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LTC6702 1 6702f typical application features applications description tiny micropower, low voltage dual comparators the ltc ? 6702 is an extremely small dual comparator designed to maximize battery life while providing both speed and low voltage operation in applications where board space is a premium. these comparators operate on supplies between 1.7v and 5.5v, and have a maximum guaranteed propagation delay of 500ns while drawing only 30a maximum quiescent current. internal hysteresis desensitizes the LTC6702 to input noise and makes it easy to use, even with slow mov- ing signals. cmos inputs allow the use of large source impedances. the LTC6702 is available in the 8-pin sot-23 and the tiny 2mm 2mm dfn package. propagation delay vs input overdrive n low supply operation: 1.7v minimum n low supply current: 30a/comparator maximum n propagation delay: 500ns maximum (C40c to 125c) n 3.2mhz toggle frequency n input voltage range extends 100mv below ground n internal hysteresis: 4mv n high output drive: ttl and cmos compatible speci? ed at 15ma (C40c to 125c), capacitive load handling to 10,000pf n speci? ed for C40c to 125c temperature range n available in sot-23 and 2mm 2mm dfn package n battery powered systems n window comparators n threshold detectors/discriminators n clock regeneration n automotive sensing and controls clock regeneration circuit 0.1 m f 6702 ta01 ? + ? + 1/2 LTC6702 lt6650 1k recovered clock (up to 3.2mhz) clock input > 100mv p-p c1 0.1 m f v + = 3v v r = 400mv reference in out fb l , lt, ltc and ltm are registered trademarks of linear technology corporation. all other trademarks are the property of their respective owners. input overdrive (mv) 0 propagation delay (ns) 400 500 600 30 50 80 6702 ta01b 300 200 100 10 20 40 60 70 falling rising v + = 5v v step = 100mv c load = 10pf t a = 25 c
LTC6702 2 6702f pin configuration absolute maximum ratings supply voltage (v + to gnd) ........................................6v input voltage ...............................................................6v input current ........................................................?10ma output short-circuit duration (note 2) ............ inde? nite operating temperature range (note 3) LTC6702c ...........................................?40c to 85c LTC6702i .............................................?40c to 85c LTC6702h .........................................?40c to 125c speci? ed temperature range (note 4) (note 1) top view out a ?in a +in a gnd v + out b ?in b +in b dc package 8-lead (2mm 2mm) plastic dfn 9 4 1 2 3 6 5 7 8 a b t jmax = 150c,
LTC6702 3 6702f electrical characteristics symbol parameter conditions min typ max units v + supply voltage guaranteed by psrr l 1.7 5.5 v i+ supply current per comparator v + = 3v l 24 30 40 a a v + = 5v l 25 32 42 a a v os input offset voltage (note 5) LTC6702c/LTC6702i LTC6702h l l 1 3.5 5 6 mv mv mv v hyst input hysteresis voltage (note 5) LTC6702c/LTC6702i LTC6702h l l 2.5 1.6 1.6 4.3 6.2 7.2 8.2 mv mv mv 6 v os / 6 t input offset voltage drift (note 5) l 6 v/ c i in input leakage current LTC6702c/LTC6702i LTC6702h l l 0.001 1 10 na na na cmrr common mode rejection ratio v cm = C0.1v to v dd C 1.2v l 58 56 70 db db input voltage range guaranteed by cmrr l C0.1 v dd C 1.2 v psrr power supply rejection ratio v + = 1.7v to 5.5v, v cm = 0.5v l 56 54 65 db db v ol output swing low overdrive = 20mv (note 6) i sink = 100a i sink = 15ma l l 10 250 mv mv mv v oh output swing high overdrive = 20mv (note 6) i source = 100a i source = 15ma l l 10 350 mv mv mv t pd propagation delay (note 7) l 320 450 500 ns ns 6 t pd differential propagation delay between channels 4 ns t skew propagation delay skew between t pdlh /t pdhl 4 ns t r output rise time 11 ns t f output fall time 15 ns f max maximum toggle frequency 3.2 mhz i sc short-circuit current v + = 5v 250 ma the l denotes the speci? cations which apply over the full speci? ed temperature range, otherwise speci? cations are at t a = 25c. v + = 3v, v cm = 1.5v, c out = 20pf, unless otherwise noted. note 1: stresses beyond those listed under absolute maximum ratings may cause permanent damage to the device. exposure to any absolute maximum rating condition for extended periods may affect device reliability and lifetime. note 2: a heat sink may be required to keep the junction temperature below absolute maximum. this depends on the power supply voltage and how many comparators are shorted. the e ja speci? ed for the dc and ts packages is with minimal pcb heat spreading metal. using expanded metal area on all layers of a board reduces this value. note 3: the LTC6702c and LTC6702i are guaranteed functional over the temperature range of C40c to 85c. the LTC6702h is guaranteed functional over the operating temperature range of C40c to 125c. note 4: the LTC6702c is guaranteed to meet speci? ed performance from 0c to 70c. the LTC6702c is designed, characterized and expected to meet speci? ed performance from C40c to 85c but is not tested or qa sampled at these temperatures. the LTC6702i is guaranteed to meet speci? ed performance from C40c to 85c. the LTC6702h is guaranteed to meet speci? ed performance from C40c to 125c. note 5: the LTC6702 comparators include internal hysteresis. the offset voltage is de? ned as the average of the input voltages (trip points) required to change the output in each direction minus v cm , while the hysteresis voltage is the difference of these trip points. note 6: output voltage swings are measured between the output and power supply rails. note 7: propagation delay is for 200mv steps, and 50mv of overdrive. overdrive is measured relative to the positive and negative trip points.
LTC6702 4 6702f supply current vs supply voltage supply current vs temperature input leakage current vs input voltage input offset current vs input voltage input offset voltage vs supply voltage hysteresis vs supply voltage input common mode limits vs temperature typical performance characteristics supply current vs toggle rate maximum toggle rate vs temperature supply voltage (v) 0 0 supply current per comparator ( + a) 10 20 30 40 50 1 234 56 125 c 25 c C55 c 6702 g01 temperature ( c) C50 20 25 35 25 75 6702 g02 15 10 C25 0 50 100 125 5 0 30 supply current per comparator ( + a) v + = 5v v + = 1.7v v + = 3v C55 c input voltage (v) C1 C1 input leakage current (na) 0 2 3 4 5 1 3 4 1 0 2 5 6 6702 g03 125 c 85 c v + = 3v 25 c input voltage (v) C1 0 input offset current (pa) 30 40 50 100 70 1 3 4 80 90 60 0 2 5 6 6702 g04 v + = 3v 10 20 125 c 85 c 25 c C55 c toggle rate (hz) 10k 200 supply current per comparator ( + a) 250 300 350 400 100k 1m 10m 150 100 50 0 450 6702 g05 v + = 1.7v v + = 3v v + = 5v v step = 200mv overdrive = 100mv t a = 25 c no c load temperature ( c) C50 4 25 75 6702 g06 3 C25 0 50 100 125 2 maximum toggle rate (mhz) v + = 5v v + = 1.7v v + = 3v v step = 200mv overdrive = 100mv c load = 10pf 6702 g07 supply voltage (v) 1 input offset voltage (mv) 1 3 5 5 C1 C3 0 2 4 C2 C4 C5 2 3 4 6 125 c C55 c 25 c supply voltage (v) 1 hysteresis (mv) 3 4 5 4 6 2 1 0 23 5 6 7 8 6702 g08 125 c 25 c C55 c temperature ( c) C50 input common mode limits (v) v + C1.0 v + C0.5 v + 25 75 v + C1.5 gnd C25 0 50 100 125 C0.5 C1.0 6702 g09
LTC6702 5 6702f typical performance characteristics propagation delay vs supply voltage propagation delay vs load capacitance output rise and fall times vs load capacitance output low voltage vs load current output high voltage vs load current output voltage vs temperature propagation delay propagation delay with load 1mhz sinusoid response supply voltage (v) 1 propagation delay (ns) 340 360 380 4 6 320 300 280 23 5 400 420 6702 g10 falling falling rising rising v step = 100mv c load = 10pf 25 c, 125 C55 c load capacitance (pf) 10 200 propagation delay (ns) 600 700 800 100 1000 10000 6702 011 500 400 300 v + = 1.7v falling rising v step = 100mv overdrive = 50mv t a = 25 c falling rising v + = 3v, 5v load capacitance (pf) 10 1 time (ns) 10 100 1000 100 1000 10000 6702 g12 v step = 100mv overdrive = 50mv t a = 25 c t f t r t f t r t f t r v + = 1.7v v + = 3v v + = 5v sink current (ma) 0.1 0.001 output voltage (v) 0.01 0.1 1.0 1 10 100 6702 g13 v + = 3v v + = 1.7v v + = 5v t a = 25 c source current (ma) 0.1 0.001 output voltage (v + -v out ) (v) 0.01 0.1 1.0 1 10 100 6702 g14 v + = 3v v + = 1.7v v + = 5v t a = 25 c temperature ( c) C50 0 output voltage (mv) 10 30 40 50 50 90 20 0 C25 75 100 25 125 60 70 80 6702 g15 low low high high high = v + C v out i out = 4ma v + = 1.7v v + = 5v 100ns/div v out 1v/div gnd v in 50mv/div 6702 g16 v + = 3v c l = 20pf v cm = 500mv 100ns/div v out 1v/div gnd v in 50mv/div 6702 g17 v + = 3v c l = 20pf v cm = 500mv r l = 10k, 200 1 200 1 10k 200ns/div v out 1v/div gnd v in 50mv/div 6702 g18 v + = 3v c l = 20pf v cm = 500mv
LTC6702 6 6702f pin functions out a (pin 1): output of comparator a. Cin a (pin 2): inverting input of comparator a. +in a (pin 3): noninverting input of comparator a. gnd (pin 4): ground. +in b (pin 5): noninverting input of comparator b. Cin b (pin 6): inverting input of comparator b. out b (pin 7): output of comparator b. v + (pin 8): positive supply voltage exposed pad (pin 9, dc package only): ground. the exposed pad must be soldered to pcb. simplified schematic v + out 750 1 750 1 gnd Cin +in 6702 ss
LTC6702 7 6702f applications information the LTC6702 device is a fast (500ns delay), low power, low voltage (1.7v to 5.5v supply) general purpose dual comparator. it provides rail-to-rail outputs able to interface to ttl/cmos, draws low supply currents (30a/compara- tor), and has internal hysteresis (approximately 4mv). hysteresis each comparator has built-in hysteresis to simplify designs, to insure stable operation in the presence of noise at the inputs, and to reject supply rail noise. the reference voltage applied to the input is not the exact switching threshold value due to the built-in hysteresis. actual output switching typically occurs within 2.2mv of the reference voltage, plus or minus the input offset voltage. external positive feedback circuitry can be employed to increase effective hysteresis if desired as shown in figure 1. this circuitry will provide an apparent effect on both the rising and fall- ing input thresholds (the actual internal trip points remain unaffected). if an inverting con? guration with hysteresis is needed, simply swap the v in and v ref connections. unused inputs any unused inputs should be connected in a way that ? xes the output logic state high or low. one easy way to do this is to tie +in to v + and Cin to gnd. input protection external input protection circuitry is only needed if currents would otherwise exceed the absolute maximum rating. inputs driven further negative than 100mv below ground will not cause damage provided the current is limited to 10ma. esd protection diodes are provided to prevent damage during handling. comparator input the allowable input voltage ranges from 100mv below gnd to within 1.2v of the positive supply. the input may be forced below ground without causing an improper output, though some additional input current will begin to ? ow from the esd input protection diode. the inputs can reach up to 6v independent of the v + supply voltage without causing additional input current or damage to the part. as long as one input is within the allowable input voltage range, the LTC6702 will continue to function normally. comparator output the comparator output is a push-pull cmos stage guaranteed to swing to within 350mv of v + and 250mv of ground, over temperature when sourcing or sinking 15ma. no external pull-up/down resistor is required. to figure 1. additional hysteresis circuit for noninverting con? guration additional hystersis = r1 r 3 ?v + trip voltages: v in(l h) = v ref ?r1? 1 r 1 + 1 r 2 + 1 r 3 v in(h l) = v ref ?r1? 1 r 1 + 1 r 2 + 1 r 3 r1 r 3 ?v + example: additional hysteresis = 50mv, v + = 5v r1 = 10k r2 = 249k r3 = 1m for v ref = 0.5v : v in (l h) = 0.525v v in (h l) = 0.475v ? + 1/2 LTC6702 r2 v ref r3 6702 f01 v in r1
LTC6702 8 6702f applications information maintain micropower operation, the output stage uses a break-before-make circuit. the break interval of this circuit turns off both the pull-up and pull-down devices for tens of nanoseconds before activating the appropriate output transistor (depends on the output transition direction). any load connected to the output will charge or discharge internal capacitance during this interval. this can create a soft corner during output transitions and also decrease the propagation delay. the typical performance characteristics section shows this behavior under three load conditions: unloaded, 10k to ground and 200 1 to ground. loads to v + have a similar affect when the output is transitioning from low to high. power supplies the comparator circuitry operates from a single 1.7v to 5.5v. a 0.1f minimum bypass capacitor is required between the v + pin and gnd. when the output is sinking at least 1ma, a 1f bypass capacitor is recommended. pulsing the v + supply to the comparators on and off may engage the esd protection circuitry at the v + pin. if this occurs, current is pulled from the v + pin through the output stage. using the recommended supply bypass capacitors with some series resistance in the v + supply line will help to prevent this action in pulsed supply applications. level translators the level translators in the typical applications section show an adjustable high-precision voltage reference enabling the user to vary the threshold voltage. simply adjusting the ratio of the two resistors changes the thresh- old voltage according to the following equation: v thr = 0.4 1 + r f r g low to high level translator typical applications ? + 1/2 LTC6702 2v 0v 0v out 6702 ta02 5.5v 5.5v 100k 24.9k lt6650 gnd fb out in 500mv 1 + f 0.1 + f
LTC6702 9 6702f typical applications high to low level translator micropower battery monitor with fast response ? + 1/2 LTC6702 6v 0v 0v out 6702 ta03 1.8v 1.8v lt6650 gnd fb out in 500mv 1 + f 0.1 + f 100k 24.9k 6702 ta04 ? + ? + r1 909k r2 332k r3 1m v batt outa (0v if v batt < 2.8v) outb (0v if v batt < 2.1v) compa compb lt1790-1.25 LTC6702 gnd out in 1 + f c1 0.1 + f 0.1 + f
LTC6702 10 6702f package description dc package 8-lead plastic dfn (2mm 2mm) (reference ltc dwg # 05-08-1719 rev ?) 2.00 0.10 (4 sides) note: 1. drawing is not a jedec package outline 2. drawing not to scale 3. all dimensions are in millimeters 4. dimensions of exposed pad on bottom of package do not include mold flash. mold flash, if present, shall not exceed 0.15mm on any side 5. exposed pad shall be solder plated 6. shaded area is only a reference for pin 1 location on the top and bottom of package 0.40 0.10 bottom view?exposed pad 0.64 0.10 (2 sides) 0.75 0.05 r = 0.115 typ r = 0.05 typ 1.37 0.10 (2 sides) 1 4 8 5 pin 1 bar top mark (see note 6) 0.200 ref 0.00 ? 0.05 (dc8) dfn 0106 rev? 0.23 0.05 0.45 bsc 0.25 0.05 1.37 0.05 (2 sides) recommended solder pad pitch and dimensions apply solder mask to areas that are not soldered 0.64 0.05 (2 sides) 1.15 0.05 0.70 0.05 2.55 0.05 package outline 0.45 bsc pin 1 notch r = 0.20 or 0.25 45 chamfer
LTC6702 11 6702f information furnished by linear technology corporation is believed to be accurate and reliable. however, no responsibility is assumed for its use. linear technology corporation makes no representa- tion that the interconnection of its circuits as described herein will not infringe on existing patent rights. ts8 package 8-lead plastic tsot-23 (reference ltc dwg # 05-08-1637) package description 1.50 ? 1.75 (note 4) 2.80 bsc 0.22 ? 0.36 8 plcs (note 3) datum ?a? 0.09 ? 0.20 (note 3) ts8 tsot-23 0802 2.90 bsc (note 4) 0.65 bsc 1.95 bsc 0.80 ? 0.90 1.00 max 0.01 ? 0.10 0.20 bsc 0.30 ? 0.50 ref pin one id note: 1. dimensions are in millimeters 2. drawing not to scale 3. dimensions are inclusive of plating 4. dimensions are exclusive of mold flash and metal burr 5. mold flash shall not exceed 0.254mm 6. jedec package reference is mo-193 3.85 max 0.52 max 0.65 ref recommended solder pad layout per ipc calculator 1.4 min 2.62 ref 1.22 ref
LTC6702 12 6702f linear technology corporation 1630 mccarthy blvd., milpitas, ca 95035-7417 (408) 432-1900 fax: (408) 434-0507 www.linear.com ? linear technology corporation 2007 lt 0907 ? printed in usa related parts typical application part number description comments ltc1441/ltc1442 dual ultralow power comparators with reference 1.182v 1% reference, 8s propagation delay, 5.7a ltc1541/ltc1542 micropower ampli? er with comparator and reference 1.2v 0.8% reference, ampli? er stable with 1000pf load ltc1842/ltc1843 dual ultralow power comparators with reference 1.182v 1% reference, 4s, 3.5a, open-drain out lt6660 tiny micropower precision series references 0.2% reference, 20ppm/c drift, 20ma output, 2mm 2mm dfn package lt6700-1/lt6700-2/ lt6700-3 dual comparators with 400mv reference 1.4v to 18v operating range, 18s propagation delay, sot-23 package lt6703-2/lt6703-3 tiny single comparator with 400mv reference 1.4v to 18v operating range, 18s propagation delay, 2mm 2mm dfn package gnd led b led a 6702 ta05 ? + ? + 1k 1k r sb 0.1 7 LTC6702 5.5v comp a i loadb i loada r sa 0.1 7 61.9k 37.4k 24.9k 500mv leda on if i loada > 2.5a ledb on if i loadb > 5.0a comp b v + load b load a lt6650 gnd fb out in 1 m f 0.1 m f dual low side current sense alarm

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