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general description the max16008/max16009 are adjustable quad window voltage detectors in a small thin qfn package. these devices are designed to provide a higher level of sys- tem reliability by monitoring multiple supply voltages and providing a fault signal when any of the voltages exceed their overvoltage thresholds or fall below their undervoltage thresholds. these devices offer user-adjustable thresholds that allow voltages to be monitored down to 0.4v. these devices allow the upper and lower trip thresholds of each window detector to be set externally with the use of three external resistors. each monitored threshold has an independent open- drain output for signaling a fault condition. the outputs can be wire or?d together to provide a single fault output. the open-drain outputs are internally pulled up with a 30? current, but can be externally driven to other voltage levels for interfacing to other logic levels. both devices feature a margin input to disable the out- puts during margin testing or any other time after power-up operations. the max16009 offers a reset out- put that deasserts after a reset timeout period after all voltages are within their threshold specifications. the reset timeout is internally set to 140ms (min), but can be externally adjusted to other reset timeouts using an external capacitor. in addition, the max16009 offers a manual reset input. all devices are offered in a 4mm x 4mm tqfn package and are fully specified from -40 c to +125 c. applications storage equipment networking/telecommunications equipment multivoltage asics servers features ? monitor four undervoltage/overvoltage conditions ? 1.5% accuracy over temperature ? user-adjustable thresholds (down to 0.4v) ? open-drain outputs with internal pullups reduce the number of external components ? manual reset input (max16009) ? margin enable input ? fixed or adjustable reset timeout (max16009) ? guaranteed correct output logic state down to v cc = 1v ? fully specified from -40 c to +125 c ? small, 4mm x 4mm tqfn package max16008/max16009 low-voltage, high-accuracy, quad window voltage detectors in thin qfn ________________________________________________________________ maxim integrated products 1 part temp range pin-package max16008 tp+ -40 c to +125 c 20 tqfn max16009 tg+ -40 c to +125 c 24 tqfn ordering information 19-3869; rev 1; 1/11 for pricing, delivery, and ordering information, please contact maxim direct at 1-888-629-4642, or visit maxim? website at www.maxim-ic.com. gnd uvin1 uvout1 ovin1 uvin2 ovin2 uvin3 ovin3 2.5v 3.5v 1.8v 1.5v uvin4 ovin4 uvout2 uvout3 uvout4 ovout1 ovout2 ovout3 ovout4 c reset reset v cc v cc max16009 gnd typical operating circuit pin configurations and selector guide appear at end of data sheet. + denotes a lead(pb)-free/rohs-compliant package. for tape-and-reel, add a ??after the ?.?tape-and-reel are offered in 2.5k increments.
max16008/max16009 low-voltage, high-accuracy, quad window voltage detectors in thin qfn 2 _______________________________________________________________________________________ absolute maximum ratings electrical characteristics (v cc = 2.0v to 5.5v, tol = gnd, t a = -40 c to +125 c, unless otherwise specified. typical values are at v cc = 3.3v, 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. v cc , ovout_ , uvout_ , reset , uvin_, ovin_ to gnd .........................................-0.3v to +6v margin , mr , tol, srt to gnd................-0.3v to (v cc + 0.3v) input/output current ( reset , margin , srt, mr , uvout_ , ovout _) .......?0ma continuous power dissipation (t a = +70?) 20-pin thin qfn (derate 16.9mw/ c above +70 c) ....1355mw 24-pin thin qfn (derate 16.9mw/ c above +70 c) ....1666mw operating temperature range .........................-40 c to +125 c junction temperature .....................................................+150 c storage temperature range .............................-65 c to +150 c lead temperature (soldering, 10s) .................................+300 c soldering temperature (reflow) .......................................+260? parameter symbol conditions min typ max units operating voltage range v cc (note 2) 1.0 5.5 v v cc = 3.3v, outputs deasserted 45 65 supply current (note 3) i cc v cc = 5v, outputs deasserted 45 70 ? uvlo (undervoltage lockout) v uvlo v cc rising 1.62 1.8 1.98 v uvin_/ovin_ adjustable threshold (uvin_ falling/ovin_ rising) v th 0.388 0.394 0.400 v uvin_/ovin_ hysteresis v th _ hys uvin_ falling/ovin_ rising (percentage of the threshold) 0.5 % v th uvin_/ovin_ input current i ib -100 +100 na reset srt = v cc 140 200 280 c srt = 1500pf (note 4) 2.43 3.09 3.92 c srt = 100pf 0.206 reset timeout t rp c srt = open 0.05 ms srt ramp current i srt v srt = 0v 460 600 740 na srt threshold v th_srt 1.173 1.235 1.293 v srt hysteresis 100 mv uvin_/ovin_ to reset delay t rd uvin_ falling/ovin_ rising 20 s
max16008/max16009 low-voltage, high-accuracy, quad window voltage detectors in thin qfn _______________________________________________________________________________________ 3 note 1: devices are tested at t a = +25 c and guaranteed by design for t a = t min to t max . note 2: the outputs are guaranteed to be in the correct logic state down to v cc = 1v. note 3: measured with mr and margin unconnected. note 4: the minimum and maximum specifications for this parameter are guaranteed by using the worse case of the srt current and srt threshold specifications. do not set the reset timeout period to more than 1.12s. note 5: amount of time required for logic to lock/unlock outputs from margin testing electrical characteristics (continued) (v cc = 2.0v to 5.5v, tol = gnd, t a = -40 c to +125 c, unless otherwise specified. typical values are at v cc = 3.3v, t a = +25 c.) (note 1) parameter symbol conditions min typ max units v c c = 3.3v , i s in k = 10m a, re s e t asser ted 0.30 v cc = 2.5v, i sink = 6ma, re s e t asser ted 0.30 reset output-voltage low v ol v cc = 1.2v, i sink = 50?, re s e t asser ted 0.30 v reset output-voltage high v oh v cc 2.0v, i source = 6?, reset deasserted 0.8 x v cc v mr input-voltage low v il 0.3 x v cc v mr input-voltage high v ih 0.7 x v cc v mr minimum pulse width 1s mr glitch rejection 100 ns mr to reset delay 200 ns mr pullup resistance 12 20 28 k outputs ( uvout_ / ovout_ ) v cc = 3.3v, i sink = 2ma 0.30 uvout_ , ovout_ output- voltage low v ol v cc = 2.5v, i sink = 1.2ma 0.30 v ovout_ , ovout_ output- voltage high v oh v cc 2.0v, i source = 6a 0.8 x v cc v u v in _/ov in _ to uv o ut_/ o v o ut_ propagation delay t d (v th - 100mv) to (v th + 100mv) 20 ? digital logic tol input-voltage low v il 0.3 x v cc v tol input-voltage high v ih 0.7 x v cc v tol input current tol = v cc 100 na margin input-voltage low v il 0.3 x v cc v margin input-voltage high v ih 0.7 x v cc v margin pullup resistance pulled up to v cc 12 20 28 k margin delay time t md rising or falling (note 5) 50 ?
typical operating characteristics (v cc = 3.3v, t a = +25?, unless otherwise noted.) max16008/max16009 low-voltage, high-accuracy, quad window voltage detectors in thin qfn 4 _______________________________________________________________________________________ supply current vs. supply voltage max16008 toc01 supply voltage (v) supply current ( a) 5.0 4.5 4.0 3.5 3.0 2.5 2.0 35 40 45 50 55 60 30 1.5 5.5 margin and mr unconnected supply current vs. temperature max16008 toc02 temperature ( c) supply current ( a) 110 95 80 65 50 35 20 5 -10 -25 35 40 45 50 55 60 65 30 -40 125 margin and mr unconnected v cc = 5v v cc = 2.5v v cc = 3.3v uvin_/ovin_ threshold vs. supply voltage max16008 toc03 supply voltage (v) input threshold 5.0 4.5 4.0 3.5 3.0 2.5 2.0 0.400 0.375 0.425 0.450 0.350 1.5 5.5 uvin_/ovin_ threshold vs. temperature max16008 toc04 temperature ( c) input threshold 110 95 65 80 -10 5 20 35 50 -25 0.36 0.37 0.38 0.39 0.40 0.41 0.42 0.43 0.44 0.45 0.35 -40 125 output voltage vs. sink current max16008 toc05 sink current (ma) v out_ (mv) 7 6 5 4 3 2 1 25 50 75 100 0 08 uvout_ / ovout_ low 1 10 100 1000 maximum transient duration vs. input overdrive max16008 toc06 input overdrive (mv) maximum transient duration ( s) 600 0 100 200 300 400 500 output goes low above this line
max16008/max16009 low-voltage, high-accuracy, quad window voltage detectors in thin qfn _______________________________________________________________________________________ 5 reset timeout period vs. temperature max16008 toc07 temperature ( c) reset timeout period (ms) 110 95 -25 -10 5 35 50 65 20 80 191 192 193 194 195 196 197 198 190 -40 125 reset timeout delay max16008 toc08 uvin1 1v/div uvout1 2v/div reset 2v/div 40ms/div srt = v cc uvin_ to uvout_ delay time max16008 toc09 uvin1 2v/div uvout1 2v/div 4 s/div margin enable function max16008 toc10 margin 2v/div uvout_ 2v/div reset 2v/div 100 s/div uvin_ below respective thresholds typical operating characteristics (continued) (v cc = 3.3v, t a = +25?, unless otherwise noted.)
max16008/max16009 low-voltage, high-accuracy, quad window voltage detectors in thin qfn 6 _______________________________________________________________________________________ pin description pin max16008 max16009 name function 1 1 uvin3 undervoltage threshold input 3. when the voltage on uvin3 falls below its threshold, uvout3 asserts low. 2 2 ovin3 overvoltage threshold input 3. when the voltage on ovin3 rises above its threshold, ovout3 asserts low. 3 3 uvin4 undervoltage threshold input 4. when the voltage on uvin4 falls below its threshold, uvout4 asserts low. 4 4 ovin4 overvoltage threshold input 4. when the voltage on ovin4 rises above its threshold, ovout4 asserts low. 5 6 gnd ground 6, 20 7, 24 v cc unmonitored power to the device 78 uvout3 active-low undervoltage output 3. when the voltage at uvin3 falls below its threshold, uvout3 asserts low and stays asserted until the voltage at uvin3 exceeds its threshold. the open-drain output has a 30? internal pullup to v cc . 89 ovout3 active-low overvoltage output 3. when the voltage at ovin3 rises above its threshold, ovout3 asserts low and stays asserted until the voltage at ovin3 falls below its threshold. the open-drain output has a 30? internal pullup to v cc . 910 uvout4 active-low undervoltage output 4. when the voltage at uvin4 falls below its threshold, uvout4 asserts low and stays asserted until the voltage at uvin4 exceeds its threshold. the open-drain output has a 30? internal pullup to v cc . 10 11 ovout4 active-low overvoltage output 4. when the voltage at ovin4 rises above its threshold, ovout4 asserts low and stays asserted until the voltage at ovin4 falls below its threshold. the open-drain output has a 30? internal pullup to v cc . 11 14 margin active-low margin enable input. pull margin low to deassert all outputs (go into high state) regardless of the voltage at any monitored input. 12 15 ovout2 active-low overvoltage output 2. when the voltage at ovin2 rises above its threshold, ovout2 asserts low and stays asserted until the voltage at ovin2 falls below its threshold. the open-drain output has a 30? internal pullup to v cc .
max16008/max16009 low-voltage, high-accuracy, quad window voltage detectors in thin qfn _______________________________________________________________________________________ 7 pin description (continued) pin max16008 max16009 name function 13 16 uvout2 active-low undervoltage output 2. when the voltage at uvin2 falls below its threshold, uvout2 asserts low and stays asserted until the voltage at uvin2 exceeds its threshold. the open-drain output has a 30? internal pullup to v cc . 14 17 ovout1 active-low overvoltage output 1. when the voltage at ovin1 rises above its threshold, ovout1 asserts low and stays asserted until the voltage at ovin1 falls below its threshold. the open-drain output has a 30? internal pullup to v cc . 15 18 uvout1 active-low undervoltage output 1. when the voltage at uvin1 falls below its threshold, uvout1 asserts low and stays asserted until the voltage at uvin1 exceeds its threshold. the open-drain output has a 30? internal pullup to v cc . 16 20 uvin1 undervoltage threshold input 1. when the voltage on uvin1 falls below its threshold, uvout1 asserts low. 17 21 ovin1 overvoltage threshold input 1. when the voltage on ovin1 rises above its threshold, ovout1 asserts low. 18 22 uvin2 undervoltage threshold input 2. when the voltages on uvin2 falls below its threshold, uvout2 asserts low. 19 23 ovin2 overvoltage threshold input 2. when the voltage on ovin2 rises above its threshold, ovout2 asserts low. 5 n.c. not internally connected ?2 mr active-low manual reset input. pull mr low to assert reset low. reset remains low for the reset timeout period after mr is deasserted. mr is pulled up to v cc through a 20k resistor. 13 srt set reset timeout input. connect a capacitor from srt to gnd to set the reset timeout period. the reset timeout period can be calculated as follows: reset timeout (s) = 2.06 x 10 6 ( ) x c srt (f). do not set the reset timeout period to more than 1.12s. for the internal timeout period of 140ms (min), connect srt to v cc . ?9 reset active-low reset output. reset asserts low when the voltage on any of the uvin_ inputs falls below their respective thresholds, the voltage on any of the ovin_ inputs goes above its respective threshold, or mr is asserted. reset remains asserted for at least the minimum reset timeout after all monitored uvin_ inputs exceed their respective thresholds, all ovin_ inputs fall below their respective thresholds, and mr is deasserted. this open-drain output has a 30? internal pullup. ep exposed pad. ep is internally connected to gnd. connect ep to the ground plane to provide a low thermal resistance path from the ic junction to the pc board. do not use as the only electrical connection to gnd.
max16008/max16009 low-voltage, high-accuracy, quad window voltage detectors in thin qfn 8 _______________________________________________________________________________________ max16008/ max16009 reference undervoltage lockout v cc uvin1 margin ( ) max16009 only ovin1 uvin2 ovin2 v cc reset circuit output driver (mr) (srt) timing v cc v cc uvin3 ovin3 uvin4 ovin4 uvout1 (reset) ovout1 uvout2 ovout4 v cc ovout2 uvout3 ovout3 uvout4 figure 1. functional diagram
max16008/max16009 low-voltage, high-accuracy, quad window voltage detectors in thin qfn _______________________________________________________________________________________ 9 detailed description the max16008/max16009 are adjustable quad win- dow voltage detectors in a small thin qfn package. these devices are designed to provide a higher level of system reliability by monitoring multiple supply voltages and providing a fault signal when any of the voltages exceeds its overvoltage threshold or falls below its undervoltage threshold. these devices offer user-adjustable thresholds that allow voltages to be monitored down to 0.4v. the devices allow the upper and lower trip thresholds of each window detector to be set externally with the use of three external resistors. each monitored threshold has an independent open- drain output for signaling a fault condition. the outputs can be wire or?d together to provide a single fault output. the open-drain outputs are internally pulled up with a 30? current, but can be externally driven to other voltage levels for interfacing to other logic levels. both devices feature a margin input to disable the out- puts during margin testing or any other time after power-up operations. the max16009 offers a reset out- put that deasserts after a reset timeout period after all voltages are within their threshold specification. the reset timeout is internally set to 140ms (min), but can be externally adjusted to other reset timeouts using an external capacitor. in addition, the max16009 offers a manual reset input. applications information voltage monitoring the max16008/max16009 feature undervoltage and overvoltage comparators for window detection (see figure 2). uvout_ / ovout_ deassert high when the monitored voltage is within the ?elected window. when the monitored voltage falls below the lower limit of the window (v triplow ), uvout_ asserts low; or if the monitored voltage exceeds the upper limit (v triphigh ), ovout_ asserts low. the application in figure 2 shows the max16008/max16009 enabling the dc-dc converter when the monitored voltage is in the selected window. the resistor values r1, r2, and r3 can be calculated as shown: where r total = r1 + r2 + r3. use the following steps to determine the values for r1, r2, and r3: 1) choose a value for r total , the sum of r1, r2, and r3. because the max16008/max16009 have very low input bias current (2na typ), r total can be up to 2m . large-value resistors help minimize power consumption. lower-value resistors can be used to maintain overall accuracy. vv r rr vv r r triplow th total triphigh th total = + ? ? ? ? ? ? = ? ? ? ? ? ? 23 3 v cc +5v in gnd uvin_ ovin_ en out r1 r2 r3 dc-dc regulator uvout_ ovout_ max16008/ max16009 figure 2. max16008/max16009 monitor circuit
max16008/max16009 low-voltage, high-accuracy, quad window voltage detectors in thin qfn 10 ______________________________________________________________________________________ use the following formulas to calculate the error: where e uv and e ov are the undervoltage and over- voltage error (in %), respectively. 2) calculate r3 based on r total and the desired upper trip point: 3) calculate r2 based on r total , r3, and the desired lower trip point: 4) calculate r1 based on r total , r3, and r2: overvoltage shutdown the max16008/max16009 are ideal for overvoltage- shutdown applications. figure 3 shows a typical circuit for this application using a pass p-channel mosfet. the max16008/max16009 are powered directly from the system voltage supply. select r1 and r2 to set the trip voltage. when the supply voltage remains below the selected threshold, a low logic level on uvout_ turns on the p-channel mosfet. in the case of an overvolt- age event, uvout_ goes high turning off the mosfet, and shuts down the power to the load. figure 4 shows a similar application using a fuse and a silicon-controlled rectifier (scr). an overvoltage event turns on the scr and shorts the supply to ground. the surge of current through the short circuit blows the fuse and terminates the current to the load. select r3 so that the gate of the scr is properly biased when uvout_ goes high. unused inputs any unused uvin_ inputs must be connected to v cc , and any unused ovin_ inputs must be connected to gnd. uvout_ / ovout_ outputs uvout_ and ovout_ outputs assert low when uvin_ and ovin_, respectively, drop below or exceed their specified thresholds. the undervoltage/overvoltage out- puts are open-drain with a (30?) internal pullup to v cc . for many applications, no external pullup resistor is required to interface with other logic devices. an external pullup resistor to any voltage up to 5.5v overdrives the internal pullup if interfacing to different logic supply volt- ages. internal circuitry prevents reverse current flow from the external pullup voltage to v cc (figure 5). when choosing the external pullup resistor, the resistance value should be large enough to ensure that the output can sink the necessary current during a logic-low condi- tion and small enough to be able to overdrive the internal pullup current and meet output high specifications rr r r total 123 =?? r vxr v r th total triplow 23 =? r vxr v th total triphigh 3 = e ir rr rr v x e ir xr v x uv ib triplow ov ib triphigh (%) (%) (( )) = + + ? ? ? ? ? ? = + 1 13 23 21 100 2 100 v cc load uvin_ r1 r2 uvout_ max16008/ max16009 gnd r3* v supply *optional. values of 10k and above are recommended. figure 3. overvoltage shutdown circuit (with external pass mosfet) v cc load scr uvin_ r1 r2 r3 uvout_ max16008/ max16009 gnd fuse v supply figure 4. overvoltage shutdown circuit (with scr fuse)
max16008/max16009 low-voltage, high-accuracy, quad window voltage detectors in thin qfn ______________________________________________________________________________________ 11 (v oh ). resistor values of 50k to 200k can generally be used. reset output (max16009 only) reset asserts low when the voltage on any of the uvin_ inputs falls below its respective threshold, the voltage on any of the ovin_ inputs goes above its respective threshold, or mr is asserted. reset remains asserted for the reset timeout period after all monitored uvin_ inputs exceed their respective thresh- olds, all ovin_ inputs fall below their respective thresh- olds, and mr is deasserted (see figure 6). this open-drain output has a 30? internal pullup. reset timeout capacitor the reset timeout period can be adjusted to accommo- date a variety of microprocessor (?) applications from 50? to 1.12s. adjust the reset timeout period (t rp ) by connecting a capacitor (c srt ) between srt and gnd. calculate the reset timeout capacitor as follows: do not use capacitor (c srt ) values higher than 390nf. connect srt to v cc for a factory-programmed reset timeout of 140ms (min). manual reset input ( mr ) (max16009 only) many ?-based products require manual reset capabil- ity, allowing the operator, a test technician, or external logic circuitry to initiate a reset. a logic-low on mr asserts reset low. reset remains asserted while mr is low, and during the reset timeout period (140ms min) after mr returns high. the mr input has an internal 20k pullup resistor to v cc , so it can be left open if it is not used. mr can be driven with ttl or cmos-logic levels, or with open-drain/collector outputs. connect a normally open momentary switch from mr to gnd to create a manual reset function; external debounce cir- cuitry is not required. if mr is driven from long cables or if the device is used in a noisy environment, connect- ing a 0.1? capacitor from mr to gnd provides addi- tional noise immunity. margin output disable ( margin ) margin allows system-level testing while power sup- plies are adjusted from their nominal voltages. drive margin low to deassert all outputs ( uvout_ , cf ts v i srt rp th srt srt () () _ = ? ? ? ? ? ? max16008/ max16009 gnd v cc gnd reset v cc 5v uvout_ v cc = 3.3v 100k figure 5. interfacing to a different logic supply voltage uvin_ 10% 90% 10% 90% reset uvout_ v th_ + v th_hys t rp t d t d t rd v th_ ovin_ v th_ - v th_hys v th_ 10% 90% ovout_ t d t d figure 6. output timing diagram
pin configurations ovout_ , and reset ) regardless of the voltage at any monitored input. the state of each output does not change while margin = gnd. while margin is low, the ic continues to monitor all voltages. when margin is deasserted, the outputs go to their monitored states after a short propagation delay. the margin input is internally pulled up to v cc . leave unconnected or con- nect to v cc if unused. power-supply bypassing the max16008/max16009 operate from a 2.0v to 5.5v supply. an undervoltage lockout ensures that the out- puts are in the correct states when the uvlo is exceeded. in noisy applications, bypass v cc to ground with a 0.1? capacitor as close to the device as possi- ble. in addition, the additional capacitor improves tran- sient immunity. for fast-rising v cc transients, additional capacitance may be required. 19 20 18 17 7 6 8 ovin3 ovin4 gnd 9 uvin3 ovout1 ovout2 margin uvout1 1 + + 2 uvin2 45 15 14 12 11 ovin2 v cc uvout4 ovout3 uvout3 v cc max16008 uvin4 uvout2 3 13 ovin1 16 10 ovout4 uvin1 tqfn 4mm x 4mm top view 23 24 22 21 8 7 9 ovin3 ovin4 n.c. gnd 10 uvin3 ovout1 ovout2 margin uvout1 srt 12 uvin2 456 17 18 16 14 13 ovin2 v cc uvout4 ovout3 uvout3 v cc max16009 uvin4 uvout2 3 15 ovin1 20 11 ovout4 uvin1 19 12 mr reset tqfn 4mm x 4mm top view max16008/max16009 low-voltage, high-accuracy, quad window voltage detectors in thin qfn 12 ______________________________________________________________________________________ selector guide part number of monitored levels undervoltage/ overvoltage thresholds reset adjustable reset timeout mr max16008 4 adjustable max16009 4 adjustable ??? package information for the latest package outline information and land patterns (footprints), go to www.maxim-ic.com/packages . note that a ?? ?? or ??in the package code indicates rohs status only. package drawings may show a different suffix character, but the drawing per - tains to the package regardless of rohs status. package type package code outline no. land pattern no. 20 tqfn-ep t2044+3 21-0139 90-0037 24 tqfn-ep t2444+4 21-0139 90-0022
max16008/max16009 low-voltage, high-accuracy, quad window voltage detectors in thin qfn 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 2011 maxim integrated products maxim is a registered trademark of maxim integrated products, inc. revision history revision number revision date description pages changed 0 10/05 initial release 1 1/11 added soldering temperature in the absolute maximum rating section and added symbol in electrical characteristics table 2

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