.)
max987/max988/max991/max992/max995/max996 high-speed, micropower, low-voltage, sot23, rail-to-rail i/o comparators _______________________________________________________________________________________ 7 ______________________________________________________________pin description n.c. 1, 5, 8 no connection. not internally connected. ind- outd ind+ inc+ 13 14 12 10 outc inc- outb ina- inb+ inb- ina+ outa v cc in- v ee in+ out comparator d inverting input 8 9 7 2 5 6 3 1 4 11 comparator d output 7 2 5 6 3 1 8 4 comparator d noninverting input comparator c output comparator c inverting input comparator b output comparator c noninverting input comparator a inverting input comparator b noninverting input comparator b inverting input comparator a noninverting input comparator a output 2 7 positive supply voltage 4 2 comparator inverting input 5 4 negative supply voltage 3 3 comparator noninverting input 1 6 comparator output so/ tssop max995 max996 max991 max996 so/max/ sot23 max987 max988 sot23/ sc70 so pin name function
detailed description the max987/max988/max991/max992/max995/ max996 are single/dual/quad low-power, low-voltage comparators. they have an operating supply voltage range between +2.5v and +5.5v and consume only 48? per comparator, while achieving 120ns propaga- tion delay. their common-mode input voltage range extends 0.25v beyond each rail. internal hysteresis ensures clean output switching, even with slow-moving input signals. large internal output drivers allow rail-to- rail output swing with up to 8ma loads. the output stage employs a unique design that mini- mizes supply-current surges while switching, virtually eliminating the supply glitches typical of many other comparators. the max987/max991/max995 have a push-pull output structure that sinks as well as sources current. the max988/max992/max996 have an open- drain output stage that can be pulled beyond v cc to an absolute maximum of 6v above v ee . input stage circuitry the devices?input common-mode range extends from -0.25v to (v cc + 0.25v). these comparators may oper- ate at any differential input voltage within these limits. input bias current is typically 1.0pa if the input voltage is between the supply rails. comparator inputs are pro- tected from overvoltage by internal body diodes con- nected to the supply rails. as the input voltage exceeds the supply rails, these body diodes become forward biased and begin to conduct. consequently, bias cur- rents increase exponentially as the input voltage exceeds the supply rails. output stage circuitry these comparators contain a unique output stage capable of rail-to-rail operation with up to 8ma loads. many comparators consume orders of magnitude more current during switching than during steady-state oper- ation. however, with this family of comparators, the supply-current change during an output transition is extremely small. the typical operating characteristics supply current vs. output transition frequency graph shows the minimal supply-current increase as the out- put switching frequency approaches 1mhz. this char- acteristic eliminates the need for power-supply filter capacitors to reduce glitches created by comparator switching currents. battery life increases substantially in high-speed, battery-powered applications. applications information additional hysteresis max987/max991/max995 the max987/max991/max995 have ?.5mv internal hysteresis. additional hysteresis can be generated with three resistors using positive feedback (figure 1). unfortunately, this method also slows hysteresis response time. use the following procedure to calcu- late resistor values for the max987/max991/max995. 1) select r3. leakage current at in is under 10na; therefore, the current through r3 should be at least 1? to minimize errors caused by leakage current. the current through r3 at the trip point is (v ref - v out ) / r3. considering the two possible output states and solving for r3 yields two formulas: r3 = v ref / 1? or r3 = (v ref - v cc ) / 1?. use the smaller of the two resulting resistor values. for example, if v ref = 1.2v and v cc = 5v, then the two r3 resistor values are 1.2m ? and 3.8m ? . choose a 1.2m ? standard value for r3. 2) choose the hysteresis band required (v hb ). for this example, choose 50mv. 3) calculate r1 according to the following equation: r1 = r3 x (v hb / v cc ) for this example, insert the values r1 = 1.2m ? x (50mv / 5v) = 12k ? . 4) choose the trip point for v in rising (v thr ; v thf is the trip point for v in falling). this is the threshold voltage at which the comparator switches its output from low to high as v in rises above the trip point. for this example, choose 3v. max987/max988/max991/max992/max995/max996 high-speed, micropower, low-voltage, sot23, rail-to-rail i/o comparators v cc max987 max991 max995 out 0.1 f r3 r1 r2 v ref v ee v in v cc figure 1. additional hysteresis (max987/max991/max995) 8 _______________________________________________________________________________________
max987/max988/max991/max992/max995/max996 high-speed, micropower, low-voltage, sot23, rail-to-rail i/o comparators _______________________________________________________________________________________ 9 5) calculate r2 as shown. for this example, choose an 8.2k ? standard value: 6) verify trip voltages and hysteresis as follows: max988/max992/max996 the max988/max992/max996 have ?.5mv internal hysteresis. they have open-drain outputs and require an external pullup resistor (figure 2). additional hys- teresis can be generated using positive feedback, but the formulas differ slightly from those of the max987/max991/max995. use the following procedure to calculate resistor values: 1) select r3 according to the formulas r3 = v ref / 1? or r3 = (v ref - v cc ) / 1? - r4. use the smaller of the two resulting resistor values. 2) choose the hysteresis band required (v hb ). for this example, choose 50mv. 3) calculate r1 according to the following equation: r1 = (r3 + r4) x (v hb / v cc ) 4) choose the trip point for v in rising (v thr ; v thf is the trip point for v in falling). this is the threshold voltage at which the comparator switches its output from low to high as v in rises above the trip point. 5) calculate r2 as follows: 6) verify trip voltages and hysteresis as follows: circuit layout and bypassing these comparators?high-gain bandwidth requires design precautions to maximize their high-speed capa- bility. the recommended precautions are: 1) use a pcb with an unbroken, low-inductance ground plane. 2) place a decoupling capacitor (a 0.1? ceramic capacitor is a good choice) as close to v cc as possible. 3) on the inputs and outputs, keep lead lengths short to avoid unwanted parasitic feedback around the comparators. 4) solder the devices directly to the pcb instead of using a socket. v rising: v = v x r1 x 1 r1 v falling in thr ref in : ++ + ? ? ? ? ? ? = ? + ? ? ? ? ? ? = ? 1 2 1 34 1 34 rrr vv rxv rr hysteresis v v thf thr cc thr thf r2 = 1 v v thr ref xr r r r 1 1 1 1 34 ? ? ? ? ? ? ?? + v rising: v = v x r1 x 1 r1 v falling in thr ref in : ++ ? ? ? ? ? ? = ? ? ? ? ? ? ? = ? 1 2 1 3 1 3 rr vv rxv r hysteresis v v thf thr cc thr thf r2 = 1 v v r2 = 1 3.0v 1.2 x 12k thr ref . . xr r r km k 1 1 1 1 3 1 12 1 22 803 ? ? ? ? ? ? ?? ? ? ? ? ? ? ?? = ?? ? ? v ee v cc out r3 r2 r1 r4 0.1 f v ref v in v cc max988 max992 max996 figure 2. additional hysteresis (max988/max992/max996)
max987/max988/max991/max992/max995/max996 high-speed, micropower, low-voltage, sot23, rail-to-rail i/o comparators 10 ______________________________________________________________________________________ zero-crossing detector figure 3 shows a zero-crossing detector application. the max987? inverting input is connected to ground, and its noninverting input is connected to a 100mvp-p signal source. as the signal at the noninverting input crosses 0v, the comparator? output changes state. logic-level translator figure 4 shows an application that converts 5v logic lev- els to 3v logic levels. the max988 is powered by the +5v supply voltage, and the pullup resistor for the max988? open-drain output is connected to the +3v supply volt- age. this configuration allows the full 5v logic swing with- out creating overvoltage on the 3v logic inputs. for 3v to 5v logic-level translation, simply connect the +3v supply to v cc and the +5v supply to the pullup resistor. max987 in+ 4 3 out 1 2 5 v cc 100mv v cc v ee in- 0.1 f max988 in- 100k ? 100k ? 4 3 r pullup 3v (5v) logic out out 1 5 2 v cc +5v (+3v) +3v (+5v) v ee 5v (3v) logic in in+ 0.1 f figure 3. zero-crossing detector figure 4. logic-level translator pin configurations (continued) 14 13 12 11 10 9 8 1 2 3 4 5 6 7 outd ind- ind+ v ee v cc ina+ ina- outa max995 max996 inc+ inc- outc outb inb- inb+ so/tssop out n.c. v ee 1 2 8 7 n.c. v cc in- in+ n.c. so top view 3 4 6 5 max987 max988 inb- inb+ v ee 1 2 8 7 v cc outb ina- ina+ outa so/ max/sot23 3 4 6 5 max991 max992
max987/max988/max991/max992/max995/max996 high-speed, micropower, low-voltage, sot23, rail-to-rail i/o comparators ______________________________________________________________________________________ 11 __ordering information (continued) typical application circuit max98_ max99_ in+ 0.1 f *r pullup threshold detector * max988/max992/max996 only v in out v cc v cc v ee v ref in- __________________________________________________tape-and-reel information 4.0 0.1 0.30 0.05 0.8 0.05 0.30r max. b o k o 2.2 0.1 0.5 radius typical a0 4.0 0.1 2.0 0.05 1.5 +0.1/-0.0 diameter 1.75 0.1 1.0 0.1 a 8.0 0.3 3.5 0.05 1.0 minimum a ao = 3.1mm 0.1 bo = 2.7mm 0.1 ko = 1.2mm 0.1 note: dimensions are in mm. and follow eia481-1 standard. part pin-package pkg code top mark max988 exk-t 5 sc70-5 x5-1 abn max988euk-t 5 sot23-5 u5-1 abzc max988esa 8 so s8-2 max991 eka-t 8 sot23-8 k8-5 aaeb max991eua-t 8 max-8 u8-1 max991esa 8 so s8-2 max992 eka-t 8 sot23-8 k8-5 aaec MAX992EUA-T 8 max-8 u8-1 max992esa 8 so s8-2 max995 eud 14 tssop u14-1 max995esd 14 so s14-4 max996 eud 14 tssop u14-1 max996esd 14 so s14-4 note: all devices specified over the -40 c to +85 c operating temperature range.
max987/max988/max991/max992/max995/max996 high-speed, micropower, low-voltage, sot23, rail-to-rail i/o comparators 12 ______________________________________________________________________________________ sot-23 5l .eps package information (the package drawing(s) in this data sheet may not reflect the most current specifications. for the latest package outline info rmation go to www.maxim-ic.com/packages .)
maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a maxim product. no circu it patent licenses are implied. maxim reserves the right to change the circuitry and specifications without notice at any time. maxim integrated products, 120 san gabriel drive, sunnyvale, ca 94086 408-737-7600 ____________________ 13 2007 maxim integrated products is a registered trademark of maxim integrated products, inc. max987/max988/max991/max992/max995/max996 high-speed, micropower, low-voltage, sot23, rail-to-rail i/o comparators 8lumaxd.eps package outline, 8l umax/usop 1 1 21-0036 j rev. document control no. approval proprietary information title: max 0.043 0.006 0.014 0.120 0.120 0.198 0.026 0.007 0.037 0.0207 bsc 0.0256 bsc a2 a1 c e b a l front view side view e h 0.60.1 0.60.1 ?0.500.1 1 top view d 8 a2 0.030 bottom view 1 6 s b l h e d e c 0 0.010 0.116 0.116 0.188 0.016 0.005 8 4x s inches - a1 a min 0.002 0.95 0.75 0.5250 bsc 0.25 0.36 2.95 3.05 2.95 3.05 4.78 0.41 0.65 bsc 5.03 0.66 6 0 0.13 0.18 max min millimeters - 1.10 0.05 0.15 dim package information (continued) (the package drawing(s) in this data sheet may not reflect the most current specifications. for the latest package outline info rmation go to www.maxim-ic.com/packages .) revision history pages changed at rev 2: 1?, 8?3

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