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general description the max985/max986/max989/max990/max993/ max994 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 sys- tems. these comparators also operate with ?.25v to ?.75v dual supplies. they consume only 11? of sup- ply current while achieving a 300ns propagation delay. input bias current is typically 1.0pa, and input offset voltage 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 max985/max989/max993 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 max986/max990/max994 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 max985/max986 are available in tiny 5-pin sc70 packages, while the dual max989/max990 are available in ultra-small 8-pin sot23 packages. ____________________________features 11a quiescent supply current +2.5v to +5.5v single-supply operation common-mode input voltage range extends 250mv beyond the rails 300ns propagation delay push/pull output stage sinks and sources 8ma current (max985/max989/max993) open-drain output voltage extends beyond v cc (max986/max990/max994) unique output stage reduces output switching current, minimizing overall power consumption 80a supply current at 1mhz switching frequency no phase reversal for overdriven inputs available in space-saving packages: sot23 (max985/max986/max989/990) max (max989/max990) max985/max986/max989/max990/max993/max994 micropower, low-voltage, sot23, rail-to-rail i/o comparators ________________________________________________________________ maxim integrated products 1 v cc in- in+ 1 5 v ee out max985 max986 sot23/sc70 top view 2 3 4 pin configurations 19-1229; rev 2; 1/01 ordering information ordering information continued at end of data sheet. typical application circuit appears at end of data sheet. rail-to-rail is a registered trademark of nippon motorola ltd. 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 applications ir receivers digital line receivers for price, delivery, and to place orders, please contact maxim distribution at 1-888-629-4642, or visit maxim? website at www.maxim-ic.com. part temp. range pin- package top mark max985 exk-t -40 c to +85 c 5 sc70-5 abk max985euk-t -40 c to +85 c 5 sot23-5 abyz max985esa -40 c to +85 c 8 so applications selector guide part comparators per package output stage max985 1 push/pull max986 1 open-drain max989 2 push/pull max990 2 open-drain max993 4 push/pull max994 4 open-drain
max985/max986/max989/max990/max993/max994 micropower, low-voltage, sot23, rail-to-rail i/o comparators 2 _______________________________________________________________________________________ absolute maximum ratings electrical characteristics (v cc = +2.7v to +5.5v, v ee = 0v, v cm = 0v, t a = -40 c to +85 c, unless otherwise noted. typical values are at t a = +25 c.) (note 1) 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) out_ to v ee max985/max989/max993 ....................-0.3v to (v cc + 0.3v) max986/max990/max994.....................................-0.3v to 6v out_ short-circuit duration to v ee or v cc ...........................10s continuous power dissipation (t a = +70 c) 5-pin sc70 (derate 3.1mw/ c above +70 c) ...............247mw 5-pin sot23 (derate 7.10mw/ c above +70 c)...........571mw 8-pin sot23 (derate 9.1mw/ c above +70 c).............727mw 8-pin so (derate 5.88mw/ c above +70 c).................471mw 8-pin max (derate 4.5mw/ c above +70 c) ..............362mw 14-pin tssop (derate 9.1mw/ c above +70 c) ..........727mw 14-pin so (derate 8.33mw/ c above +70 c)...............667mw operating temperature range ...........................-40 c to +85 c storage temperature range .............................-65 c to +150 c lead temperature (soldering, 10s) .................................+300 c inferred from psrr test conditions v 2.5 5.5 v cc supply voltage units min typ max symbol parameter 12 20 2.5v v cc 5.5v db 55 80 psrr power-supply rejection ratio v cc = 5v 24 mv 0.5 5 t a = +25 c v ee -v cc + 0.25 0.25 3 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 52 80 cmrr common-mode rejection ratio pa 0.5 i os input offset current 7 v os input offset voltage (note 3) v out = high a 1.0 i leak output leakage current (max986/max990/ max994 only) 35 95 t a = +25 c t a = -40 c to +85 c 11 20 v cc = 2.7v a 24 i cc supply current per comparator t a = +25 c t a = -40 c to +85 c sourcing or sinking, v out = v ee or v cc i sc output short-circuit current t a = +25 c t a = -40 c to +85 c t a = -40 c to +85 c 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 c t a = -40 c to +85 c t a = +25 c t a = -40 c to +85 c t a = +25 c v cc = 5v, i source = 8ma t a = -40 c to +85 c 4.45 4.6 4.85 v oh t a = +25 c out output voltage high (max985/max989/ max993 only) v cc = 2.7v, i source = 3.5ma t a = -40 c to +85 c v 2.3 2.4 2.55
max985/max986/max989/max990/max993/max994 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 c to +85 c, unless otherwise noted. typical values are at t a = +25 c.) (note 1) conditions units min typ max symbol parameter v cc = 5.0v ns 80 t rise out rise time (max985/max989/ max993 only) 50 40 s 20 t pu power-up time ns v cc = 5.0v 80 t fall out fall time 50 40 300 450 100mv overdrive 100mv overdrive c l = 15pf 300 t pd+ propagation delay 450 ns 450 t pd- 300 max985/max989/ max993 only 10mv overdrive 100mv overdrive max985/max989/ max993 only, c l = 15pf 10mv overdrive 10mv overdrive c l = 15pf c l = 50pf c l = 200pf c l = 15pf c l = 50pf c l = 200pf max986/max990/ max994 only, r pull-up = 5.1k ? note 1: all device specifications are 100% production tested at t a = +25 c. 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+ ).
max985/max986/max989/max990/max993/max994 micropower, low-voltage, sot23, rail-to-rail i/o comparators 4 _______________________________________________________________________________________ __________________________________________typical operating characteristics (v cc = 5v, v cm = 0v, t a = +25 c, unless otherwise noted.) 10,000 1 0.01 0.1 1 10 100 output low voltage vs. output sink current max985-04 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 600 350 0 200 1000 propagation delay vs. capacitive load (v cc = 3v) 500 450 400 550 max985-05a capacitive load (pf) t pd (ns) 400 800 600 v od = 50mv to v out = 50% of final value to v out = 10% of final value 120 0 -60 100 output short-circuit current vs. temperature 20 10 90 80 110 100 max985-06 temperature (?) output sink current (ma) -40 -20 0 20 40 60 80 70 60 50 40 30 v cc = 5.0v v cc = 2.7v 530 350 0 200 1000 propagation delay vs. capacitive load (v cc = 5v) 450 430 410 390 370 510 490 470 max985-05b capacitive load (pf) t pd (ns) 400 800 600 v od = 50mv to v out = 50% of final value to v out = 10% of final value 1.1 -0.3 -60 100 input offset voltage vs. temperature -0.1 0.7 0.9 max985-07 temperature ( c) offset voltage (mv) -40 -20 0 20 40 60 80 0.5 0.3 0.1 10,000 0.1 0.01 0.1 1 10 100 output high voltage vs. output source current 1 max985-08 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 18 8 -60 100 supply current vs. temperature 10 9 16 17 15 max985-01 temperature ( c) supply current ( a) -40 -20 0 20 40 60 80 14 13 12 11 v in+ > v in- v cc = 5.0v v cc = 2.7v 1000 1 0.01 0.1 1 10 100 1000 supply current vs. output transition frequency max985-02 output transition frequency (khz) supply current ( a) 10 100 v cc = 5.0v v cc = 2.7v
max985/max986/max989/max990/max993/max994 micropower, low-voltage, sot23, rail-to-rail i/o comparators _______________________________________________________________________________________ 5 max985/max989/max993 switching current, out rising in+ out i cc max985-13 100ns/div 50mv/ div 2v/div 1ma/div v od = 50mv switching current, out falling in+ out i cc max985-14 100ns/div 50mv/ div 2v/div 1ma/div v od = 50mv 1mhz response in+ out max985-15 200ns/div 50mv/ div 2v/div v od = 50mv power-up delay v cc out max985-16 5 s/div v in- = 50mv v in+ = 0v 900 800 700 600 0 0 80 120 160 200 propagation delay vs. input overdrive 500 400 300 200 100 max985-10 input overdrive (mv) t pd (ns) 40 v cc = 2.7v v cc = 5.0v 450 380 -40 100 propagation delay vs. temperature 390 430 440 max985-09 temperature ( c) t pd (ns) -200 20406080 420 410 400 to v out = 50% point of final value to v out = 10% point of final value v od = 50mv max985/max989/max993 propagation delay (t pd+ ) in+ out max985-11 100ns/div 50mv/ div 2v/div v od = 50mv propagation delay (t pd- ) in+ out max985-12 100ns/div 50mv/ div 2v/div v od = 50mv ____________________________typical operating characteristics (continued) (v cc = 5v, v cm = 0v, t a = +25 c, unless otherwise noted.)
max985/max986/max989/max990/max993/max994 micropower, low-voltage, sot23, rail-to-rail i/o comparators 6 _______________________________________________________________________________________ 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 max993 max994 max989 max990 so/max/ sot23 max985 max986 sot23/ sc70 so pin name function
max985/max986/max989/max990/max993/max994 micropower, low-voltage, sot23, rail-to-rail i/o comparators _______________________________________________________________________________________ 7 _______________detailed description the max985/max986/max989/max990/max993/ max994 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 11a. their c ommon-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 max985/max989/max993 have a push/pull output structure that sinks as well as sources current. the max986/max990/max994 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 graph supply current vs. output transition frequency 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. another advantage realized in high- speed, battery-powered applications is a substantial increase in battery life. __________applications information additional hysteresis max985/max989/max993 the max985/max989/max993 have 3mv 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 max985/max989/max993. 1) select r3. leakage current at in is under 10na, so the current through r3 should be at least 1a to minimize errors caused by leakage current. the cur- rent through r3 at the trip point is (v ref - v out ) / r3. considering the two possible output states in solving for r3 yields two formulas: r3 = v ref / 1a or r3 = (v ref - v cc ) / 1a. 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. v cc max985 max989 max993 out r3 r1 r2 v ref v ee v in v cc figure1. additional hysteresis (max985/max989/max993)
max985/max986/max989/max990/max993/max994 micropower, low-voltage, sot23, rail-to-rail i/o comparators 8 _______________________________________________________________________________________ 5) calculate r2 as follows. for this example, choose an 8.2k ? standard value: 6) verify trip voltages and hysteresis as follows: max986/max990/max994 the max986/max990/max994 have 3mv internal hysteresis. they have open-drain outputs and require an external pull-up resistor (figure 2). additional hys- teresis can be generated using positive feedback, but the formulas differ slightly from those of the max985/max989/max993. use the following procedure to calculate resistor values: 1) select r3 according to the formulas r3 = v ref / 500a or r3 = (v ref - v cc ) / 500a - 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: board layout and bypassing power-supply bypass capacitors are not typically need- ed, but use 100nf bypass capacitors when supply impedance is high, when supply leads are long, or when excessive noise is expected on the supply lines. minimize signal trace lengths to reduce stray capacitance. 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 v ref v in v cc max986 max990 max994 figure 2. additional hysteresis (max986/max990/max994)
max985/max986/max989/max990/max993/max994 micropower, low-voltage, sot23, rail-to-rail i/o comparators _______________________________________________________________________________________ 9 zero-crossing detector figure 3 shows a zero-crossing detector application. the max985 s 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 s output changes state. logic-level translator figure 4 shows an application that converts 5v logic lev- els to 3v logic levels. the max986 is powered by the +5v supply voltage, and the pull-up resistor for the max986 s 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 pull-up resistor. max985 in+ 4 3 out 1 2 5 v cc 100mv v cc v ee in- max986 in- 100k 100k 4 3 r pull-up 3v (5v) logic out out 1 5 2 v cc +5v (+3v) +3v (+5v) v ee 5v (3v) logic in in+ 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 max993 max994 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 max985 max986 inb- inb+ v ee 1 2 8 7 v cc outb ina- ina+ outa so/ max/sot23 3 4 6 5 max989 max990
max985/max986/max989/max990/max993/max994 micropower, low-voltage, sot23, rail-to-rail i/o comparators 10 ______________________________________________________________________________________ ordering information (continued) typical application circuit max98_ max99_ in+ *r pull-up threshold detector * max986/max990/max994 only v in out v cc v cc v ee v ref in- part temp. range pin- package top mark max986 exk-t -40 c to +85 c 5 sc70-5 abl max986euk-t -40 c to +85 c 5 sot23-5 abza max986esa -40 c to +85 c 8 so max989 eka-t -40 c to +85 c 8 sot23-8 aadz max989eua -40 c to +85 c8 max max989esa -40 c to +85 c 8 so max990 eka-t -40 c to +85 c 8 sot23-8 aaea max990eua -40 c to +85 c8 max max990esa -40 c to +85 c 8 so max993 eud -40 c to +85 c 14 tssop max993esd -40 c to +85 c 14 so max994 eud -40 c to +85 c 14 tssop max994esd -40 c to +85 c 14 so
max985/max986/max989/max990/max993/max994 micropower, low-voltage, sot23, rail-to-rail i/o comparators ______________________________________________________________________________________ 11 ________________________________________________________package information sot5l.eps
max985/max986/max989/max990/max993/max994 micropower, low-voltage, sot23, rail-to-rail i/o comparators ___________________________________________package information (continued) 8lumaxd.eps 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. 12 ____________________maxim integrated products, 120 san gabriel drive, sunnyvale, ca 94086 408-737-7600 ? 2001 maxim integrated products printed usa is a registered trademark of maxim integrated products.

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