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ltc2935 1 2935fa typical application features applications description ultra-low power supervisor with power-fail output, selectable thresholds the ltc ? 2935 ultra-low power voltage monitor provides system initialization, power-fail warning and reset gen- eration functions. low quiescent current (500na typical) makes the ltc2935 an ideal choice for battery-operated applications. three binary threshold-select inputs con? gure one of eight integrated reset thresholds, ranging from 1.6v to 3.45v in pre-determined increments. early warning of an impending low voltage condition is provided at the power- fail output ( pfo ), whose threshold is above the con? gured reset threshold. supervisory circuits monitor v cc and pull rst low when v cc drops below the con? gured reset threshold. when v cc is rising from an under-threshold condition, an internal reset timer is started after exceeding the reset threshold by 5%. a 200ms reset timeout delays the return of the rst output to a high state. a pushbut- ton switch connected to the mr input is typically used to force a manual reset. outputs rst and pfo are available with open-drain (ltc2935-1/ltc2935-3) or active pull-up (ltc2935-2/ltc2935-4) circuits. operating temperature range is from C40c to 85c. con? gurable low power voltage monitor n 500na quiescent current n 1.5% (max) accuracy over temperature n integrated precision attenuators n eight pin-selectable reset thresholds n eight pin-selectable power-fail thresholds n early warning power-fail output n 200ms reset timeout n manual reset input n compact 8-lead, 2mm 2mm dfn and tsot-23 (thinsot?) packages n portable equipment n battery-powered equipment n security systems n point-of-sale devices n wireless systems falling threshold selection table v cc v in battery powered system logic 2935 ta01a s2 s1 0.1f pfo rst s0 mr ltc2935-2 gnd ltc2935-1/ltc2935-2 ltc2935-3/ltc2935-4 reset threshold (v) power-fail threshold (v) reset threshold (v) power-fail threshold (v) s2s1s0 3.30 3.45 2.44 2.56 low low low 3.15 3.30 2.32 2.44 low low high 3.00 3.15 2.20 2.32 low high high 2.85 3.00 2.08 2.20 low high low 2.70 2.85 1.96 2.08 high high low 2.55 2.70 1.84 1.96 high low low 2.40 2.55 1.72 1.84 high low high 2.25 2.40 1.60 1.72 high high high l , lt, ltc, ltm, linear technology and the linear logo are registered trademarks of linear technology corporation. thinsot is a trademark of linear technology corporation. all other trademarks are the property of their respective owners.
ltc2935 2 2935fa absolute maximum ratings input voltages v cc ........................................................... C0.3v to 6v s2, s1, s0, mr ......................... C0.3v to (v cc + 0.3v) output voltages ( pfo , rst ) ltc2935-1/ltc2935-3 ............................. C0.3v to 6v ltc2935-2/ltc2935-4 .............. C0.3v to (v cc + 0.3v) rms currents pfo , rst ..........................................................5ma (notes 1, 2) top view v cc mr rst pfo s2 s1 s0 gnd dc package 8-lead (2mm s 2mm) plastic dfn 9 4 1 2 3 6 5 7 8 t jmax = 125c, ja = 102c/w exposed pad (pin 9), pcb gnd connection optional v cc mr rst pfo s2 1 s1 2 s0 3 gnd 4 8 7 6 5 top view ts8 package 8-lead plastic tsot-23 t jmax = 125c, ja = 195c/w pin configuration operating ambient temperature range ltc2935c ................................................ 0c to 70c ltc2935i.............................................. C40c to 85c storage temperature range ................... C65c to 150c lead temperature (soldering, 10 sec) tsot-23 package .............................................. 300c order information lead free finish tape and reel (mini) tape and reel part marking* package description temperature range ltc2935cts8-1#trmpbf ltc2935cts8-1#trpbf ltdpw 8-lead plastic tsot-23 0c to 70c ltc2935its8-1#trmpbf ltc2935its8-1#trpbf ltdpw 8-lead plastic tsot-23 C40c to 85c ltc2935cts8-2#trmpbf ltc2935cts8-2#trpbf ltdqb 8-lead plastic tsot-23 0c to 70c ltc2935its8-2#trmpbf ltc2935its8-2#trpbf ltdqb 8-lead plastic tsot-23 C40c to 85c ltc2935cts8-3#trmpbf ltc2935cts8-3#trpbf ltfhv 8-lead plastic tsot-23 0c to 70c ltc2935its8-3#trmpbf ltc2935its8-3#trpbf ltfhv 8-lead plastic tsot-23 C40c to 85c ltc2935cts8-4#trmpbf ltc2935cts8-4#trpbf ltfhx 8-lead plastic tsot-23 0c to 70c ltc2935its8-4#trmpbf ltc2935its8-4#trpbf ltfhx 8-lead plastic tsot-23 C40c to 85c ltc2935cdc-1#trmpbf ltc2935cdc-1#trpbf ldpx 8-lead (2mm 2mm) plastic dfn 0c to 70c ltc2935idc-1#trmpbf ltc2935idc-1#trpbf ldpx 8-lead (2mm 2mm) plastic dfn C40c to 85c ltc2935cdc-2#trmpbf ltc2935cdc-2#trpbf ldqc 8-lead (2mm 2mm) plastic dfn 0c to 70c ltc2935idc-2#trmpbf ltc2935idc-2#trpbf ldqc 8-lead (2mm 2mm) plastic dfn C40c to 85c ltc2935cdc-3#trmpbf ltc2935cdc-3#trpbf lfhw 8-lead (2mm 2mm) plastic dfn 0c to 70c ltc2935idc-3#trmpbf ltc2935idc-3#trpbf lfhw 8-lead (2mm 2mm) plastic dfn C40c to 85c ltc2935cdc-4#trmpbf ltc2935cdc-4#trpbf lfhy 8-lead (2mm 2mm) plastic dfn 0c to 70c ltc2935idc-4#trmpbf ltc2935idc-4#trpbf lfhy 8-lead (2mm 2mm) plastic dfn C40c to 85c trm = 500 pieces. *temperature grades are identi? ed by a label on the shipping container. consult ltc marketing for parts speci? ed with wider operating temperature ranges. consult ltc marketing for information on lead based ? nish parts. for more information on lead free part marking, go to: http://www.linear.com/leadfree/ for more information on tape and reel speci? cations, go to: http://www.linear.com/tapeandreel/
ltc2935 3 2935fa electrical characteristics symbol parameter conditions min typ max units v cc v cc input supply voltage l 5.5 v i cc v cc input supply current l 225 500 1000 na reset thresholds (ltc2935-1/ltc2935-2) v rtf1 reset threshold 1 (v cc falling) s2 = low : s1 = low : s0 = low l 3.251 3.300 3.349 v v rtf2 reset threshold 2 (v cc falling) s2 = low : s1 = low : s0 = high l 3.103 3.150 3.197 v v rtf3 reset threshold 3 (v cc falling) s2 = low : s1 = high : s0 = high l 2.955 3.000 3.045 v v rtf4 reset threshold 4 (v cc falling) s2 = low : s1 = high : s0 = low l 2.808 2.850 2.892 v v rtf5 reset threshold 5 (v cc falling) s2 = high : s1 = high : s0 = low l 2.660 2.700 2.740 v v rtf6 reset threshold 6 (v cc falling) s2 = high : s1 = low : s0 = low l 2.512 2.550 2.588 v v rtf7 reset threshold 7 (v cc falling) s2 = high : s1 = low : s0 = high l 2.364 2.400 2.436 v v rtf8 reset threshold 8 (v cc falling) s2 = high : s1 = high : s0 = high l 2.217 2.250 2.283 v v rtf reset threshold differential v rtf(n+1) C v rtf(n) (note 3) l 142 150 158 mv v rt(hyst) reset threshold hysteresis (v cc rising) relative to any selected reset threshold l 4.5 5 6 % t uvr undervoltage detect to rst falling v cc below threshold by 1% (note 3) 1 ms reset thresholds (ltc2935-3/ltc2935-4) v rtf1 reset threshold 1 (v cc falling) s2 = low : s1 = low : s0 = low l 2.404 2.440 2.476 v v rtf2 reset threshold 2 (v cc falling) s2 = low : s1 = low : s0 = high l 2.286 2.320 2.354 v v rtf3 reset threshold 3 (v cc falling) s2 = low : s1 = high : s0 = high l 2.167 2.200 2.233 v v rtf4 reset threshold 4 (v cc falling) s2 = low : s1 = high : s0 = low l 2.049 2.080 2.111 v v rtf5 reset threshold 5 (v cc falling) s2 = high : s1 = high : s0 = low l 1.931 1.960 1.989 v v rtf6 reset threshold 6 (v cc falling) s2 = high : s1 = low : s0 = low l 1.813 1.840 1.867 v v rtf7 reset threshold 7 (v cc falling) s2 = high : s1 = low : s0 = high l 1.695 1.720 1.745 v v rtf8 reset threshold 8 (v cc falling) s2 = high : s1 = high : s0 = high l 1.576 1.600 1.624 v v rtf reset threshold differential v rtf(n+1) C v rtf(n) (note 3) l 112 120 128 mv v rt(hyst) reset threshold hysteresis (v cc rising) relative to any selected reset threshold l 4.5 5 6 % t uvr undervoltage detect to rst falling v cc below threshold by 1% (note 3) 1 ms power-fail thresholds (ltc2935-1/ltc2935-2) v pft power-fail threshold differential v pft(n) C v rtf(n) any selected reset threshold (v cc falling) l 100 150 200 mv v pft(hyst) power-fail threshold hysteresis relative to any selected power-fail threshold (v cc rising) l 2 2.5 3.5 % t uvp undervoltage detect to pfo falling v cc below threshold by 1% (note 3) 1 ms power-fail thresholds (ltc2935-3/ltc2935-4) v pft power-fail threshold differential v pft(n) C v rtf(n) any selected reset threshold (v cc falling) l 70 120 170 mv v pft(hyst) power-fail threshold hysteresis relative to any selected power-fail threshold (v cc rising) l 2 2.5 3 % t uvp undervoltage detect to pfo falling v cc below threshold by 1% (note 3) 1 ms control inputs: mr , s2, s1, s0 v in(th) control input threshold s2, s1, s0 mr l l 0.3 ? v cc 0.4 0.7 ? v cc 1.4 v v t pw input pulse width mr l 20 s t pd propagation delay to rst falling manual reset falling l 2520 s r pu internal pull-up resistance mr l 600 900 1200 k i lk input leakage current s2, s1, s0 = v cc or gnd l 1 10 na the l denotes the speci? cations which apply over the full operating temperature range, otherwise speci? cations are at t a = 25c, v cc = 3.6v, unless otherwise noted. (note 2)
ltc2935 4 2935fa typical performance characteristics supply current vs supply voltage normalized reset and power-fail thresholds vs temperature comparator undervoltage glitch immunity reset timeout period vs temperature voltage output low vs pull-up current ( rst , pfo ) voltage output high vs pull-down current ( rst , pfo ) v cc (v) 0 0 i cc (na) 200 400 600 800 1000 1 234 2935 g01 56 C40c 25c 85c s0 = s1 = s2 = gnd temperature (c) C50 0.985 normalized threshold (v/ v) 0.990 0.995 1.000 1.005 1.015 C25 02550 2935 g02 75 100 1.010 comparator overdrive (%) 0.1 2.0 glitch duration, t uv (ms) 2.5 1 10 100 1.5 1.0 0.5 0 3.0 2935 g03 v cc = 3.6v comparators pull down above curve temperature (c) C50 140 t rst (ms) 160 180 200 220 260 C25 02550 2935 g04 75 100 240 v cc = 3.6v pull-up current (ma) 0 0 v ol (mv) 20 40 60 80 100 1 234 2935 g05 5 C40c 25c 85c v cc = 3v pull-down current (ma) 0 3.2 v oh (mv) 3.3 3.4 3.5 3.6 C0.2 C0.4 C0.6 C0.8 2935 g06 C1 C40c 25c 85c ltc2935-2 v cc = 3.6v t a = 25c, unless otherwise noted. electrical characteristics symbol parameter conditions min typ max units reset and power-fail outputs: rst , pfo v ol voltage output low v cc = 1v, 200a pull-up current v cc = 3v, 3ma pull-up current s2, s1, s0 = low l l 25 50 100 150 mv mv v oh voltage output high (ltc2935-2) C200a pull-down current l 0.7 ? v cc v i oh current output high, leakage (ltc2935-1) v rst , v pfo = 3.6v l 1 10 na t rst reset timeout period l 140 200 260 ms the l denotes the speci? cations which apply over the full operating temperature range, otherwise speci? cations are at t a = 25c, v cc = 3.6v, unless otherwise noted. (note 2) 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. all currents into pins are positive, all voltages are referenced to gnd unless otherwise noted. note 3. guaranteed by design. characterized, but not production tested.
ltc2935 5 2935fa supply current vs s0, s1, s2 input voltage supply current vs mr input voltage pin functions exposed pad (dfn only): exposed pad may be left ? oating or connected to device ground. gnd: device ground. mr : manual reset input. attach a pushbutton switch between this input and ground. a logic low on this input pulls rst low. when the mr input returns to logic high, rst returns high after 200ms. tie to v cc if unused. pfo : power-fail output. pfo pulls low when v cc falls below the power-fail threshold. the power-fail thresh- old is above the con? gured falling reset threshold by a pre-determined margin. pfo is released when v cc rises above the power-fail threshold by 2.5%. pfo is available with open-drain (ltc2935-1/ltc2935-3) or active pull-up (ltc2935-2/ltc2935-4) outputs. leave open if unused. rst : reset output. rst pulls low when v cc falls below the reset threshold. rst is released 200ms after v cc exceeds the reset threshold plus 5% hysteresis. rst is available with open-drain (ltc2935-1/ltc2935-3) or active pull-up (ltc2935-2/ltc2935-4) outputs. leave open if unused. s2, s1, s0: threshold selection inputs. tie to gnd or v cc for required reset threshold. see the falling threshold selection table on page 1 for settings. v cc : power supply and monitored voltage input. bypass v cc with a 0.1f capacitor to gnd. typical performance characteristics s0, s1, s2 input voltage (v) 0 i cc (a) 200 3.5 150 100 12 0.5 1.5 2.5 3 4 50 0 250 2935 g07 v cc = 3.6v mr input voltage (v) 0 i cc (a) 4 3.5 3 2 12 0.5 1.5 2.5 3 4 1 0 5 2935 g08 v cc = 3.6v t a = 25c, unless otherwise noted.
ltc2935 6 2935fa block diagram timing diagram 900k ltc2935-2/ltc2935-4 v cc 2935 bd rc v cc rst pfo ? + pc ? + 0.4v reset delay ltc2935-2/ltc2935-4 v cc gnd mr s0 s1 s2 v rtf v pft t rst 2935 td v cc rst pfo mr t rst t pd
ltc2935 7 2935fa applications information voltage monitoring unmanaged power can cause various system problems. at power-up, voltage ? uctuation around critical thresholds can cause improper system or processor initialization. the ltc2935 provides power management capabilities for the system power-up phase. the supervisory device issues a system reset after the monitored voltage has stabilized. built-in hysteresis and ? ltering ensures that ? uctuations due to load transients or supply noise do not cause chattering of the status outputs. comparator undervoltage glitch immunity is shown in the typical performance characteristics section. the curve dem- onstrates the transient amplitude and width required to switch the comparators. because many batteries exhibit large series resistance, load currents can cause signi? cant voltage drops. the low dc current draw of the ltc2935 (at any input volt- age) does not add to the loading problem. when voltage is initially applied to v cc , rst and pfo pull low once there is enough voltage to turn on the pull-down devices (1v maximum). if the monitored supply voltage falls to the power-fail threshold, the built-in power-fail comparator pulls pfo low. at this point, there remains a voltage margin before the rst output pulls low. pfo remains low until v cc rises above the power-fail threshold plus 2.5% hysteresis. pfo is typically used in signal preparation for controlled shut- down. for example, the pfo output may be connected to a processor nonmaskable interrupt. upon interrupt, the processor may begin shutdown procedures. shutdown events may include supply sequencing and/or storage/ erasure of system state in nonvolatile memory. if the monitored voltage drops below the reset threshold, rst pulls low until v cc rises above the reset threshold plus 5% hysteresis. this may occur through battery charging or replacement. an internal reset timer delays the return of the rst output to a high state to provide settling and initialization time. the rst output is typically connected to a processor reset input. few, if any external components are necessary for reliable operation. however, a decoupling capacitor between v cc and ground is recommended (0.01f minimum). threshold con? guration the ltc2935 monitors and compares the v cc voltage against two internal thresholds during operation. the higher threshold (power-fail) is the level used for early warning of a low voltage condition, reported on the pfo output. the lower threshold (reset) is the level at which the rst output pulls low. use system requirements to choose the appropriate reset threshold from table 1. table 1. falling threshold selection ltc2935-1/ltc2935-2 ltc2935-3/ltc2935-4 reset threshold (v) power-fail threshold (v) reset threshold (v) power-fail threshold (v) s2 s1 s0 3.30 3.45 2.44 2.56 low low low 3.15 3.30 2.32 2.44 low low high 3.00 3.15 2.20 2.32 low high high 2.85 3.00 2.08 2.20 low high low 2.70 2.85 1.96 2.08 high high low 2.55 2.70 1.84 1.96 high low low 2.40 2.55 1.72 1.84 high low high 2.25 2.40 1.60 1.72 high high high in the ltc2935-1/ltc2935-2 the power-fail threshold is always 150mv higher than the con? gured reset threshold. in the ltc2935-3/ltc2935-4 the power-fail threshold is always 120mv higher than the con? gured reset threshold. set the threshold selection inputs (s2, s1, s0) accordingly.
ltc2935 8 2935fa applications information figure 1. rst vs v cc with 10k pull-up selecting output logic style the ltc2935 status outputs are available in two op- tions: open-drain (ltc2935-1/ltc2935-3) or active pull-up (ltc2935-2/ltc2935-4). the open-drain options (ltc2935-1/ltc2935-3) allow the outputs to be pulled up to a user de? ned voltage with a resistor. the open-drain pull-up voltage may be greater than v cc (5.5v maximum), which is not always possible with inferior battery supervi- sors, due to internal clamps. when the status outputs are low, power is dissipated in the pull-up resistors. recom- mended resistor values lie in the range between 10k and 470k. figure 1 demonstrates typical ltc2935-1/ltc2935-3 rst output behavior. the active pull-up options (ltc2935-2/ltc2935-4) elimi- nate the need for external pull-up resistors on the status outputs. integrated pull-up devices pull the outputs up to v cc . actively pulled up outputs may not be driven above v cc . some applications require the rst and/or pfo outputs to be valid with v cc down to ground. active pull-up handles this requirement with the addition of an external resistor from the output to ground. the resistor provides a path for leakage currents, preventing the output from ? oating to undetermined voltages when connected to high impedance (such as cmos logic inputs). the resistor value should be small enough to provide effective pull-down without excessively loading the pull-up circuitry. a 100k resistor from output to ground is satisfactory for most applications. when the status outputs are high, power is dissipated in the pull-down resistors. figure 2 demonstrates typical ltc2935-2/ltc2935-4 rst output behavior. manual reset input when v cc is above its reset threshold, and the manual reset input ( mr ) is pulled low, the rst output is forced low. rst remains low for 200ms after the manual reset input is released and pulled high. the manual reset input is pulled up internally through 900k to v cc . if external leakage cur- rents have the ability to pull down the manual reset input below its logic threshold, a lower value pull-up resistor, placed between v cc and mr will ? x the problem. input mr is often pulled down through a pushbutton switch requiring human contact. if extended esd toler- ance is required, series resistance between the switch and the input is recommended. for most applications, a 10k resistor provides suf? cient current limiting. figure 2. rst vs v cc v cc (v) 0 rst (v) 2.0 2.5 3.0 1.5 1.0 12 0.5 1.5 2.5 3 3.5 0.5 0 3.5 2935 f01 ltc2935-1 s2 = gnd s1 = s0 = v cc v cc (v) 0 rst (v) 2.0 2.5 3.0 1.5 1.0 12 0.5 1.5 2.5 3 3.5 0.5 0 3.5 2935 f02 ltc2935-2 s2 = gnd s1 = s0 = v cc
ltc2935 9 2935fa typical applications battery monitor with interface to low voltage logic alkaline cell stack voltage monitor coin cell voltage monitor 1.18m 1f 590k 100k 100k v cc v dd p power fail falling threshold = 3.15v reset falling threshold = 3.00v manual reset pushbutton *optional resistor for added esd protection 2935 ta02 nmi rst s0 s1 li-ion 0.1f shdn in out 3a ldo 1.8v adj pfo pb1 rst s2 mr ltc2935-1 lt3009 r esd * 10k gnd gnd + v cc 2935 ta03 s0 s2 1.5v 0.1f low battery s1 ltc2935-2 gnd + 1.5v + 1.5v + rst pfo mr power fail fail threshold = 2.55v reset threshold = 2.40v system reset v cc 2935 ta04 s2 s1 cr2032 0.1f pfo rst s0 mr ltc2935-2 gnd + power fail fail threshold = 2.70v reset threshold = 2.55v low battery system reset
ltc2935 10 2935fa 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 package description dc package 8-lead plastic dfn (2mm 2mm) (reference ltc dwg # 05-08-1719 rev ?)
ltc2935 11 2935fa 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. 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 ts8 package 8-lead plastic tsot-23 (reference ltc dwg # 05-08-1637)
ltc2935 12 2935fa linear technology corporation 1630 mccarthy blvd., milpitas, ca 95035-7417 (408) 432-1900 fax: (408) 434-0507 www.linear.com ? linear technology corporation 2008 lt 0609 rev a ? printed in usa related parts typical application part number description comments ltc690 5v supply monitor, watchdog timer and battery backup 4.65v threshold ltc694-3.3 3.3v supply monitor, watchdog timer and battery backup 2.9v threshold ltc1232 5v supply monitor, watchdog timer and pushbutton reset 4.37v/4.62v threshold ltc1326 micropower triple supply monitor for 5v/2.5v, 3.3v and adj 4.725v, 3.118v, 1v threshold (0.75%) and adj ltc1726 micropower triple supply monitor for 2.5v/5v, 3.3v and adj adjustable reset and watchdog timeouts ltc1727 micropower triple supply monitor with open-drain reset individual monitor outputs in msop ltc1728 micropower triple supply monitor with open-drain reset 5-lead sot-23 package ltc1985 micropower triple supply monitor with push-pull reset output 5-lead sot-23 package ltc2900 programmable quad supply monitor adjustable reset, 10-lead msop and dfn packages ltc2901 programmable quad supply monitor adjustable reset and watchdog timer ltc2902 programmable quad supply monitor adjustable reset and tolerance ltc2903 precision quad supply monitor 6-lead sot-23 package ltc2904/ltc2905/ ltc2906/ltc2907 three-state programmable precision dual supply monitor 8-lead sot-23 and dfn packages ltc2908 precision six-supply monitor (four fixed and two adjustable) 8-lead tsot-23 and dfn packages ltc2909 precision triple/dual input uv, ov and negative voltage monitor shunt regulated v cc pin, adjustable threshold and reset, 8-lead sot-23 and dfn packages ltc2910 octal positive/negative voltage monitor separate v cc pin, eight inputs, up to two negative monitors adjustable reset timer, 16-lead ssop and dfn packages ltc2912/ltc2913/ ltc2914 single/dual/quad uv and ov voltage monitors separate v cc pin, adjustable reset timer ltc2915/ltc2916/ ltc2917/ltc2918 single voltage supervisors with 27 pin-selectable thresholds manual reset and watchdog functions ltc2934 ultralow power supervisor with power-fail output 500na quiescent current, 2mm 2mm 8-lead dfn and tsot-23 packages, adjustable via external resistors portable device battery monitor 1.18m 1f 590k 100k 100k v cc low battery early warning 2935 ta05 s0 s1 li-ion 0.1f shdn in out 3a ldo 1.8v adj pfo rst s2 mr ltc2935-1 lt3009 gnd gnd + power fail falling threshold = 3.15v reset falling threshold = 3.00v

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